Alaska Geobotany Center, Director

• Summary
• Curriculum Vita
• Phone 907.474.2460
• Email

Curriculum Vitae

CV - Contracts and Grants

Publications

• Major maps, atlas, and edited publications
• Peer-reviewed book chapters:
• Peer-reviewed articles
• Refereed government reports, maps, and published abstracts in proceedings volumes
• Book reviews
• Unpublished papers and posters presented at conferences and workshops (* invited)
• Other reports and maps to government agencies and consulting firms
• Theses

Major maps, atlas, and edited publications:

Raynolds, M.,K., D.A. Walker, H.A. Maier. 2006. Alaska Arctic Tundra Vegetation Map. Scale 1:4,000,000 Conservation of Arctic Flora and Fauna (CAFF) Map No. 2. US Fish and Wildlife Service, Anchorage, AK.

Daniels, F..J.A., A. Elvebakk, S.S. Talbot, D.A. Walker. 2005. Classification and Mapping of Arctic Vegetation: A Tribute to Boris Yurtsev. A selection of contributions, presented at the Second International Workshop on Circumpolar Vegetation Classification and Mapping, Troms�, Sommar�ya, Norway, 2-6 June 2004. Phytocoenologia, 35 (4): 715-1079.

CAVM Team (D. Walker, (project director), W.A. Gould, L.C. Blliss, S.A. Edlund, M.K. Raynolds, S.C. Zoltai, F.J.A. Dani�ls, C. Bay, M. Wilhelm, E. Einarsson, G. Gundjonsson, A. Elvebakk, B.E. Johansen, F.V. Ananjeva, D.S. Drozedov, A.E. Katenin, S.S. Kholod, L.A. Konchenko, Y.V. Korostelev, E.S. Melnikov, N.G. Moskalenko, A.N. Polezhaev, O.E. Ponomareva, E.B. Pospelova, I.N. Safronova, R.P. Shelkunova, B.A. Yurtsev, M.D. Fleming, C.J. Markon, D.F. Murray, and S.S. Talbot). 2003. Circumpolar Arctic Vegetation Map. Scale 1:7,500,000. Conservation of Arctic Flora and Fauna (CAFF) Map No. 1. U.S. Fish and Wildlife Service, Anchorage, Alaska.

National Research Council, Committee on Cumulative Environmental Effects of Oil and Gas Activities on Alaska's North Slope (Orians, G., T. Albert,, G. Brown, R. Cameron,, P. Cochran, S.C. Gerlach, G. Gryc, D. Hite, M. Kennicott, A. Lachenbruch,, L. Lowry, J. Sedinger, L. Speer, D. Walker,). 2003. Cumulative Environmental Effects of Oil and Gas Activities on Alaska's North Slope. National Academies Press, Washington, D.C. 288 pp.

Hamilton, T. D. 2003. Glacial Geology of Toolik Lake and the Upper Kuparuk River Region. D.A. Walker (ed.). Biological Papers of the University of Alaska. No. 26. University of Alaska Printing Services, Fairbanks, AK.

Jones, H.G., J. Pomeroy, D.A. Walker, and R. Hoham (eds.) 2001. Snow Ecology. Cambridge: Cambridge University Press.

Walker, D.A., K.R. Everett, P.J. Webber, and J. Brown. 1980. Geobotanical Atlas of the Prudhoe Bay Region, Alaska. U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. CRREL Report 80-14.

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Peer-reviewed book chapters:

Walker, D.A., T. D. Hamilton, M. D. Walker, A. Balsar, H. Maier, C. Munger, and N. A. Auerbach. 2006 submitted. Vegetation of the Toolik Lake region in relationship to glacial geology. in J. Hobbie, ed. Toolik Lake LTER Book.

Walker, D.A., J.G. Molenaar, and W.D. Billings. 2001. Snow-vegetation interactions in tundra environments. In: Jones, H.G., J. Pomeroy, D.A. Walker, and R. Hoham (eds.) Snow Ecology. Cambridge: Cambridge University Press, pp. 264-322.

Walker, M.D., D.A. Walker, T. Theodose, and P.J. Webber. Vegetation : Hierarchical environmental species relationships. 2001. In: Bowman, W. and T.R. Seastedt (eds.), Niwot Ridge, an Alpine Ecosystem. Cambridge University Press, 99-127.

Bockheim, J.G., D.A. Walker, and L.R. Everett. 1997. Soil carbon distribution in nonacidic and acidic tundra of Arctic Alaska. In: Lal, R., J.M. Kimble, R.F. Follett, and B.A. Stewart (eds.). Soil Processes and the Carbon Cycle. Boca Raton, Fla.: CRC Press, pp. 143-155.

Walker, D.A., 1997. Arctic Alaskan vegetation disturbance and recovery: a hierarchical approach to the issue of cumulative impacts. In: Crawford, R. M. M. (ed.) Disturbance and recovery in Arctic lands: an ecological perspective. Dordrecht, the Netherlands: Kluwer Academic Publishers, pp 457-480.

Walker, D.A., 1996. Disturbance and recovery arctic Alaskan vegetation. In: J.F. Reynolds and J.D. Tenhunen (Eds.) Landscape function and disturbance in arctic tundra. Ecological Studies, Vol. 120. Berlin Heidelberg: Springer-Verlag, pp. 35-71.

Walker, D.A., and M.D. Walker. 1996 Terrain and vegetation of the Imnavait Creek watershed. In: J.F. Reynolds and J.D. Tenhunen (Eds.) Landscape function and disturbance in arctic tundra. Ecological Studies, Vol. 120. Berlin Heidelberg: Springer-Verlag, pp. 73-108.

Duguay, C.R. and D.A. Walker. 1996. Environmental modeling and monitoring with GIS:Niwot Long-Term Ecological Research site. In: Goodchild, M.F., L.T. Steyaert, B.O. Parks, C.A. Johnston, D.R. Maidment, M. Crane, and S. Glendinning (eds.). GIS and Environmental Modeling:Progress and Research Issues. Ft. Collins, CO: GIS World, Inc. Chap. 41, pp. 219-223.

Walker, D.A., 1981. Prudhoe Bay, Alaska. In: Bliss, L.C., O.W. Heal and J.J. Moore (eds.), Tundra ecosystems: a comparative analysis. Cambridge University Press, p. 766-767.

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Peer-reviewed articles:

Daanen, R., V. Romanovsky, D. Walker, M. Lacouceur. 2008 in press. High resolution surface and subsurface survey of a nonsorted circle system. Proceedings of the Ninth International Conference on Permafrost, Fairbanks, AK, 29 Jun-3 Jul 2008, pp. ____.

Munger, C. A., D.A. Walker, H.A. Maier, and T.D. Hamilton. 2008 in press. Spatial analysis of glacial geology, surficial geomorphology, and vegetation in the Toolik Lake region: relevance to past and future land-cover changes, Proceedings of the Ninth International Conference on Permafrost, Fairbanks, AK, 29 Jun-3 Jul 2008, pp. ____.

Walker, D.A., H.A. Maier, E.M. Barbour. 2008 in press. A web-based arctic geobotanical atlas and a new hierarchy of maps of the Toolik Lake Region, Alaska, Proceedings of the Ninth International Conference on Permafrost, Fairbanks, AK, 29 Jun-3 Jul 2008, pp. ___.

Richter-Menge, J., Overland, J., Proshutinsky, A., Romanovsky, V., Bengtsson, L., Brigham, L., Dyurgerov, M., Gascard, J.C., Gerland, S., Graversen, R., Hass, C., Karcher, M., Kuhry, P., Maslanik, J., Melling, H., Maslowski, W., Morison, J., Perovich, D., Przybylak, R., Rachold, V., Rigor, I., Shiklomanov, A., Stoeve, J., Walker, D., Walsh, J. 2006. State of the Arctic Report, 36 pp, NOAA/OAR/PMEL, Seattle, WA.

Walker, D.A., H. E. Epstein, W. A. Gould, C. L. Ping, V. E. Romanovsky, Y. Shur, C. T. Tarnocai, R. P. Daanen, G. Gonzalez, A. N. Kade, A. M. Kelley, W. B. Drantz, P. Kuss, N. V. Matveyeva, G. J. Miochaelson, C. A. Munger, D. J. Nickolsky, R. A. Peterson, M. K. Raynolds, and C. M. Vonlanthen. 2007 submitted. Biocomplexity of small patterned-ground features along the North American Arctic Transect. Journal of Geophysical Research � Biogeosciences.

Gould, W. A., G. Gonzalez, D.A. Walker, C. Ping. (2007 submitted), Integrating ecological research, education, and traditional ecological knowledge in a study of biocomplexity in the Arctic. Frontiers of Ecology.

Kade, A. and D.A. Walker. 2008 in press. Experimental alteration of vegetation on nonsorted circles: effects on cryogenic activity and implications for climate change in the Arctic. Arctic, Antarctic and Alpine Research.

Kade, A., V.E. Romanovsky, and D.A. Walker. 2006. The n-factor of nonsorted circles along a climate gradient in Arctic Alaska. Permafrost and Periglacial Processes, 17: 1-11.

Raynolds, M.K., D.A. Walker, and H.A. Maier. 2006. NDVI patterns and phytomass dirtribution in the circumpolar Arctic. Remote Sensing of the Environment, 102: 271-281.

Jia, G. J., H. E. Epstein, and D. A. Walker. 2006. Spatial heterogeneity of tundra vegetation response to recent temperature changes. Global Change Biology, 42-55.

Raynolds, M.K., D.A. Walker, H.A. Maier. 2005. Plant community-level mapping of arctic Alaska based on the Circumpolar Arctic Vegetation Map. Phytocoenologia, 35: 821-848.

Kade, A., D.A. Walker, and M.K. Raynolds. 2005. Plant communities and soils in cryoturbated tundra along a bioclimate gradient in the Low Arctic, Alaska. Phytocoenologia, 35: 761-820.

Walker, D.A., A. Elvebakk, S.S. Talbot, F.J.A. Daniels. 2005. The Second International Workshop on circumpolar Vegetation Classification and Mapping: a tribute to Boris Yurtsev. Phytocoenologia, 715-725.

Zhurbenko, M.P. G.P. Laursen, and D.A. Walker. 2005. New and rare lichenicolous fungi and lichens from the North American Arctic. Mycotaxon, 92: 201-212.

Walker, D.A., M.K. Raynolds, F.J.A. Daniels, E. Einarsson, A. Elvebakk, W.A. Gould, A.E. Katenin, S.S. Kholod, C.J. Markon, E.S. Melnikov, N.G. Moskalenko. S.S. Talbot, B.A. Yurtsev, and the CAVM Team. 2005. The Circumpolar Arctic Vegetation Map. Journal of Vegetation Science, 16: 267-282.

Chapin III, F. S., M. Sturm, M. C. Serreze, J. P. McFadden, J. R. Key, A. H. Lloyd, A. D. McGuire, T. S. Rupp, A. H. Lynch, J. P. Schimel, J. Beringer, W. L. Chapman, H. E. Epstein, E. S. Euskirchen, L. D. Hinzman, G. Jia, C. L. Ping, K. D. Tape, C. D. C. Thompson, D. A. Walker, and J. M. Welker. 2005. Role of land-surface changes in arctic summer warming. Science . 310: 657-660.

Hinzman, Larry D. Neil D. Bettez, W. Robert Bolton, F. Stuart Chapin, Mark B. Dyurgerov, Chris L. Fastie, Brad Griffith, Robert D. Hollister, Allen Hope, Henry P. Huntington, Anne M. Jensen, Gensuo J. Jia, Torre Jorgenson, Douglas L. Kane, David R. Klein, Gary Kofinas, Amanda H. Lynch, Andrea H. Lloyd, A. David McGuire, Frederick E. Nelson, Matt Nolan, Walter C. Oechel, Thomas E. Osterkamp, Charles H. Racine, Vladimir E. Romanovsky, Robert S. Stone, Douglas A. Stow, Matthew Sturm, Craig E. Tweedie, George L. Vourlitis, Marilyn D. Walker, Donald A. Walker, Patrick J. Webber, Jeff Welker, Kevin S. Winker, Kenji Yoshikawa. 2005. Evidence and Implications of Recent Climate Change in Northern Alaska and Other Arctic Regions. Climatic Change, 72(3):251-298.

Riedel, S. M., H. E. Epstein, and D. A. Walker. 2005. Biotic controls over spectral reflectance of arctic tundra vegetation. International Journal of Remote Sensing 26:2391-2405.

Riedel, S. M., H. E. Epstein, D. A. Walker, D.L. Richardson, M.P. Calef, E. Edwards, A. Moody 2005. Spatial and temporal heterogeneity of vegetation properties among four tundra plants communities at Ivotuk, Alaska, U.S.A. Arctic, Antarctic, and Alpine Research, 37: 35-42.

Zhurbenko, M., G. Laursen, and D.A. Walker. 2005. New lichen records for Alaska. The Bryologist, 92:201-212.

Zhurbenko, M.P., M.K. Raynolds, D.A. Walker, and M.V. Matveeva. 2005. Lichens and lichenicolous fungi from the Kolyma delta region, Russian Arctic. Graphis Scripta 17:27-29.

Michaelson, G.J., C.L. Ping, and D.A. Walker. 2004 submitted. Biogeochemistry of soils associated with cryptogamic crusts on frost boils in Arctic Alaska. Arctic, Antarctic, and Alpine Research.

