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Mark S. Udevitz

Title: Research Statistician (Biology)
Address: 4210 University Dr., Anchorage, AK 99508-4626
Phone: (907) 786-7083
Fax: (907) 786-7150
Email: mudevitz@usgs.gov

orcid.org/0000-0003-4659-138X

Image of Mark S. Udevitz

Education and/or Training

Ph.D.1990North Carolina State UniversityBiomathematics and Statistics
M.S.1982West Virginia UniversityWildlife Management
B.S.1979Colorado State UniversityWildlife Biology

Areas of Specialization and/or Research Interests

Methods for sampling, estimating parameters, and modeling dynamics of wildlife populations.

Websites of Interest

Biometrics Research at the Alaska Science Center

Publications

Total pubs: 47

Taylor, R. L., M. S. Udevitz, C. V. Jay, J. J. Citta, L. T. Quakenbush, P. R. Lemons, and J. A. Snyder. 2017. Demography of the Pacific walrus (Odobenus rosmarus divergens) in a changing Arctic. Marine Mammal Science Early View. doi:10.1111/mms.12434 [Details] [Full Publication]

Jay, C. V., R. L. Taylor, A. S. Fischbach, M. S. Udevitz, and W. S. Beatty. 2017. Walrus haul-out and in water activity levels relative to sea ice availability in the Chukchi Sea. Journal of Mammalogy 98:386-396. doi:10.1093/jmammal/gyw195 [Details] [Full Publication]

Battaile, B. C., C. V. Jay, M. S. Udevitz, and A. S. Fischbach. 2017. Evaluation of a method using survey counts and tag data to estimate the number of Pacific walruses (Odobenus rosmarus divergens) using a coastal haulout in northwestern Alaska. Polar Biology 40(7):1359-1369. doi:10.1007/s00300-016-2060-5 [Details] [Full Publication]

Udevitz, M. S., C. V. Jay, R. L. Taylor, A. S. Fischbach, W. S. Beatty, and S. R. Noren. 2017. Forecasting consequences of changing sea ice availability for Pacific walruses. Ecosphere 8(11):e02014. doi:10.1002/ecs2.2014 [Details] [Full Publication]

Noren, S. R., M. S. Udevitz, and C. V. Jay. 2016. Sex-specific energetics of Pacific walruses (Odobenus rosmarus divergens) during the nursing interval. Physiological and Biochemical Zoology 89(2). doi:10.1086/685454 [Details] [Full Publication]

Taylor, R. L. and M. S. Udevitz. 2015. Demography of the Pacific walrus (Odobenus rosmarus divergens): 1974-2006. Marine Mammal Science 31(1):231-254. doi:10.1111/mms.12156 [Details] [Full Publication]

Noren, S. R., M. S. Udevitz, L. Triggs, J. Paschke, L. Oland, and C. V. Jay. 2015. Identifying a reliable blubber measurement site to assess body condition in a marine mammal with topographically variable blubber, the Pacific walrus. Marine Mammal Science 31(2):658-676. doi:10.1111/mms.12186 [Details] [Full Publication]

Van Hemert, C. R., P. L. Flint, M. S. Udevitz, J. C. Koch, T. C. Atwood, K. L. Oakley, and J. M. Pearce. 2015. Forecasting wildlife response to rapid warming in the Alaskan Arctic. BioScience 65(7):718-728. doi:10.1093/biosci/biv069 [Details] [Full Publication]

Noren, S. R., M. S. Udevitz, and C. V. Jay. 2014. Energy demands for maintenance, growth, pregnancy, and lactation of female Pacific walruses (Odobenus rosmarus divergens). Physiological and Biochemical Zoology 87(6). doi:10.1086/678237 [Details] [Full Publication]

Udevitz, M. S. and W. R. Gould. 2013. Abundance: population size and density estimation. Pages 4-11 in A. H. El-Shaarawi and W. W. Piegorsch, (eds.). Encyclopedia of Environmetrics, Volume 2. John Wiley & Sons, New York City, NY, USA. doi:10.1002/9780470057339.vaa002.pub2 [Details] [Full Publication]

Udevitz, M. S., R. L. Taylor, J. L. Garlich-Miller, L. T. Quakenbush, and J. A. Snyder. 2013. Potential population-level effects of increased haulout-related mortality of Pacific walrus calves. Polar Biology 36(2):291-298. doi:10.1007/s00300-012-1259-3 [Details] [Full Publication]

Udevitz, M. S. 2013. Change-in-ratio. Pages 372-374 in A. H. El-Shaarawi and W. W. Piegorsch, (eds.). Encyclopedia of Environmetrics, Volume 2. John Wiley & Sons, New York City, NY, USA. doi:10.1002/9780470057339.vac015m.pub2 [Details] [Full Publication]

Monson, D. H., M. S. Udevitz, and C. V. Jay. 2013. Estimating age ratios and size of Pacific walrus herds on coastal haulouts using video imaging. PLoS One 8(7):e69806. doi:10.1371/journal.pone.0069806 [Details] [Full Publication]

