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Publications

polar bear swimming - photo by USGS

Fact Sheets

Geiselman, J. A., A. R. DeGange, K. L. Oakley, D. V. Derksen, and M. E. Whalen. 2011. Changing Arctic ecosystems - Research to understand and project changes in marine and terrestrial ecosystems of the Arctic. USGS Fact Sheet 2011-3136, 4 p. [Details] [Full Publication]

Oakley, K. L., T. C. Atwood, D. C. Douglas, K. D. Rode, and M. E. Whalen. 2015. Changing Arctic Ecosystems: Updated forecast: Reducing carbon dioxide (CO2) emissions required to improve polar bear outlook. 2015-3042, 2 p. doi:10.3133/fs20153042 [Details] [Full Publication] [PDF file 656 kb]

Oakley, K. L., M. E. Whalen, D. C. Douglas, M. S. Udevitz, T. C. Atwood, and C. V. Jay. 2012. Changing Arctic Ecosystems: Polar bear and walrus response to the rapid decline in Arctic sea ice. USGS Fact Sheet 2012-3131, 4 p. [Details] [Full Publication]

2017

McKinney, M. A., T. C. Atwood, S. J. Iverson, and E. Peacock. 2017. Temporal complexity of southern Beaufort Sea polar bear diets during a period of increasing land use. Ecosphere 8(1):e01633. doi:10.1002/ecs2.1633 [Details] [Full Publication]

Pagano, A. M., K. D. Rode, A. Cutting, M. A. Owen, S. Jensen, J. V. Ware, C. M. Robbins, G. M. Durner, T. C. Atwood, M. E. Obbard, K. R. Middel, G. W. Thiemann, and T. M. Williams. 2017. Using tri-axial accelerometers to identify wild polar bear behaviors. Endangered Species Research 32:19-33. doi:10.3354/esr00779 [Details] [Full Publication]

Olson, J. W., K. D. Rode, D. L. Eggett, T. S. Smith, R. R. Wilson, G. M. Durner, A. S. Fischbach, T. C. Atwood, and D. C. Douglas. 2017. Collar temperature sensor data reveal long-term patterns in southern Beaufort Sea polar bear den distribution on pack ice and land. Marine Ecology Progress Series In Press. [Details] [Full Publication]

2016

Atwood, T. C., B. G. Marcot, D. C. Douglas, S. C. Amstrup, K. D. Rode, G. M. Durner, and J. F. Bromaghin. 2016. Forecasting the relative influence of environmental and anthropogenic stressors on polar bears. Ecosphere 11(6):e01370. doi:10.1002/ecs2.1370 [Details] [Full Publication]

Atwood, T. C., E. Peacock, M. A. McKinney, K. Lillie, R. R. Wilson, D. C. Douglas, S. Miller, and P. Terletzky. 2016. Rapid environmental change drives increased land use by an Arctic marine predator. PLoS One 11(6):e0155932. doi:10.1371/journal.pone.0155932 [Details] [Full Publication]

Bromaghin, J. F., S. M. Budge, G. W. Thiemann, and K. D. Rode. 2016. Assessing the robustness of quantitative fatty acid signature analysis to assumption violations. Methods in Ecology and Evolution 7(1):51-59. doi:10.1111/2041-210X.12456 [Details] [Full Publication]

Regehr, E. V., K. L. Laidre, H. R. Akçakaya, S. C. Amstrup, T. C. Atwood, N. J. Lunn, M. E. Obbard, H. Stern, G. W. Thiemann, and Ø. Wiig. 2016. Conservation status of polar bears (Ursus maritimus) in relation to projected sea-ice declines. Biology Letters 12:0160556. doi:10.1098/rsbl.2016.0556 [Details] [Full Publication]

Rode, K. D., C. A. Stricker, C. Erlenbach, C. T. Robbins, S. G. Cherry, S. D. Newsome, A. Cutting, S. Jensen, G. Stenhouse, M. Brooks, A. Hash, and N. Nicassio. 2016. Isotopic incorporation and the effects of fasting and dietary lipid content on isotopic discrimination in large, carnivorous mammals. Physiological and Biochemical Zoology. doi:10.1086/686490 [Details] [Full Publication]

Wilson, R. R., E. V. Regehr, K. D. Rode, and M. St. Martin. 2016. Invariant polar bear habitat selection during a period of sea ice loss. Proceedings of the Royal Society B 283(1836):20160380. doi:10.1098/rspb.2016.0380 [Details] [Full Publication]

2015

Atwood, T. C., B. G. Marcot, D. C. Douglas, S. C. Amstrup, K. D. Rode, G. M. Durner, and J. F. Bromaghin. 2015. Evaluating and ranking threats to the long-term persistence of polar bears. USGS Open-File Report 2014-1254, 114 p. doi:10.3133/ofr20141254 [Details] [Full Publication]

Atwood, T. C., E. Peacock, K. Burek-Huntington, V. Shearn-Bochsler, B. Bodenstein, K. Beckmen, and G. M. Durner. 2015. Prevalence and spatio-temporal variation of an Alopecia Syndrome in polar bears of the Southern Beaufort Sea. Journal of Wildlife Diseases 51(1):48-59. doi:10.7589/2013-11-301 [Details] [Full Publication]

Atwood, T. C., E. Peacock, K. Lillie, R. R. Wilson, and S. Miller. 2015. Demographic composition and behavior of polar bears summering on shore in Alaska. USGS Administrative Report. [Details] [Full Publication]

Bowen, L., A. K. Miles, J. L. Stott, S. Waters, and T. C. Atwood. 2015. Enhanced biological processes associated with alopecia in polar bears (Ursus maritimus). Science of the Total Environment 529:114-120. doi:10.1016/j.scitotenv.2015.05.039 [Details] [Full Publication]

Bowen, L., A. K. Miles, S. Waters, R. Meyerson, K. D. Rode, and T. C. Atwood. 2015. Gene transcription in polar bears (Ursus maritimus) from disparate populations. Polar Biology. doi:10.1007/s00300-015-1705-0 [Details] [Full Publication]

Bromaghin, J. F., T. L. McDonald, I. Stirling, A. E. Derocher, E. S. Richardson, E. V. Regehr, D. C. Douglas, G. M. Durner, T. C. Atwood, and S. C. Amstrup. 2015. Polar bear population dynamics in the southern Beaufort Sea during a period of sea ice decline. Ecological Applications 25(3):634-651. doi:10.1890/14-1129.1 [Details] [Full Publication]

Durner, G. M. 2015. Using Argos to understand the response of polar bears to a changing arctic. Pages 4-5 in Argos, Monitoring the Impacts of Climate Change. Argos Forum 81, 24 p. [Details] [Full Publication]

Fagre, A., K. A. Patyk, P. Nol, T. C. Atwood, K. Hueffer, and C. Duncan. 2015. A review of infectious agents in polar bears (Ursus maritimus) and their long-term ecological relevance. EcoHealth:1-12. doi:10.1007/s10393-015-1023-6 [Details] [Full Publication]

LaRue, M., S. P. Stapleton, C. Porter, S. N. Atkinson, T. C. Atwood, and N. Lecomte. 2015. Testing methods for using high-resolution satellite imagery to monitor polar bear abundance and distribution. Wildlife Society Bulletin In Press. doi:10.1002/wsb.596 [Details] [Full Publication]

Oakley, K. L., T. C. Atwood, D. C. Douglas, K. D. Rode, and M. E. Whalen. 2015. Changing Arctic Ecosystems: Updated forecast: Reducing carbon dioxide (CO2) emissions required to improve polar bear outlook. 2015-3042, 2 p. doi:10.3133/fs20153042 [Details] [Full Publication] [PDF file 656 kb]

