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  • Southern hemisphere humpback whale lipid-adjusted blubber and skin biopsy data used for bulk stable isotope analysis to evaluate methodology utilized for long-term dietary monitoring

    Author(s)
    Eggebo, June
    Groβ, Jasmin
    Bengtson Nash, Susan
    Griffith University Author(s)
    Eggebo, June
    Bengston Nash, Susan
    Year published
    2022
    Metadata
    Show full item record
    Abstract
    Blubber and skin are commonly used tissues in stable isotope analysis for the purpose of investigating cetacean diet. Critical comparison of tissue-specific isotopic signals is, however, lacking resulting in uncertainty surrounding the representativeness and therefore utility of different tissues for accurate determination of recent foraging. Paired blubber and skin biopsy samples were collected from free-swimming southern hemisphere humpback whales in SE Queensland Australia between 2008 and 2018 as part of long-term monitoring under the Humpback Whale Sentinel Program. A total of 171 paired biopsies were included in this ...
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    Blubber and skin are commonly used tissues in stable isotope analysis for the purpose of investigating cetacean diet. Critical comparison of tissue-specific isotopic signals is, however, lacking resulting in uncertainty surrounding the representativeness and therefore utility of different tissues for accurate determination of recent foraging. Paired blubber and skin biopsy samples were collected from free-swimming southern hemisphere humpback whales in SE Queensland Australia between 2008 and 2018 as part of long-term monitoring under the Humpback Whale Sentinel Program. A total of 171 paired biopsies were included in this study, were the authors recorded migration direction (north or south) and sex (male or female). Both tissues were treated for lipid correction: blubber was applied a solvent lipid extraction; a modified methanol-dichloromethane-water method, whilst skin was applied a mathematical mass-balance model for lipid correction. Significant differences were observed for both δ13C and δ15N between lipid-extracted blubber and lipid-corrected skin tissue, flagging previously undocumented methodological considerations, and the need for method validation and standardisation in application of these approaches. This study therefore advances methodological aspects of cetacean dietary analysis. This is of elevated importance in the context of rapidly changing ocean ecosystems.
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    Publisher URI
    https://www.griffith.edu.au/
    DOI
    https://doi.org/10.25904/1912/4431
    Copyright Statement
    Authors own copyright in the work.
    Item Access Status
    Contact for access rights: s.bengtsonnash@griffith.edu.au
    Note
    Supports - Groß, J., Fry, B., Burford, M.A. and Bengtson Nash, S., 2021. Assessing the effects of lipid extraction and lipid correction on stable isotope values (δ13C and δ15N) of blubber and skin from southern hemisphere humpback whales. Rapid Communications in Mass Spectrometry, 35(16), p.e9140.
    Supports - Bengtson Nash, S.M., Castrillon, J., Eisenmann, P., Fry, B., Shuker, J.D., Cropp, R.A., Dawson, A., Bignert, A., Bohlin‐Nizzetto, P., Waugh, C.A. and Polkinghorne, B.J., 2018. Signals from the south; humpback whales carry messages of Antarctic sea‐ice ecosystem variability. Global Change Biology, 24(4), pp.1500-1510.
    https://www.southernoceansentinel.org/
    Subject
    Ecological Applications
    Blubber
    Foraging ecology
    Lipids
    Sentinel parameter
    Skin
    Trophic biology
    Stable Isotopes
    Carbon
    Nitrogen
    Publication URI
    http://hdl.handle.net/10072/411770
    Data link
    https://bit.ly/GRDCmediation
    Collection
    • Research data

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