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    Changes in zooplankton community, and seston and zooplankton fatty acid profiles at the freshwater/saltwater interface of the Chowan River, North Carolina

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    Author
    Lichti, Deborah A.
    Rinchard, Jacques
    Kimmel, David G.
    Lichti, Deborah
    Rinchard, Jacques
    Kimmel, David G.
    Keyword
    Zooplankton
    Fatty Acid
    Estuarine Systems
    Freshwater
    Seston
    Community
    Journal title
    PeerJ
    Date Published
    2017-08-16
    
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    URI
    http://hdl.handle.net/20.500.12648/2273
    Abstract
    The variability in zooplankton fatty acid composition may be an indicator of larval fish habitat quality as fatty acids are linked to fish larval growth and survival. We sampled an anadromous fish nursery, the Chowan River, during spring of 2013 in order to determine how the seston fatty acid composition varied in comparison with the zooplankton community composition and fatty acid composition during the period of anadromous larval fish residency. The seston fatty acid profiles showed no distinct pattern in relation to sampling time or location. The mesozooplankton community composition varied spatially and the fatty acid profiles were typical of freshwater species in April. The Chowan River experienced a saltwater intrusion event during May, which resulted in brackish water species dominating the zooplankton community and the fatty acid profile showed an increase in polyunsaturated fatty acids (PUFA), in particular eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). The saltwater intrusion event was followed by an influx of freshwater due to high precipitation levels in June. The zooplankton community composition once again became dominated by freshwater species and the fatty acid profiles shifted to reflect this change; however, EPA levels remained high, particularly in the lower river. We found correlations between the seston, microzooplankton and mesozooplankton fatty acid compositions. Salinity was the main factor correlated to the observed pattern in species composition, and fatty acid changes in the mesozooplankton. These data suggest that anadromous fish nursery habitat likely experiences considerable spatial variability in fatty acid profiles of zooplankton prey and that are correlated to seston community composition and hydrodynamic changes. Our results also suggest that sufficient prey density as well as a diverse fatty acid composition is present in the Chowan River to support larval fish production.
    Citation
    Lichti et al. (2017), Changes in zooplankton community, and seston and zooplankton fatty acid profiles at the freshwater/saltwater interface of the Chowan River, North Carolina. PeerJ 5:e3667; DOI 10.7717/peerj.3667
    DOI
    https://doi.org/10.7717/peerj.3667
    Description
    Attribution 4.0 International (CC BY 4.0) --- Funding This work was funded by NSF Grant DEB-0951414 to DG Kimmel. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Grant Disclosures The following grant information was disclosed by the authors: NSF: DEB-0951414. Supplemental information for this article can be found online at http://dx.doi.org/10.7717/ peerj.3667#supplemental-information.
    ae974a485f413a2113503eed53cd6c53
    https://doi.org/10.7717/peerj.3667
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