作者
Kerstin Johannesson, Marina Panova, Petri Kemppainen, Carl André, Emilio Rolan-Alvarez, Roger K Butlin
发表日期
2010/6/12
来源
Philosophical Transactions of the Royal Society B: Biological Sciences
卷号
365
期号
1547
页码范围
1735-1747
出版商
The Royal Society
简介
Distinct ecotypes of the snail Littorina saxatilis, each linked to a specific shore microhabitat, form a mosaic-like pattern with narrow hybrid zones in between, over which gene flow is 10–30% of within-ecotype gene flow. Multi-locus comparisons cluster populations by geographic affinity independent of ecotype, while loci under selection group populations by ecotype. The repeated occurrence of partially reproductively isolated ecotypes and the conflicting patterns in neutral and selected genes can either be explained by separation in allopatry followed by secondary overlap and extensive introgression that homogenizes neutral differences evolved under allopatry, or by repeated evolution in parapatry, or in sympatry, with the same ecotypes appearing in each local site. Data from Spain, the UK and Sweden give stronger support for a non-allopatric model of ecotype formation than for an allopatric model. Several …
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