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Marine Ecology Progress Series

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MEPS 471:253-269 (2012)  -  DOI:

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

Rosana Paredes1,*, Ann M. A. Harding2, David B. Irons3, Daniel D. Roby1, Robert M. Suryan4, Rachael A. Orben5, Heather Renner6, Rebecca Young7, Alexander Kitaysky7

1Department of Fisheries and Wildlife, 104 Nash Hall, Oregon State University, Corvallis, Oregon 97331-3803, USA
2Alaska Pacific University, Environmental Science Department, 4101 University Drive, Anchorage, Alaska 99508, USA
3U.S. Fish and Wildlife Service, Anchorage, Alaska 99503, USA
4Oregon State University, Hatfield Marine Science Center, Newport, Oregon 97365, USA
5Ocean Sciences Department, University of California Santa Cruz, Long Marine Lab, Santa Cruz, California 95060, USA
6Alaska Maritime National Wildlife Refuge, U.S. Fish and Wildlife Service, Homer, Alaska 99603, USA
7Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska 99775-7000, USA

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.

KEY WORDS: GPS tracking · Foraging strategies · Marine habitats · Kittiwakes · Productivity · Diet · Nutritional stress · Bering Sea · Seabird populations

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Cite this article as: Paredes R, Harding AMA, Irons DB, Roby DD and others (2012) Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages. Mar Ecol Prog Ser 471:253-269.

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