期刊
MARINE BIOLOGY
卷 161, 期 4, 页码 837-851出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00227-013-2384-4
关键词
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资金
- Bureau of Land Management
- US Fish and Wildlife Service
- Mamie Markham Graduate Research Fellowship
- Oregon Sea Grant's Robert E. Malouf Marine Science Fellowship
- National Science Foundation's Research Experience for Undergraduates program
- Oregon State University's Office of Sponsored Programs
- William Q. Wick Marine Fisheries award
- Lillian B. Reynolds award
- Oregon Laurels scholarship
- Lottery graduate scholarship
- Northwest Scientific Association
- Directorate For Geosciences
- Division Of Ocean Sciences [1263349] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Ocean Sciences [1004947] Funding Source: National Science Foundation
Variable ocean conditions can greatly impact prey assemblages and predator foraging in marine ecosystems. Our goal was to better understand how a change in ocean conditions influenced dietary niche overlap among a suite of midtrophic-level predators. We examined the diets of three fishes and one seabird off central Oregon during two boreal summer upwelling periods with contrasting El Nio (2010) and La Nia (2011) conditions. We found greater niche specialization during El Nio and increased niche overlap during La Nia in both the nekton and micronekton diet components, especially in the larger, more offshore predators. However, only the two smaller, more nearshore predators exhibited interannual variation in diet composition. Concurrent trawl surveys confirmed that changes in components of predator diets reflected changes in the prey community. Using multiple predators across diverse taxa and life histories provided a comprehensive understanding of food-web dynamics during changing ocean conditions.
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