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• W2162289757 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 416:285-294 (2010) - DOI: https://doi.org/10.3354/meps08756 Niche partitioning among and within sympatric tropical seabirds revealed by stable isotope analysis Hillary S. Young1,*, Douglas J. McCauley1, Rodolfo Dirzo1, Robert B. Dunbar2, Scott A. Shaffer3 1Department of Biology and 2Environmental Earth System Science, Stanford University, Stanford, California 94305, USA 3Department of Biological Sciences, San José State University, San José, California 95192, USA *Email: hsyoung@stanford.edu ABSTRACT: The low productivity and unpredictable nature of resources in tropical waters would appear to make resource partitioning among predators difficult. Yet, stable isotope data from the present study suggest that substantial resource partitioning occurs among tropical seabird communities, both between and within species. In the present study, we compared δ13C and δ15N levels among 8 sympatric tropical seabird species. For a subset of these species, we also examined isotopic levels across years, breeding periods, and sexes. When breeding and non-breeding periods were both considered, we found that all species occupied distinct isotopic niches across at least one time period. Resource partitioning by age (within the same year) and year studied (for birds of the same age), within species was observed in all the species we examined. However, niche separation by sex appeared to be relatively uncommon even in sexually dimorphic species. As a group, seabirds were isotopically distinct from other marine predators. There was a strong correlation between both body mass and wing loading ratios and foraging area, as evaluated using δ13C levels. Cumulatively, the isotopic patterns observed are consistent with diet-based surveys of resource partitioning during the breeding period. Importantly, these data provide additional evidence to suggest that substantial niche partitioning among tropical seabird species persists even during non-breeding periods in open ocean environments, when direct diet-based surveys are difficult to conduct. KEY WORDS: Resource partitioning · Foraging ecology · δ13C · δ15N · Marine predators Full text in pdf format PreviousNextCite this article as: Young HS, McCauley DJ, Dirzo R, Dunbar RB, Shaffer SA (2010) Niche partitioning among and within sympatric tropical seabirds revealed by stable isotope analysis. Mar Ecol Prog Ser 416:285-294. https://doi.org/10.3354/meps08756 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 416. Online publication date: October 14, 2010 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2010 Inter-Research." @default.
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• W2162289757 title "Niche partitioning among and within sympatric tropical seabirds revealed by stable isotope analysis" @default.
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• W2162289757 doi "https://doi.org/10.3354/meps08756" @default.
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