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Autochthonous and allochthonous contributions to mesozooplankton diet in a tidal river and estuary: integrating carbon isotope and fatty acid constraints
Van den Meersche, K.; Van Rijswijk, P.; Soetaert, K.; Middelburg, J.J. (2009). Autochthonous and allochthonous contributions to mesozooplankton diet in a tidal river and estuary: integrating carbon isotope and fatty acid constraints, in: Van den Meersche, K. Carbon flows in the planktonic food web of temperate estuaries: a combined approach using stable isotopes, biomarkers and modeling. pp. 73-96
In: Van den Meersche, K. (2009). Carbon flows in the planktonic food web of temperate estuaries: a combined approach using stable isotopes, biomarkers and modeling. PhD Thesis. Universiteit Gent, Vakgroep Biologie, Sectie Mariene Biologie: Gent. 199 pp.
Related to:
Van den Meersche, K.; Van Rijswijk, P.; Soetaert, K.; Middelburg, J.J. (2009). Autochthonous and allochthonous contributions to mesozooplankton diet in a tidal river and estuary: integrating carbon isotope and fatty acid constraints. Limnol. Oceanogr. 54(1): 62-74. https://dx.doi.org/10.4319/lo.2009.54.1.0062, more

Available in  Authors 

Keywords
    Acids > Organic compounds > Organic acids > Fatty acids
    Algae
    Algae > Diatoms
    Aquatic communities > Plankton > Phytoplankton
    Aquatic communities > Plankton > Zooplankton
    Behaviour > Feeding behaviour > Grazing
    Diets
    Estuarine environment
    Isotopes > Carbon isotopes
    Microorganisms > Bacteria
    Organic matter > Carbon > Organic carbon > Dissolved organic matter > Dissolved organic carbon
    Organic matter > Particulates > Particulate organic matter > Organic carbon > Particulate organic carbon
    Population characteristics > Biomass
    Bacillariophyceae [WoRMS]; Chlorophyta [WoRMS]
    Belgium, Schelde R. [Marine Regions]
    Marine/Coastal; Brackish water; Fresh water

Authors  Top 
  • Van den Meersche, K.
  • Van Rijswijk, P.
  • Soetaert, K., more
  • Middelburg, J.J., more

Abstract
    We examined the carbon sources used by bacteria and mesozooplankton in the Scheldt River and estuary (Belgium, The Netherlands) using a combined stable isotope and fatty acid composition approach. Water samples were collected monthly at six stations during 1 yr and analyzed for 13C of dissolved inorganic carbon, dissolved organic carbon (DOC), and particulate organic carbon (POC). Mesozooplankton was determined up to family, genus, or species level and analyzed for 13C and fatty acid content. Suspended particles were analyzed for phospholipid fatty acids and their 13C contents to estimate isotope ratios of phytoplankton groups and heterotrophic bacteria. The carbon isotope signatures of DOC, POC, and bacterial biomass were similar and significantly enriched relative to those of diatoms and green algae, pointing to allochthonous subsidies as an important carbon source for bacteria. The contribution of algae to zooplankton diets as estimated from isotope ratios and fatty acid profiles averaged 41% and 75% respectively, and did not differ significantly among stations, taxa, or age categories. Mesozooplankton relies primarily on grazing on phytoplankton and direct consumption of particulate organic matter. Mesozooplankton appears to receive little of its carbon from DOC via bacteria.

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