Obbard, M. E., S. P. Stapleton, K. R. Middel, I. Thibault, V. Brodeur, and C. Jutras. 2015. Estimating the abundance of the Southern Hudson Bay polar bear subpopulation with aerial surveys. Polar Biology In Press. doi:10.1007/s00300-015-1737-5 [Details] [Full Publication]

Owen, M. A., R. R. Swaisgood, C. Slocomb, S. C. Amstrup, G. M. Durner, K. S. Simac, and A. P. Pessier. 2015. An experimental investigation of chemical communication in the polar bear. Journal of Zoology 295(1):36-43. doi:10.1111/jzo.12181 [Details] [Full Publication]

Patyk, K. A., C. Duncan, P. Nol, C. Sonne, K. L. Laidre, M. E. Obbard, . Wiig, J. Aars, E. V. Regehr, L. L. Gustafson, and T. C. Atwood. 2015. Establishing a definition of polar bear health to guide research and management activities. Science of the Total Environment 514:371-378. doi:10.1016/j.scitotenv.2015.02.007 [Details] [Full Publication]

Peacock, E., S. A. Sonsthagen, M. E. Obbard, A. N. Boltunov, E. V. Regehr, N. Ovsyanikov, J. Aars, S. N. Atkinson, G. K. Sage, A. G. Hope, E. Zeyl, L. Bachmann, D. Ehrich, K. T. Scribner, S. C. Amstrup, S. E. Belikov, E. W. Born, A. E. Derocher, I. Stirling, M. K. Taylor, . Wiig, D. Paetkau, and S. L. Talbot. 2015. Implications of the circumpolar genetic structure of polar bears for their conservation in a rapidly warming Arctic. PLoS One 10(1): e112021. doi:10.1371/journal.pone.0112021 [Details] [Full Publication]

Regehr, E. V., R. R. Wilson, K. D. Rode, and M. C. Runge. 2015. Resilience and riskA demographic model to inform conservation planning for polar bears. USGS Open-File Report 2015-1029, 56 p. doi:10.3133/ofr20151029 [Details] [Full Publication]

Rode, K. D., C. T. Robbins, L. Nelson, and S. C. Amstrup. 2015. Can polar bears use terrestrial foods to offset lost ice-based hunting opportunities?. Frontiers in Ecology and the Environment 13:138-145. doi:10.1890/140202 [Details] [Full Publication]

Rode, K. D., R. R. Wilson, E. V. Regehr, M. St. Martin, D. C. Douglas, and J. Olson. 2015. Increased land use by Chukchi Sea polar bears in relation to changing sea ice conditions. PLoS One 10(11):e0142213. doi:10.1371/journal.pone.0142213 [Details] [Full Publication]

Rogers, M. C., E. Peacock, K. S. Simac, M. B. O'Dell, and J. M. Welker. 2015. Diet of female polar bears in the southern Beaufort Sea of Alaska: evidence for an emerging alternative foraging strategy in response to environmental change. Polar Biology. doi:10.1007/s00300-015-1665-4 [Details] [Full Publication]

Ware, J. V., K. D. Rode, A. M. Pagano, J. F. Bromaghin, C. T. Robbins, J. A. Erlenbach, and H. T. Jansen. 2015. Validation of mercury tip-switch and accelerometer activity sensors for identifying resting and active behavior in bears. Ursus 26(2):86-96. doi:10.2192/URSUS-D-14-00031.1 [Details] [Full Publication]

Whiteman, J. P., H. J. Harlow, G. M. Durner, R. Anderson-Sprecher, S. E. Albeke, E. V. Regehr, S. C. Amstrup, and M. Ben-David. 2015. Summer declines in activity and body temperature offer polar bears limited energy savings. Science 349(6245):295-298. doi:10.1126/science.aaa8623 [Details] [Full Publication]

2014

McKinney, M. A., T. C. Atwood, R. Dietz, C. Sonne, S. J. Iverson, and E. Peacock. 2014. Validation of adipose lipid content as a body condition index for polar bears. Ecology and Evolution. doi:10.1002/ece3.956 [Details] [Full Publication]

Rode, K. D., A. M. Pagano, J. F. Bromaghin, T. C. Atwood, G. M. Durner, K. S. Simac, and S. C. Amstrup. 2014. Effects of capturing and collaring on polar bears: Findings from long-term research on the southern Beaufort population. Wildlife Research 41(4):311-322. doi:10.1071/WR13225 [Details] [Full Publication]

Rode, K. D., E. V. Regehr, D. C. Douglas, G. M. Durner, A. E. Derocher, G. W. Thiemann, and S. M. Budge. 2014. Variation in the response of an Arctic top predator experiencing habitat loss: feeding and reproductive ecology of two polar bear populations. Global Change Biology 20(1):76-88. doi:10.1111/gcb.12339 [Details] [Full Publication]

Stapleton, S. P., M. LaRue, N. Lecomte, S. N. Atkinson, D. L. Garshelis, C. Porter, and T. C. Atwood. 2014. Polar bears from space: assessing satellite imagery as a tool to track Arctic wildlife. PLoS One 9(7):e101513. doi:10.1371/journal.pone.0101513 [Details] [Full Publication]

Welch, A. J., O. C. Bedoya-Reina, L. Carretro-Paulet, W. Miller, K. D. Rode, and C. Lindqvist. 2014. Polar bears exhibit genome-wide signatures of bioenergetic adaptation to life in the Arctic environment. Genome Biology and Evolution 6(2):433-450. doi:10.1093/gbe/evu025 [Details] [Full Publication]

2013

Durner, G. M., K. S. Simac, and S. C. Amstrup. 2013. Mapping polar bear maternal denning habitat in the National Petroleum Reserve - Alaska with an IfSAR digital terrain model. Arctic 66(2):197-206. [Details] [Full Publication]

Pagano, A. M., E. Peacock, and M. A. McKinney. 2013. Remote biopsy darting and marking of polar bears. Marine Mammal Science. doi:10.1111/mms.12029 [Details] [Full Publication]

Peacock, E., M. K. Taylor, J. L. Laake, and I. Stirling. 2013. Population ecology of polar bears in Davis Strait, Canada and Greenland. Journal of Wildlife Management 77(3):463-476. doi:10.1002/jwmg.489 [Details] [Full Publication]

Herreman, J. and E. Peacock. 2013. Polar bear use of a persistent food subsidy: Insights from non-invasive genetic sampling in Alaska. Ursus 24(2):148-163. doi:10.2192/URSUS-D-12-00030.1 [Details] [Full Publication]

Vongraven, D., J. Aars, S. C. Amstrup, S. N. Atkinson, S. E. Belikov, E. W. Born, T. D. DeBruyn, A. E. Derocher, G. M. Durner, N. J. Lunn, M. E. Obbard, J. Omelak, N. Ovsynikov, E. Peacock, E. S. Richardson, V. Sahanatien, I. Stirling, and Ø. Wiig. 2012. A circumpolar monitoring framework for polar bears. Ursus 23(sp2):1-66. doi:10.2192/URSUS-D-11-00026.1 [Details] [Full Publication]

2012

Miller, W., S. C. Schuster, A. J. Welch, A. Ratan, O. C. Bedoya-Reina, F. Zhao, H. L. Kim, R. C. Burhans, D. I. Drautz, N. E. Wittenkindt, L. P. Tomsho, E. Ibarra-Laclette, L. Herrera-Estrella, E. Peacock, S. D. Farley, G. K. Sage, K. D. Rode, M. E. Obbard, R. Montiel, L. Bachmann, Ó. Ingólfsson, J. Aars, T. Mailund, Ø. Wiig, S. L. Talbot, and C. Lindqvist. 2012. Polar and brown bear genomes reveal ancient admixture and demographic footprints of past climate change. Proceedings: National Academy of Sciences of USA 109:14295-14296. doi:10.1073/pnas.1210506109 [Details] [Full Publication]

