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

• Published in: Canadian journal of fisheries and aquatic sciences Vol. 60; no. 6; pp. 670 - 675
• Main Authors: Schrey, Aaron W, Heist, Edward J
• Format: Journal Article
• Language: English
• Published: Ottawa, Canada NRC Research Press 01.06.2003; National Research Council of Canada; Canadian Science Publishing NRC Research Press
• Subjects: Animal populations; Animal, plant and microbial ecology; Animals; Applied ecology; Aquatic life; Aquatic reptiles; Biological and medical sciences; Coasts; Dispersal; Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.); Females; Fish populations; Fundamental and applied biological sciences. Psychology; Genetic markers; Genetics; Genetics of eukaryotes. Biological and molecular evolution; Isurus oxyrinchus; Larvae; Life history; Marine; Marine fish; Marine mammals; Ocean basins; Offspring; Overfishing; Population; Population genetics, reproduction patterns; Population structure; Satellites; Sharks; Tracking; Vertebrata; Atlantic Ocean; Pacific Ocean; PSW, South Africa; AN, North Atlantic; INE, USA; ANW, USA; ANE, Spain; ASW, Brazil; IS, South Pacific; PSW, South Atlantic; IN, North Pacific; PSW, South Pacific; PSE, South Pacific; AS, South Atlantic; Marine environment; Vertebrata; Genetic variability; Pisces; Microsatellite DNA; Population structure; Molecular marker; Chondrichthyes; Spatial variation; Population genetics
• ISSN: 0706-652X; 1205-7533
• DOI: 10.1139/f03-064

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 (F ST = 0.0014, P = 0.1292; R ST = 0.0029, P = 0.019). Power analysis revealed that the study had a high level of power (>0.995) to detect the magnitude of F ST 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.