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Les Décapodes Natantia De L'Estuaire De La Gironde (France). Contribution a L'Étude Morphologique Et Biologique De Palaemon Longirostris H. Milne Edwards, 1837

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The carcinological fauna of the Gironde estuary (south-western France) includes eight species of Decapoda Natantia belonging to three different faunistic categories. Palaemon longirostris is a typically estuarine prawn, the range of which extends over some 130 kilometres from Pointe de Grave to Cadillac (Garonne River). The main morphological characters of this species are described: rostral shape, structure of antennae 1 and mandibular palp, relative length of the segments of pereiopod 2. In the estuarine area, the diet of the adults consists of local Mysidacea: Neomysis integer upstream, and Mesopodopsis slabberi downstream. In the estuary, mysis larvae are found from late June to late July; their density is higher downstream near the banks than upstream. During metamorphosis, the larval stages migrate upstream, favoured by the existence of residual bottom currents in the same direction.

Affiliations: 1: CNRS - Université de Bordeaux I, 2 rue Jolyet, 33120 Arcachon, France


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