Pagano, A. M., G. M. Durner, S. C. Amstrup, K. S. Simac, and G. S. York. 2012. Long-distance swimming by polar bears (Ursus maritimus) of the southern Beaufort Sea during years of extensive open water. Canadian Journal of Zoology 90:663-676. doi:10.1139/z2012-033 [Details] [Full Publication]

Peacock, E., J. L. Laake, K. L. Laidre, E. W. Born, and S. N. Atkinson. 2012. The utility of harvest recoveries of marked individuals to assess polar bear (Ursus maritimus) survival. Arctic Institute of North America 65(4):391-400. [Details] [Full Publication]

2011

Durner, G. M., J. P. Whiteman, H. J. Harlow, S. C. Amstrup, E. V. Regehr, and M. Ben-David. 2011. Consequences of long-distance swimming and travel over deep-water ice for a female polar bear during a year of extreme sea ice retreat. Polar Biology 34:975-984. doi:10.1007/s00300-010-0953-2 [Details] [Full Publication]

Stirling, I., T. L. McDonald, E. S. Richardson, E. V. Regehr, and S. C. Amstrup. 2011. Polar bear population status in the Northern Beaufort Sea, Canada, 1971-2006. Ecological Applications 21(3):859-876. doi: 10.1890/10-0849.1

Vongraven, D. and E. Peacock. 2011. Development of a pan-Arctic monitoring plan for polar bears: Background paper. Circumpolar Biodiversity Monitoring Programme, CAFF Monitoring Series Report No.1, January 2011, CAFF International Secretariat, Akureyri, Iceland. ISBN 978-9935-431-01-1

2010

Amstrup, S. C., E. T. DeWeaver, D. C. Douglas, B. G. Marcot, G. M. Durner, C. M. Bitz, and D. A. Bailey. 2010. Greenhouse gas mitigation can reduce sea-ice loss and increase polar bear persistence. Nature 468:955-958. doi:10.1038/nature09653 [Details] [Full Publication]

Douglas, D.C. 2010. Arctic sea ice decline: Projected changes in timing and extent of sea ice in the Bering and Chukchi Seas: U.S. Geological Survey Open-File Report 2010-1176, 32p.

Durner, G. M., A. S. Fischbach, S. C. Amstrup, and D. C. Douglas. 2010. Catalogue of Polar Bear (Ursus maritimus) Maternal Den Locations in the Beaufort Sea and Neighboring Regions, Alaska, 1910-2010. USGS Data Series 568. [Details] [Full Publication]

Hunter, C.M., H. Caswell, M.C. Runge, E.V. Regehr, S.C. Amstrup, and I. Stirling. 2010. Climate change threatens polar bear populations: A stochastic demographic analysis. Ecology 91:2883-2897.

Kirk, C. M., S. Amstrup, R. Swor, D. Holcomb and T. M. O’Hara. 2010. Hematology of Southern Beaufort Sea polar bears (2005‐2007): Biomarker for an Arctic Ecosystem Health Sentinel. EcoHealth DOI: 10.1007/s10393‐010‐0322‐1.

Kirk, C. M., S. Amstrup, R. Swor, D. Holcomb and T. M. O’Hara. 2010. Morbillivirus and Toxoplasma exposure and association with hematological parameters for southern Beaufort Sea polar bears: Potential response to infectious agents in a sentinel species. Ecohealth DOI: 10.1007/s10393‐010‐0323‐0.

Obbard, M. E., Thiemann, G. W., Peacock, E., and DeBruyn, T. D. (eds) (2010). Polar Bears: Proceedings of the 15th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, Copenhagen, Denmark, 29 June–3 July 2009. Gland, Switzerland and Cambridge, UK: IUCN. vii + 235 pp.

Rode, K. D., S. C. Amstrup, and E. V. Regehr. 2010. Reduced body size and cub recruitment in polar bears associated with sea ice decline. Ecological Applications. 20(3):768-782. doi: 10.1890/08-1036.1

2009

Regehr, E. V., C. M. Hunter, H. Caswell, S. C. Amstrup, and I. Stirling. 2009. Survival and breeding of polar bears in the southern Beaufort Sea in relation to sea ice. Journal of Animal Ecology. doi: 10.1111/j.1365-2656.2009.01603.x

Durner, G. M., D. C. Douglas, R. M. Nielson, S. C. Amstrup, T. L. McDonald, I. Stirling, M. Mauritzen, E. W. Born, Ø. Wiig, E. T. DeWeaver, M. C. Serreze, S. E. Belikov, M. M. Holland, J. Maslanik, J. Aars, D. A. Bailey, and A. E. Derocher. 2009. Predicting 21st-century polar bear habitat distribution from global climate models. Ecological Monographs 79(1):25-58. doi:10.1890/07-2089.1 [Details] [Full Publication]

2008

Amstrup, S. C., B. G. Marcot, and D. C. Douglas. 2008. A Bayesian network modeling approach to forecasting the 21st century worldwide status of polar bears. Pages 213-268 in Eric. T. DeWeaver, Cecilia M. Bitz, and L.-Bruno Tremblay Eds. Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications. Geophysical Monograph Series [Details] [Full Publication]

2007

Bentzen, T. W., E. H. Follmann, S. C. Amstrup, G. S. York, M. J. Wooller, and T. M. O’Hara. 2007. Variation in winter diet of southern Beaufort Sea polar bears inferred from stable isotope analysis. Canadian Journal of Zoology. 85(5): 596–608.

Fischbach, A. S., S. C. Amstrup, and D. C. Douglas. 2007. Landward and eastward shift of Alaskan polar bears denning associated with recent sea ice changes. Polar Biology 30:1395-1405. doi:10.1007/s00300-007-0300-4 [Details] [Full Publication]

Regehr, E. V., N. J. Lunn, S. C. Amstrup, and I. Stirling. 2007. Effects of earlier sea ice breakup on survival and population size of polar bears in western Hudson Bay. Journal of Wildlife Management. 71(8):2673-2683.

Regehr, E. V., N. J. Lunn, S. C. Amstrup, and I. Stirling. 2007. Supplemental materials for the analysis of capture-recapture data for polar bears in western Hudson Bay, Canada, 1984-2004. U. S. Geological Survey Data Series 304. 13 p.

Smith, T. S., S. T. Partridge, S. C. Amstrup, and S. Schliebe. 2007. Post-den emergence behavior of polar bears (Ursus maritimus) in Northern Alaska. Arctic. 60(2)187-194.

2006

Amstrup, S. C. 2006. Future for polar bears in a declining sea ice environment: What do we know? International Bear News 15(4):8-11.

Amstrup, S. C., G. M. Durner, T. L. McDonald, and W. R. Johnson. 2006. Estimating potential effects of hypothetical oil spills on polar bears. U. S. Geological Survey, Alaska Science Center, Anchorage. Final Report to U. S. Minerals Management Service. 57 pp.

Amstrup, S. C., I. Stirling, T. S. Smith, C. Perham, and G. W. Thiemann. 2006. Recent observations of intraspecific predation and cannibalism among polar bears in the southern Beaufort Sea. Polar Biology 29(11):997-1002.

Cronin, M. A., S. C. Amstrup, and K. T. Scribner. 2006. Microsatellite DNA and mitochondrial DNA variation in polar bears (Ursus maritimus) from the Beaufort and Chuckchi seas, Alaska. Canadian Journal of Zoology 84(5):655-660.