Ping, C.L., G.J. Michaelson, J.M. Kimble, and D.A. Walker. 2005. Soil acidity and exchange properties of cryogenic soils in Arctic Alaska. Soil Science and Plant Nutrition, 51: 649-653.

Epstein, H.E. J. Beringer, W.A. Gould, A.H. Lloyd, C.D. Thompson, F.S. Chapin III, G.J. Michaleson, C.L. Ping, T.S. Rupp, and D.A. Walker. 2004. The nature of spatial transitions in the Arctic. Journal of Biogeography 31: 1917-1933.

Kelley, A.M., H.E. Epstein, and D.A. Walker. 2004. Role of vegetation and climate in permafrost active layer depth in Arctic Alaska and Canada. Journal of Glaciology and Climatology, 26 (supplement): 269-274.

Stow, D. A., A. Hope, M. D., D. Verbyla, J. Gamon, F. Huemmrich, S. Houston, C. Racine, M. Sturm, K. Tape, L. Hinzman, K. Yoshikawa, C. Tweedie, B. Noyle, C. Silapaswan, D. Douglas, B. Griffith, G. Jia, H. Epstein, D. Walker, S. Daeschner, A. Petersen, L. Zhou, and R. Myneni. 2004. Remote sensing of vegetation and land-cover change in arctic tundra ecosystems. Remote Sensing of Environment 89:281-308.

Walker, D.A., H.E. Epstein, W.A. Gould, A N. Kade, A.M. Kelley, J.A. Knudson, W.B. Krantz, G. Michaelson, R.A. Peterson, C.L. Ping, M.K. Raynolds, V.E. Romanovsky, Y. Shur. 2004 . Frost-boil ecosystems: complex interactions between landforms, soil, vegetation, and climate. Permafrost and Periglacial Processes. 15: 171-188.

Jia, G.J., H.E. Epstein and D.A. Walker. 2004. Controls over intra-seasonal dynamics of AVHRR NDVI for the Arctic tundra in northern Alaska. International Journal of Remote Sensing. 25: 1547-1564.

Walker, D.A., G. J. Jia, H. E. Epstein, M. K. Raynolds, F. S. Chapin , III, C. D. Copass, L. D. Hinzman, D. Kane, H. Maier, G. J. Michaelson, F. Nelson, C. L. Ping, V. E. Romanovsky, N. Shiklomanov. 2003. Vegetation-soil-thaw-depth relationships along a Low-Arctic bioclimate gradient, Alaska: synthesis of information from the ATLAS studies. Permafrost and Periglacial Processes. 14: 103-123.

Gould, W.A., D.A. Walker, and D. Biesboer. 2003. Combining research and education: Bioclimatic zonation along a Canadian Arctic transect. Arctic: 45-54.

Gould, W.A., M. Raynolds and D.A. Walker. 2003. Vegetation, plant biomass, and net primary productivity patterns in the Canadian Arctic. Journal of Geophysical Research, 108 (D2):8167, doi:10.1029/2001JD000948.

Peterson, R. A., D. A. Walker, V. R. Romanovsky, J. A. Knudson, M. K. Raynolds, and W. B. Krantz. 2003. A differential frost heave model: cryoturbation-vegetation interactions. Pages 885-890, in Permafrost. Phillips, Springman, and Arenson (eds.) Swets and Sietlinger: Lisse. Proceedings of the 8th International Conference on Permafrost, Zurich, Switzerland, July 21-25, 2003.

Walker, D.A., H.E. Epstein, J.G. Jia, A. Balsar, C. Copass, E.J. Edwards, W.A. Gould, J. Holllingsworth, J. Knudson, H. Meier, A. Moody, and M.K. Raynolds. 2003. Phytomass, LAI, and NDVI in northern Alaska: relationships to summer warmth, soil pH, plant functional types and extrapolation to the circumpolar Arctic. Journal of Geophysical Research, 108 (D2):8169, doi:10.1029/2001JD000986.

Walker, D.A., M. A. Raynolds, N. G. Moskalenko.. 2003. A physiognomic -based circumpolar Arctic Vegetation map. �In: Haeberli, W. and D. Brandova (eds.) ICOP 2003 Permafrost Extended abstracts reporting current research and new information. Glaciology and Geomorphodynamics Group, Geography Department, University of Zurich Switzerland.. pp. 177-178.

Bigelow, N.H. L.B. Brubaker, M.E. Edwards, S.P. Harrison, I.C. Prentice. P.M. Anderson, A.A. Andreeev, P.J. Bartlein, T.R. Christensen, W. Cramer, J.O. Kaplan, A.V. Lozhin, N.V. Maveyeva, D.V. Murray, a.D. McGuire, Y.Y. Razzhivin, J.C. Ritchie, B. Smith, D.A. Walker, K. Gajewski, V.G. Wolf, B.H. Holmquist, Y. Igarashi, K.V. Kremenetskii, A Paus, M.F.J. Pisaric, and V.S. Volkova. 2003. Climate change and Arctic ecosystems I: vegetation changes north of 55?N between the last glacial maximum, mid-Holocene and present, Journal of Geophysical Research, 108 (D19), 8170, 10.1029/2002jd002558.

Kaplan, J.O., N.H. Bigelow, I.C. Prentice, S.P. Harrison, P.J. Bartlein, T.R. Christiansen, W. Cramer, N.V. Matveyeva, A.D. McGuire, D.F. Murray, V.Y. Razzhivin, B. Smith, D.A. Walker, P.M. Anderson, A.A. Andreev, L.B. Brubaker, M.E. Edwards, A.V. Lozhkin. 2003. Climate change and arctic ecosystems II: Modeling paleodata-model comparisons, and future projections. Journal of Geophysical Research, 108 (D19), 8171, 10.1029/2002jd002559.

Jia, G.J., H.E. Epstein, and D.A. Walker. 2003. Greening of the Arctic Alaska, 1981-2001. Geophysical Research Letters, 30: 2067, doi: 10:1029/2003G:O18268,2003.

Walker, D.A., W. A. Gould, H. A. Maier, and M. K. Raynolds. 2002. The Circumpolar Arctic Vegetation Map: AVHRR-derived base maps, environmental controls, and integrated mapping procedures. Int. J. Remote Sensing 23: 2552-2570.

Litaor, I., T. Seasteadt, and D.A. Walker. 2002. Spatial analysis of selected soil attributes across an alpine topographic/snow gradient. Landscape Ecology, 17: 71-85.

McGuire, A.D, M. Apps, J. Beringer, J. Clein, H. Epstein, D.W. Kicklighter, C. Wirth, J. Bhatti, F.S. Chapin III, B. de Groot, D. Efremov, W.Eugster, M Fukuda, T. Gower, L. Hinzman, B. Huntley, G.J. Jia, E. Kasischke, J. Melillo, V. Romanovsky, A. Shvidenko, E. Vaganov, D. Walker. 2002. Environmental variation, vegetation distribution, carbon dynamics, and water/energy exchange in high latitudes. Journal of Vegetation Science, 13: 301-314.

Jia, G.J., H.E. Epstein, D.A. Walker. 2002. Spatial characteristics of AVHRR-NDVI along latitudinal transects in northern Alaska. Journal of Vegetation Science 13: 315-326.

Schickhoff, U., M. D. Walker, D.A. Walker. 2002. Riparian willow communities on the Arctic Slope of Alaska and their environmental relationships: A classification and ordination analysis. Phytocoenologia 32: 145-204.

Walker, D.A., J.G. Bockheim, F.S. Chapin, F.E. Nelson, and C.L. Ping. 2001. Calcium-rich tundra, wildlife, and the Mammoth Steppe. Quaternary Science Reviews, 20: 149-163.

Gould, W.A., S. Edlund, and S. Zoltai, M. Raynolds, D.A. Walker, H. Maier,. 2002. Canadian Arctic Vegetation Mapping. International Journal of Remote Sensing, 21: 4597-4609.

Pomeroy, J.W., P. Hoeller, P. Marsh, D.A. Walker, and M. Williams. 2001. Snow vegetation interactions: Issues for a new initiative. In, (eds. A.J. Dolman, A.J. Hall, M.L. Kavvas, T. Oki and J.W. Pomeroy) Soil-Vegetation-Atmosphere Transfer Schemes and Large Scale Hydrological Models. IAHS Publ. No. 270, IAHS Press, Wallingford, UK 299-305.

Chapin, F.S., III, W. Eugster, J.P. McFadden, A.H. Lynch, and D.A. Walker. 2000. Summer differences among arctic ecosystems in regional climate forcing. J. Climate 13:2002-2010.

Walker, D.A., 2000. Hierarchical subdivision of arctic tundra based on vegetation response to climate, parent material, and topography. Global Change Biology, 6: 19-34.

Walker, D.A., 1999. An integrated vegetation mapping approach for northern Alaska (4,000,000 scale). International Journal of Remote Sensing, 20: 2895-2920.

Muller, S.V., A.E. Racoviteanu, and D.A. Walker. 1999. Landsat-MSS-dreived land-cover map of northern Alaska: extrapolation methods and a comparison with photo-interpreted and AVHRR-derived maps. International Journal of Remote Sensing, 20: 2921-2946.

Walker, M.D., D.A. Walker, J.M. Welker, A.M. Arft, T. Bardsley, P.D. Brooks, J.T. Fahnstock, M.H. Jones, M. Losleben, A.N. Parsons, T.R. Seastedt, P.L. Turner. 1999. Long-term experimental manipulation of winter snow regime and summer temperature in arctic and alpine tundra. Hydrological Processes, 13: 2315-2330.

Jones, M.H., J.T. Fahnestock, D.A. Walker, M. D. Walker, and J.M. Welker. 1998. Carbon dioxide fluxes in moist and dry arctic tundra during the snow-free season: Responses to increases in summer temperature and winter snow accumulation. Arctic and Alpine Research, 30: 373-380.

Walker, D.A., J.G. Bockheim, F.S. Chapin, W. Eugster, J.Y King, J. McFadden, G.J. Michaelson. F.E. Nelson, W.C. Oechel, C.L. Ping. W.S. Reeburgh, S. Regli, N.I. Shiklomanov, and G.L. Vourlitis. 1998. Energy and trace-gas fluxes across a soil-pH boundary in the Arctic. Nature, 394: 469-472.

Muller, S.V., D.A. Walker, F.E. Nelson, N.A. Auerbach, J.G. Bockheim, S. Guyer, and D. Sherba. 1998. Accuracy assessment of a landcover map of the Kuparuk River basin, Alaska: considerations for remote regions. Photogrammetric Engineering and Remote Sensing, 64: 619-628.

Bockheim, J.G., D.A. Walker, L.R. Everett, and Nelson, F.E. 1998. Soils and cryoturbation in moist nonacidic and acidic tundra in the Kuparuk river basin, arctic Alaska. Arctic and Alpine Research, 30: 166-174.

Ping, C.L., J.G. Bockheim, J.M. Kimble, G.J. Michaelson, and D.A. Walker. 1998. Characteristics of cryogenic soils along a latitudinal transect in Arctic Alaska. Journal of Geophysical Research, 103 (D22): 28917-28928.

Nelson, F.E. K.M. Hinkel, N.I. Shiklomanov, G.R. Mueller, L.L. Miller, and D.A. Walker. 1998. Active-layer thickness in north-central Alaska: Systematic sampling, scale, and spatial autocorrelation. Journal of Geophysical Research, 103 (D22): 28963-28974.

Reeburgh, W.S., J.Y. King, S.K. Regli, G.W. Kling, N.A. Auerbach, and D.A. Walker. 1998. A CH4 emission estimate for the Kuparuk River Basin, Alaska. Journal of Geophysical Research, 103 (D22): 29005-29014.

Fahnstock, J.T., M.H. Jones, P.D. Brooks, D.A. Walker, and J.M. Welker. 1998. Winter and early spring CO2 efflux from tundra communities of northern Alaska. Journal of Geophysical Research, 103 (D22): 29023-29028.

Hobbie, J.E., B.L. Kwiatkowski, E.B. Rastetter, D.A. Walker, and R.B. McKane. 1998. Carbon cycling in the Kuparuk Basin: Plant production, carbon storage, and sensitivity to future changes. Journal of Geophysical Research, 103 (D22): 29065-29074.

Stow, D., A. Hope, W. Boynton, S. Phinn, and D. Walker. 1998. Satellite-derived vegetation index and cover type maps for estimating carbon dioxide flux for arctic tundra regions. Geomorphology, 21: 313-327.

Auerbach N., M. D. Walker, and D.A. Walker. 1997. Effects of road and dust disturbance on substrate and vegetation properties in arctic tundra. Ecological Applications, 7: 218-235.

Nelson, F.E., N.I. Shiklomanov, G.R. Mueller, K.M. Hinkel, D.A. Walker and J.G. Bockheim. 1997. Estimating active-layer thickness over large regions: Kuparuk River Basin, Alaska. Arctic and Alpine Research, 29: 367-378.

Walker, M.D., K.R. Everett, D.A. Walker, and P.W. Birkeland. 1996. Soil development as an indicator of relative pingo age, northern Alaska. Arctic and Alpine Research, 28: 352-362.

Walker, D.A., et al. 1995. Toward a new arctic vegetation map: review of existing maps. Journal of Vegetation Science, 6:427-436.

Walker, D.A., N.A. Auerbach, B.E. Lewis, and M.M. Shippert. 1995. NDVI, biomass, and landscape evolution of glaciated terrain in northern Alaska. Polar Record, 31:169-178.

