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Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages

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https://ir.library.oregonstate.edu/concern/articles/z316q212x

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Abstract
  • As central-place foragers, seabirds from colonies located close to multiple and/or productive marine habitats might experience increased foraging opportunities and enhanced resilience to food shortages. We tested whether this hypothesis might explain divergent trends in 3 populations of black-legged kittiwakes Rissa tridactyla, a surface-feeding piscivore, in the eastern Bering Sea. We simultaneously studied the foraging behavior, diet, nutritional stress, and breeding performance of chick-rearing kittiwakes from 2 continental shelf colonies (St. Paul and St. George) and an oceanic colony (Bogoslof). Although shelf-based forage fishes were rare or absent in bird diets during the cold study year, not all kittiwakes from the 3 colonies concentrated foraging along the productive shelf break habitats. Compared to the oceanic colony, birds from both shelf-located colonies had lower chick provisioning rates, higher levels of nutritional stress, and lower breeding performance. Although birds from both shelf-based colonies foraged in nearby neritic habitats during daytime, birds from St. George, a stable population located closest to the continental shelf break, also conducted long overnight trips to the ocean basin to feed on lipid-rich myctophids. In contrast, birds from St. Paul, a declining population located farthest from shelf break/oceanic habitats, fed exclusively over the shelf and obtained less high-energy food. Birds from Bogoslof, an increasing population, foraged mainly on myctophids close to the colony in the oceanic basin and Aleutian coast habitats. Our study suggests that proximity to multiple foraging habitats may explain divergent population trends among colonies of kittiwakes in the southeastern Bering Sea.
  • Keywords: Seabird populations, Marine habitats, Bering Sea, Productivity, Diet, Kittiwakes, GPS tracking, Foraging strategies, Nutritional stress
  • Keywords: Seabird populations, Marine habitats, Bering Sea, Productivity, Diet, Kittiwakes, GPS tracking, Foraging strategies, Nutritional stress
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  • Peredes, R., Harding, A. M. A., Irons, D. B., Roby, D. D., Suryan, R. M., Orben, R. A., & Renner, H. (2012, December 19). Proximity to multiple foraging habitats enhances seabirds' reilience to local food shortages. Marine Ecology progress Series, 471, 253-269. doi:10.3354/meps10034
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  • 471
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  • This study was funded by NPRB BSIERP Projects B63 and B77 to David Irons and Dan Roby, Project B65 to Heather Renner, and Project B77 to Alexander Kitaysky.
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