Data from: Quantitative traits and mode of speciation in Martinique anoles

We investigate extensive quantitative trait variation (dewlap hue, colour pattern, dorsum hue, body proportions and scalation) in the Martinique anole across eight transects representing nascent parapatric ecological speciation, nascent allopatric speciation, and allopatric divergence without sufficient genetic structure to suggest speciation. Quantitative trait divergence can be extremely large between adjacent sets of populations, but with one exception this is associated with difference in habitat rather than past allopatry. Nascent ecological speciation shows the greatest level of quantitative trait divergence across all character sets including those implicated in natural, as well as sexual selection. The sole example of nascent allopatric speciation is associated with fairly strong quantitative trait diverge among most character sets, but not the set most implicated in natural (rather than sexual) selection. The role of sexual selection in ecological speciation is discussed, both in terms of female choice with assortative mating, and male-male competition with condition-dependant sexual signals.

我们针对马提尼克安乐蜥（Martinique anole）开展研究，系统分析了其涵盖的多类数量性状变异（quantitative trait variation）——包括颈垂色调（dewlap hue）、体色图案、背部色调、身体比例及鳞片特征——共设置8条样带（transects），分别覆盖三类演化场景：新生邻域生态物种形成（nascent parapatric ecological speciation）、新生异域物种形成（nascent allopatric speciation），以及未具备足以构成物种形成的遗传结构的异域分化（allopatric divergence）。相邻种群间的数量性状分化（quantitative trait divergence）程度可极高；仅存在一个例外，该分化与栖息环境差异相关，而非过往的异域隔离历史。新生邻域生态物种形成场景下，所有性状组的数量性状分化程度均为最高，其中既包含与自然选择（natural selection）相关的性状，也包含与性选择（sexual selection）相关的性状。本次研究仅有的一例新生异域物种形成场景，其多数性状组均呈现出较强的数量性状分化，但与自然选择（而非性选择）关联最紧密的性状组则未出现此类分化。本研究还探讨了性选择在生态物种形成中的作用，分别从基于选型交配（assortative mating）的雌性配偶选择，以及依赖个体状态的性信号（condition-dependant sexual signals）介导的雄性间竞争两个维度展开论述。