Data from: Matrix correspondence tests on the DNA phylogeny of the Tenerife lacertid elucidate both historical causes and morphological adaptation

Previous studies using partial regression Mantel tests of matrix correspondence on within-island geographic variation in the color pattern of the Tenerife (Canary Islands) lacertid lizard (Gallotia galloti) support natural selection for different north--south climatically determined biotopes but do not support any historical cause. However, tests on the DNA phylogeny based primarily on population data from 57 localities on Tenerife support the hypothesis that there were populations on two putative precursor islands that have come into secondary contact and introgressed after these islands were joined to form Tenerife by the eruption of the Canadas edifice. Subsequent partial Mantel tests continue to support the hypothesis that color pattern is adapted to the climatic biotopes even when this phylogenetic information is taken into account by (1) testing for color pattern adaptation separately within each lineage and (2) testing for color pattern adaptation across the entire island while considering the molecular phylogenetic relationships as representing an alternative explanation. Selection has largely expunged any trace of the geological history from current morphological variation, and the introgression of these island populations after an estimated 0.7 million years of separation gives an insight into the relationships between allopatric divergence and reproductive isolation.

此前针对加那利群岛特内里费岛的加那利壁蜥（Gallotia galloti）体色图案的岛内地理变异开展的研究，采用矩阵对应性偏回归曼特尔检验（partial regression Mantel tests），结果支持自然选择作用于南北气候驱动的生境分化这一假说，但未发现任何历史成因的相关证据。然而，基于特内里费岛57个采样点的种群数据构建的DNA系统发育（DNA phylogeny）分析结果，则支持如下假说：在加那利巨火山（Canadas edifice）喷发致使两个推测的前体岛屿合并形成特内里费岛之前，这两个岛屿上曾各自存在种群，二者随后发生了二次接触并产生了基因渐渗（introgression）。后续的偏曼特尔检验进一步证实，即便纳入系统发育信息，体色图案仍会适应气候生境：其一，在每个支系（lineage）内部单独检验体色图案的适应性演化；其二，将分子系统发育关系作为备选解释，对全岛范围内的体色图案适应性进行检验。自然选择基本抹去了地质历史在当前形态变异中的痕迹；而两个种群经历约70万年的分化后发生的基因渐渗，也为解析异域分化（allopatric divergence）与生殖隔离（reproductive isolation）之间的关联提供了新的视角。