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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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https://ir.library.oregonstate.edu/concern/articles/kd17cv529

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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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  • Gladics, A. J., Suryan, R. M., Brodeur, R. D., Segui, L. M., & Filliger, L. Z. (2014). Constancy and change in marine predator diets across a shift in oceanographic conditions in the Northern California Current. Marine Biology, 161(4), 837-851. doi:10.1007/s00227-013-2384-4
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Journal Volume
  • 161
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  • 4
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  • We thank NOAA's StockAssessment Improvement Program for funding the midwater trawlsampling and Toby Auth and Tristan Britt for collecting and analyzingthe samples. Research was funded in part by theBureau of Land Management, the US Fish and Wildlife Service, aMamie Markham Graduate Research Fellowship, Oregon Sea Grant'sRobert E. Malouf Marine Science Fellowship, National Science Foundation’sResearch Experience for Undergraduates program, OregonState University’s Office of Sponsored Programs, William Q. WickMarine Fisheries award, Lillian B. Reynolds award, Oregon Laurelsand Lottery graduate scholarships, and a student research grant fromthe Northwest Scientific Association.
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file details GladicsAmandaCEOASConstancyChangeMarine_SupplementalMaterials.zip 07/26/2017 公开
file details GladicsAmandaCEOASConstancyChangeMarine.pdf 07/26/2017 公开