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


Gene flow among giant clam (Tridacna gigas) populations in Pacific does not parallel ocean circulation
Authors:J A H Benzie  S T Williams
Institution:(1) Australian Institute of Marine Science, Townsville MC, PMB No. 3, 4810 Townsville, Queensland, Australia
Abstract:Tridacna gigas (L.) populations were sampled from 13 locations throughout the west Pacific in 1990–1991 and screened for allozyme variation at seven polymorphic loci. Significant genetic differences were found between the few large stocks of T. gigas remaining in the world. Cluster analysis identified two major regional groups of populations: a ldquoCentral Pacificrdquo group consisting of Kiribati and the Marshall Islands, and a ldquoWest Pacificrdquo group comprising all other populations. Within the latter group, the Great Barrier Reef populations were significantly differentiated from those in the Solomon Islands. The main routes of gene flow did not run parallel with known major surface currents as might be expected, but crossed them. Gene exchange was limited east-west between the Central and West Pacific groups and the GBR and the Solomon Islands. The lack of correspondence between the major surface currents and the routes of gene flow suggests that the genetic structure of T. gigas reflects historical patterns of migration that no longer occur, rather than presentday dispersal. These findings raise fundamental questions concerning the origin and maintenance of genetic diversity in Pacific faunas, and have important implications for the mariculture and conservation of T. gigas.
Keywords:
本文献已被 SpringerLink 等数据库收录!
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