Durner, G. M., S. C. Amstrup, and K. J. Ambrosius. 2006. Polar bear maternal den habitat on the Arctic National Wildlife Refuge, Alaska. Arctic 59(1):31-36. [Details] [Full Publication]

Durner, G. M., S. C. Amstrup, G. S. York, E. V. Regehr, K. S. Simac, T. S. Smith, S. T. Partridge, T. Bentzen, K. S. Amstrup, and D. C. Douglas. 2006. Polar bear research in Alaska.  Pages 77-100 in J. Aars, N. J. Lunn, and A. E. Derocher, Editors. Proceedings of the 14th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 20-24 June 2005, Seattle, Washington. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 32. 198 pp.

Durner, G. M., D. C. Douglas, R. M. Nielson, and S. C. Amstrup. 2006. Model for autumn pelagic distribution of adult female polar bears in the Chukchi Seas, 1987-1994. U. S. Geological Survey, Alaska Science Center, Anchorage. Final Report to U. S. Fish and Wildlife Service for Contract 70181-5-C240. 67 pp. [PDF file 1.62 MB]

Regehr, E. V., S. C. Amstrup, and I. Stirling. 2006. Polar Bear Population Status in the Southern Beaufort Sea. U. S. Geological Survey, Alaska Science Center, Anchorage. Open-File Report 1337. 30 pp.

2005

Amstrup, S. C., G. M. Durner, E. V. Regehr, G. S. York, K. S. Simac, T. S. Smith, S. T. Partridge, and D. C. Douglas. 2005. Polar bear research in the Beaufort Sea. In Proceedings of the Canadian Polar Bear Technical Committee, 7-9 Feb 2005, Edmonton, Canada.

Amstrup, S. C., G. M. Durner, I. Stirling, and T. L. McDonald. 2005. Allocating harvests among polar bear stocks in the Beaufort Sea. Arctic 58(3):247-259.

Amstrup, S. C., T. L. McDonald, and B. F. J. Manly (Editors). 2005. Handbook of Capture-Recapture Analysis. Princeton University Press, New Jersey. 296 pp.

Belchansky, G. I., D. C. Douglas, V. A. Eremeev, and N. G. Platonov. 2005. Variations in the Arctic's multiyear sea ice cover: A neural network analysis of SMMR-SSM/I data, 1979-2004. Geophysical Resource Letter 32(9):L09605. doi:10.1029/2005GL022395 [Details] [Full Publication]

Belchansky, G. I., D. C. Douglas, and N. G. Platonov. 2005. Spatial and temporal variations in the age structure of Arctic sea ice. Geophysical Resource Letter 32:L18504. doi:10.1029/2005GL023976 [Details] [Full Publication]

Manly, B. F. J., S. C. Amstrup, and T. L. McDonald. 2005. Capture-recapture methods in practice. Pages 266-275 in S. C. Amstrup, T. L. McDonald, and B. F. J. Manly, Editors. Handbook of Capture-Recapture Analysis. Princeton University Press, New Jersey, 296 pp.

Manly, B. F. J., T. L. McDonald, and S. C. Amstrup. 2005. Introduction to the handbook. Pages 1-21 in S. C. Amstrup, T. L. McDonald, and B. F. J. Manly, Editors. Handbook of Capture-Recapture Analysis. Princeton University Press, New Jersey, 296 pp.

McDonald, T. L., S. C. Amstrup, E. V. Regehr, and B. F. J. Manly. 2005 . Examples. Pages 196-265 in S. C. Amstrup, T. L. McDonald, and B. F. J. Manly, Editors. Handbook of Capture-Recapture Analysis. Princeton University Press, New Jersey, 296 pp.

Rah, H., B. B. Chomel, E. H. Follmann, R. W. Kasten, C. H. Hew, T. B. Farver, G. W. Garner, and S. C. Amstrup. 2005. Serosurvey of selected zoonotic agents in polar bears (Ursus maritimus). Veterinary Record 156(1):7-13.

Stone, R. S., D. C. Douglas, G. I. Belchansky, and S. D. Drobot. 2005. Correlated declines in Pacific arctic snow and sea ice cover. Arctic Research of the United States 19(1):18-25. http://www.nsf.gov/pubs/2005/nsf0539/nsf0539_5.pdf

Stone, R. S., D. C. Douglas, G. I. Belchansky, and S. D. Drobot. 2005. Polar Climate: Arctic sea ice. Pages 39-41 in D. H. Levinson, (ed.). State of the Climate in 2004. Bulletin of the American Meteorological Society 86(6), 86 p. http://www.ncdc.noaa.gov/oa/climate/research/2004/ann/annsum.pdf

Stone, R. S., D. C. Douglas, G. I. Belchansky, S. D. Drobot, and J. Harris. 2005. Cause and effect of variations in western Arctic snow and sea ice cover. Proceedings: American Meteorological Society 8th Conference on Polar Oceanography and Meteorology, 9-13 January. San Diego, CA, USA. http://ams.confex.com/ams/pdfpapers/84856.pdf

2004

Amstrup, S. C., G. M. Durner, E. V. Regehr, G. S. York, K. S. Simac, T. S. Smith, S. T. Partridge, and D. C. Douglas. 2004. Polar bear research in the Beaufort Sea. In Proceedings of the Canadian Polar Bear Technical Committee, 15-17 Feb 2004, Winnipeg, Canada.

Amstrup, S. C., T. L. McDonald, and G. M. Durner. 2004. Using satellite radiotelemetry data to delineate and manage wildlife populations. Wildlife Society Bulletin 32(3):661-679.

Amstrup, S. C., G. S. York, T. L. McDonald, R. M. Nielson, and K S. Simac. 2004. Detecting denning polar bears with forward-looking infrared (FLIR) imagery. BioScience 54(4):337-344.

Belchansky, G. I., D. C. Douglas, I. V. Alpatsky, and N. G. Platonov. 2004. Spatial and temporal multiyear sea ice distributions in the Arctic: A neural network analysis of SSM/I data, 1988-2001. Journal of Geophysical Research 109:C10017. doi:10.1029/2004JC002388 http://dx.doi.org/10.1029/2004JC002388

Belchansky, G. I., D. C. Douglas, I. N. Mordvintsev, and N. G. Platonov. 2004. Estimating the time of melt onset and freeze onset over Arctic sea-ice area using active and passive microwave data. Remote Sensing of Environment 92:21-39. doi:10.1016/j.rse.2004.05.001 http://dx.doi.org/10.1016/j.rse.2004.05.001

Belchansky, G. I., D. C. Douglas, and N. G. Platonov. 2004. Duration of the Arctic sea ice melt season: Regional and interannual variability, 1979-2001. Journal of Climate 17(1):67-80. doi:10.1175/1520-0442(2004)017<0067:DOTASI>2.0.CO;2 http://dx.doi.org/10.1175/1520-0442(2004)017<0067:DOTASI>2.0.CO;2

Durner, G. M., S. C. Amstrup, R. M. Nielson, and T. L. McDonald. 2004. Use of sea ice habitat by female polar bears in the Beaufort Sea. U. S. Geological Survey, Alaska Science Center, Anchorage. Report to U. S. Minerals Management Service for OCS Study 014.

Durner, G. M., S. C. Amstrup, R. M. Nielson, and T. L. McDonald. 2004. Using discrete choice modeling to generate resource selection functions for female polar bears in the Beaufort Sea.  Pages 107-120 in S. Huzurbazar, Editor. Resource Selection Methods and Applications, Proceedings of the First Conference on Resource Selection Modeling, Jan 2003, Laramie, Wyoming.

Schliebe, S. L., and T. S. Smith. 2004. Many are cold, but a few were frozen. U. S. Fish and Wildlife Service Alaska Reflections 16(2):6-8.

Stone, R. S., G. I. Belchansky, S. D. Drobot, and D. C. Douglas. 2004. Diminishing sea ice in the western Arctic Ocean. Bulletin of the American Meteorological Society 85(6):S32-S33.

