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  • Compound-specific isotope analysis of amino acids reveals dependency on grazing rather than detritivory in mangrove food webs

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    Embargoed until: 2027-01-06
    File version
    Version of Record (VoR)
    Author(s)
    Harada, Yota
    Lee, Shing Yip
    Connolly, Rod M
    Fry, Brian
    Griffith University Author(s)
    Connolly, Rod M.
    Fry, Brian D.
    Year published
    2022
    Metadata
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    Abstract
    Colonisation of decaying leaves fallen from mangrove trees by bacteria and fungi is thought to play an important role at the base of food webs in most tropical estuaries. Compound-specific isotope analysis of amino acids (CSIA-AA) has enabled the previously difficult methodological task of measuring plant, bacterial and fungal energy flows to food webs. Here, we assessed the biosynthetic origins of amino acids at the base of a mangrove food web using the CSIA-AA approach. Trophic positions of the 2 most common mangrove fauna—fiddler crabs and sesarmid crabs—estimated from nitrogen isotopes in phenylalanine and glutamic acid ...
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    Colonisation of decaying leaves fallen from mangrove trees by bacteria and fungi is thought to play an important role at the base of food webs in most tropical estuaries. Compound-specific isotope analysis of amino acids (CSIA-AA) has enabled the previously difficult methodological task of measuring plant, bacterial and fungal energy flows to food webs. Here, we assessed the biosynthetic origins of amino acids at the base of a mangrove food web using the CSIA-AA approach. Trophic positions of the 2 most common mangrove fauna—fiddler crabs and sesarmid crabs—estimated from nitrogen isotopes in phenylalanine and glutamic acid approached 2, suggesting that these species are herbivores rather than microbivores. Consistent with this finding, carbon isotope fingerprints in AAs did not support the importance of essential AAs derived from fungi and bacteria but rather suggested the importance of those originating from plants, especially microalgae. These results suggest that (1) microbial mineralization of decaying leaves supports the production of more easily assimilated microalgae and (2) bacteria and fungi, as intermediates, also routinely incorporate plant-derived AAs into their biomass.
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    Journal Title
    Marine Ecology Progress Series
    Volume
    681
    DOI
    https://doi.org/10.3354/meps13924
    Copyright Statement
    © 2022 Inter Research. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Ecology
    Zoology
    Oceanography
    Science & Technology
    Life Sciences & Biomedicine
    Physical Sciences
    Ecology
    Marine & Freshwater Biology
    Publication URI
    http://hdl.handle.net/10072/412278
    Collection
    • Journal articles

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