Patterns of geographic variation between mitochondrial and nuclear markers in Heaviside’s(Benguela)dolphins(Cephalorhynchus heavisidii)  

作　　者：Keshni GOPAL Leszek KARCZMARSKI Krystal A.TOLLEY 

机构地区：[1]Mammal Research Institute,University of Pretoria,Pretoria,South Africa [2]South African National Biodiversity Institute,Kirstenbosch Research Centre,Cape Town,South Africa [3]School of Biological Sciences,University of Hong Kong,Hong Kong,China [4]Cetacean Ecology Lab,Cetacea Research Institute,Hong Kong,China [5]Centre for Ecological Genomics and Wildlife Conservation,Department of Zoology,University of Johannesburg,Johannesburg,South Africa

出　　处：《Integrative Zoology》2019年第5期506-526,共21页整合动物学（英文版）

基　　金：SANBI to conduct research on Heaviside’s dolphins(001/2011);the work was conducted under permits from the Department of Environmental Affairs(RES2009/06,RES2010/24,RES2011/70 and RES2012/67);Samples from Namibia were exported under permit from the Ministry of Envi­ronment and Tourism(78438,120586 and 138004)。

摘　　要：The Heaviside’s(or Benguela)dolphin(Cephalorhynchus heavisidii)is endemic to the west coast of southern Africa.The present study investigated the population genetic structure across a large portion of the species dis­tribution using mitochondrial control region and nuclear(microsatellite)markers.A total of 395 biopsy skin samples were analyzed;they were collected from free-ranging Heaviside’s dolphins in 7 locations along 1650 km of coast between Table Bay,South Africa and Walvis Bay,Namibia.Both genetic markers rejected the hy­pothesis of 1 homogenous population but revealed contrasting results in the genetic structuring of putative pop­ulations.Mitochondrial DNA suggested either 2 populations or a fine-scale division with 6(sub)populations,while microsatellite markers were indicative of 2 widespread populations with measurable gene flow between them.Neutrality tests and mismatch distribution of the mitochondrial sequences indicated a departure from mu­tation-drift equilibrium due to a population expansion at the 2 extremes of the geographic range,but not to­wards the middle of the distribution.These results highlight the importance of evaluating multiple genetic mark­ers to gain reliable insights into population processes and structure.

关 键 词：Heaviside’s(Benguela)dolphins microsatellite loci mitochondrial DNA population genetic structure southern Africa 

分 类 号：O57[理学—粒子物理与原子核物理]