York, G. S., S. C. Amstrup, and K. S. Simac. 2004. Using Forward Looking Infrared (FLIR) Imagery to detect polar bear maternal dens. Operations Manual. U. S. Geological Survey, Alaska Science Center, Anchorage. Report to U. S. Minerals Management Service for OCS Study 062.

2003

Amstrup, S. C. 2003. Polar bear, Ursus maritimus. Pages 587-610 in G. A. Feldhamer, B. C. Thompson, and J. A. Chapman, Editors. Wild Mammals of North America: Biology, Management, and Conservation. Johns Hopkins University Press, Baltimore, Maryland.

Amstrup, S. C., G. M. Durner, A. S. Fischbach, G. S. York, K. S. Simac, T. S. Smith, S. T. Partridge, and D. C. Douglas. 2003. Polar bear research in the Beaufort Sea. In Proceedings of the Canadian Polar Bear Technical Committee, Feb 2003, Edmonton, Canada.

Amstrup, S. C., G. S. York, T. L. McDonald, R. M. Nielson, K. S. Simac, and G. M. Durner. 2003. Detecting denning polar bears with forward looking infra-red imagery (FLIR).  Page 59 in Proceedings of the Ninth MMS Information Transfer Meeting. U. S. Minerals Management Service, Anchorage, Alaska. Report for OCS Study 042. 118 pp.

Durner, G. M., S. C. Amstrup, and A. S. Fischbach. 2003. Habitat characteristics of polar bear terrestrial maternal den sites in northern Alaska. Arctic 56(1):55-62.

Durner, G. M., S. C. Amstrup, R. M. Nielson, and T. L. McDonald. 2003. Use of sea ice habitat by female polar bears in the Beaufort Sea.  Pages 60-61 in Proceedings of the Ninth MMS Information Transfer Meeting. U. S. Minerals Management Service, Anchorage, Alaska. Report for OCS Study 042. 118 pp.

Evans, T. J., A. S. Fischbach, S. Schliebe, B. Manly, S. B. Kalxdorff, and G. S. York. 2003. Polar bear aerial survey in the eastern Chukchi Sea: A pilot study. Arctic 56(4):356-366.

Kern, J. W., T. L. McDonald, S. C. Amstrup, G. M. Durner, and W. P. Erickson. 2003. Using the bootstrap and fast Fourier transform to estimate confidence intervals of 2-D kernel densities. Environmental Ecology and Statistics 10(4):405-418.

Lie, E., A. Bernhoft, F. Riget, S. E. Belikov, A. N. Boltunov, A. E. Derocher, G. W. Garner, O. Wiig, and J. U. Skaare. 2003. Geographical distribution of organochlorine pesticides (OCPs) in polar bears (Ursus maritimus) in the Norwegian and Russian Arctic. Science of the Total Environment 306(1-3):159-170.

Manly, B. F. J., T. L. McDonald, S. C. Amstrup, and E. V. Regehr. 2003. Improving size estimates of open animal populations by incorporating information on age. BioScience 53(7):666-669.

McDonald, T. L., S. C. Amstrup, and B. F. J. Manly. 2003. Tag loss can bias Jolly-Seber capture-recapture estimates. Wildlife Society Bulletin 31(3):814-822.

York, G. S. 2003. USGS Alaska tissue archival projects: An update on FY02 activities.  Pages 64-65 in Proceedings of the Ninth MMS Information Transfer Meeting. U. S. Minerals Management Service, Anchorage, Alaska. Report for OCS Study 042. 118 pp.

2002

Amstrup, S. C. 2002. Polar bears. Pages 65-70 in D. C. Douglas, P. E. Reynolds, and E. B. Rhode, Editors. Arctic Refuge Coastal Plain Terrestrial Wildlife Research Summaries. U. S. Geological Survey, Alaska Science Center, Anchorage. Biological Science Report 0001. 75 pp.

Amstrup, S. C., G. M. Durner, A. S. Fischbach, K. S. Simac, and G. S. York. 2002. Polar bear research in the Beaufort Sea.  Pages 109-126 in N. J. Lunn, S. Schliebe, and E. W. Born, Editors. Proceedings of the 13th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 23-28 June 2001, Nuuk, Greenland. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 26.

Belchansky, G. I., and D. C. Douglas. 2002. Seasonal comparisons of sea ice concentration estimates derived from SSM/I, OKEAN and RADARSAT data. Remote Sensing of the Environment 81:67-81.

Brower, C. D., A. Carpenter, M. L. Branigan, W. Calvert, T. J. Evans, A. S. Fischbach, J. A. Nagy, S. Schliebe, and I. Stirling. 2002. Polar bear management agreement for the southern Beaufort Sea: An evaluation of the first ten years of a unique conservation agreement. Arctic 55(4):362-372.

Douglas, D. C., P. E. Reynolds, and E. B. Rhode. 2002. Arctic Refuge Coastal Plain Terrestrial Wildlife Research Summaries. U. S. Geological Survey, Alaska Science Center, Anchorage. Biological Science Report 0001. 75 pp.

Durner, G. M., S. C. Amstrup, A. S. Fischbach, G. S. York, and K. S. Simac. 2002. Polar bear research in the Beaufort Sea. In Proceedings of the Canadian Polar Bear Technical Committee, 9-10 Feb 2002, Iqualuit, Canada.

Kucklick, J. R., W. Struntz, P. R. Becker, G. S. York, and J. E. Bohonowych. 2002. Persistent organochlorine pollutants in ringed seals and polar bears collected from northern Alaska. Science of the Total Environment 287(1-2):45-49.

Mauritzen, M., A. E. Derocher, O. Wiig, S. E. Belikov, A. N. Boltunov, E. Hansen, and G. W. Garner. 2002. Using satellite telemetry to define spatial population structure in polar bears in the Norwegian and western Russian Arctic. Journal of Applied Ecology 39(1):79-90.

Schliebe, S. L., J. W. Bridges, T. J. Evans, S. B. Kalxdorff, A. S. Fischbach, and L. J. Lierheimer. 2002. Polar bear management in Alaska 1997-2000.  Pages 89-108 in N. J. Lunn, S. Schliebe, and E. W. Born, Editors. Proceedings of the 13th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 23-28 June 2001, Nuuk, Greenland. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 26.

Young, D. D.Jr, T. R. McCabe, R. Ambrose, G. W. Garner, G. J. Weiler, H. V. Reynolds, M. S. Udevitz, D. J. Reed, and B. Griffith. 2002. Predators. Pages 51-53 in D. C. Douglas, P. E. Reynolds, and E. B. Rhode, Editors. Arctic Refuge Coastal Plain Terrestrial Wildlife Research Summaries. U. S. Geological Survey, Alaska Science Center, Anchorage. Biological Science Report 0001. 75 pp.

2001

Amstrup, S. C. 2001. Polar bear den research in the Beaufort Sea.  Page 55 in Proceedings of the Eighth Alaska OCS Information Transfer Meeting. U. S. Minerals Management Service, Anchorage, Alaska.

Amstrup, S. C., G. M. Durner, T. L. McDonald, D. M. Mulcahy, and G. W. Garner. 2001. Comparing movement patterns of satellite-tagged male and female polar bears. Canadian Journal of Zoology 79(12):2147-2158.

Amstrup, S. C., T. L. McDonald, and I. Stirling. 2001. Polar bears in the Beaufort Sea: A 30-year mark-recapture case history. Journal of Agricultural Biological and Environmental Statistics 6(2):221-234.

