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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Invertebrate dispersal by aquatic mammals: a case study with nutria Myocastor coypus (Rodentia, Mammalia) in Southern France (2010)
Auteurs :	Aline Waterkeyn, Auteur ; Olivier Pineau, Auteur ; Patrick Grillas, Auteur ; Luc Brendonck, Auteur
Type de document :	Article
Dans :	Hydrobiologia (654(1) OCT 2010)
Article en page(s) :	267-271
Langues:	Anglais
Mots-clés :	TdV ; Camargue ; Myocastor coypus ; Invertebrata ; Dispersion
Résumé :	Many freshwater invertebrates rely on vectors for their passive dispersal. A wide array of vectors has already been investigated, but dispersal mediated by aquatic mammals remains largely unknown. Since nutria (Myocastor coypus Molina, 1782) live in a variety of aquatic habitats and frequently move around between these water bodies, they have the opportunity to transport hitch-hiking aquatic invertebrates along with them. We investigated the presence of aquatic invertebrates in their fur to evaluate this hypothesis. This study demonstrates the feasibility of ectozoochory in a broad array of freshwater invertebrates by nutria on a local scale. More than 800 invertebrates of 14 different taxa were retrieved from the fur of 10 nutria specimens, including cladocerans, copepods, ostracods, rotifers, bryozoans, dipterans, nematodes, annelids and collembolans. Many of these freshwater invertebrates could survive at least 30 min in the moist fur of nutria. Therefore, we can state that besides modifying aquatic habitats physically by clearing vegetation or digging, nutria may also alter invertebrate communities by introducing new species or genotypes.

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