Noren, S. R., M. S. Udevitz, and C. V. Jay. 2012. Bioenergetics model for estimating food requirements of female Pacific walruses (Odobenus rosmarus divergens). Marine Ecology Progress Series 460:261-275. doi:10.3354/meps09706 [Details] [Full Publication]

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]

Udevitz, M. S. and P. J. P. Gogan. 2012. Estimating survival rates with time series of standing age-structure data. Ecology 93(4):726-732. doi:10.1890/11-1766.1 [Details] [Full Publication]

Speckman, S. G., V. I. Chernook, D. M. Burn, M. S. Udevitz, A. A. Kochnev, A. Vasilev, C. V. Jay, A. Lisovsky, A. S. Fischbach, and R. B. Benter. 2011. Results and evaluation of a survey to estimate Pacific walrus population size, 2006. Marine Mammal Science 27(3):514-553. doi:10.1111/j.1748-7692.2010.00419.x [Details] [Full Publication]

Jay, C. V., M. S. Udevitz, R. Kwok, A. S. Fischbach, and D. C. Douglas. 2010. Divergent movements of walrus and sea ice in the northern Bering Sea. Marine Ecology Progress Series 407:293-302. doi:10.3354/meps08575 [Details] [Full Publication]

Burn, D. M., M. S. Udevitz, S. G. Speckman, and R. B. Benter. 2009. An improved procedure for detection and enumeration of walrus signatures in airborne thermal imagery. International Journal of Applied Earth Observation and Geoinformation 11(5):324-333. doi:10.1016/j.jag.2009.05.004 [Details] [Full Publication]

Udevitz, M. S., C. V. Jay, A. S. Fischbach, and J. L. Garlich-Miller. 2009. Modeling haul-out behavior of walruses in Bering Sea ice. Canadian Journal of Zoology 87(12):1111-1128. doi:10.1139/Z09-098 [Details] [Full Publication]

Udevitz, M. S., D. M. Burn, and M. A. Webber. 2008. Estimation of walrus populations on sea ice with infrared imagery and aerial photography. Marine Mammal Science 24(1):57-70. doi:10.1111/j.1748-7692.2007.00169.x [Details] [Full Publication]

Udevitz, M. S., C. V. Jay, A. S. Fischbach, and J. L. Garlich-Miller. 2007. Adjusting for telemetry bias in behavior data. Annual Meeting of the Alaska Chapter of the American Statistical Association, 24-26 July. Anchorage, AK, USA. [Details]

Udevitz, M. S., B. S. Shults, L. G. Adams, and C. W. Kleckner. 2006. Evaluation of aerial suvery methods for Dall's Sheep. Wildlife Society Bulletin 34(3):732-740. doi:10.2193/0091-7648(2006)34[732:EOASMF]2.0.CO;2 [Details] [Full Publication]

Burn, D. M., M. A. Webber, and M. S. Udevitz. 2006. Application of airborne thermal imagery to surveys of Pacific walrus. Wildlife Society Bulletin 34(1):51-58. doi:10.2193/0091-7648(2006)34[51:AOATIT]2.0.CO;2 [Details] [Full Publication]

Quakenbush, L., J. L. Garlich-Miller, J. A. Snyder, C. Hamilton, E. Labunski, M. S. Udevitz, and M. Apatiki. 2006. Cruise Report: Walrus tagging aboard the P/V Stimson, Bering Sea, March 2006. Technical Report submitted to U.S. Fish and Wildlife Service, Marine Mammals Management (MMM), Anchorage, Alaska. [Details]

Densmore, R. V., C. R. Ely, K. S. Bollinger, S. Kratzer, M. S. Udevitz, D. J. Fehringer, and T. C. Rothe. 2006. Nesting habitat of the tule greater white-fronted goose Anser albifrons elgasi. Wildfowl 56:37-51. [Details] [Full Publication]

Udevitz, M. S., C. V. Jay, and M. B. Cody. 2005. Observer variability in pinniped counts: ground-based enumeration of walruses at haul-out sites. Marine Mammal Science 21(1):108-120. doi:10.1111/j.1748-7692.2005.tb01211.x [Details] [Full Publication]

Burn, D. M., M. S. Udevitz, M. A. Webber, and J. L. Garlich-Miller. 2005. Development of airborne remote sensing methods for surveys of Pacific walrus. MMS OCS Study. [Details]

Udevitz, M. S. 2004. Statistical procedures for estimating Pacific walrus population size. USGS Technical Report, 9 p. [Details]

Kleckner, C. W., M. S. Udevitz, L. G. Adams, and B. S. Shults. 2003. Demography of Dall's sheep in northwestern Alaska. Arctic Research of the United States 16:68-73. [Details] [Full Publication]

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, (eds.). Arctic refuge coastal plain terrestrial wildlife research summaries. USGS Biological Science Report USGS/BRD/BSR-2002-0001 [Details]