Brooks, P.D., M.W. Williams, D.A. Walker, and S.K. Schmidt. 1995. The Niwot Ridge snow fence experiment: biogeochemical responses to changes in the seasonal snowpack. In: Biogeochemistry of Seasonally Snow-Covered Catchments. Proceedings of a Boulder Symposium, July 1995. IAHS Publ. no. 228, pp. 293-302.

Shippert, M.M., D.A. Walker, N.A. Auerbach, and B.E. Lewis. 1995. Biomass and leaf area index maps derived from SPOT images for the Toolik Lake and Imnavait Creek Area, Alaska. Polar Record, 31:147-154.

Weller, G. F.S. Chapin, K.R. Everett, J.E. Hobbie, D. Kane, W.C. Oechel, C.L. Ping, W.S. Reeburgh, D. Walker, J. Walsh. 1995. The arctic flux study: a regional view of trace gas release. Journal of Biogeography 22, 365-374.

Walker, D.A., 1995. Toward a new circumpolar arctic vegetation map: St. Petersburg Workshop. Arctic and Alpine Reserarch, 31:169-178.

Zhurbenko, M., R. Santesson, D.A. Walker, N.A. Auerbach, and B. Lewis. 1995. New and interesting lichenicolous fungi and lichens from Alaska. Evansia 12: 92-97.

Walker, M.D., D. A. Walker, and N.A. Auerbach. 1994. Plant communties of a tussock tundra landscape, Brooks Range foothills, Alaska. Journal of Vegetation Science, 5:843-866.

Jones, H.G., J.W. Pomeroy, D.A. Walker, and R.A. Hoham. 1994. Snow ecology: a report on a new initiative. Bulletin of the Ecological Society of America, 75:29-31.

Walker, D.A., W.B. Krantz, B.L. Lewis, E.T. Price, and R.T. Tabler. 1994. Hierarchic studies of snow-ecosystem interactions: a 100-year snowpack-alteration experiment. Proceedings of the Eastern and Western Snow Conference, Quebec City, Quebec, Canada, June 8-10. pp. 407-414.

Duguay, C.R. and D.A. Walker. 1994. Environmental modeling and monitoring at the Niwot LTER Site: an overview of recent research activities using GIS. Proceedings of the Second International Conference/ Workshop on Integrating Geographic Information Systems and Environmental Modeling, Breckenridge, CO, September, 1993.

Walker, D.A., J.C. Halfpenny, M. D. Walker, and C.A. Wessman. 1993. Long-term studies of snow-vegetation interacions. BioScience, 43:287-301.

Walker, D.A., and K.R. Everett. 1991. Loess ecosystems of northern Alaska: alkaline tundra gradient and toposequence at Prudhoe Bay. Ecological Monographs, 6:437-464.

Walker, D.A., and M.D. Walker. 1991. History and pattern of disturbance in Alaskan arctic ecosystems: a hierarchical approach to analyzing landscape change. Journal of Applied Ecology, 28:244-276.

Walker, M.D., D.A. Walker, K.R. Everett, and S.K. Short. 1991. Steppe vegetation on south-facing slopes of pingos, central Arctic Coastal Plain, Alaska. Arctic and Alpine Research, 23:170-188.

Slaughter, C.W., C.H. Racine, D.A. Walker, L.A. Johnson, and G. Abele. 1990. Use of off-road vehicles and mitigation of effects in Alaska permafrost environments: a review. Environmental Management, 14:63-72.

Walker, D.A., E.F. Binnian, B.M. Evans, N.D. Lederer, and M.D. Lederer. 1989. Terrain and vegetation of the DOE R4D research site, Imnavait Creek, Alaska. Holarctic Ecology, 12:238-261.

Walker, D.A., N.D. Lederer, M. D. Walker, E. Binnian, K.R. Everett, E. Nordstrand, and P.J. Webber. 1989. Impacts of petroleum development in the Arctic. Science, 245:765-766.

Evans, B.M. D.A. Walker, C.S. Benson, E.A. Nordstrand, and G.W. Petersen. 1989. Spatial interrelationships between terrain, snow distribution and vegetation patterns, Southern Arctic Foothills, Alaska. Holarctic Ecology, 12:270-278.

Walker, D.A., and K.R. Everett. 1987. Road dust and its environmental impact on Alaskan taiga and tundra. Arctic and Alpine Research 19: 479-489

Walker, D.A., 1987. Height and growth-ring response of Salix lanata ssp. richardsonii along the coastal temperature gradient of northern Alaska. Canadian Journal of Botany, 65:988-993.

Walker, D.A., P.J. Webber, E.F. Binnian, K.R. Everett, N.D. Lederer, E.A. Nordstrand and M.D. Walker. 1987. Cumulative impacts of oil fields in northern Alaskan landscapes. Science, 238:757-761.

Walker, D.A., P.J. Webber, M. D. Walker, N.D. Lederer, R.H. Meehan, and E. Nordstrand. 1986. Use of geobotanical maps and automated mapping techniques to examine cumulative impacts in the Prudhoe Bay oil field, Alaska. Environmental Conservation, 13:149-160.

Walker, D.A., M. D. Walker, K.R. Everett, and P.J. Webber. 1985. Pingos of the Prudhoe Bay region. Arctic and Alpine Research, 17:321-336.

Walker, D.A., 1983. A hierarchical tundra vegetation classification especially designed for mapping in northern Alaska. In: Permafrost, Proceedings of the Fourth International Conference, Fairbanks, Alaska. Washington: National Academy Press, pp. 1332-1337.

Klinger, L.F., D.A. Walker and P.J. Webber. 1983. The effects of gravel roads on Alaskan Arctic Coastal Plain tundra. In: Permafrost, Proceedings of the Fourth International Conference, Fairbanks, Alaska. Washington: National Academy Press, pp. 628-633.

Walker, D.A., S.K. Short, J. Andrews and P.J. Webber. 1981. Late Holocene pollen in relation to present day vegetation, Prudhoe Bay and Atigun River, Alaskan Arctic Slope. Arctic and Alpine Research, 13:172-183.

Walker, D.A., and P.J. Webber. 1979. Relationships of soil acidity and air temperature to the wind and vegetation at Prudhoe Bay, Alaska. Arctic 32:224-236.

Walker, D.A., P.J. Webber, K.R. Everett and J. Brown. 1978. The effects of crude oil and diesel spills on plant communities at Prudhoe Bay, Alaska, and the derivation of oil spill sensitivity maps. Arctic, 31:242-259.

Everett, K.R., P.J. Webber, D.A. Walker, R.J. Parkinson and J. Brown. 1978. A geoecological mapping scheme for Alaskan coastal tundra. Proceedings Third International Conference on Permafrost, Edmonton, Alberta, Canada, 10-13 July 1978, National Research Council of Canada, pp. 359-365.

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Refereed government reports, maps, & published abstracts in proceedings volumes:

Jia, G.J., H.E. Epstein, and D.A. Walker. 2007. Trends in vegetation greenness in the Arctic from1982-2005. Eos Trans. AGU 88 (52), Fall Meeting Supplement, Abstract B21-0041.

Bhatt, U.S., D.A. Walker, M. Raynolds, J. Comiso. 2007. The relationship between sea ice variability and arctic tundra on the pan-Arctic, regional and site scales. Eos Trans. AGU 88 (52), Fall Meeting Supplement, Abstract U41C-0612.

Kuss, P. and D.A. Walker. 2007. Project for interlinked Arctic flora and vegetation databases. Proceedings of the Fourth International CAFF Flora Croup Workshop, 15-18 May 2007, T�rshavn, Faroe Islands. US Fish and Wildlife Service, proceedings volume in press.

Walker, D.A., + 17 coauthors. 2006. Biocomplexity of patterned-ground ecosystems. AGU Fall Meeting Program and Abstracts, C44A-04.

Michaelson, G.N., C.L. Ping, H.E. Epstein, J.M. Kimble, V.E. Romanovsky, C.T. Tarnocai, and D.A. Walker. 2006. AGU Fall Meeting Program and Abstracts, C51A-0397.

Gould, W.A., G. Gonzalez and D.A. Walker. 2006. Integrating research and education in a study of biocomplexity in arctic tundra ecosystems: costs, results, and benefits to the research agenda. AGU Fall Meeting Program and Abstracts, C44A-08.

Epstein, H.E., A.M. Kelley, Walker, D.A., G.J. Jia, M.K. Raynolds. 2006. Regional scale vegetation dynamics in patterned ground ecosystems of arctic tundra. AGU Fall Meeting Program and Abstracts, C51A-0396.

Jia, G.J., H.E. Epstein, and D.A. Walker. 2006. Decadal changes of vegetation greenness in the Canadian Arctic. AGU Fall Meeting Program and Abstracts, C51A-0383.

Munger, C.A., Walker, D., M. Raynolds, A. Kade, C. Vonlanthen, P. Kuss and R. Daanen. 2006. AGU Fall Meeting Program and Abstracts, C51A-0383.

Romanovsky, V.E., S.S. Marchenko, R. Daanen, D. Nikolsky, D.O. Sergeev, D.A. Walker. 2006. AGU Fall Meeting Program and Abstracts, C44A-06.

Daanen, R.P., D. Misra, H.E. Epstein, D.A. Walker. 2006. AGU Fall Meeting Program and Abstracts, C44A-07.

Kuss, P., A. Kade, C. Vonlanthen, M.K. Raynolds, N. Matveyeva, F. Daniels, D.A. Walker. 2006. AGU Fall Meeting Program and Abstracts, C44A-05.

Kelley, A.M. H.E. Epstein, D.A. Walker, C. Ping. 2006. Soil nitrogen transformations associated with small patterned-ground features along the complete Arctic bioclimate gradient. AGU Fall Meeting Program and Abstracts, C51A-0395.

Raynolds, M.K., D.A. Walker, A. Kade, C. Vonlanthen, S.G. Vockerroth, C.A. Munger, P. Kuss. 2006. Aboveground phytomass of vegetation communities along an arctic climate gradient. AGU Fall Meeting Program and Abstracts, C51A-0385.

Kade, A., D.A. Walker, V.E. Romanovsky. 2005. The effect of vegetation, soil organic layer and snow on the modified N-factor in patterned-ground ecosystems. AGU Fall Meeting Program and Abstracts, C21A-1135.

Shur, Y., C.L. Ping, and D.A. Walker. 2005. Comprehensive model of frost boils and earth hummocks formation, paper presented at 2nd European Conference on Permafrost (EUCOP), 12-16 Jun 2005, Program and Abstracts, Terra Nostra, Potsdam, Germany, 13-17 June, 2005.

Walker, D.A., R. Daanen, H.Epstein, et al. 2005. The North American Arctic Transect: Patterned ground ecosystems across the full arctic bioclimate gradient. AGU Fall Meeting Program and Abstracts, C24A-03.

Ping, C., G.J. Michaelson, C. Tarnocai, and D.A. Walker. 2005. Cryogenic features of tundra soils along a bioclimate gradient in arctic Alaska and Canada. AGU Fall Meeting Program and Abstracts, C24A-05.

Raynolds, M.K., D.A. Walker, A.N. Kade, and C.A. Munger. 2005. Small-scale patterned ground in the Arctic: Maps of vegetation and thaw depth on a north-south transect. AGU Fall Meeting Program and Abstracts, C24A-06.

Nicolsky, D.J., V.E. Romanovsky, G.S. Tipenko, and D.A. Walker. 2005. Modeling non-sorted circles along low Arctic climate gradient, Dalton Highway, Alaska. AGU Fall Meeting Program and Abstracts, C31A-1107.

Jia, G.J., H.E. Epstein, and D.A. Walker. 2005. Uneven response of arctic tundra to recent environmental changes. AGU Fall Meeting Program and Abstracts, B33E-1092.

Epstein, H.E., D.A. Walker, G.J. Jia, and A.M. Kelley. 2005. Climate, plant biomass, NDVI, and LAI relationships along the full arctic bioclimate gradient. AGU Fall Meeting Program and Abstracts, B33E-1092.

Kelley, A.M., H.E. Epstein, and D.A. Walker. 2005. Soil nitrogen cycling associated with small patterned ground features along a high-latitude temperature gradient in northern Alaska. B51A-0193.

Ping, C.L., J.M. Kimble, G.J. Michaelson, C. Tarnocai and D.A. Walker. 2005. Carbon stores and their distribution in different arctic ecosystems. p. 212. Book of Abstracts, 1st Climate and Cryosphere International Science Conference, 11-15 April 2005, Beijing, China.

Walker, D.A., Epstein, H.E., Kuss, P., Michaelson, G.J., Ping, C.L., Raynolds, M.K., Romanovsky, V.E. & Tarnocai, C.T. 2004. Interactions of multiple factors in creating small patterned-ground features across the Arctic bioclimate gradient. Eos Transactions, AGU 85, fall supplement: F424.

Nikolsky, D.J. V.E. Romanoivsky, G.S. Tipenko, and D.A. Walker. 2004. A coupled thermo-mechanial model of differential frost heave. Eos Transactions. AGU Fall Meeting Supplement, 85: F431.

Gould, W.A., A. Quijano, G. Gonzalez and D.A. Walker. 2003. Variation in frost-boil morphology and associated vegetation characteristics along a climatic gradient. Eos Transactions. AGU Fall Meeting Supplement, 85: F277.

