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MEPS 273:163-172 (2004)
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Abstract
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Invasion by the marine gastropod Ocinebrellus inornatus in France. II. Expansion along the Atlantic coast
C. Martel1, F. Viard2, D. Bourguet3,4, P. Garcia-Meunier1,*
1Laboratoire de Biologie et Environnement Marin, Université de La Rochelle, Institut de la Mer et du Littoral, Avenue Lazaret, Port des Minimes, 17000 La Rochelle, France
2Station Biologique de Roscoff, UMR 7127, Equipe EGPM, Place Georges Teissier, BP 74, 29682 Roscoff cedex, France
3Unité de Génétique Microbienne et Environnement, Institut National de la Recherche Agronomique, La Minière, 78285 Guyancourt, France
4Centre de Biologie et de Gestion des Populations (CBGP), Institut National de la Recherche Agronomique, Campus International de Baillarguet, 34988 Montferrier/Lez, France
*Corresponding author. Email: pgarciam@univ-lr.fr
ABSTRACT: Dispersal ability is key to the spreading of exotic species to new areas. Herein, we focus on the expansion processes along the French Atlantic coast of an exotic marine gastropod, Ocinebrellus inornatus, first detected in the
Marennes-Oléron bay in 1995. Unlike many aquatic invaders, O. inornatus lacks a swimming larval stage. This feature may reduce its ability to expand within the area of introduction unless counterbalanced by human-mediated spreading. By analyzing
the genetic diversity at 7 allozyme markers, we compared the genetic diversity and structure of 9 French, 3 American and 5 Asian (native) populations. The genetic differentiation between populations within each area was low and of similar magnitude.
However, a genetic isolation by coastline distances was detected in Asia only. We draw 2 main conclusions from these results. First, the settlement of new populations along the French Atlantic coast is not associated with drastic founder events. Second,
expansion along the French coast is enhanced by oyster-farming activities.
KEY WORDS: Colonization · Introduced species · Direct-developing species · Population genetics · Allozyme markers · Ocinebrellus inornatus
Full text in pdf format
Published in MEPS Vol.
273
(2004) on June 8
Print ISSN: 0171-8630; Online ISSN: 1616-1599.
Copyright © Inter-Research, Oldendorf/Luhe, 2004
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