Molecular phylogenetics of circumglobal Euphausia species (Euphausiacea: Crustacea)

被引:28
作者
Jarman, SN
Elliott, NG
Nicol, S
McMinn, A
机构
[1] Univ Tasmania, Inst Antarctic & So Ocean Studies, Hobart, Tas 7001, Australia
[2] CSIRO Marine Res, Hobart, Tas 7001, Australia
[3] Australian Antarctic Div, Kingston, Tas 7050, Australia
关键词
D O I
10.1139/cjfas-57-S3-51
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
The speciation history of members of the krill genus Euphausia with continuous circumglobal distributions was investigated by phylogenetic and molecular clock analyses of their mitochondrial DNA. Molecular clock estimates for divergence times of Antarctic and sub-Antarctic species of Euphausia of similar to 15 million years ago were fairly close to the time of formation of the Antarctic Convergence, consistent with their vicariant speciation. However, the confidence limits quantified for these time estimates were large at similar to 11 million and similar to 25 million years. A divergence time of between similar to 10 million years for Euphausia triacantha and Euphausia longirostris suggested that migration across oceanographic fronts like the Antarctic Convergence may also lead to speciation in krill. Genetic differentiation between Euphausia vallentini and Euphausia lucens was found to be relatively minor and occurred between 0.76 million and 1.65 million years ago. These species have overlapping ranges, suggesting that there is potential for sympatric genetic differentiation in krill.
引用
收藏
页码:51 / 58
页数:8
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