Gould, W.A., G. Gonzalez and D.A. Walker. 2003. Integrating research and education in a study of Arctic frost-boil ecosystems. Eos Transactions. AGU Fall Meeting Supplement, 84: F422.

Walker, D.A., M.K. Raynolds and M.A. Maier. 2003. The Circumpolar Arctic Vegetation Map: a tool for analysis of change in permafrost regions. Eos Transactions. AGU Fall Meeting Supplement, 84: F357.

Walker, D.A., G.J. Gia, H.E. Epstein, N. Shiklomanov, F.Nelson, L.D. Nelson, L.D. Hinzman, V.E. Romanovsky. 2002. (1) Vegetation-soil-active layer relationships along a low-arctic bioclimate gradient, Alaska. Eos Transactions. AGU Fall Meeting Supplement, 83: F241.

Ping, C.L., G.J. Michaelson, J.M. Kimble, and D.A. Walker. 2002. Morphogenesis of soils associated with frost boils in Arctic Alaska. Eos Transactions. AGU Fall Meeting Supplement, 83: F259.

Michaelson, G.J. C.L. Ping, and D.A. Walker. 2002. Biogeochemisty of soils associated with cryptogamic crusts on frost boils. Eos Transactions. AGU Fall Meeting Supplement, Abstract, 83: F260.

Walker, D.A, G.J. Jia., et al. 2002. (2) Vegetation-soil-active-layer relationship along a low-arctic bioclimate gradient, Alaska. American Geophysical Union Fall Meeting, San Francisco, CA.

Copass, C.D., J. Beringer, D. McGuire, F.S. Chapin, D.A. Walker. 2000. Characteristization of vegetation biomass and structure along a gradient from tundra to forest at treeline in Council, Alaska. . Eos, Transactions, American Geophysical Union, 2000 Fall Meeting, 81: F228.

Gould, W.A., M. Raynolds, D.A. Walker. 2000. Vegetation characteristics derived from an integrated vegetation complex map for the Canadian Arctic. Eos, Transactions, American Geophysical Union, 2000 Fall Meeting, 81: F229.

Riedel, S.M., H.E. Epstein, and D.A. Walker. 2000. Biotic controls on spectral reflectance indices of tundra vegetation. . Eos, Transactions, American Geophysical Union, 2000 Fall Meeting, 81: F219.

Walker, D.A., H.E. Epstein, J.G. Jia, E.J. Edwards, and A. Moody. 2000. Climate, vegetation, soil, and spectral reflectance patterns across zonal vegetation boundaries in arctic Alaska. . Eos, Transactions, American Geophysical Union, 2000 Fall Meeting, 81: F223.

Markon, C.J., and Walker, D.A., 2000, Proceedings of the 3rd International Circumpolar Arctic Vegetation Mapping Workshop, U S Geological Survey Open File Report 99-551.

Auerbach, N.A. and D.A. Walker. 1997. An electronic hierarchic geobotanical atlas for arctic system science. In: Walker, D.A., and A.C. Lillie. 1997. Proceedings of the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, 19-24 May 1996 and the CAVM-North American Workshop, Anchorage, Alaska, USA, 14-16 January 1997. INSTAAR Occassional Paper 52, pp. 26-27. 149.

Eugster, W., J. P. McFadden, F. S. Chapin III and D. A. Walker. 1997. Importance of Landscape Age and Plant Community Composition for the Surface Energy Budget and Carbon Fluxes in Alaskan Arctic Tundra', Annales Geophysicae, vol. 15, supplement II, p C356.

Murray, D.F. and D.A. Walker. 1997. �Tundra� and the �Arctic�. In: Walker, D.A., and A.C. Lillie. 1997. Proceedings of the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, 19-24 May 1996 and the CAVM-North American Workshop, Anchorage, Alaska, USA, 14-16 January 1997. INSTAAR Occassional Paper 52, pp. 14-15.

Walker, D.A., 1997. Method for making an integrated vegetation map of northern Alaska (1:4,000,000 scale). In: Walker, D.A., and A.C. Lillie. 1997. Proceedings of the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, 19-24 May 1996 and the CAVM-North American Workshop, Anchorage, Alaska, USA, 14-16 January 1997. INSTAAR Occassional Paper 52, pp. 54-62.

Walker, D.A., and A.C. Lillie. 1997. Proceedings of the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, 19-24 May 1996 and the CAVM-North American Workshop, Anchorage, Alaska, USA, 14-16 January 1997. INSTAAR Occassional Paper 52.

Walker, D.A., 1996. Background and goals of the Circumpolar Arctic Vegetation Mapping Workshop. In: Walker, D.A., and C.A. Markon (eds). Circumpolar arctic vegetation mapping workshop: abstracts and short papers. Open File Report No. 96-251, US Geological Survey, Reston, Virginia, pp. 3-6.

Walker, D.A., 1996. A hierarchic geographic information system for northern Alaska: insights toward a circumpolar arctic vegetation map. In: Walker, D.A., and C.A. Markon (eds). Circumpolar arctic vegetation mapping workshop: abstracts and short papers. Open File Report No. 96-251, US Geological Survey, Reston, Virginia, pp. 100-112.

Welker, J.M., A.N. Parsons, M. D. Walker, D.A. Walker, T.R. Seastedt, C.H. Robinson, and P.A. Wookey. 1995. Comparative responses of Dryas octopetala to simulated changes in climate from alpine, low- and high- arctic ITEX sites. Bulletin of the Ecological Society of America, 76(2): 281.

Walker, D.A., M. D. Walker, J.M. Welker, A.N. Parsons, T.R. Seastedt, B.E. Lewis, and P.D. Brooks. 1995. Long-term snow-fence experiemnts to examine effects of altered winter precipitation regimes in arctic and alpine tundra. Bulletin of the Ecological Society of America, 76(2): 276.

Walker, M.D., D.A. Walker, and K.R. Everett. 1995. Pingos as models of arctic landscape development. Bulletin of the Ecological Society of America, 76(2): 276.

Walker, D.A., N. Auerbach, M. Walker, J. Brown, K. Everett, L. Hinzman, F. Nelson, N. Moskolenko. 1995. Monitoring change in arctic terrestrial ecosystems at multiple scales. Workshop to define research priorities for Russian Arctic land-shelf systems. Columbus, Ohio, 10-12 January 1995, BPRC Miscellaneous Series M-335, pp. 118-120.

Everett, K.R. J. Brown, D.A. Walker and P.J. Webber. 1994. Long-term natural recovery of development related disturbances in northern Alaska. Extended abstracts for an international conference on "The industrial development of the North and problem of recultivation", Syktyvkar, USSR, July 8-14, 1991. Byrd Polar Research Center Miscellaneous Series M-334, Byrd Polar Research Center, The Ohio State University, Columbus, Ohio, pp. 47-48.

Shippert, M.M., D.A. Walker, N.A. Auerbach, B.E. Lewis. 1994. Regional biomass and leaf-area estimates derived from satellite imagery as inputs to spatial trace-gas models for arctic tundra. Bulletin of the Ecological Society of America, 75(2): 211.

Walker, D.A., M. D. Walker, L.R. Lestak, K.R. Everett, P.J. Webber. 1994. Application of geographic information systems to the problem of cumulative impacts in the Prudhoe Bay Oil Field, Alaska. Extended abstracts for an international conference on "The industrial development of the North and problem of recultivation", Syktyvkar, USSR, July 8-14, 1991. Byrd Polar Research Center Miscellaneous Series M-334, Byrd Polar Research Center, The Ohio State University, Columbus, Ohio, pp. 116-118.

Lewis, B.E., E.T. Price, and D.A. Walker. 1993. A snow fence experiment to examine long-term ecosystem response to altered snow regimes in the Colorado alpine. Bulletin of the Ecological Society of America, 74(2): 328-329.

Walker, D.A., Auerbach, N.A., K.R. Everett, M.M. Shippert, and M.D. Walker. 1993. Large-scale disturbance features in northern Alaska affect regional carbon budgets. Bulletin of the Ecological Society of America, 74(2): 475.

Walker, M.D., D.A. Walker, and K.R. Everett. 1989. Wetland soils and vegetation, Arctic Foothills, Alaska. U.S. Department of Interior, Fish and Wildlife Service, Biological Report 89(7), 89 pp.

Walker, D.A., D. Cate, J. Brown, and C. Racine (Eds.). 1987. Disturbance and recovery of arctic Alaskan tundra terrain, a review of recent investigations. U.S. Army Cold Regions Research and Engineering Laboratory, CRREL Report 87-11, 63 pp.

Walker, D.A., and W. Acevedo. 1987. Vegetation and a Landsat-derived land cover map of the Beechey Point Quadrangle, Arctic Coastal Plain, Alaska. U.S. Army Cold Regions Engineering and Research Laboratory, CRREL Report 87-5, 63 pp.

Walker, D.A., 1988. Terrain and vegetation types of the Sagavanirktok Quadrangle, Alaska. Final report of NASA-Ames University Consortium Agreement No. NCA21-106 �Landsat Land cover Classification of the Sagavanirktok Quadrangle, Alaska�.

Acevedo, W. and D. Walker. 1987. Vegetation and land cover, Beechey Point, Alaska (1:250,000). U.S. Geological Survey, Map L-0211.

Walker, D.A., 1985. The vegetation and environmental gradients of the Prudhoe Bay region. U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. CRREL Report No. 85-14. 239 pp.

Simmons, C.L., K.R. Everett, D.A. Walker, A.E. Linkins and P.J. Webber. 1983. Sensitivity of plant communities and soil flora to seawater spills, Prudhoe Bay, Alaska. U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, H.H. CRREL Report 83-24. 35 p.

Acevedo, W., D.A. Walker, L. Gaydos and J. Wray. 1982. Vegetation and land cover Arctic Wildlife Refuge, Coastal Plain Alaska (colored 1:250,000 scale map). Dept. of Interior, U.S. Geological Survey. Map I-1443.

Walker, D.A., K.R. Everett, W. Acevedo, L. Gaydos, J. Brown and P.J. Webber, 1982. Landsat-assisted environmental mapping in the Arctic National Wildlife Refuge, Alaska. In: Draft environmental impact statement and draft regulations (for the proposed oil and gas exploration within the coastal plain of the Arctic National Wildlife Refuge, Alaska. U.S. Dept. of Interior, p. 829-890, with 3 maps.

Walker, D.A., K.R. Everett, W. Acevedo, L. Gaydos, J. Brown and P.J. Webber. 1982. Landsat assisted environmental mapping in the Arctic National Wildlife Refuge, Alaska. U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. CRREL.

Walker, D.A., and P.J. Webber. 1980. Vegetation mapping. In: Brown, J. and R.L. Berg (eds.), Environmental Engineering and Ecological Baseline Investigations Along the Yukon River - Prudhoe Bay Haul Road. U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. CRREL Report 80-19:45-58.

Walker, D.A., and E. Werbe. 1980. Dust impacts on vegetation. In: Brown, J. and R.L. Berg (eds.), Environmental Engineering and Ecological Baseline Investigations Along the Yukon River - Prudhoe Bay Haul Road. U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. CRREL Report 80-19:126-127.

Abele, G., D.A. Walker, J. Brown, M.C. Brewer and D.M. Atwood. 1978. Effects of low ground pressure vehicle traffic at Lonely, Alaska. U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory, Hanover, N.H. CRREL Special Report 78-16. 63 pp.

Walker, D.A., P.J. Webber, K.R. Everett and J. Brown. 1977. The effects of low-pressure wheeled vehicles on plant communities and soils at Prudhoe Bay, Alaska. U.S. Army Cold Regions Research Engineering Laboratory, Hanover, N.H., CRREL Special Report 77-17. 49 pp.

Webber, P.J. and D.A. Walker. 1975. Vegetation and landscape analysis at Prudhoe Bay, Alaska: a vegetation map of the Tundra Biome study area. In: Brown, J. (ed.), Ecological Investigations of the Tundra Biome in the Prudhoe Bay Region, Alaska. Biological Papers of the University of Alaska, Special Report No. 2. pp. 81-91.

Webber, P.J., D.A. Walker, and F. Rowley. 1975. Gradient analysis of plant growth forms. In: Brown, J. (ed.), Ecological and limnological reconnaissance from Prudhoe Bay into the Brooks Range, Alaska. RATE (Research on Arctic Tundra Environments). pp. 31-55.

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Book reviews:

Geology and Plant Life. Arthur R. Kruckeberg. Seattle: University of Washington Press. 2002, 362 pp. Reviewed in Ecoscience.

Polar and Alpine Tundra. Edited by F.E. Wielgolaski. Amsterdam: Alsevier Science. 1997, 930 pp. Reviewed in Arctic, Antarctic, and Alpine Research, 32: 107-108, February 2000.

European Vegetation Survey: Case Studies. Edited by L. Mucina, S. Pignatti, J.S. Rodwell, J.H.HJ. Schaminee, and M. Chytry. Uppsala: Opulus Press, 1997. Reviewed in Journal of Vegetation Science, 10: 138.

Ecology of a Polar Oasis. Edited by Josef Svoboda and Bill Freedman. Toronto: Captus University Publications, 1994. iv + 268 pp and an annex. Reviewed in Arctic and Alpine Research, February, 1995.

The Trans-Alaska Pipeline Controversy: Technology, Conservation and the Frontier. Peter A. Coates. Bethlehem, Pa.: Lehigh University Press, 1991, 447 pp. Reviewed in Arctic and Alpine Research, November, 1992.

