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    Stable isotope analysis of baleen reveals resource partitioning among sympatric rorquals and population structure in fin whales

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    Author
    Ryan, C.
    McHugh, B.
    Trueman, C.N.
    Sabin, R.
    Deaville, R.
    Harrod, C.
    Berrow, S.D.
    O'Connor, I.
    Keyword
    Diet
    Isotopic niche
    Foraging
    Stock discrimination
    Northeast Atlantic
    Bayesian analysis
    Date
    2013
    Publisher
    Inter-Research
    
    Metadata
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    Abstract
    Stable isotope analysis is a useful tool for investigating diet, migrations and niche in ecological communities by tracing energy through food-webs. In this study, the stable isotopic composition of carbon and nitrogen in keratin was measured at growth increments of baleen plates from 3 sympatric species of rorquals (Balaenoptera acutrostrata, B. physalus and Megaptera novaeangliae), which died between 1985 and 2010 in Irish and contiguous waters. Bivariate ellipses were used to plot isotopic niches and standard ellipse area parameters were estimated via Bayesian inference using the SIBER routine in the SIAR package in R. Evidence of resource partitioning was thus found among fin, humpback and minke whales using isotopic niches. Highest δ15N values were found in minke whales followed by humpback, and fin whales. Comparison between Northeast Atlantic (Irish/UK and Biscayan) and Mediterranean fin whale isotopic niches support the current International Whaling Commission stock assessment of an isolated Mediterranean population. Significantly larger niche area and higher overall δ 15N and δ 13C values found in fin whales from Irish/UK waters compared to those sampled in adjacent regions (Bay of Biscay and Mediterranean) suggest inshore foraging that may be unique to fin whales in Ireland and the UK. Isotopic profiles support spatial overlap but different foraging strategies between fin whales sampled in Ireland/UK and the Bay of Biscay. Stable isotope analysis of baleen could provide an additional means for identifying ecological units, thus supporting more effective management for the conservation of baleen whales.
    URI
    http://hdl.handle.net/10793/1282
    Description
    Peer-reviewed.
    Citation
    Ryan, C., McHugh, B., Trueman, C.N., Sabin, R., Deaville, R., Harrod, C., Berrow, S.D. and O'Connor, I. (2013). Stable isotope analysis of baleen reveals resource partitioning among sympatric rorquals and population structure in fin whales. Marine ecology progress series, 479, pp. 251-261 DOI: https://doi.org/10.3354/meps10231
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