Genetic structure of deep-water redfish, Sebastes
mentella, populations across the North Atlantic |
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Authors: | S Roques J-M Sévigny L Bernatchez |
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Institution: | GIROQ, Département de biologie, Université Laval, Sainte-Foy, Quebec G1K 7P4, Canada, Direction des invertébrés et de la biologie expérimentale, Institut Maurice-Lamontagne, Ministère des Pêches et des Océans, C.P. 1000, Mont-Joli, Quebec PQ G5H 3ZH, Canada,
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Abstract: | Patterns of genetic diversity of the marine deep-water redfish, Sebastes mentella Travin, from 21 sampling locations (n=46 per sample, from 1995 to 1998) were examined throughout its range in the North Atlantic. Eight microsatellite loci were used in order to: (1) define the genetic structure and consider the possible influence of dispersal, geographic distance, oceanic currents and historical factors; and (2) relate the structure to present management units and practices. Three divergent population units (mean =0.012) associated with distinct geographic areas were defined: Eastern (Norway and Barents Sea), Panoceanic and Western (Gulf of St. Lawrence and offshore Newfoundland). The most important observation was the lack of genetic differences (mean =-0.0004) and lack of genetic isolation by geographic distance (r=0.318, P=0.112) among samples within the Panoceanic zone, from the Faroe Islands to the Grand Banks (6,000 km). A combination of vicariance, historical introgression with a closely related species, S. fasciatus, and contemporary patterns of oceanic circulation are likely to have shaped the observed population structure. These results only partially support current management units, and call for more integrated practices for regulating the exploitation of S. mentella throughout its extensive range. |
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