Polar Biology

, 34:1751 | Cite as

Using body mass dynamics to examine long-term habitat shifts of arctic-molting geese: evidence for ecological change

  • Tyler L. LewisEmail author
  • Paul L. Flint
  • Dirk V. Derksen
  • Joel A. Schmutz
  • Eric J. Taylor
  • Karen S. Bollinger
Original Paper


From 1976 onward, molting brant geese (Branta bernicla) within the Teshekpuk Lake Special Area, Alaska, shifted from inland, freshwater lakes toward coastal wetlands. Two hypotheses explained this redistribution: (1) ecological change: redistribution of molting brant reflects improvements in coastal foraging habitats, which have undergone a succession toward salt-tolerant plants due to increased coastal erosion and saltwater intrusion as induced by climate change or (2) interspecific competition: greater white-fronted geese (Anser albifrons) populations increased 12-fold at inland lakes, limiting food availability and forcing brant into coastal habitats. Both hypotheses presume that brant redistributions were driven by food availability; thus, body mass dynamics may provide insight into the relevance of these hypotheses. We compared body mass dynamics of molting brant across decades (1978, 1987–1992, 2005–2007) and, during 2005–2007, across habitats (coastal vs. inland). Brant lost body mass during molt in all three decades. At inland habitats, rates of mass loss progressively decreased by decade despite the increased number of greater white-fronted geese. These results do not support an interspecific competition hypothesis, instead suggesting that ecological change enhanced foraging habitats for brant. During 2005–2007, rates of mass loss did not vary by habitat. Thus, while habitats have improved from earlier decades, our results cannot distinguish between ecological changes at inland versus coastal habitats. However, we speculate that coastal forage quality has improved beyond that of inland habitats and that the body mass benefits of these higher quality foods are offset by the disproportionate number of brant now molting coastally.


Body mass dynamics Brant geese Habitat change Interspecific competition Molt Teshekpuk Lake 



The Bureau of Land Management and US Geological Survey, Alaska Science Center, provided funding and logistic support. U.S. Fish and Wildlife Service, Region 7, Division of Migratory Bird Management, provided aerial support and assisted with brant captures. J.S. Sedinger, S.J. Portugal, and an anonymous reviewer thoroughly examined and improved the manuscript. Use of trade, product, or company names is solely for descriptive purposes and does not imply endorsement or criticism by the U.S. government. All procedures were approved by Alaska Science Center’s Animal Care and Use Committee, U.S. Geological Survey, under protocol 06-SUP-02, and were authorized by U.S. Fish and Wildlife Service and Bureau of Land Management under permit number BLM AK FF094979.


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Copyright information

© US Government 2011

Authors and Affiliations

  • Tyler L. Lewis
    • 1
    • 2
    Email author
  • Paul L. Flint
    • 1
  • Dirk V. Derksen
    • 1
  • Joel A. Schmutz
    • 1
  • Eric J. Taylor
    • 3
  • Karen S. Bollinger
    • 4
  1. 1.U.S. Geological SurveyAlaska Science CenterAnchorageUSA
  2. 2.Department of Biology and WildlifeInstitute of Arctic Biology, University of Alaska FairbanksFairbanksUSA
  3. 3.U.S. Fish and Wildlife ServiceMigratory Bird ManagementAnchorageUSA
  4. 4.U.S. Fish and Wildlife ServiceMigratory Bird ManagementFairbanksUSA

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