Poster De Conférence Année : 2021

Importance of grey mullets on coastal food webs in a context of omega-3 deficiency: from sub-individual level to trophic dynamics

Résumé

It is now recognized that at its current rate, global change will lead to a reduction in the production of long-chain omega-3 fatty acids at the base of the marine food web, as a result of the alteration of microalgal assemblages and their physiology. These omega-3 have a vital role in maintaining the physiological functions of higher organisms and a decrease in their production at the base of the marine food web should mechanically have repercussions on the availability of these nutrients for primary and secondary consumers, such as marine fish, almost incapable of synthesizing them. Grey mullets are opportunistic fish that occupy a diversity of habitats and tolerate a wide range of environmental conditions. They generally occupy an intermediate position in coastal food webs: they graze on microalgal biofilm, and are eaten by other exploited fish species. They therefore play a central role in the coupling between the bottom trophic compartments and those of the water column, and thus contribute to the transfer of omega-3 to humans. Recent experimental results on the golden mullet have shown that some of its physiological and behavioral performances are altered in response to trophic deficiency in omega-3, but the consequences of these changes at higher integration levels and in particular in the trophic network remain misknown. The aim of this study is to propose a modelling approach allowing the integration of ecophysiological data into a suite of models in order to estimate the impact of these changes on coastal food webs. DEB (Dynamic Energy Budget) models have been developed for the two species of grey mullets present in the bay of Marennes-Oléron in order to force a dynamic and non-deterministic multi-specific trophic model, and to simulate the possible changes in the characteristics of this trophic network under constraints of trophic reduction of omega-3.

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hal-04678871 , version 1 (27-08-2024)

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  • HAL Id : hal-04678871 , version 1

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Pierre Bourdaud, Géraldine Lassalle, Nathalie Niquil, Marie Vagner. Importance of grey mullets on coastal food webs in a context of omega-3 deficiency: from sub-individual level to trophic dynamics. Advances in Marine Ecosystem Modelling Research Symposium, 2021, Virtual conference, France. ⟨hal-04678871⟩
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