Andersen, M., E. Lie, A. E. Derocher, S. E. Belikov, A. Bernhoft, A. N. Boltunov, G. W. Garner, J. U. Skaare, and O. Wiig. 2001. Geographic variation of PCB congeners in polar bears (Ursus maritimus) from Svalbard east to the Chukchi Sea. Polar Biology 24(4):231-238.

Durner, G. M., S. C. Amstrup, and K. J. Ambrosius. 2001. Remote identification of polar bear maternal den habitat in northern Alaska. Arctic 54(2):115-121.

Durner, G. M., S. C. Amstrup, T. L. McDonald, C. Smith, and W. Johnson. 2001. Predicting the numbers of polar bears impacted by oil spills. In Proceedings of the 14th Biennial Conference on the Biology of Marine Mammals, 28 Nov - 3 Dec 2001, Vancouver, Canada.

McDonald, T. L., and S. C. Amstrup. 2001. Estimation of population size using open capture-recapture models. Journal of Agricultural Biological and Environmental Statistics 6(2):206-220.

Simac, K., S. Amstrup, G. Weston York, T. McDonald, G. Durner, and A. Fischbach. 2001. Forward looking infrared (FLIR): a new method for detecting maternal polar bear dens. Society for Marine Mammalogy, Abstracts, 14th BiennialConference on the Biology of Marine Mammals, November 28 – December 3, 2001, Vancouver, B. C., Canada.

York, G. S., P. R. Becker, and L. K. Thorsteinson. 2001. Alaska Marine Mammal Tissue Archival Project. In Alaska Forum on the Environment Anchorage, Alaska.

2000

Amstrup, S. C. 2000. Polar bear. Pages 133-157 in J. J. Truett, Editor. Natural History of an Arctic Oil Field: Development and Biota. Academic Press, San Diego, California.

Amstrup, S. C. 2000. Polar bear research in the Beaufort Sea.  Page 10 in Proceedings of the Beaufort Sea Information Update Meeting, 28-29 Mar 2000, Barrow, Alaska. MBC Applied Environmental Sciences, Anchorage, Alaska. Report to U. S. Minerals Management Service for Alaska OCS Region Study 023.

Amstrup, S. C., G. M. Durner, I. Stirling, N. J. Lunn, and F. Messier. 2000. Movements and distribution of polar bears in the Beaufort Sea. Canadian Journal of Zoology 78(6):948-966.

Belchansky, G. I., and D. C. Douglas. 2000. Classification methods for monitoring Arctic sea icea using OKEAN passive/active two-channel microwave data. Remote Sensing of the Environment 73:307-322.

Durner, G. M., S. C. Amstrup, and T. L. McDonald. 2000. Estimating the impacts of oil spills on polar bears. Arctic Research of the United States 14(3-4):33-37.

Garner, G. W., J. F. Evermann, J. T. Saliki, E. H. Follmann, and A. J. McKeirnan. 2000. Morbillivirus ecology in polar bears (Ursus maritimus). Polar Biology 23(7):474-478.

Shields, G. F., D. Adams, G. W. Garner, M. Labelle, J. Pietsch, M. A. Ramsay, C. Schwartz, K. Titus, and S. Williamson. 2000. Phylogeography of mitochondrial DNA variation in brown bears and polar bears. Molecular Phylogenetics and Evolution 15(2):319-326.

York, G. S., S. C. Amstrup, L. K. Thorsteinson, T. K. Rowles, and P. R. Becker. 2000. Alaska Marine Mammal Tissue Archival Project (AMMTAP):  An Arctic environmental monitoring resource.  Page 14 in Proceedings of the Beaufort Sea Information Update Meeting, 28-29 Mar 2000, Barrow, Alaska. MBC Applied Environmental Sciences, Anchorage, Alaska. Report to U. S. Minerals Management Service for Alaska OCS Region Study 023.

1999

Amstrup, S. C. 1999. Polar bear research in the Beaufort Sea.  Page 30 in Focus on the Future - Alaska Environmental Studies. Proceedings of the Seventh Alaska OCS Information Transfer Meeting. U. S. Minerals Management Service, Anchorage, Alaska.

Amstrup, S. C., and G. M. Durner. 1999. Polar bear research in the Beaufort Sea. In Proceedings of the Canadian Polar Bear Technical Committee.

Fischbach, A. S., D. M. Burn, and S. C. Amstrup. 1999. Modeling the southern Beaufort Sea polar bear stock. In Focus on the Future - Alaska Environmental Studies. Proceedings of the Seventh Alaska OCS Information Transfer Meeting. U. S. Minerals Management Service, Anchorage, Alaska.

Garner, G. W., S. C. Amstrup, J. L. Laake, B. F. J. Manly, T. L. McDonald, and D. G. Robertson (Editors). 1999. Marine Mammal Survey and Assessment Methods. A. A. Balkema, Rotterdam, Netherlands. 287 pp.

McDonald, L. L., Garner G.W., and D. G. Robertson. 1999. Comparison of aerial survey procedures for estimating polar bear density: Results of pilot studies in northern Alaska. Pages 37-52 in G. W. Garner, S. C. Amstrup, J. L. Laake, B. F. J. Manly, T. L. McDonald, and D. G. Robertson, Editors. Marine Mammal Survey and Assessment Methods. A. A. Balkema, Rotterdam, Netherlands, 287 pp.

Mulcahy, D. M., and G. W. Garner. 1999. Subcutaneous implantation of satellite transmitters with percutaneous antennas into male polar bears (Ursus maritimus). Journal of Zoo and Wildlife Medicine 30(4):510-515.

Paetkau, D., S. C. Amstrup, E. W. Born, W. Calvert, A. E. Derocher, G. W. Garner, F. Messier, I. Stirling, M. K. Taylor, O. Wiig, and C. Strobeck. 1999. Genetic structure of the world's polar bear populations. Molecular Ecology 8(10):1571-1584.

Schliebe, S. L., T. J. Evans, A. S. Fischbach, and M. A. Cronin. 1999. Using genetics to verify sex of harvested polar bears: Management implications. Wildlife Society Bulletin 27(3):592-597.

York, G. S., P. R. Becker, and L. K. Thorsteinson. 1999. Alaska Marine Mammal Tissue Archival Project. In Focus on the Future - Alaska Environmental Studies. Proceedings of the Seventh Alaska OCS Information Transfer Meeting. U. S. Minerals Management Service, Anchorage, Alaska.

1998

Amstrup, S. C. 1998. Identification of polar bear den habitat in northern Alaska.  Pages 141-145 in A. E. Derocher , G. W. Garner, N. J. Lunn, and O. Wiig, Editors. Proceedings of the 12th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 3-7 Feb 1997, Oslo, Norway. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 19. 159 pp.

Amstrup, S. C. 1998. Polar bear research in the Beaufort Sea.  Pages 131-139 in A. E. Derocher, G. W. Garner, N. J. Lunn, and O. Wiig, Editors. Proceedings of the 12th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 3-7 Feb 1997, Oslo, Norway. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 19. 159 pp.

Amstrup, S. C., and G. M. Durner. 1998. Polar bear research in the Beaufort Sea.  Pages 47-52 in Proceedings of the Canadian Polar Bear Technical Committee.

Amstrup, S. C., T. L. McDonald, and I. Stirling. 1998. Estimating survival rates and population sizes of polar bears with logistic models. In Proceedings of the World Marine Mammal Science Conference.

Arthur, S. M., G. W. Garner, and T. L. Olson. 1998. Identifying and mitigating errors in satellite telemetry of polar bears. Ursus 10:413-419.

Belikov, S. E., G. W. Garner, O. Wiig, A. N. Boltunov, and Y. A. Gorbunov. 1998. Polar bears of the Severnaya Zemlya Archipelago of the Russian Arctic. Ursus 10:33-40.

