Plasticity of trophic interactions in fish assemblages results in temporal stability of benthic-pelagic couplings

Timmerman, C.-A., Giraldo, C., Cresson, P., Ernande, B., Travers-Trolet, M., Rouquette, M., Denamiel, M., & Lefebvre, S. (2021). Plasticity of trophic interactions in fish assemblages results in temporal stability of benthic-pelagic couplings. Marine Environmental Research 170 e105412. 10.1016/j.marenvres.2021.105412.

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: Food webs; Stable isotopes; Biomass; Isotopic functional indices; Flux
Research Programs: Evolution and Ecology (EEP)
Depositing User: Luke Kirwan
Date Deposited: 19 Jul 2021 08:25
Last Modified: 19 Jul 2021 08:25
URI: http://pure.iiasa.ac.at/17336

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