首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Global population structure of the tope (Galeorhinus galeus) inferred by mitochondrial control region sequence data
Authors:C L CHABOT  L G ALLEN†
Institution:Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA 90095-1606, USA;, Department of Biology, California State University, Northridge, CA 91330-8303, USA
Abstract:In order to properly manage and conserve exploited shark species, detailed analyses of their population structure is needed. Global populations of Galeorhinus galeus are in decline due to the exploitation of the fishery over the past 80 years. Currently, the genetic structure of eastern Pacific populations of G. galeus is not known and recent observations in the northeastern Pacific suggest an increase in numbers. To evaluate gene flow among populations of G. galeus , 116 samples were collected and analysed from six geographically dispersed locations: Australia, North America, South Africa, South America (Argentina and Peru), and the UK. Analysis of 968 to 1006 bp of the 1068-bp mitochondrial control region revealed 38 unique haplotypes that were largely restricted to their collecting locality. Significant genetic structure was detected among populations (ΦST = 0.84; P  < 0.000001) and migration estimates were low ( Nm  = 0.05–0.97). Due to an apparent lack of migration, populations of G. galeus appear to be isolated from each other with little to no gene flow occurring among them. As a consequence of this isolation, increasing numbers of G. galeus in the northeastern Pacific can be best explained by local recruitment and not by input from geographically distant populations.
Keywords:conservation genetics  mitochondrial DNA  phylogeography  shark
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号