Structuration spatiale des traits d'histoire de vie de la sole commune en Manche Est

Abstract : To understand connectivity between demographic subunits of a fishing stock allow to adapt management measures to the stock dynamic. Indirect methods, whose the use of life story traits as natural makers of individual origin or the study of their variations at small scale can allow to describe and quantify subunit connectivity. East English Channel (EEC) common sole (Solea solea) stock is considered as overexploited but this consideration ignores the three subunits structuration hypothesis. Individual somatic growth curves were back calculated with annual otolith increments of individuals caught in the three areas in the EEC supposed to be three subunits. Juvenile growth profile in each are allowed to assign an origin area to adult individuals based on their juvenile growth with a 62% success rate. Calculated connectivity matrixes indicate an independency of adults distribution in the three subareas relative to their origin area. Somatic growth profiles, which are described by Von Bertalanffy models slightly vary between areas at adult stage and is strongly dependent from juvenile origin areas. Overall, our analyses do not detect signal of stock structuration in subunits reproductively isolated and only suggest a larvae and juvenile spatial separation.
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Master Thesis
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Alaia Morell. Structuration spatiale des traits d'histoire de vie de la sole commune en Manche Est. Sciences du Vivant [q-bio]. 2018. ⟨dumas-01971635⟩

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