Non-adaptive speciation of snails by left-right reversal is facilitated on oceanic islands

Masaki Hoso*

*この研究の対応する著者

研究成果: Article査読

7 被引用数 (Scopus)

抄録

The nearly neutral theory of molecular evolution predicts that small population size is essential for non-adaptive evolution. Evolution of whole-body left-right reversal in snails is generally a compelling example of non-adaptive speciation, because variants with reversed chirality would suffer from reduced mating opportunities within a population. Despite this reproductive disadvantage, sinistral snail species have repeatedly originated from dextral ancestors in terrestrial pulmonates. Here I show that snail speciation by reversal has been accelerated on oceanic islands. Analysing the global biogeography of 995 genera across 84 stylommatophoran families, I found that the proportion of sinistral snail genera was enhanced in genera endemic to oceanic islands. Oceanic islands are relatively small land masses offering highly fragmented habitats for snails. Thus, the upper limit of population size would probably have been small for a long time there. Oceanic islands may have facilitated the fixation of the nonadaptive allele for speciation by reversal, allowing subsequent ecological divergence of sibling species. This study illustrates the potential role of genetic drift in non-adaptive speciation on oceanic islands.

本文言語English
ページ(範囲)79-85
ページ数7
ジャーナルContributions to Zoology
81
2
DOI
出版ステータスPublished - 2012
外部発表はい

ASJC Scopus subject areas

  • 生態、進化、行動および分類学
  • 動物科学および動物学

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