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Constancy and change in marine predator diets across a shift in oceanographic conditions in the Northern California Current |
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| Authors: | Amanda J. Gladics Robert M. Suryan Richard D. Brodeur Leah M. Segui Laura Z. Filliger |
| Affiliation: | 1. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, 97331, USA 2. Oregon State University, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, OR, 97365, USA 3. Northwest Fisheries Science Center, National Oceanic and Atmospheric Administration, Newport, OR, 97365, USA 4. Department of Biology, San Diego State University, San Diego, CA, 92182, USA 5. Department of Zoology, Oregon State University, Corvallis, OR, 97331, USA 6. Carnegie Mellon University, Pittsburgh, PA, 15213, USA 7. Department of Biological Sciences, University of Rhode Island, Kingston, RI, 02881, USA |
| Abstract: | 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 Niño (2010) and La Niña (2011) conditions. We found greater niche specialization during El Niño and increased niche overlap during La Niña 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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