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Life history variation parallels phylogeographical patterns in North American walleye (Sander vitreus) populations

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Abstract:

Walleye (Sander vitreus) is a native fish species in North America, and its zoogeographic range covers several climatic zones. Using multivariate statistical approaches and published growth data, we explored the association between climatic conditions (frost frequency, precipitation, air temperature, solar radiation, and cloud cover) and growth of walleye from 89 populations in North America. We found significant concordance between climatic conditions and walleye growth; however, the pattern of concordance differed among populations that originated from geographical regions that were colonized from different glacial refugia. This suggests that contemporary differences in walleye growth patterns related to local climatic conditions may have been shaped by evolutionary divergence that occurred among refugia during the last glaciation. We suggest that caution should be taken when assessing possible effects of climate variation and climate change on the life history traits of different walleye and other fish populations, especially when such assessments potentially include several genetically distinct groups. Procrustes analysis was shown to be an effective tool for characterizing how a multivariate set of response variables change in response to generalized changes in a multivariate set of independent variables.

Le doré (Sander vitreus) est un poisson indigène d’Amérique du Nord dont la répartition géographique couvre plusieurs zones climatiques. Des méthodologies statistiques multidimensionnelles et des données de croissance tirées de la littérature nous ont servi à explorer l’association entre les conditions climatiques (fréquence des gels, précipitations, température de l’air, radiation solaire et nébulosité) et la croissance des dorés de 89 populations nord-américaines. Il existe une concordance significative entre les conditions climatiques et la croissance des dorés; cependant, les patrons de concordance diffèrent entre les populations qui proviennent de régions géographiques colonisées à partir de refuges glaciaires différents. Cela laisse croire que les différences actuelles dans les patrons de croissance des dorés reliées aux conditions climatiques locales ont pu être façonnées par la divergence évolutive qui s’est développée entre les refuges durant la dernière glaciation. Nous croyons qu’il faut être prudent lorsqu’on évalue les effets possibles de la variation climatique et du changement climatique sur les caractéristiques démographiques des différentes populations de dorés ou d’autres poissons, particulièrement si de telles évaluations incluent potentiellement plusieurs groupes qui sont génétiquement distincts. L’analyse Procuste s’est avérée être un outil efficace pour caractériser la manière dont un ensemble multidimensionnel de variables de réponse change en réaction à des changements généralisés dans un ensemble multidimensionnel de variables indépendantes.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2008

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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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