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Microsatellite analysis of population structure in the shortfin mako (Isurus oxyrinchus)

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Abstract:

Microsatellite analysis of the shortfin mako shark (Isurus oxyrinchus) revealed very weak evidence of population structure. Samples collected from the North Atlantic, South Atlantic, North Pacific, South Pacific, and Atlantic, and Pacific coasts of South Africa were screened at four microsatellite loci. Multilocus measures of population subdivision were much lower than expected (FST = 0.0014, P = 0.1292; RST = 0.0029, P = 0.019). Power analysis revealed that the study had a high level of power (>0.995) to detect the magnitude of FST expected based on a previous study of mtDNA and assumptions of equal male and female dispersal. Thus, integrating the results from microsatellite- and mitochondrial-based studies may provide evidence for gender-biased dispersal for the shortfin mako.

Une analyse des microsatellites chez le mako à nageoires courtes (Isurus oxyrinchus) montre peu d'indications d'une structure de population. Quatre locus microsatellites ont été analysés dans des échantillons de l'Atlantique Nord, de l'Atlantique Sud, du Pacifique Nord, du Pacifique Sud et des côtes atlantique et pacifique de l'Afrique du Sud. Les mesures de subdivision de la population basées sur plusieurs locus sont plus faibles que ce à quoi on s'attendait (FST = 0,0014, P = 0,1292; RST = 0,0029, P = 0,019). Une analyse de puissance indique que l'étude possède un haut niveau de puissance (puissance >0,995), permettant de détecter la valeur de FST attendue d'après une étude antérieure de l'ADNmt et les présuppositions de dispersion égale des mâles et des femelles. Ainsi, l'intégration des résultats des études sur les microsatellites et sur les mitochondries pourra peut-être fournir des indices d'une dispersion différente selon le sexe chez le mako à nageoires courtes.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2003-06-01

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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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