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The impact of postglacial marine invasions on the genetic diversity of an obligate freshwater fish, the longnose dace (Rhinichthys cataractae), on the Quebec peninsula

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Postglacial seas are expected to have had significant effects on the genetic structure of populations of obligate freshwater fishes. To assess this influence, mitochondrial DNA variability was evaluated in 32 populations of longnose dace (Rhinichthys cataractae) of the Quebec peninsula located within and outside of the maximum extent of marine invasions of the Champlain and Laflamme seas. Three clades of haplotypes diverging from one to two mutations were defined. Despite this low divergence, a clear and significant spatial genetic structure was observed outside of the extent of marine invasions. However, a higher genetic diversity was observed in populations located within the extent of marine invasions because of the admixture of these clades with an additional lineage restricted almost exclusively to those areas. The low genetic divergence between the main haplotypes suggests a single origin, despite the known presence of this species in various refuges. Marine invasions preventing entry to the peninsula, especially from Atlantic refuge, are proposed as a possible explanation to this particular result. This study is a relevant argument for integrating postglacial marine invasions into postglacial colonization models of freshwater species in the northeastern part of North America.

Les mers postglaciaires ont possiblement eu les effets significatifs sur la structure génétique des populations des poissons d'eau douce. Afin de vérifier cet effet, la variabilité mitochondriale a été évaluée dans 32 populations de naseux des rapides (Rhinichthys cataractae), situées à l'intérieur et à l'extérieur des frontières des mers de Champlain et de Laflamme, qui ont inondé la péninsule québécoise au cours de la dernière déglaciation. Trois clades d'haplotypes divergeant d'une à deux mutations ont été trouvés. Les populations situées à l'extérieur des zones inondées par les invasions marines ont montré une forte structure spatiale. Cependant, une plus grande diversité génétique due au mélange des trois clades et d'une lignée évolutive supplémentaire a été observée à l'intérieur des limites des mers postglaciaires. La faible divergence entre les trois principaux clades suggère une origine commune malgré la présence de cette espèce dans plusieurs des refuges glaciaires connus. Les invasions marines agissant comme barrières à la colonisation, surtout depuis le refuge de l'Atlantique, sont proposées comme explication possible à ce résultat. Cette étude représente ainsi un argument pertinent pour l'intégration des invasions marines dans les modèles décrivant la colonisation postglaciaire des espèces d'eau douce dans le nord-est de l'Amérique du Nord.

Document Type: Research Article

Publication date: 2006-06-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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