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.

本研究针对马提尼克安乐蜥（Martinique anole）的8条样带开展系统性分析，全面探究其广泛的数量性状变异（quantitative trait variation），具体涵盖喉扇色调（dewlap hue）、体色图案（colour pattern）、背部色调（dorsum hue）、躯体比例以及鳞被特征（scalation）；这8条样带分别对应三类演化场景：初期邻域生态物种形成（nascent parapatric ecological speciation）、初期异域物种形成（nascent allopatric speciation），以及未形成足以支撑物种形成的有效遗传结构的异域分化（allopatric divergence）。相邻种群组间的数量性状分化（quantitative trait divergence）程度可达到极高水平，但仅存一例例外：此类分化与栖息地差异直接相关，而非与既往的异域分化历程存在关联。在所有性状类别（包括与自然选择（natural selection）、性选择（sexual selection）相关的性状）中，初期邻域生态物种形成场景下的数量性状分化程度最高。唯一一例初期异域物种形成场景，在多数性状类别中均呈现出较为显著的数量性状分化，但与自然选择（而非性选择）关联最紧密的性状类别则未出现此类分化。本研究还探讨了性选择在生态物种形成中的作用，分别从选型交配（assortative mating）框架下的雌性配偶选择，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。