Research in Arctic life and earth sciences: present knowledge and future perspectives. Edited by Mats Sonesson. Ecological Bulletins 38, 112 pp. Reviewed in Arctic and Alpine Research, 19(1), February 1989.

Northern Ecology and Resource Management: Memorial Essays Honouring Don Gill. Edited by R. Olson, R. Hastings, and F. Geddes. Edmonton: University of Alberta Press. xviii + 438 pp. Reviewed in Arctic and Alpine Research, 18(1), February, 1986.

Past and Present Vegetation of the Far Northwest Canada. by J.C. Ritchie, 1984. Toronto: University of Toronto Press. xi + 251 pp. Reviewed in Arctic and Alpine Research, 17(3), August 1985.

Permafrost: Fourth International Conference: Proceedings. Washington, D.C.: National Academy Press, 1983. xxv + 1554 pp. Reviewed in Arctic and Alpine Research, 16(1), February 1984.

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Unpublished papers and posters presented at conferences and workshops (* invited):

Bhatt, U.S., D.A. Walker, M.K. Raynolds, J. Comiso. 2007. Influence of Regional Sea Ice Variability on Arctic Tundra. 7th International Conference on Global Change: Connection to the Arctic (GCCA-7), Fairbanks Alaska, February 2007.

Walker, D.A., 2007. Overview of climate and land-cover change in the Arctic. Talk given at the NASA Land-Cover Land-Use Change Science Team Meeting, University of Maryland, 4-6 Apr 2007.

Raynolds, M.K and D.A. Walker. 2006. Satellite land surface temperatures and tundra vegetation. Arctic Science Conference. Fairbanks AK, 2-4 October 2006. p 55.

Walker, D.A., U. Bhatt, J.C. Comiso, H.E. Epstein , B.C. Forbes, G.J. Jia , J.O. Kaplan, M.O. G.P. Kofinas, Leibman, N. Moskalenko, M.K. Raynolds, V.E, Romanovsky. 2006. Application of space-based technologies and models to address land-cover/land-use change problems on the Yamal Peninsula, Russia. Poster presented at the NASA Land-Cover and Land-Use Change Science Team Meeting, University of Maryland, October 10-12, 2006.

Walker, D.A., 2006. Greening of the Arctic: an IPY initiative. Oral presentation at the Arctic AAAS meeting, Fairbanks, AK, 2-4 Oct 2006. 194. Walker, Skip, H. Epstein, J. Jia, et al. 2006. Greening of the Arctic: an IPY initiative. Poster presented at the 2006 Arctic Forum, 25-26 May 2006, Washington, D.C.

Walker, D.A., 2005. Application of space-based technologies and models to address land-cover/land-use change problems on the Yamal Peninsula, Russia. Talk given at the NEESPI Briefing for IGBP Leadership, San Francsisco, 4 Dec 2005.

Walker, D.A., et al. 2005. Greening of the Arctic: an IPY initiative to examine NDVI/ biomass trends and sea-ice linkages across the full Arctic bioclimate gradient: transects in North America and Eurasia. Poster presented at the International Conference on Arctic Research Planning (ICARP II), Copenhagen, Denmark, 10-12 Nov 2005.

*Walker, D.A., Recent changes to arctic tundra vegetation. Talk presented at the NOAA State of the Arctic Workshop, Woods Hole, MA, 24-26 Oct 2005.

*Walker, D.A., M.K. Raynolds, H.A. Maier. 2005. Circumpolar Arctic Vegetation Map: application for a plant-community-level map. Invited talk at the Arctic Network of Parks Terrestrial Scoping Workshop, 26-28 April 2005.

Ping, C.L., G.J. Michaelson, Y. Shur, C. Tarnocai, and D.A. Walker. 2005. Nonsorted circles and soil formation in Arctic Canada. Abstract, 2nd European Permafrost Conference, June 12-16, 2005. Potsdam, Germany.

Tarnocai, C. and D. Walker. 2005. Turf hummocks along a climatic gradient in Arctic Canada: characteristics and development. Talk at the 2nd European Conference on Permafrost, 12-16 June 2005, Potsdam, Germany.

Kade, A., D.A. Walker, V.E. Romanovsky. 2005. The N-factor along a climate gradient in patterned-ground ecosystems. Talk at the European Conference on Permafrost (EUCOP), Potsdam, Germany, 13-17 Jun 2005.

Shur, Y C.L. Ping, and D.A. Walker, 2005. Comprehensive Model of Frost Boils and Earth Hummocks Formation Talk at the European Conference on Permafrost (EUCOP), Potsdam, Germany, 13-17 Jun 2005.

Walker, D.A., Kade, A.N., Michaelson, G.J., Ping, C.L., Raynolds, M.K., Romanovsky, V.E., Epstein, H.E., Kelley, A.M., Gould, W.A., Gonzalez, G., Krantz, W.B. 2005. Biocomplexity of small periglacial patterned-ground forms: Polygenetic formation of surface forms along the Arctic bioclimate gradient. Biocomplexity in the Environment Awardees Meeting, Arlington, VA, 21-23 Mar 2005.

*Walker, D.A., 2005. Biocomplexity of frost-heave features. Invited talk to the University of Alaska Anchorage Complex Systems Group. 21 Mar 2005, Anchorage, Alaska.

Raynolds, M.K. and D.A. Walker. 2004. The Circumpolar Arctic Vegetation Map: Analysis of distribution and NDVI of vegetation types. Abstracts of the 8th Circumpolar Symposium on Remote Sensing of Polar Environments, June 8-12, 2004, Chamonix, France. p. 18.

Gould, W.A., D.A. Walker, M.K. Raynolds, F.J.A. Daniels, A. Elvebakk, N. Matveyeva. 2004. Variation in plant community composition along topographic and climatic gradients in the Canadian Arctic: results of the CAVM Canadian transect. Second International Workshop on Circumpolar Vegetation Classification and Mapping, Tromso, Norway, 2-6 June 2004, p. 35.

Kade, A., D.A. Walker and M.K. Raynolds. 2004. Classification and ordination of frost-boil ecosystems along a climate gradient in the Low Arctic, Alaska. Second International Workshop on Circumpolar Vegetation Classification and Mapping, Tromso, Norway, 2-6 June 2004, p. 44-45.

Raynolds, M.K., D.A. Walker and H.A. Maier. 2004. Plant-community-level mapping of Alask based on the Circumpolar Arctic Vegetation Map. Second International Workshop on Circumpolar Vegetation Classification and Mapping, Tromso, Norway, 2-6 June 2004, p. 76-79.

Walker, D.A., M.K. Raynolds, H.A. Maier and the CAVM Team. 2004. A vegetation map of the arctic tundra biome (scale 1:7,500,000): Overview, methods, legend and analysis. Second International Workshop on Circumpolar Vegetation Classification and Mapping, Tromso, Norway, 2-6 June 2004, p. 91-93.

D.A. Walker, M.K. Raynolds, N.G. Moskalenko, and the CAVM Team. 2003. A physiognomic-based circumpolar Arctic Vegetation map. Poster presented at the Eighth International Conference on Permafrost, 21-25 July 2003 Zurich, Switzerland.

Walker, D.A., A.N. Kade, G. Michaelson, C.L. Ping, M.K. Raynolds, V.E. Romanovsky, H.E. Epstein, A.MN. Kelley, W.A. Gould, G. Gonzalez, W.B. Krantz, and C.T. Tarnocai. 2003. Biocomplexity of Frost-Boil Ecosystems: Models for Analyzing Self-organization across the Arctic Bioclimate Gradient. Poster presented at the Biocomplexity in the Environment Awardees Meeting, Arlington, VA 15-17 Sep 2003, p. 41.

Gould, W.A., G. Gonzalez, and D.A. Walker. 2003. Biocomplexity of Frost-boil Ecosystems: Integrating science and education. Poster presented at the Biocomplexity in the Environment Awardees Meeting, Arlington, VA 15-17 Sep 2003.

Kade, A. and D.A. Walker. 2003. Manipulation of vegetation canopy and the effecgs on cryoturbation regime in Alaskan Arctic Tundra. Poster presented at the 54th Arctic Science Conference, Fairbanks, AK., 18-21 September 2002 Program and Abstracts, 21-24 Sep 2003, p. 222.

Walker, D.A., A.N. Kade, G. Michaelson, C.L. Ping, M.K. Raynolds, V.E. Romanovsky, H.E. Epstein, A.MN. Kelley, W.A. Gould, G. Gonzalez, W.B. Krantz, and C.T. Tarnocai. 2003. Biocomplexity of frost boil ecosystems: 2003 Expedition to Banks Island and Prince Patrick Island, Canada. Oral presentation at the 54th Arctic Science Conference, Fairbanks, AK., 18-21 September 2003 Program and Abstracts, p. 221.

C.A. Munger and D.A. Walker. 2003. Vegetation of the upper Kuparuk River region in relationship to glacial geology and surficial geomorphology. Poster presented at the 54th Arctic Science Conference, Fairbanks, AK., 18-21 September 2002 Program and Abstracts, p. 225.

M.K. Raynolds, J.C. Burian, D.A. Walker, and H.A. Maier. 2003. Relationship between plant biomass and arctic tundra bioclimate subzones based on the Circumpolar Arctic Vegetation Map. Poster presented at the 54th Arctic Science Conference, Fairbanks, AK., 18-21 September 2003 Program and Abstracts, p. 226.

Cushing, E.E., D.A. Walker, and A.N. Kade. 2003. Differences in vegetation and thaw depths of frost boils and inter-boils in acidic and nonacidic tundra. 53rd Arctic Science Conference, Fairbanks, AK., 18-21 September 2002 Program and Abstracts, p. 88.

Kade, A. and D.A. Walker. 2003. Experimental investigation of vegetation and cryoturbation interactions in Alaskan arctic tundra. 53rd Arctic Science Conference, Fairbanks, AK., 18-21 September 2002 Program and Abstracts, p.128.

Raynolds, M.K., D.A. Walker, et al. 2003. Draft of the Circumpolar Arctic Vegetation Map. 53rd Arctic Science Conference, Fairbanks, AK., 18-21 September 2002 Program and Abstracts, p.186.

Walker, D.A.,J.A. Knudson, et. al. 2003. Biocomplexity of frost-boil ecosystems. 53rd Arctic Science Conference, Fairbanks, AK., 18-21 September 2002 Program and Abstracts, p. 231.

Walker, D.A., 2002. Active-layer-vegetation interactions: The Circumpolar Arctic Vegetation Map and a network of active layer monitoring sites as part of the Biocomplexity in the Environment initiative. Talk given at the Circumpolar Active Layer Monitoring (CALM) Workshop, 11-15 Nov 2002, Lewes, Deleware.

Walker, D.A., V.E. Romanovsky, and W.B. Krantz. 2002. Cryoturbation-ecosystem interactions: Field observations and experiments to validate a new model of frost-boil formation and its relevance to climate change. Talk given at the IARC/CIFAR PI Final Results Meeting 20-22 Oct 2002, Boulder CO.

Walker, D.A., G.J. Jia, H.E. Epstein, L.D. Hinzman, G.J. Michaelson, F. Nelson , C.L. Ping, M.R. Raynolds, N. Shiklomaov, V.E. Romanovsky. 2002. (3) Vegetation-soil-active layer relationships along a low-arctic bioclimate gradient, Alaska. EOS, Trans. AGU, Fall Meet. 2002.

Walker, D.A., V.E. Romanovsky, W.B. Krantz, C.L. Ping, R.A. Peterson, M.K. Raynolds, H.E. Epstein, G.J. Jia, D.C. Wirth. 2002. Biocomplexity of frost boil ecosystems on the Arctic Slope, Alaska. The Arctic Forum, Arlington, VA, 16-17 May 2002.

Knudson, J.A., Hollingsworth, H.A. Maier, M.K. Raynolds, and D.A. Walker. 2001. A framework for a web-based GIS for a circumpolar arctic geobotanical atlas. Poster presented at the Arctic GIS Workshop. 22-24 Jan 2000, Seattle, WA.

*George, Shari, B. Hay, J. Knudson, H. Maier, K. Nance, M. Raynolds, D. Walker. 2001. The University of Alaska Fairbanks: A member of an Arctic GIS community. Talk given at the Arctic GIS Workshop. 22-24 Jan 2000, Seattle, WA.

Gould, W.A., M.K. Raynolds, and D.A. Walker. 2001. Vegetation characteristics derived from an integrated vegetation complex map for the Canadian Arctic. Poster presented at the Arctic GIS Workshop. 22-24 Jan 2000, Seattle, WA.

Walker, D.A., W.A. Gould, H.A. Maier, M.K. Raynolds, S.V. Muller. 2000. The Circumpolar Arctic Vegetation Map: Environmental controls, AVHRR-derived base maps, and integrated mapping procedures. 6th Circumpolar Symposium on Remote Sensing of Polar Environments, Yellowknife, Northwest Terreitories, Canada 12-14 May 2000.

Walker, D.A., V.E. Romanovsky, W.B. Krantz, et al. 2000. Cryoturbation-ecosystem interactions: project overview and first field season results. Poster presented at the IARC/CIFAR Principal Investigators Meeting, 23-25 October 2000, Fairbanks, AK.