Derocher, A. E., G. W. Garner, N. J. Lunn, and O. Wiig (Editors). 1998 . Proceedings of the 12th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 3-7 Feb 1997, Oslo, Norway. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 19. 159 pp.

Garner, G. W., S. E. Belikov, M. S. Stishov, O. Wiig, A. A. Boltunov, G. I. Belchansky, D. C. Douglas, L. L. McDonald, D. M. Mulcahy, and S. Schliebe. 1998. Polar bear research in western Alaska, eastern and western Russia 1993-1996.  Pages 125-130 in A. E. Derocher, G. W. Garner, N. J. Lunn, and O. Wiig, Editors. Proceedings of the 12th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, Oslo, Norway. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 19. 159 pp.

Norstrom, R. J., S. E. Belikov, E. W. Born, G. W. Garner, B Malone, S. Olpinski, M. A. Ramsay, S. L. Schliebe, I. Stirling, M. S. Stishov, M. K. Taylor, and O. Wiig. 1998. Chlorinated hydrocarbon contaminants in polar bears from eastern Russia, North America, Greenland, and Svalbard: Biomonitoring of Arctic pollution. Archives of Environmental Contamination and Toxicology 35(2):354-367.

Olson, T. L., G. W. Garner, and S. M. Arthur. 1998. Methodology for maintaining observer independence in aerial strip transect surveys. Ursus 10:421-425.

1997

Amstrup, S. C., and G. M. Durner. 1997. Polar bear research in the Beaufort Sea.  Pages 20-25 in Proceedings of the Canadian Polar Bear Technical Committee.

Scribner, K. T., G. W. Garner, S. C. Amstrup, and M. A. Cronin. 1997. Population and genetic studies of polar bear (Ursus maritimus): A summary of available data and interpretation of results. Pages 191-202 in A. E. Dizon, S. J. Chivers, and W. F. Perrin, Editors. Molecular Genetics of Marine Mammals. Allen Press, Lawrence, Kansas. Society for Marine Mammalogy Special Publication 3, 388 pp.

1996

Amstrup, S. C., and G. M. Durner. 1996. Polar bear research in the Beaufort Sea.  Pages 16-22 in Proceedings of the Canadian Polar Bear Technical Committee.

Arthur, S. M., B. F. J. Manly, L. L. McDonald, and G. W. Garner. 1996. Assessing habitat selection when availability changes. Ecology 77(1):215-227.

Belchansky, G. I., I. N. Mordvintsev, and D. C. Douglas. 1996. Assessing variability and trends in Arctic sea ice distribution using satellite data.  Pages 642-644 In Remote Sensing for a Sustainable Future.  Proceedings of the International Geoscience and Remote Sensing Symposium, 27-31 May 1996, Lincoln, Nebraska. Institute of Electrical and Electronics Engineers (IEEE), Washington, D. C. vol. 1.

Bethke, R., M. K. Taylor, S. C. Amstrup, and F. Messler. 1996. Population delineation of polar bears using satellite collar data. Ecological Applications 6(1):311-317.

Durner, G. M., and S. C. Amstrup. 1996. Mass and body-dimension relationships of polar bears in northern Alaska. Wildlife Society Bulletin 24(3):480-484.

Follmann, E. H., G. W. Garner, J. F. Evermann, and A. J. McKeirnan. 1996. Serological evidence of morbillivirus infection in polar bears (Ursus maritimus) from Alaska and Russia. Veterinary Record 138(25):615-618.

Manly, B. F. J., T. L. McDonald, and G. W. Garner. 1996. Maximum likelihood estimation for the double-count method with independent observers. Journal of Agricultural, Biological, and Environmental Statistics 1(2):170-189.

1995

Amstrup, S. C. 1995. Movements, distribution, and population dynamics of polar bears in the Beaufort Sea. Ph. D. Dissertation, University of Alaska, Fairbanks. 299 pp.

Amstrup, S. C. 1995. Polar bear research in the Beaufort Sea.  Pages 145-153 in O. Wiig, E. W. Born, and G. W. Garner, Editors. Proceedings of the 11th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 25-27 Jan 1993, Copenhagen, Denmark. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 10. 192 pp.

Amstrup, S. C. 1995. Polar bear research in the Beaufort Sea.  Page 13 in Proceedings of the Canadian Polar Bear Technical Committee.

Amstrup, S. C., and G. M. Durner. 1995. Survival rates of radio-collared female polar bears and their dependent young. Canadian Journal of Zoology 73(7):1312-1322.

Amstrup, S. C., G. W. Garner, and G. M. Durner.  1995. Polar bears in Alaska. Pp. 351-353 in E. T. LaRoe, G. S. Farris, C. E. Puckett, P. D. Doran, and M. J. Mac, Editors. Our Living Resources: A Report to the Nation on the Distribution, Abundance, and Health of U. S. Plants, Animals, and Ecosystems. U. S. National Biological Service, Washington, D. C. 530 pp.

Durner, G. M., and S. C. Amstrup. 1995. Movements of a polar bear from northern Alaska to northern Greenland. Arctic 48(4):338-341.

Schliebe, S. L., S. C. Amstrup, and G. W. Garner. 1995. Status of polar bears in Alaska 1993.  Pages 125-138 in O. Wiig, E. W. Born, and G. W. Garner, Editors. Proceedings of the 11th Working Meeting of the IUCN/SSC Polar Bear, 25-27 Jan 1993, Copenhagen, Denmark. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 10. 192 pp.

Wiig, O., E. W. Born, and G. W. Garner (Editors). 1995. Proceedings of the 11th Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 25-27 Jan 1993, Copenhagen, Denmark. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 10. 192 pp.

1994

Amstrup, S. C., and G. M. Durner. 1994. Polar bear research in the Beaufort Sea.  Pages 13-17 in Proceedings of the Canadian Polar Bear Technical Committee.

Amstrup, S. C., and C. L. Gardner. 1994. Polar bear maternity denning in the Beaufort Sea. Journal of Wildlife Management 58(1):1-10.

Garner, G. W., S. C. Amstrup, I. Stirling, and S. E. Belikov. 1994. Habitat considerations for polar bears in the North Pacific Rim.  Pages 111-120 in Proceedings of the 59th North American Wildlife and Natural Resources Conference, Anchorage, Alaska.

Garner, G. W., S. E. Belikov, M. S. Stishov, V. G. Barnes, and S. M. Arthur. 1994. Dispersal patterns of maternal polar bears from the denning concentrations on Wrangel Island.  Pages 401-410 in J. J. Claar and P. Shullery, Editors. Proceedings of the Ninth International Conference on Bear Research and Management, Missoula, Montana. International Association for Bear Research and Management,587 pp.

Garner, G. W., L. L. McDonald, and D. S. Robson. 1994. Challenges in the estimation of population size for polar bears in western Alaska.  Pages 180-188 in Proceedings of the 59th North American Wildlife and Natural Resources Conference, Anchorage, Alaska.

1993

Amstrup, S. C. 1993. Human disturbances of denning polar bears in Alaska. Arctic 46(3):246-250.

Amstrup, S. C., G. W. Garner, M. A. Cronin, and J. C. Patton. 1993. Sex identification of polar bears from blood and tissue samples. Canadian Journal of Zoology 71(11):2174-2177.

1992

Bruce, D. S., D. L. Ambler, T. M. Henschel, P. R. Oeltgen, S. P. Nilekani, and S. C. Amstrup. 1992. Suppression of guinea pig ileum induced contractility by plasma albumin of hibernators. Pharmacology Biochemistry and Behavior 43(1):199-203.

Garner, G. W., L. L. McDonald, D. S. Robson, D. P. Young, and S. M. Arthur. 1992. Literature review: Population estimation methodologies applicable to the estimation of abundance of polar bears. U. S. Fish and Wildlife Service, Anchorage, Alaska. Unpublished Report to Marine Mammals Management. 102 pp.

