期刊
MARINE ENVIRONMENTAL RESEARCH
卷 170, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2021.105412
关键词
Food webs; Stable isotopes; Biomass; Isotopic functional indices; Flux
资金
- INTERREG IV A France (Channel) -England cross-border European cooperation programme - European Regional Development Fund
- Ifremer Scientific Direction through a Politique de Site incitative grant
- Marine Strategy Framework Directive (MSFD) - French Ministry for Ecology, Sustainable Development and Energy
- French Region Hauts-de-France and the Foundation for Research on Biodiversity [2014-10824]
- Recherche Marine en Cote d'Opale (CPER MARCO 2015-2020) - European Union (ERDF)
- French Government
- French Region Hauts-de-France and Ifremer
- ISIT-U project by the French government through the Programme Investissement d'Avenir [I-SITE ULNE/ANR-16-IDEX0004 ULNE]
- European Marine Fisheries Fund and France Filiere Peche (2017-2020 VARITROPH project)
This study found that the coupling between benthic and pelagic habitats in the Eastern English Channel is a permanent feature, potentially favored by shallow depth and driven by two trophic processes. Resource partitioning and the presence of generalist species allow fish to fully utilize available resources, maintaining the coupling between benthic and pelagic habitats.
This study addresses the temporal variability of couplings between pelagic and benthic habitats for fish assemblages at five periods in a shallow epicontinental sea, the Eastern English Channel (EEC). Organic matter fluxes fueling fish assemblages and the relative contribution of their different sources were assessed using stable isotope analysis and associated isotopic functional metrics. Couplings between benthic and pelagic realms appeared to be a permanent feature in the EEC, potentially favored by shallow depth and driven by the combination of two trophic processes. First, trophic interactions exhibited plasticity and revealed resource partitioning. Second, changes in the composition of fish assemblages did not impact benthic-pelagic couplings, as most dominant species were generalists during at least one time period, allowing complete use of available resources. Examining both unweighted and biomass-weighted indices was complementary and permitted a better understanding of trophic interactions and energy fluxes.
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