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Population structure of copper rockfish (Sebastes caurinus) reflects postglacial colonization and contemporary patterns of larval dispersal

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The copper rockfish (Sebastes caurinus) is a benthic, nonmigratory, rocky reef species with pelagic larval and juvenile stages lasting several months. Adults are commonly distributed in temperate coastal waters of the Pacific Ocean from British Columbia to southern California, including the inland waterways of Puget Sound, Washington, a semi-enclosed fjord system of known postglacial origin. Here, we report the distribution of genetic variation at six microsatellite DNA loci from six locations throughout the species' range. Among four coastal samples, significant population subdivision was detected (FST = 0.007), and a significant correlation between genetic and geographic distance was observed. Divergence was large and significant between Puget Sound proper and coastal samples (FST = 0.087). A sample taken only 100 km north of Puget Sound (the Canadian Gulf Islands) was also highly divergent from Puget Sound and coastal samples and was genetically intermediate between the two. The Puget Sound sample also displayed significantly lower allelic diversity and a more substantial presence of private alleles. The patterns of genetic divergence and diversity are most consistent with a historical colonization followed by limited oceanographic exchange among geographically proximate locations.

Le sébaste cuivré (Sebastes caurinus) est une espèce benthique et non migratrice qui habite les récifs rocheux et dont les larves pélagiques et les jeunes stades se développent pendant plusieurs mois. Les adultes se retrouvent communément dans les eaux côtières tempérées du Pacifique, de la Colombie-Britannique au sud de la Californie, y compris dans les eaux intérieures de Puget Sound, Washington, un système de fjord semi-fermé qu'on sait être d'origine post-glaciaire. On trouvera ici un examen de la distribution de la variation génétique de six locus d'ADN microsatellite de six localités dans l'aire de répartition de l'espèce. Dans quatre échantillons provenant des régions côtières, on observe une subdivision significative de la population (FST = 0,007) et il existe une corrélation significative entre les distances génétique et géographique. Il y a une importante divergence entre les échantillons de la côte et ceux de Puget Sound (FST = 0,087). Un échantillon récolté seulement 100 km au nord de Puget Sound (les îles du Golfe canadiennes) diffère considérablement des échantillons de Puget Sound et de la côte et se situe génétiquement entre les deux. L'échantillon de Puget Sound possède aussi significativement moins de diversité allélique et un plus grand nombre d'allèles spécifiques à cette population. Ces patterns de divergence et de diversité génétiques s'accordent bien avec l'hypothèse d'une colonisation dans le passé, suivie par des échanges limités entre ces régions géographiquement proches.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2002-08-01

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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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