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Geometric morphometrics of carapace of Macrobrachium australe (Crustacea: Palaemonidae) from Reunion Island

Authors

  • Gabrielle Zimmermann,

    1. Muséum National d’Histoire Naturelle, UMR CNRS 7208, Département Milieux et Peuplements Aquatiques, 43 rue Cuvier, 75005 Paris, France
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  • Pierre Bosc,

    1. Association Réunionnaise pour le Développement de l’Aquaculture, Z.I. Les Sables – BP 16 – 97427 Etang-Salé, La Réunion, France
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  • Pierre Valade,

    1. Association Réunionnaise pour le Développement de l’Aquaculture, Z.I. Les Sables – BP 16 – 97427 Etang-Salé, La Réunion, France
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  • Raphaël Cornette,

    1. Muséum National d’Histoire Naturelle, UMR CNRS 7205, Département Systématique et Evolution, 45 rue Buffon, 75005 Paris, France
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  • Nadia Améziane,

    1. Muséum National d’Histoire Naturelle, UMR CNRS 7208, Département Milieux et Peuplements Aquatiques, 43 rue Cuvier, 75005 Paris, France
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  • Vincent Debat

    1. Muséum National d’Histoire Naturelle, UMR CNRS 7205, Département Systématique et Evolution, 45 rue Buffon, 75005 Paris, France
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Vincent Debat, Muséum National d’Histoire Naturelle, UMR CNRS 7205, Département Systématique et Evolution, 45 rue Buffon, 75005 Paris, France. E-mail: debat@mnhn.fr

Abstract

Zimmermann, G., Bosc, P., Valade, P., Cornette, R., Améziane, N. and Debat, V. 2011. Geometric morphometrics of carapace of Macrobrachium australe (Crustacea: Palaemonidae) from Reunion Island. —Acta Zoologica (Stockholm) 93: 492–500.

We investigated the structure of carapace shape variation in six populations of Macrobrachium australeGuérin-Méneville 1838 (Crustacea: Decapoda: Palaemonidae) from Reunion Island (Indian Ocean) freshwaters. The morphometric analysis revealed the occurrence of two morphotypes corresponding to two different types of habitats. Individuals living in lotic habitats present a thick carapace armed with a short, robust and straight rostrum, while individuals from lentic habitats have a slender carapace armed with a thin long rostrum orientated upward. This difference suggests an adaptation to lotic disturbances and is tentatively interpreted as adaptive phenotypic plasticity. In such amphidromous organisms regressing to freshwaters after a marine larval phase, selection for physiological and developmental flexibility might facilitate further adaptation and allows the colonisation of a wide panel of environmentally different and sometimes geographically distant insular streams.

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