Walker, D.A., W.A. Gould, H.A. Maier, M.K. Raynolds, and the CAVM Editorial Board. 2000. An AVHRR-image-based Circumpolar Arctic Vegetation Map: A hierarchical approach using image intepretation and integrated mapping methods. Poster presented at the ARCSS LAII Science Workshop, Seattle, WA, 23-26 Feb 2000.

Gould, W.A., D.A. Walker, and M.K. Raynolds. 2000. Canadian transect and mapping for the Circumpolar Arctic Vegetation Map. Poster presented at the ARCSS LAII Science Workshop, Seattle, WA, 23-26 Feb 2000.

Moody, A., E.J. Edwards, D.A. Walker, H. Epstein, J. Jia, C.L. Ping, G. Michaelson, and L. Hinzman. 2000. A western Alaska transect to examine interactions of climate, substrate, vegetation, and spectral reflectance: ATLAS grids at Barrow, Atqasuk, Oumalik, and Ivotuk, Alaska, 1999. . Poster presented at the ARCSS LAII Science Workshop, Seattle, WA, 23-26 Feb 2000.

Muller, S.V., D.A. Walker, and A. Moody. 2000. Accuracy assessment of a MSS-derived landcover map of Northern Alaska. 2000. Poster presented at the ARCSS LAII Science Workshop, Seattle, WA, 23-26 Feb 2000.

Gould, W.A., M.K. Raynolds, D.A. Walker, H.A. Maier, S. Edlund, and S. Zoltai. 2000. Canadian arctic vegetation: An integrated vegetatin complex map for the Circumpolar Arctic Vegetation Mapping project. Poster presented at 6th Circumpolar Symposium on Remote Sensing of Polar Environments, Yellowknife, Northwest Terreitories, Canada 12-14 May 2000.

Jia, J., H.E. Epstein, and D.A. Walker. 2000. Spatial and intraseasonal characeristics of AVHRR-NDVI for the arctic tundra in northern Alaska. . Poster presented at the ARCSS LAII Science Workshop, Seattle, WA, 23-26 Feb 2000.

Riedel, S.M., H.E. Epstein, D.A. Walker, D.L. Richardson, and M.P. Calef. 2000. Seasonal variations in NDVI, LAI, and biomass on four tundra vegetation tyupes at Ivotuk, Alaska. . Poster presented at the ARCSS LAII Science Workshop, Seattle, WA, 23-26 Feb 2000.

Walker, D.A., J.G. Bockheim, F.S. Chapin, W. Eugster, F.E. Nelson, and C.L. Ping. 1998. Calcium-rich tundra and its importance to wildlife: Past, present, and future. Poster presented at the 49th Arctic Science Conference, University of Alaska. Fairbanks, 25-28 October 1998.

Walker, D.A., M. D. Walker, A.M. Arft, J.M. Welker, M.H. Jones, J.T. Fahnstock, P.D. Brooks, T.R. Seastedt, A.N. Parsons, T.L. Turner. 1997. Long-term snow-fence experiments to examine effects of altered climate in arctic and alpine tundra. Poster presented at the Western Snow Conference and Eastern Snow Conference, Banff, Alberta, May 4-8, 1997.

Walker, D.A., M. D. Walker, J.M. Welker, A.M. Arft, T. Bardsley, P.D. Brooks, J.T. Fahnestock, M.H. Jones, M. Losleben, A.N. Parsons, T.R. Seastedt, and P.L. Turner. 1998. Long-term experimental manipulation of winter snow regime and summer temperature in arctic and alpine tundra: An integrated ecosystem approach. International Conference on Snow Hydrology: The integration of physical, chemical, and biological systems. Brownsviulle, Vermont, USA 6-9 Oct 1998.

*Walker, D.A., 1997. Moist nonacidic tundra: possible causes and significance to Beringian paleoenvironments. Beringian Paleoenvironments Workshop. Florissant, CO. 20-23 Sep 1997.

Eugster, W., J. P. McFadden, F. S. Chapin III and D. A. Walker. 1997. Importance of Landscape Age and Plant Community Composition for the Surface Energy Budget and Carbon Fluxes in Alaskan Arctic Tundra', Annales Geophysicae, vol. 15, supplement II, p C356.

*Walker, D.A., 1997. Climatic, topographic, and substrate controls over distribution of arctic vegetation. Paper presented at the Extrapolation of Arctic and Broeal Processes that Feedback to Climate Workshop. National Center for Ecosystem Analysis and Synthesis, Santa Barbara, CA, 6-9 Apr 1997.

Walker, D.A., 1997. Mapping of northern Alaska: methodology, legend, results, problems. Paper presented at the CAVM-North American Workshop, Anchorage, AK, 14-16 Jan 1997.

Walker, D.A., Auerbach, J.G. Bockheim, F.S. Chapin III, W. Eugster, J. McFadden, G.J. Michaelson, F.E. Nelson, C.L. Ping, W.S. Reeburg, S. Regli, N.I. Shiklomanov. 1997. Moist nonacidic tundra: relevance to arctic land-atmosphere fluxes, wildlife, and human dimensions of arctic systems. Paper presented at the ARCSS-LAII Science Workshop, Seattle, WA, 27-29 Mar 1997.

Gould, W., M. Walker, D.A. Walker, T. Edmands, M.A. Dornfield, N. Auerbach, T. Nettleton, S.V. Muller. 1997. Decade-scale changes in vegetation in the Brooks Range, Southern Alaska Foothills, Alaska. Poster presented at the ARCSS-LAII Science Workshop, Seattle, WA, 27-29 Mar 1997.

Muller, S.V., D.A. Walker, N.A. Auerbach, J. Bockheim, S. Guyer, F. Nelson, and D. Sherba. 1997. Accuracy assessment of a landcover map of the Kuparuk River basin, Alaska. Poster presented at the ARCSS-LAII Science Workshop, Seattle, WA, 27-29 Mar 1997.

Walker, D.A., N.A. Auerbach, and M.J. Kohn. 1997. A circumpolar arctic vegetation map: statement of purpose, plan for international collaboration, and a prototype map for northern Alaska. Poster presented at the ARCSS-LAII Science Workshop, Seattle, WA, 27-29 Mar 1997.

Walker, D.A., N.A. Auerbach, L.R. Lestak, S.V. Muller, and M.D. Walker. 1996. A hierarchic GIS for studies of process, pattern, and scale in arctic ecosystems: the Arctic System Science Flux Study, Kuparuk River Basin, Alaska. Poster presented at the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, May 20-23, 1996. (This same poster was presented at the ESRI ARC/INFO Users� Conference, Palm Springs, CA, May 20-24, 1996).

Brown, J., F.E. Nelson, D.A. Walker, and G.M. Marion. 1996. A Circumpolar Active Layer Monitoring (CALM) Program. Poster presented at the Arctic System Science Flux Study Workshop. Seattle, WA, 22-24 Feb 1996.

Walker, D.A., M. D. Walker, N.A. Auerbach, L.R. Lestak, and S. Muller. 1996. A Landsat-derived landcover map of the Kuparuk River Basin, Alaska: a component of hierarchic GIS for the study of arctic land-atmosphere interactions. Poster presented at the Arctic System Science Flux Study Workshop. Seattle, WA, 22-24 Feb 1996.

Auerbach, N. A. and D.A. Walker. 1996. Modern Vegetation Patterns at Barrow and Barter Island: Relevance to Disturbance and Recovery, and Paleoenvironmental Studies. Poster presented at the 26th Arctic Workshop, Boulder, CO, 14-16 March 1996.

Walker, D.A., M. D. Walker, N.A. Auerbach, L.R. Lestak, S. Muller. 1996. A Hierarchic GIS for Studies of Process, Pattern and Scale for the Kuparuk River Basis: a contribution to the Arctic System Science (ARCSS) Flux Study. Poster presented at the 26th Arctic Workshop, Boulder, CO, 14-16 March 1996.

*Walker, D.A., N.A. Auerbach, J.G. Bockheim, C.-L. Ping, G. Michaelson, F.E. Nelson, N.I. Shiklomanov, G.R. Mueller, F.S. Chapin III, W. Eugster, J. McFadden, K.R. Everett, L. Everett, K. Hinkel, L. Miller, W.S. Reeburgh. 1996. Studies of process, pattern and scale in arctic ecosystems. Paper presented the American Geophysical Union Meeting, 13-16 Dec 1996, San Francisco, CA.

Walker, D.A., 1996. Review of progress at the first CAVM workshop aned goals of the Arendal workshop. Paper presented at the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, 20-24 May 1996.

Auerbach, N.A. and D.A. Walker. 1996. An hierarchical electronic geobotanical atlas for arctic system science. Paper presented at the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, 20-24 May 1996.

Murray, D.F. and D.A. Walker. 1996. Setting the stage. Paper presented at the Second Circumpolar Arctic Vegetation Mapping Workshop, Arendal, Norway, 20-24 May 1996.

Walker, D.A., and S.S. Talbot. 1996. Progress toward circumpolar arctic vegetation mapping. Alaska Surveying and Mapping Conference Proceedings. Anchorage, Alaska, 5-9 Feb 1996.

*Walker, D.A., 1995. A review of disturbance and recovery of Arctic Alaska vegetation related to oil-field development. Invited paper at a workshop on �Disturbance and Recovery of Arctic Terrestrial Ecosystems�, University of Lapland, Rovaniemi, Finland, September 24-30, 1995.

Walker, D.A., M. D. Walker, N.A. Auerbach, L.R. Lestak, B.E. Lewis, D.S. Schimel, M.M. Shippert. 1995. A hierarchic GIS for studies of process, pattern and scale in arctic ecosytems. Paper presented at the ARCSS-LAII Science Workshop, 1-5 March 1995, Orcas Island, Washington.

Walker, D.A., M. Walker, N. Auerbach, L. Lestak, B. Lewis, and K. Rose. 1995. A vegetation map of the upper Kuparuk River region, Alaska: a component of a hierarchic GIS for studies of arctic land-atmosphere interactions. ESRI Users Conference, Palm Springs, CA. 22-26 May, 1995.

Brown, J., F.E. Nelson, D.A. Walker. 1995. Circumarctic active layer monitoring (CALM): an international contribution to ITEX. Paper presented at the 6th International Tundra Experiment (ITEX) Workshop, 7-11 April 1995, University of Ottawa, Ottawa, Canada.

Walker, D.A., N.A. Auerbach, B.L. Lewis, and M.M. Shippert. 1994. Remote sensing of acid and nonacid tundra regions in northern Alaska and relevance to arctic landscape succession. Paper presented at the Third Circumpolar Symposium on Remote Sensing of Arctic Environments, 16-20 May, 1994, Fairbanks, Alaska.

Shippert, M.M., D.A. Walker, and N.A. Auerbach. 1994. Biomass and leaf-area index maps derived from SPOT images for the Toolik Lake and Imnavait Creek Area, Alaska. Paper presented at the Third Circumpolar Symposium on Remote Sensing of Arctic Environments, 16-20 May, 1994, Fairbanks, Alaska.

Suding, P.W., W.B. Krantz, D.A. Walker, and B.E. Lewis. 1994. Field Study of the Effect of Increased Snow Depth on Frost Penetration. Paper presented at the 70th Annual Meeting of the Southwestern and Rocky Mountain Division of the American Association for the Advancement of Science, Durango, Colorado, May 22-26, 1994.

Brooks, P., M.W. Williams, D.A. Walker, and S.K. Schimdt. 1994. Nitrous oxide and carbon dioxide flux from snow covered soils: responses to changes in precipitation and temperature. American Geophysical Union Meeting, San Francisco, 5-9 Dec 1994.

*Walker, D.A., W.B. Krantz, B.E. Lewis, E.T. Price, R.D. Tabler, M. D. Walker, and C.A. Wessman. 1993. Multi-scale studies of snow-vegetation interactions in the alpine zone. Talk presented at the International Workshop on Snow Ecology. June 3-7, Quebec City, Canada.

*Walker, D.A., 1993. Long-term research in the alpine: overview of the Long-Term Ecological Resarch (LTER) project and the International Tundra Experiment (ITEX). October 21, 1993. Wildlife Institute of India, Dehradun, India.

*Walker, D.A., 1993. Hierarchic geographic information systems: applications to alpine research, disturbance studies, and climate change. October 22, 1993. Wildlife Institute of India, Dehradun, India.

Duguay, C.R. and D.A. Walker. 1993. Environmental modeling and monitoring at the Niwot LTER Site: an overview of recent research activities using GIS. Second International Conference/ Workshop on Integrating Geographic Information Systems and Environmental Modeling, Breckenridge, CO, September, 1993.

Price, E.T., W.B. Krantz, and D.A. Walker. 1993. Thermal characteristics and frost penetration rate of alpine soils with diffrential snow cover. Southwestern and Rocky Mountain Division, AAAS 69th annual meeting, Albuquerque, New Mexico, 23-27 May.

Walker, D.A., 1992. Hierarchical geographic information systems for the Arctic. Paper presented at the International workshop on classification of circumpolar arctic vegetation. University of Colorado, Boulder, CO, March 5-9, 1992.

Walker, M.D. and D.A. Walker. 1992. Classification and gradient analysis of the Brooks Range Foothills, Alaska. Paper presented at the International workshop on classification of circumpolar arctic vegetation. University of Colorado, Boulder, CO, March 5-9, 1992.

Walker, D.A., M.D. Walkr, N.A. Auerbach, and L.R. Lestak. 1992. A hierarchical GIS for modeling tundra ecosystem processes. Poster presented at the 12th Annual ESRI User's Conference, Palm Springs, CA, May 20-25, 1992.

