Disruptive selection of shell colour in land snails: a mark-recapture study of Euhadra peliomphala simodae
Disruptive selection of shell colour in land snails: a mark-recapture study of Euhadra peliomphala simodae
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陆地蜗牛壳颜色的破坏性选择：Euhadra peliomphala simodae 的标记重捕获研究
DOI：
10.1093/biolinnean/blz168
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发表时间：
2019
影响因子：
1.9
通讯作者：
Konuma Junji
中科院分区：
文献类型：
--
作者：
Ito Shun;Konuma Junji
许多理论研究表明，破坏性选择在表型分化中起着重要作用，但很少有研究通过实地研究确定破坏性选择对表型分化的作用。本研究研究了破坏性选择对日本陆地蜗牛壳颜色多态性的影响，以确定极端表型的蜗牛壳颜色是否优于中间表型。我们在一个海洋岛屿上用黑色、黄色和中间颜色的de进行了实地调查。p . simodaesnails。我们捕获并标记了约1800只蜗牛，并在18个月的时间里监测了它们的生存情况。我们根据图像量化了贝壳颜色，并检查了贝壳颜色变化的频率分布。变异呈双峰分布，中色蜗牛的频率远低于黑色或黄色蜗牛。三种蜗牛种群数量随季节变化而同步波动。贝叶斯估计表明，与黑色和黄色蜗牛相比，中间颜色蜗牛的存活率较低，这意味着存在与壳颜色相关的破坏性选择。我们认为，这种破坏性的选择可能导致蜗牛壳颜色在具有高壳颜色变异的谱系中出现进化分歧。
Many theoretical studies have suggested that disruptive selection plays an important role in phenotypic divergence, but few studies have determined the action of disruptive selection on phenotypic divergence via field studies. This study investigated the effect of disruptive selection on shell colour polymorphism in the Japanese land snailEuhadra peliomphala simodaeto determine whether extreme phenotypes of snail shell colour are favoured over intermediate phenotypes. We conducted field surveys on an oceanic island with black, yellow and intermediate-colouredE. p. simodaesnails. We captured and marked ~1800 individual snails and monitored their survival over 18 months. We quantified shell colours against images and examined the frequency distribution of shell colour variation. The variation exhibited a bimodal distribution with a far lower frequency of intermediate-coloured snails than of black or yellow snails. The population sizes of the three snail groups fluctuated synchronously with the changing seasons. Bayesian estimates showed lower survival rates for juvenile intermediate-coloured snails than for juvenile black and yellow snails, implying there was disruptive selection associated with shell colour. We suggest this disruptive selection may have resulted in the evolutionary divergence of the snail’s shell colour within the lineage having high shell colour variation.