Phylogenetics and evolution of a circumarctic species complex (Cladocera: Daphnia pulex)

被引:67
作者
Colbourne, JK [1 ]
Crease, TJ
Weider, LJ
Hebert, PDN
Dufresne, F
Hobaek, A
机构
[1] Univ Guelph, Dept Zool, Guelph, ON N1G 2W1, Canada
[2] Max Planck Inst Limnol, D-24302 Plon, Germany
[3] Univ Quebec, Dept Biol, Rimouski, PQ G5L 3A1, Canada
[4] Norwegian Inst Water Res, N-5005 Bergen, Norway
基金
加拿大自然科学与工程研究理事会;
关键词
Arctic; speciation; cladistics; phenetics; molecular systematics; hybridization; Pleistocene glaciation; ND5; sequence; mitochondrial DNA;
D O I
10.1006/bijl.1998.0251
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The evolutionary history of freshwater zooplankton is still relatively unknown. However, studies of the microcrustacean Daphnia have revealed interesting patterns; the daphniids that dominate ponds and lakes in the northern hemisphere may have recent origins, likely associated with the glacial advances and retreats during the Pleistocene. Moreover, they form species complexes that actively engage in hybridization and introgression. The present study examines the phylogenetic relationships among circumarctic members of the Daphnia pulex complex, through the analysis of sequence diversity in 498 nt of the ND5 mitochondrial gene. Our results suggest that the complex is composed of three major clades, two of which are subdivided into at least eight different lineages. Clearly, species in the complex shown genetic discontinuity. Many lineages originated during the Pleistocene, but at least three lineages diverged during the Pliocene. Two taxa (D. pulex, D. pulicaria), thought to be broadly distributed in the northern hemisphere, are shown to be endemic to single continents. In general, the diversification of the pulex complex is characterized by rapidly dispersed lineages spanning enormous distances and also by endemism in temperate areas. Gene flow among lineages from the temperate region of different continents are restricted to rare intercontinental migrations across a polar bridge followed by convergent morphological evolution. (C) 1998 The Linnean Society of London.
引用
收藏
页码:347 / 365
页数:19
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