Lack of mitochondrial genetic structure in the endangered giant clam populations of Tridacna maxima(Bivalvia: Cardiidae:Tridacninae) across the Saudi Arabian coast  

作　　者：Abdelwaheb Ben Othmen Mohamed Abhary Temim Deli Zouhour Ouanes Noura Alhuwaiti Najet Dimassi Lamjed Mansour 

机构地区：[1]Laboratory of Genetics,Biodiversity and Enhancement of Bioresources(LR11ES41),Higher Institute of Biotechnology of Monastir,University of Monastir,Monastir 5000,Tunisia [2]Department of Biology,Taibah University,Al-Madinah 30002,Saudi Arabia [3]Department of Zoology,College of Science,King Saud University,Riyadh 11451,Saudi Arabia

出　　处：《Acta Oceanologica Sinica》2020年第2期28-37,共10页海洋学报（英文版）

摘　　要：The present investigation focuses on population genetic structure analysis of the endangered giant clam species Tridacna maxima across part of the Red Sea,with the main aim of assessing the influence of postulated potential barriers to gene flow(i.e.,particular oceanographic features and marked environmental heterogeneity)on genetic connectivity among populations of this poorly dispersive bivalve species.For this purpose,a total of 44 specimens of T.maxima were collected from five sampling locations along the Saudi Arabian coast and examined for genetic variability at the considerably variable mitochondrial gene cytochrome c oxidase I(COI).Our results revealed lack of population subdivision and phylogeographic structure across the surveyed geographic spectrum,suggesting that neither the short pelagic larval dispersal nor the various postulated barriers to gene flow in the Red Sea can trigger the onset of marked genetic differentiation in T.maxima.Furthermore,the discerned shallow COI haplotype genealogy(exhibiting high haplotype diversity and low nucleotide diversity),associated with recent demographic and spatial expansion events,can be considered as residual effect of a recent evolutionary history of the species in the Red Sea.The present investigation focuses on population genetic structure analysis of the endangered giant clam species Tridacna maxima across part of the Red Sea, with the main aim of assessing the influence of postulated potential barriers to gene flow(i.e., particular oceanographic features and marked environmental heterogeneity) on genetic connectivity among populations of this poorly dispersive bivalve species. For this purpose, a total of 44 specimens of T. maxima were collected from five sampling locations along the Saudi Arabian coast and examined for genetic variability at the considerably variable mitochondrial gene cytochrome c oxidase I(COI). Our results revealed lack of population subdivision and phylogeographic structure across the surveyed geographic spectrum, suggesting that neither the short pelagic larval dispersal nor the various postulated barriers to gene flow in the Red Sea can trigger the onset of marked genetic differentiation in T. maxima. Furthermore, the discerned shallow COI haplotype genealogy(exhibiting high haplotype diversity and low nucleotide diversity), associated with recent demographic and spatial expansion events, can be considered as residual effect of a recent evolutionary history of the species in the Red Sea.

关 键 词：Molluscs RED Sea GENETIC variability MITOCHONDRIAL DNA GENETIC homogeneity demographic expansion 

分 类 号：Q953[生物学—动物学]