Articles | Volume 13, issue 8
Research article
29 Apr 2016
Research article |  | 29 Apr 2016

Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea

Nobuo Kokubun, Takashi Yamamoto, Nobuhiko Sato, Yutaka Watanuki, Alexis Will, Alexander S. Kitaysky, and Akinori Takahashi

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Cited articles

Barger, C. P. and Kitaysky, A. S.: Isotopic segregation between sympatric seabird species increases with nutritional stress, Biol. Lett., 8, 442–445, 2012.
Barger, C. P., Young, R. C., Cable, J. M., Ito, M., and Kitaysky, A. S.: Resource partitioning between sympatric seabird species increases during chick-rearing, Ecosphere, in press, 2016.
Barrett, R. T., Asheim, M., and Bakken, V.: Ecological relationships between two sympatric congeneric species, common murres and thick-billed murres, Uria aalge and U. lomvia, breeding in the Barents Sea, Can. J. Zoolog., 75, 618–631, 1997.
Barrett, R. T., Erikstad, K. E., Sandvik, H., Myksvoll, M., Jenni-Eierlmann, S., Kristensen, D. L., Moum, T., Reiertsen, T. K., and Vikebø, F.: The stress hormone corticosterone in a marine top predator reflects short-term changes in food availability, Ecol. Evol., 5, 1306–1317, 2015.
Benowitz-Fredericks, Z. M., Shultz, M. T., and Kitaysky, A. S.: Stress hormones suggest opposite trends of food availability for planktivorous and piscivorous seabirds in 2 years, Deep-Sea Res. Pt. II, 55, 1868–1876, 2008.
Short summary
Subarctic climate changes may affect the foraging ecology of top predators. We studied the foraging characteristics of two diving seabirds: common (COMUs) and thick-billed murres (TBMUs). COMUs had smaller wing area, partly used deeper depths with more frequent wing strokes, and used higher trophic prey than TBMUs. The smaller wing of COMUs may facilitate swimming agility so that they can capture more mobile prey. These may lead to their different responses to local marine environmental changes.
Final-revised paper