Pêche récréative ou commerciale : quel impact sur les stocks d'étrilles (Necora puber) européens ? : une approche de génétique de la conservation

Abstract : Nowadays, population expansion and human growing needs in term of services provided by ecosystems biodiversity has become one of the major issues of conservation biology. Fisheries development and the resulting over-exploitation of marine species are heavily impacting marine resources and can furthermore lead to a genetic diversity tumble undermining species adaptive abilities. The GIPREOL transdisciplinary program, conducted by the University of La Rochelle and IODDE partnership, intends on measuring the consequences of coastal development and providing an accordingly suitable and sustainable management plan for the Marennes-Oléron territory. Our study focuses on the velvet swimming crab (Necora puber), a decapod crustacean highly targeted by both professional and recreational fisheries. In order to assess the impacts of such exploitation on Necora puber populations along the eastern coasts of Europe, we analyse the genetic polymorphism of the COI mitochondrial gene and 10 microsatellites loci from 29 European sites with contrasted degrees of anthropogenic pressures. Our results depicted a clear signature of recent demographic expansion from the last glacial maximum of the Pleistocene era combined with an overall low polymorphism. As for the genetic structure within the zone, microsatellites markers revealed a recent differentiation of populations, raising issues concerning the velvet swimming crab European populations future. Lastly, the dispersal abilities of the species were investigated and showed a significant dispersal potential over large distances.
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Joana Do Nascimento. Pêche récréative ou commerciale : quel impact sur les stocks d'étrilles (Necora puber) européens ? : une approche de génétique de la conservation. Sciences agricoles. Université de La Rochelle, 2013. Français. ⟨NNT : 2013LAROS392⟩. ⟨tel-01124309⟩

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