Stishov, M. S., G. W. Garner, S. M. Arthur, and V. G. Barnes Jr. 1992. Distribution and relative abundance of maternal polar bears dens in the Chukotka Peninsula region, U.S.S.R.  Page 67 in Proceedings of the Ninth Biennial Conference on the Biology of Marine Mammals, 5-9 Dec 1991, Chicago, Illinois. Society for Marine Mammalogy.

1991

Amstrup, S. C. 1991. Polar bear. Pages 58-59 in J. Rennicke. Bears of Alaska in Life and Legend. Roberts Rinehart, Boulder, Colorado, 63 pp.

Amstrup, S. C. 1991. White bear: Encounters with the master of the Arctic ice [Book Review]. Arctic 44(3):259-260.

Amstrup, S. C., and C. Gardner. 1991. Research on polar bears in northern Alaska, 1985-1988.  Pages 43-53 in S. C. Amstrup and O. Wiig, Editors. Proceedings of the Tenth Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 25-29 Oct 1988, Sochi, Russia. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 7. 107 pp.

Amstrup, S. C., and O. Wiig (Editors). 1991. Proceedings of the Tenth Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 25-29 Oct 1988, Sochi, Russia. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland. IUCN/SSC Occasional Paper 7. 107 pp.

Cronin, M. A., S. C. Amstrup, and G. W. Garner.  1991. Mitochondrial DNA variation in management of North American bear populations. U. S. Fish and Wildlife Service, Anchorage, Alaska. Research Information Bulletin 61. 3 pp.

Cronin, M. A., S. C. Amstrup, G. W. Garner, and E. R. Vyse. 1991. Interspecific and intraspecific mitochondrial-DNA variation in North American bears (Ursus). Canadian Journal of Zoology 69(12):2985-2992.

1990

Bruce, D. S., N. K. Darling, K. J. Seeland, P. R. Oeltgen, and S. C. Amstrup. 1990. Does the polar bear (Ursus maritimus) hibernate? Continued studies on opioids and hibernation. Federation of American Societies for Experimental Biology Journal 3(988):A396.

Bruce, D. S., N. K. Darling, K. J. Seeland, P. R. Oeltgen, S. P. Nilekani, and S. C. Amstrup. 1990. Is the polar bear (Ursus maritimus) a hibernator - Continued studies on opioids and hibernation. Pharmacology Biochemistry and Behavior 35(3):705-711. [Details] [Full Publication] [PDF file 118kb]

Garner, G. W., S. T. Knick, and D. C. Douglas. 1990. Seasonal movements of adult female polar bears in the Bering and Chukchi Seas.  Pages 219-226 in L. M. Darling and W. R. Archibald, Editors. Proceedings of the Eighth International Conference on Bear Research and Management, 20-25 Feb 1989, Victoria, Canada. International Association for Bear Research and Management,448 pp.

Harris, R. B., S. G. Fancy, D. C. Douglas, G. W. Garner, S. C. Amstrup, T. R. McCabe, and L. F. Pank. 1990. Tracking wildlife by satellite: Current systems and performance. U. S. Fish and Wildife Service, Anchorage, Alaska. Technical Report 30. 52 pp.

1989

Amstrup, S. C., and C. Gardner. 1989. Philopatry in maternal denning of polar bears in the Beaufort Sea.  Page 2 in Proceedings of the Eighth Biennial Conference on the Biology of Marine Mammals.

Amstrup, S. C., C. Gardner, K. C. Myers, and F. W. Oehme. 1989. Ethylene glycol (antifreeze) poisoning in a free-ranging polar bear. Veterinary and Human Toxicology 31(4):317-319.

Amstrup, S. C., and C. A. Nielsen. 1989. Acute gastric dilatation and volvulus in a free-living polar bear. Journal of Wildlife Diseases 25(4):601-604.

Garner, G. W., S. C. Amstrup, D. C. Douglas, and C. L. Gardner. 1989. Performance and utility of satellite telemetry during field studies of free-ranging polar bears in Alaska.  Pages 67-76 in C. J. Amlaner Jr, Editor. Proceedings of the Tenth International Symposium on Biotelemetry.

Schell, D. M., and S. C. Amstrup. 1989. Oceanic gradients in stable isotope ratios and application to marine mammal studies.  Page 60 in Proceedings of the Eighth Biennial Conference on the Biology of Marine Mammals, 7-11 Dec 1989, Pacific Grove, California.

1988

Amstrup, S. C., and D. P. DeMaster. 1988. Polar bear. Pages 39-56 in J. W. Lentfer, Editor. Selected Marine Mammals of Alaska: Species Accounts with Research and Management Recommendations. U. S. Marine Mammal Commission, Washington, D. C.

Fancy, S. G., R. B. Harris, D. C. Douglas, L. F. Pank, K. R. Whitten, T. R. McCabe, S. C. Amstrup, and G. W. Garner. 1988. Applications of satellite telemetry to wildlife research and management in Alaska.  Pages 5-12 in Ate du Colloque International: Suivi des Vertebres Terrestres par Radiotelemetrie, Monaco. 191 pp.

Fancy, S. G., L. F. Pank, D. C. Douglas, C. H. Curby, G. W. Garner, S. C. Amstrup, and W. L. Regeli. 1988. Development and evaluation of a system for tracking wildlife by satellite. In Proceedings of the Second International Symposium on Nutrition of Herbivores, Brisbane, Australia.

Fancy, S. G., L. F. Pank, D. C. Douglas, C. H. Curby, G. W. Garner, S. C. Amstrup, and W. L. Regelin. 1988. Satellite telemetry: A new tool for wildlife research and management. U. S. Fish and Wildlife Service, Anchorage, Alaska. Resource Publication 172. 55 pp.

1987

Amstrup, S. C. 1987. Marine denning of polar bears in Alaska.  Page 2 in Proceedings of the Seventh Biennial Conference on the Biology of Marine Mammals, 5-9 Dec 1987, Miami, Florida. Society for Marine Mammalogy.

Kelly, B. P., S. C. Amstrup, C. Gardner, and L. T. Quakenbush. 1987. Predation on ringed seals in the western Beaufort Sea. Proceedings of the Seventh Biennial Conference on the Biology of Marine Mammals, 5-9 Dec 1987, Miami, Florida. Society for Marine Mammalogy.

1986

Amstrup, S. C. 1986. Polar bear. Pages 790-804 in R. DiSilvestro, Editor. Audubon Wildlife Report 1986. National Audubon Society, New York.

Amstrup, S. C. 1986. Research on polar bears in Alaska, 1983-1985.  Pages 85-115 in Proceedings of the Nineth Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 9-11 Aug 1985, Edmonton, Canada. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland.

Amstrup, S. C., I. Stirling, and J. W. Lentfer. 1986. Past and present status of polar bears in Alaska. Wildlife Society Bulletin 14(3):241-254.

Amstrup, S. C., I. Stirling, and J. W. Lentfer. 1986. Size and trends of Alaskan polar bear populations. Wildlife Society Bulletin 14:251-254.

1984

Amstrup, S. C. 1984. Master of the northern ice. Alaska 50:32-36, 74-77.

1981

Amstrup, S. C. 1981. Polar bear research in Alaska, Spring 1981. U. S. Fish and Wildlife Service, Anchorage, Alaska. Unpublished Report. 42 pp.

Amstrup, S. C. 1981. Research on Alaskan polar bears in 1979 and 1980.  Pages 119-124 in Proceedings of the Eighth Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 15-19 Jan 1981, Oslo, Norway. International Union for Conservation of Nature and Natural Resources, Gland, Switzerland.

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