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Constancy and change in marine predator diets across a shift in oceanographic conditions in the Northern California Current Public Deposited

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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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  • 161
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  • 4
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  • We thank NOAA's Stock Assessment Improvement Program for funding the midwater trawl sampling and Toby Auth and Tristan Britt for collecting and analyzing the samples. Research was funded in part by the Bureau of Land Management, the US Fish and Wildlife Service, a 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 and Lottery graduate scholarships, and a student research grant from the Northwest Scientific Association.
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-05-19T19:13:01Z No. of bitstreams: 2 GladicsAmandaCEOASConstancyChangeMarine.pdf: 674197 bytes, checksum: 8e24ea193bfc21996283ba6c95a05b9a (MD5) GladicsAmandaCEOASConstancyChangeMarine_SupplementalMaterials.zip: 1328157 bytes, checksum: 92bb5745e40b0c25b60c5f7a16db8b7f (MD5)
  • description.provenance : Made available in DSpace on 2014-05-19T19:13:12Z (GMT). No. of bitstreams: 2 GladicsAmandaCEOASConstancyChangeMarine.pdf: 674197 bytes, checksum: 8e24ea193bfc21996283ba6c95a05b9a (MD5) GladicsAmandaCEOASConstancyChangeMarine_SupplementalMaterials.zip: 1328157 bytes, checksum: 92bb5745e40b0c25b60c5f7a16db8b7f (MD5) Previous issue date: 2014-04
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-05-19T19:13:12Z (GMT) No. of bitstreams: 2 GladicsAmandaCEOASConstancyChangeMarine.pdf: 674197 bytes, checksum: 8e24ea193bfc21996283ba6c95a05b9a (MD5) GladicsAmandaCEOASConstancyChangeMarine_SupplementalMaterials.zip: 1328157 bytes, checksum: 92bb5745e40b0c25b60c5f7a16db8b7f (MD5)

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