Walker, D.A., N.D. Lederer, L.R. Lestak. 1991. Niwot Ridge/ Green Lakes Valey Lter Site. Poster presented at the 11th Annual ESRI User's Conference, Palm Springs, CA, May 20-25, 1991.

Walker, D.A., M. D. Walker, N.A. Auerbach, and L.R. Lestak. 1991. A Hierarchical GIS for modeling tundra ecosystem processes. Poster presented at the First International Conference/ Workshop on Integrating Geographic Information Systems and Environmental Modeling, Boulder, CO, 15-19 Septmeber 1991.

*Walker, D.A., M. D. Walker, L.R. Lestak, K.R. Everett, P.J. Webber. 1991. Application of geographic information systems to the problem of cumulative impacts in the Prudhoe Bay Oil Field, Alaska. Invited paper, "The industrial development of the North and problem of recultivation", Syktyvkar, USSR, July 8-14, 1991.

Walker, D.A., and M.D. Walker. 1991. Hierarchical GIS for analyzing ecosystem processes and climate change in the Alaskan Arctic. Paper presented at the 21st Arctic Workshop, Mesoscale Modeling, Fairbanks, AK, May 16-18, 1991.

Walker, M.D. and D.A. Walker. 1991. Toward a circumpolar vegetation classification system. Paper presented at the 42nd Arctic Science Conference, Circumpolar Modeling of Climate Change, Fairbanks, AK, May 14-15, 1991.

Auerbach, N.A., M. D. Walker, and D.A. Walker. 1991. Road dust disturbance in arctic tundra soils and vegetation, Alaska, USA. Paper presented at the 42nd Arctic Science Conference, Circumpolar Modeling of Climate Change, Fairbanks, AK, May 14-15, 1991.

Walker, D.A., N.D. Lederer, L.R. Lestak, E. Binnian, and E.A. Nordstrand. 1991. Prudhoe Bay Oil Field, Arco Base Camp, Geobotany and Cumulative Impacts. Poster presented at the 11th Annual ESRI User's Conference, Palm Springs, CA, May 20-25, 1991.

Auerbach, N.A. M. D. Walker, D.A. Walker and St. Randolph. 1991. Effects of road dust dusturbance in arctic tundra. Poster presented at the 11th Annual ESRI User's Conference, Palm Springs, CA, May 20-25, 1991.

Walker, D.A., M. D. Walker, L.R. Lestak, K.R. Everett, P.J. Webber. 1991. Application of geographic information systems to the problem of cumulative impacts in the Prudhoe Bay Oil Field, Alaska. Invited paper, "The industrial development of the North and problem of recultivation", Syktyvkar, USSR, July 8-14, 1991.

Walker, D.A., 1990. Loess ecosystems in northern Alaska. Paper presented at the 75th Annual Ecological Society of America Meeting, Snowbird UT, 29 Jul - 2 Aug 1990.

Auerbach, N.A., M. D. Walker, D.A. Walker, and L. Lestak. 1990. Cumulative impact of road dust on arctic tundra: interactions among species composition, dust chemistry, and soil pH. Poster presented at the 19th annual Arctic Workshop, Boulder, CO, March 8-10, 1990.

Walker, D.A., M. D. Walker, S.T. Randolph, and N.D. Lederer. 1990. Hierarchical GIS examining long-term landscape change at multiple scales in the Arctic Foothills, Alaska. 19th Annual Arctic Workshop, INSTAAR, University of Colorado, Boulder, CO, 8-10 March 1990. (Other versions of the poster were presented at the University of Colorado Faculty Symposium on Global Change, University of Colorado, Boulder, CO, 13-14 September 1990, the 1990 International ESRI Users's Conference. Palm Springs, CA. 14-18 May 1990, and the Long-Term Ecological Research Program All Scientist Meeting, Estes Park, CO, 26-29 Sep 1990.)

Walker, D.A., J.C. Halfpenny, L.D. Lederer, M. D. Walker, L. Ayers, and C.A. Wessman. 1989. A hierarchical GIS to examine long-term snow-biosystem interactions in the Colorado alpine. Poster presented at the 1989 ESRI Users Conference, Palm Springs, CA, May 22-26, 1989. (Third place in the Analytical Division of the Poster Competition)

Wessman, C.A., L. Ayers, D.A. Walker. 1989. Remotely sensed pattern to system process in the Front Range. Poster presented at the 1989 program review for the Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO , June 8, 1989. (First place in Environmental Chemistry and Biology Division of the Poster Competition).

Walker, D.A., L.M. Ayers, N.Caine, J.C. Halfpenny, N.D. Lederer, M. D. Walker, and C.A. Wessman. 1989. GIS methods for detecting long-term change in the Colorado alpine. Paper presented at the Fourth annual Landscape Ecology Symposium, Fort Collins, CO, 15-18 March, 1989.

*Walker, D.A., 1989. Cumulative impacts in northern Alaska. Sigma Xi, University of Colorado. February 7, 1989.

*Walker, D.A., 1989. Loess ecosystems of northern Alaska. The Ecosystem Center, Marine Biological Laboratory, Woods Hole, Mass. May 17, 1989.

*Walker, D.A., 1989. A hierarchical approach to analyzing landscape change. Colorado State University. LTER GIS training session, September 23, 1989.

Wessman, C.A., D.A. Walker, and M.D. Walker. 1989. Remotely sensed pattern to process in the Front Range alpine. Paper presented at the Fourth annual Landscape Ecology Symposium, Fort Collins, CO, 15-18 March, 1989.

Walker, D.A., 1989. A hierarchical GIS approach to examine natural and anthropogenic disturbance in the Alaskan Arctic. Paper presented at the the Arctic Division of the AAAS, Fairbanks, September, 1989.

Walker, M.D., D.A. Walker, and W. Acevedo. 1988. Comparison of community and regional ordinations in the northern Brooks Range Foothills. Paper presented at the 3rd Annual Landscape Ecology Symposium, Albuquerque, NM, 16-19 Mar 1988.

Walker, D.A., M. D. Walker, and N.D. Lederer. 1988. Terrain and vegetation classification of the DOE R4D Imnavait Creek site. Poster presented at the 17th Annual Arctic Workshop, Boulder CO, 14-16 Apr 1988.

Walker, D.A., B.M. Evans, and C. Benson. 1988. An R4D geographic information system. Poster presented at the 17th Annual Arctic Workshop, Boulder CO, 14-16 Apr 1988.

Walker, D.A., C. Benson, B.M. Evans. 1988. Application of GIS to spatial analysis of terrain-snow-vegetation interactions. Poster presented at the 17th Annual Arctic Workshop, Boulder, CO, 14-16 Apr 1988.

Walker, M.D., D.A. Walker, and W. Acevedo. 1988. Vegetation and environmental interactions at two scales on the North Slope of Alaska. Poster presented at 17th Annual Arctic Workshop, Boulder, CO, 14-16 Apr 1988.

Walker, M.D. and D.A. Walker. 1987. Importance of landscape focal points in maintaining regional diversity: a case study of the northern Alaskan pingos. Abstract and paper, 2nd Annual Symposium, Regional Association, International Association for Landscape Ecology, Charlottesville, NA, 9-11 March, 1987.

Evans, B.A., D. Walker, C. Benson, G.W. Petersen, P.J. Webber, R.L. Day and E. Nordstrand. 1987. Use of multilayer digital database to determine interrelationships between landform geometry, vegetation and climate in an arctic foothills landscape. Paper presented at Ecological Society of America Meeting, Columbus, Ohio, 9-13 August 1987.

*Walker, D.A., 1986. Cumulative impacts in the wetlands of northern Alaska. NASA-Ames, Moffett Field, California, April 15, 1986.

*Walker, D.A., 1986. Use of GIS Technology for examining cumulative impacts in the Prudhoe Bay Oilfield. North Slope Borough, Barrow Alaska, August 22, 1986.

*Walker, D.A., 1986. Vegetation and Ecology of Northern Alaska. Denver Museum of Natural History.

Webber, P.J. and D.A. Walker. 1986. Cumulative impacts and the spread of disturbance in permafrost dominated lands. Paper presented at the Seventh Conference of the Comit� Arctique International. (Restoration and Vegetation Succession in Circumpolar Lands), Rejkavik, Iceland, September 7-13, 1986.

Walker, D.A., 1986. An automated mapping approach for geobotanical maps of the DOE R4D research site near Toolik Lake, Alaska. Poster presented at the 15th Annual Arctic Workshop, Institute of Arctic and Alpine Research, April 24-26, 1986.

Walker, D.A., 1986. Roadside vegetation changes due to dust. Dalton Highway and Prudhoe Bay Spine Road, Alaska. Poster and abstract presented at the Seventh Conference of the Comit� Arctique International (Restoration and Vegetation Succession in Circumpolar Lands), Rejkavik, Iceland, September 7-13, 1986.

Walker, M.D. and D.A. Walker. 1986. Soil and vegetation succession on pingos, central arctic coastal plain, Alaska. Poster and abstract presented at the Seventh Conference of the Comit� Arctique International (Restoration and Vegetation Succession in Circumpolar Lands), Rejkavik, Iceland, September 7-13, 1986.

Slaughter, C.W., L.A. Johnson, C.H. Racine, D.A. Walker and G. Abele.1986. Environmental response to off-road vehicle (ORV) use in permafrost affected landscapes. Poster and abstract presented at the Seventh Conference of the Comit� Arctique International (Restoration and vegetation succession in circumpolar lands), Rejkavik, Iceland. September 7-13, 1986.

Walker, D.A., M. D. Walker, K.R. Everett and P.J. Webber. 1984. The puzzling pingos of Prudhoe Bay. Poster and abstract presented at the 13th Annual Arctic Workshop. Institute of Arctic and Alpine Research. University of Colorado, Boulder, March 15-17. p. 30-31.

Walker, D.A., W. Acevedo and P.J. Webber. 1982. A LANDSAT classification and vegetation map of the northern portion of the Arctic National Wildlife Refuge, Alaska. Poster and abstract presented at the 11th Annual Arctic Workshop, Institute of Arctic and Alpine Research, University of Colorado, Boulder, March 11-13, 1982, p. 78.

Klinger, L.F., D.A. Walker and P.J. Webber. 1982. The effects of a gravel road on arctic coastal plain tundra. Poster and abstract presented at the 11th Annual Arctic Workshop, Institute of Arctic and Alpine Research, University of Colorado, Boulder. March 11-13, 1982, p. 63.

Simmons, C.L., D.A. Walker and P.J. Webber. 1982. Sensitivity of selected plant communities to sea-water spills, Prudhoe Bay, Alaska. Poster and abstract at the 11th Annual Arctic Workshop, Institute of Arctic and Alpine Research, University of Colorado, Boulder, March 11-13, 1982, p. 73.

Walker, D.A., P.J. Webber, K.R. Everett and J. Brown. 1981. Geobotanical mapping of the Prudhoe Bay Region, Alaska. Poster and abstract presented to the 19th Annual Arctic Workshop held at the Institute of Arctic and Alpine Research, University of Colorado, Boulder, March 12-14, 1981, p. 84.

Walker, D.A., and P.J. Webber. 1979. Salix lanata spp. richardsonii as a climatic indicator in Northern Alaska. Poster and abstract presented to the Arctic Workshop held at the Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO. 4-5 May 1979, 1 p.

Webber, P.J., D.A. Walker and V. Kom�rkov�. 1976. Large scale mapping of Alaskan tundra vegetation. Paper presented at the 27th Alaska Science Conference, 4-7 August, Fairbanks, AK.

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Other reports and maps to government agencies and consulting firms:

Vonlanthen, C., M.K. Raynolds, C. Munger, A. Kade, and D.A. Walker. 2006. Data report: Biocomplexity of patterned ground, Isachsen Expedition, July 2005. Alaska Geobotany Center, University of Alaska Fairbanks. Data Report, 86 pp.

Barreda, J.E., J. Knudson, D.A. Walker, M.K. Raynolds, A. Kade, and C. Munger. 2006. Biocomplexity of patterned ground data report, Dalton Highway, 2001-2005. Alaska Geobotany Center, University of Alaska Fairbanks. Data Report, 224 pp.

Munger, C.A., M.K. Raynolds, and D.A. Walker. 2004. July 2003 Banks Island Expedition: Vegetation, biomass, NDVI, soil, thaw layer, invertebrates, decomposition, biogeochemistry, and turf hummock studies. Alaska Geobotany Center, University of Alaska Fairbanks. Data Report, 72 pp.

Munger, C., M.K. Raynolds, A. Kade and D.A. Walker. 2005. Biocomplexity of patterned ground, Mould Bay Expedition, July 2004 61. Alaska Geobotany Center, University of Alaska Fairbanks. Data Report, 61 pp.

Raynolds, M.K., D.A. Walker, and C.R. Martin. 2004. Biocomplexity of frost-boil ecosystems snow data report, Alaska North Slope, April 2004. Alaska Geobotany Center, University of Alaska Fairbanks. 29 pp.

Raynolds, M.K. and D.A. Walker. 2003. Banks Island July 2003 Field Report. Alaska Geobotany Center, University of Alaska Fairbanks, 19 pp.

Walker, D.A., M.K. Raynolds, and C.R. Martin. 2003. Snow on the Alaska North Slope Grids, April 2003. Alaska Geobotany Center, University of Alaska Fairbanks. Data Report, 28 pp.

