Glacial cycles as an allopatric speciation pump in north-eastern American freshwater fishes

被引:111
作者
April, Julien [1 ]
Hanner, Robert H. [2 ]
Dion-Cote, Anne-Marie [1 ]
Bernatchez, Louis [1 ]
机构
[1] Univ Laval, Dept Biol, IBIS, Quebec City, PQ G1V 0A6, Canada
[2] Univ Guelph, Biodivers Inst Ontario, Guelph, ON N1G 2W1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
amplified fragment length polymorphism; comparative phylogeography; DNA barcode; hybrid; mtDNA; suture zone; LAURENTIAN GREAT-LAKES; MITOCHONDRIAL-DNA; COMPARATIVE PHYLOGEOGRAPHY; HYBRID ZONES; MORPHOLOGICAL-DIFFERENTIATION; POSTGLACIAL DISPERSAL; POPULATION-GENETICS; ETHEOSTOMA-NIGRUM; SUTURE ZONE; AFLP;
D O I
10.1111/mec.12116
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Allopatric speciation may be the principal mechanism generating new species. Yet, it remains difficult to judge the generality of this process because few studies have provided evidence that geographic isolation has triggered the development of reproductive isolation over multiple species of a regional fauna. Here, we first combine results from new empirical data sets (7 taxa) and published literature (9 taxa) to show that the eastern Great Lakes drainage represents a multispecies suture zone for glacial lineages of freshwater fishes with variable levels of genetic divergence. Second, we performed amplified fragment length polymorphism analyses among four pairs of lineages. Results indicate that lineages with relatively deep levels of mtDNA 5' COI (barcode) sequence divergence (>2%) developed strong reproductive barriers, while lineages with lower levels of divergence show weaker reproductive isolation when found in sympatry. This suggests that a threshold of 2% sequence divergence at mtDNA could be used as a first step to flag cryptic species in North American freshwater fishes. By describing different levels of divergence and reproductive isolation in different co-occurring fishes, we offer strong evidence that allopatric speciation has contributed significantly to the diversification of north-eastern American freshwater fishes and confirm that Pleistocene glacial cycles can be viewed as a speciation pump that played a predominant role in generating biodiversity.
引用
收藏
页码:409 / 422
页数:14
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