5 Works

Data from: Changes in behavior are unable to disrupt a trophic cascade involving a specialist herbivore and its food plant

Madeleine G. Lohman, Thomas V. Riecke, Cheyenne R. Acevedo, Brian T. Person, Joel A. Schmutz, Brian D. Uher-Koch & James S. Sedinger
Changes in ecological conditions can induce changes in behavior and demography of wild organisms, which in turn may influence population dynamics. Black brant (Branta bernicla nigricans) nesting in colonies on the Yukon–Kuskokwim Delta (YKD) in western Alaska have declined substantially (~50%) since the turn of the century. Black brant are herbivores that rely heavily on Carex subspathacea (Hoppner's sedge) during growth and development. The availability of C. subspathacea affects gosling growth rates, which subsequently affect...

Data from: How do baleen whales stow their filter? A comparative biomechanical analysis of baleen bending

Alexander J. Werth, Diego Rita, Michael V. Rosario, Michael J. Moore & Todd L. Sformo
Bowhead and right whale (balaenid) baleen filtering plates, longer in vertical dimension (3-4+ m) than the closed mouth, presumably bend during gape closure. This has not been observed in live whales, even with scrutiny of videorecorded feeding sequences. To determine what happens to baleen as gape closes, we conducted an integrative, multifactorial study including materials testing, functional (flow tank and kinematic) testing, and histological examination. We measured baleen bending properties along the dorsoventral length of...

Stable isotope differences of polar bears in the Southern Beaufort Sea and Chukchi Sea

Malia Smith, Lara Horstmann & Raphaela Stimmelmayr
The life history, genetic, and habitat use differences between the 2 polar bear (Ursus maritimus) subpopulations in Alaska have been used to determine the geographic border separating them, but it has sparked a debate of the correct placement of the border for several years. Recently, the Southern Beaufort Sea (SBS) polar bear subpopulation has declined due to sea ice loss, while the Chukchi Sea (CS) subpopulation appears stable. To provide additional information about potential differences...

Data from: Ringed seal (Pusa hispida) seasonal movements, diving, and haul-out behavior in the Beaufort, Chukchi, and Bering seas (2011–2017)

Andrew Von Duyke, David Douglas, Jason Herreman & Justin Crawford
Continued Arctic warming and sea-ice loss will have important implications for the conservation of ringed seals, a highly ice-dependent species. A better understanding of their spatial ecology will help characterize emerging ecological trends and inform management decisions. We deployed satellite transmitters on ringed seals in the summers of 2011, 2014, and 2016 near Utqiaġvik (formerly Barrow), Alaska to monitor their movements, diving, and haul-out behavior. We present analyses of tracking and dive data provided by...

Data from: Migratory culture, population structure and stock identity in North Pacific beluga whales (Delphinapterus leucas)

Greg O'Corry-Crowe, Robert Suydam, Lori Quakenbush, Brooke Potgieter, Lois Harwood, Dennis Litovka, Tatiana Ferrer, John Citta, Vladimir Burkanov, Kathy Frost, Barbara Mahoney & Greg O’Corry-Crowe
The annual return of beluga whales, Delphinapterus leucas, to traditional seasonal locations across the Arctic may involve migratory culture, while the convergence of discrete summering aggregations on common wintering grounds may facilitate outbreeding. Natal philopatry and cultural inheritance, however, has been difficult to assess as earlier studies were of too short a duration, while genetic analyses of breeding patterns, especially across the beluga's Pacific range, have been hampered by inadequate sampling and sparse information on...

Registration Year

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Affiliations

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  • United States Geological Survey
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