Jorgenson, J. J., M. S. Udevitz, and N. A. Felix. 2002. Forage quantity and quality. Pages 46-50 in D. C. Douglas, P. E. Reynolds, and E. B. Rhode, (eds.). Arctic refuge coastal plain terrestrial wildlife research summaries. USGS Biological Science Report USGS/BRD/BSR-2002-0001 [Details]

Udevitz, M. S. 2002. Abundance: population size and density estimation. Pages 4-11 in A. H. El-Shaarawi and W. W. Piegorsch, (eds.). Encyclopedia of Environmetrics, Volume 1. John Wiley & Sons, New York City, NY, USA. [Details]

Udevitz, M. S. 2002. Change-in-ratio. Pages 322-324 in A. H. El-Shaarawi and W. W. Piegorsch, (eds.). Encyclopedia of Environmetrics, Volume 1. John Wiley & Sons, New York City, NY, USA. [Details]

Udevitz, M. S., J. R. Gilbert, and G. A. Fedoseev. 2001. Comparison of methods used to estimate numbers of walruses on sea ice. Marine Mammal Science 17(3):601-616. doi:10.1111/j.1748-7692.2001.tb01007.x [Details] [Full Publication]

Bodkin, J. L. and M. S. Udevitz. 1999. An aerial survey method to estimate sea otter abundance. Pages 13-26 in G. W. Garner, S. C. Amstrup, J. L. Laake, B. F. J. Manly, L. L. McDonald and D. G. Robertson, (eds.). Marine mammal survey and assessment methods. A. A. Balkema, Leiden, Netherlands. [Details]

Udevitz, M. S. 1999. Modeling variability in replicated surveys at aggregation sites. Pages 167- 177 in G. W. Garner, S. C. Amstrup, J. L. Laake, B. F. J. Manly, L. L. McDonald and D. G. Robertson, (eds.). Marine mammal survey and assessment methods. A. A. Balkema, Leiden, Netherlands. [Details] [Full Publication]

Udevitz, M. S. and B. E. Ballachey. 1998. Estimating survival rates with age-structure data. Journal of Wildlife Management 62(2):779-792. [Details] [Full Publication]

Gilbert, J. R. and M. S. Udevitz. 1997. Adaptation of a stage-projection model for species with multiple year reproductive cycles. Ecological Modeling 97(1-2):47-57. doi:10.1016/S0304-3800(96)00073-7 [Details] [Full Publication]

Barnes, V. G., Jr., R. B. Smith, M. S. Udevitz, and J. R. Bellinger. 1995. Kodiak brown bears. Pages 349-350 in E. T. LaRoe III, G. S. Farris, C. E. Puckett and P. D. Doran, (eds.). Our Living Resources 1994: A report to the nation on the distribution, abundance and health of U.S. plants, animals and ecosystems. US Deptartment of Interior, National Biological Service, 530 p. [Details]

Udevitz, M. S. and K. H. Pollock. 1995. Using effort information with change-in-ratio data for population estimation. Biometrics 51(2):471-481. [Details]

Udevitz, M. S., J. L. Bodkin, and D. P. Costa. 1995. Detection of sea otters in boat-based surveys of Prince William Sound, Alaska. Marine Mammal Science 11:59-71. doi:10.1111/j.1748-7692.1995.tb00274.x [Details] [Full Publication]

Bodkin, J. L. and M. S. Udevitz. 1994. An intersection model for estimating sea otter mortality along the Kenai Peninsula. Pages 81-95 in T. R. Loughlin, (ed.). Marine mammals and the Exxon Valdez. Academic Press, Orlando, FL, USA. [Details] [Full Publication]

Bodkin, J. L. and M. S. Udevitz. 1993. An intersection model for estimating sea otter mortality following the Exxon Valdez oil spill. Pages 289-291 in B. Spies, L. J. Evans, B. Wright, M. Leonard, and C. Holba, (eds.). Proceedings: Exxon Valdez Oil Spill Symposium [Details]

Udevitz, M. S. and K. H. Pollock. 1992. Change-in-ratio methods for estimating population size. Pages 90-101 in D. R. McCullough and R. H. Barrett, (eds.). Wildlife 2001: Populations. Elsevier Science Publishers, London, England. doi:10.1007/978-94-011-2868-1_9 [Details] [Full Publication]

Douglas, D. C., M. S. Udevitz, J. R. Gilbert, and D. O. Hunter. 1991. Evaluation of airborne videography for enumerating Pacific walruses (Odobenus rosmarus divergens) on sea-ice haulouts. Pages 507-513 in Proceedings: International Symposium on Advanced Technology in Natural Resource Management American Society Photogrammetery and Remote Sensing Falls Church, VA, USA. [Details] [Full Publication]

Udevitz, M. S. and K. H. Pollock. 1991. Change-in-ratio estimators for populations with more than 2 subclasses. Biometrics 47(4):1531-1546. [Details] [Full Publication]

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