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Size At Sexual Maturity and Morphometric Variability in Three Populations of a Ustropotamobi Us Pallipes Pallipes (Lereboullet, 1858) According To a Restocking Strategy

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Size at sexual maturity was determined by the allometric equation in three populations of Austropotamobius pallipes pallipes from the Poitou-Charentes region, France. Seven morphological characters were measured and POL (post orbital length) was used as a reference parameter. The puberal moult was identified by changes in the relative growth of CW (claw width) and CL (claw length) in both sexes. Males have shown variation of the relative growth of CW and CL at 19.15 mm of POL for the Gatineau (Gat) stream, 20.1 mm of POL for the Magnerolle (Mag) and 20.3 mm for the Fontaine Saint-Pierre (Fsp) populations, respectively. Sexual maturity of females occurred at 16.17 mm POL for the Fsp, 18.2 mm for the Mag and for the Gat. Geographic variation in A. pallipes was investigated using multivariate analysis of five morphometric characters on mature specimens. By canonical discriminant analysis, the Mag population was distinct from the other two populations. Results are discussed with regard to restocking strategy.

Affiliations: 1: Université de Poitiers, Laboratoire de Biologic Animale, URA CNRS n° 1975, 40 Avenue du Recteur Pineau, F-86022 Poitiers cédex, France


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