Walker, D.A., and Talbot, S.S. 1997. Toward a new circumpolar arctic vegetation map, National Science Foundation, Arctic Research of the United States, NSF 97-119, v. 11, Arlington, Va., p.80-81.

Walker, D.A., S.A. Elias, N.A. Auerbach, and S.K. Short. 1997. Alpine biodiversity, Fort Richardson, Alaska. Department of Defense, Army, Legacy Resource Management Program Project DAMD17-93-J-3038. 66 pp + appendices.

Elias, S.A., S.K. Short, D.A. Walker, and N.A. Auerbach. 1996. Historical biodeiversity, DEW Line Stations, Alaska. Final report to Department of Defense, Air Force, Legacy Resource Management Program Project #0742, 58 pp. + appendices.

Auerbach, N.A., N.G. Moskalenko, and D.A. Walker. 1994. Barrow DEW-Line Station, Alaska, vegetation transect study, 1993. Data report to Department of Defense, Air Force, Legacy Management Program. 37 pp.

Lewis, B.E. and D.A. Walker. 1994. Vegetation survey, Fort Richardson, Alaska, Alpine biodiversity project, 1993. Data report to U.S. Department of Defense, Army, Legacy Resource Management Program. 11 pp.

Walker, D.A., and N.C. Barry. 1991. Toolik Lake permanent vegetation plots: site factors, soil physical and chemical properties, plant species cover, photographs and soil descriptions. Joint Facility for Regional Ecosystem Analysis Data Report. 48 pp. + appendices.

Walker, D.A., 1988. Terrain and vegetation types of the Sagavanirktok Quadrangle. Final report to NASA-Ames Research Center under University Consortium Agreement No. NCA-106, 56 pp.

Walker, M.D., D.A. Walker, and W. Acevedo. 1988. Hierarchical gradient analysis of northern Alaskan landscapes: understanding vegetation-environment interactions at macro- and mesoscales. Final report to NASA Ames Research Center under NASA-Ames University Consortium Agreement NCA2-106, 104 pp.

Walker, D.A., N.D. Lederer and M.D. Walker. 1987. Permanent vegetation plots. Data Report for Department of Energy R4D project. 43 pp + appendices and maps.

Walker, D.A., P.J. Webber, N.D. Lederer and M.D. Walker. 1987. Terrain and vegetation of the Department of Energy R4D research site, Imnavait Creek, Alaska. Draft manuscript, 41 pp + Appendices and maps.

Walker, D.A., and N.D. Lederer. 1987. Toposequence study. Data Report for Department of Energy R4D project. 29 pp + appendices.

Webber, P.J., D.A. Walker, V. Kom�rkov� and J.J. Ebersole. 1985. Baseline monitoring methods of sensitivity analysis of Alaskan arctic tundra. Final report to U.S. Army Cold Regions Research and Engineering Laboratory, (CRREL), Hanover, N.H. 03755.

Walker, D.A., N.D. Lederer and M.D. Walker. 1985. Vegetation changes at permanent transects along the Dalton Highway and the Prudhoe Bay Spine Road. Attachment F. In: Webber, P.J., D.A. Walker, V. Kom�rkov� and J.J. Ebersole, Baseline monitoring methods and sensitivity analysis of Alaskan arctic tundra. Final report to U.S. Army Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H. 03755, 28 p.

Walker, D.A., N.D. Lederer and M.D. Walker. 1985. Observations at the Prudhoe Bay Rolligon Site seven years following the test. Attachment G. In: Webber, P.J., D.A. Walker, V. Kom�rkov� and J.J. Ebersole, Baseline monitoring methods and sensitivity analysis of Alaskan arctic tundra. Final report of U.S. Army Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H. 03755, 19 p.

Walker, D.A., M.D. Walker and N.D. Lederer, 1985. 1983 Observations at the Prudhoe Bay and Franklin Bluffs hydrocarbon spill sites. Attachment H. In: Webber, P.J., D. A. Walker, V. Kom�rkov� and J.J. Ebersole, Baseline monitoring methods and sensitivity analysis of Alaskan arctic tundra. Final report to U.S. Army Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H. 03755. 22 p.

Walker, D.A., and N.D. Lederer. 1985. Summer 1983 observations at the Prudhoe Bay experimental seawater spill sites three years after the spills. Attachment I. In: Webber, P.J., D.A Walker, V. Kom�rkov� and J.J. Ebersole, Baseline monitoring methods and sensitivity analysis of Alaskan arctic tundra. Final report to U.S. Army Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H. 03755. 13 p.

Walker, D.A., 1985. Illustrated surface-form and vegetation legend for geobotanical mapping of the Arctic Coastal Plain of northern Alaska. Report to U.S. Fish and Wildlife Service for the Environmental Protection Agency under interagency agreement no. DE-A106-84RL10584. 70 pp.

Walker, M.D. and D.A. Walker. 1985. The application of detrended correspondence analysis to Landsat-assisted vegetation mapping of the Sagavanirktok Quadrangle, Alaska. Phase I - Ordination of sample sites and vegetation types. Final report to NASA-Ames under consortium agreement no. NCA2-OR170-303. 71 pp.

Walker, D.A., 1985. Terrain and vegetation types of the Sagavanirktok Quadrangle Alaska. Final report to NASA-Ames under consortium agreement no. NCA2-OR170-303. 65 pp.

Walker, D.A., and P.J. Webber. 1985. Vegetation analysis and mapping of the R4D research site. Progress report to the Department of Energy under grant no. DE-FG02-84ER60242. 22 pp + maps.

Walker, D.A., and N.D. Lederer. 1984. 1984 ground reference data in support of the North Slope Borough's mapping effort in northern Alaska. Final Report to the Environmental Systems Research Institute, 380 New York St., Redlands, CA 83 p.

Walker, D.A., M. D. Walker, N.D. Lederer and P.J. Webber. 1984. The use of geobotanical maps and automated mapping techniques to study the historical changes in the Prudhoe Bay oil field, Alaska. Final Report to U.S. Fish and Wildlife Service, Habitat Resources Section, 1011 E. Tudor Ave., Anchorage, AK, 63 p.

Walker, D.A., D. Cate and J. Brown (editors). 1984. Disturbance and recovery of Arctic Alaskan tundra terrain: a summary of recent CRREL Research. Report to U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. 03755. 177 p.

Walker, D.A., K.R. Everett and P.J. Webber. 1983. Chapter 2. Geobotany. In: Troy, D.M. (ed.), Prudhoe Bay Unit--Eileen West End Environmental Studies Program, Summer 1982. Prepared by LGL Research Associates, Inc., Fairbanks, AK, for Sohio Alaska Petroleum Co., Anchorage, AK. p. 2-1 to 2-77.

Klinger, L.F., D.A. Walker, M. D. Walker, and P.J. Webber. 1983. The effects of a gravel road on adjacent tundra vegetation, Prudhoe Bay Waterflood Environmental Monitoring Program. Chapter 6 in Prudhoe Bay Waterflood Pruject Environmental Monitoring Program 1982, Final Report, US Army Corps of Engineers, Alaska District, pp. 6-ii to 6-162.

Moses, T.A. and D.A. Walker. 1983. Chapter 6. Surface hydrology. In: Troy D.M. (ed.), Prudhoe Bay Unit--Eileen West End Environmental Studies Program, Summer, 1982. Prepared by LGL Research Associates, Inc., Fairbanks, AK, for Sohio Alaska Petroleum Co., Anchorage, AK. p. 6-1 to 6-14.

Walker, D.A., and N.D. Lederer. 1983. Vegetation aerial and ground reference data for the Noatak and Kotzebue 1:250,000-scale quadrangles. Report to Environmental Systems Research Institute, 380 New York Street, Redlands, CA. 56 p. + 2 volumes of photographs.

Walker, D.A., P.J. Webber and K.R. Everett. 1983. 1:63,360-scale geobotanical mapping in the Arctic National Wildlife Refuge. Final report to the U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H. 03755 and the U.S. Fish and Wildlife Service, 1011 E. Tudor, Anchorage, AK 99503, 125 pp + 6 maps.

Everett, K.R. and D.A. Walker. 1982. Geobotanical reconnaissance of the SOHIO West (Kuparuk Field). Final Report for Contract No. 81JL71 to SOHIO Alaska Petroleum Co., 99502, 35 pp. plus appendices.

Everett, K.R. and D.A. Walker. 1982. Annotated and illustrated legend to 1981 SOHIO master maps. Final report for Contract No. 81JL70 to SOHIO Alaska Petroleum Co., 99502, 98 pp.

Walker, D.A., K.R. Everett, P.J. Webber and T.A. Moses. 1982. Geobotanical maps and surface hydrology (of the Eileen West End Development, Prudhoe Bay, Alaska). Final report to LGL Research Assoc. Inc., Alaska, 99 pp. plus 25 maps.

Webber, P.J., L.F.Klinger and D.A. Walker. 1982. The effects of a gravel road on arctic coastal plain tundra. Final report to Woodward-Clyde Consultants, Prudhoe Bay Unit Waterflood Monitoring Program, 45 pp. plus appendices.

Everett, K.R. and D.A. Walker. 1981. The landforms, vegetation and soils of the Sagavanirktok River delta region, Prudhoe Bay, Alaska. Final report for Contract No. 81JL71 to SOHIO Alaska Petroleum Co., 99502. 8 pp. plus appendices.

Everett, K.R., D.A. Walker and P.J. Webber. 1981. Prudhoe Bay oilfield geobotanical master map (scale 1:6000). Final report for Contract No. 81JL71 to SOHIO Alaska Petroleum Co., 99502, 23 map sheets.

Simmons, C.L., D.A. Walker, P.J. Webber and K.R. Everett. 1981. Sea-water tolerances of selected tundra plants of Prudhoe Bay, Alaska. Poster and abstract presented at the 10th Annual Arctic Workshop, March 12-14, 1981, INSTAAR, University of Colorado, pp. 80-81.

Simmons, C.L., D.A. Walker and P.J. Webber. 1980. Sea water tolerances of selected vegetation of Prudhoe Bay, Alaska. Progress report to U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H., 29 pp.

Walker, D.A., 1980. Haul road mapping. In: Webber, P.J. Vegetation mapping and response to disturbances in northern Alaska. Progress report to U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL) Hanover, N.H., 29 pp.

Walker, D.A., 1980. Haul road mapping. In: Webber, P.J. Vegetation mapping and response to disturbances in northern Alaska. Progress report to U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H., Contract No. DACA 89-79-C006, 72 pp.

Walker, D.A., K.R. Everett and P.J. Webber. 1980. Vegetation, soil and landform reconnaissance survey in the Kuparuk Oil Field, Report to ARCO Oil and Gas Co., Box 360, Anchorage, AK 99510, 31 pp.

Walker, D.A., and P.J. Webber. 1980. Master maps and ecological data related to potential impacts of Project Waterflood at Prudhoe Bay, Alaska. Final report to Dames and Moore, 800 Cordova St., Anchorage, AK 99501.

Walker, D.A., and P.J. Webber. 1980. Geobotanical mapping of the SOHIO portion of the Prudhoe Bay Oil Field. Progress report to SOHIO Alaska Petroleum Co., Pouch 6-6112, Anchorage, AK 99502, 10 pp.

Walker, D.A., and P.J. Webber. 1980. INSTAAR/USGS/CRREL LANDSAT mapping program. Final report to U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H. under contract No. PODACA 89-79-M-1124, 65 pp.

Walker, D.A., K. Bowman and P.J. Webber. 1979. Summer 1978 observations on Alaskan tundra oil spills and rolligon test sites. U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL). Hanover, N.H. CRREL Internal Report 591, 52 pp.

Walker, D.A., and P.J. Webber. 1979. Report of Yukon River to Prudhoe Bay vegetation mapping program. U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL). Hanover, N.H. CRREL Internal Report 607, 186 pp.

Webber, P.J., V. Kom�rkov�, D.A. Walker and N. Werbe. 1979. Geobotanical studies along a latitudinal gradient between the Yukon River and Prudhoe Bay, Alaska. U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL) Hanover, N.H. CRREL Internal Report 585, 366 pp.

Walker, D.A., K.R. Everett and P.J. Webber. 1977. Observation at the Prudhoe Bay rolligon site one year following the test. Report to U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL), Hanover, N.H., 50 pp.

Walker, D.A., and P.J. Webber. 1976. Vegetation mapping of selected sites along the Yukon River-Prudhoe Bay Haul Road, Alaska. Progress report to U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory (CRREL) Hanover, N.H. 46 pp. plus 10 maps.

Walker, D.A., and P.J. Webber. 1974. Vegetation Map U.S. Tundra Biome Study Area, Barrow, Alaska.

Webber, P.J. and D.A. Walker. 1973. Vegetation maps of the Gas Arctic Test Site, Prudhoe Bay, Alaska. Final Report to Batelle Memorial Institute, Columbus Laboratories, Columbus, Ohio 43210, 6 pp.

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Theses:

Walker, D.A., 1977. The analysis of the effectiveness of a television scanning densitometer for indicating geobotanical features in an ice-wedge polygon complex at Barrow, Alaska. M.A. Thesis, University of Colorado, Boulder, 129 pp. plus 2 maps.

Walker, D.A., 1981. The vegetation and environmental gradients of the Prudhoe Bay region, Alaska. Ph.D. Thesis, University of Colorado, Boulder, 484 pp. plus 5 maps.

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