Ecological specialization correlates with genotypic differentiation in sympatric host-populations of the pea aphid

被引：64

作者：

Frantz, A ^{[1
]}

Plantegenest, M ^{[1
]}

Mieuzet, L ^{[1
]}

Simon, JC ^{[1
]}

机构：

[1] INRA, UMR, F-35653 Le Rheu, France

来源：

JOURNAL OF EVOLUTIONARY BIOLOGY | 2006年 / 19卷 / 02期

关键词：

Bayesian assignment; host races; microsatellite; population genetics; reproductive mode; sympatric speciation;

D O I：

10.1111/j.1420-9101.2005.01025.x

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

The pea aphid, Acyrthosiphon pisum, encompasses distinct host races specialized on various Fabaceae species, but the extent of genetic divergence associated with ecological specialization varies greatly depending on plant and geographic origins of aphid populations. Here, we studied the genetic structure of French sympatric pea aphid populations collected on perennial (pea and faba bean) and annual (alfalfa and red clover) hosts using 14 microsatellite loci. Classical and Bayesian population genetics analyses consistently identified genetic clusters mostly related to plant origin: the pea/faba bean cluster was highly divergent from the red clover and the alfalfa ones, indicating they represent different stages along the continuum of genetic differentiation. Some genotypes were assigned to a cluster differing from the one expected from their plant origin while others exhibited intermediate genetic characteristics. These results suggest incomplete barriers to gene flow. However, this limited gene flow seems insufficient to prevent ecological specialization and genetic differentiation in sympatry.

引用

页码：392 / 401

页数：10

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