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.

过往针对特内里费岛（加那利群岛）正蜥科蜥蜴（lacertid lizard，Gallotia galloti）色斑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 test），结果支持自然选择作用于南北气候差异驱动的生境类型这一假说，但未发现任何历史成因的相关证据。不过，基于特内里费岛57个采样点的种群数据构建的DNA系统发育分析结果，则支持另一假说：特内里费岛由两座假想的前体岛屿经加那大火山构造（Canadas edifice）喷发合并而成，此前两座岛上的种群曾发生二次接触并产生基因渐渗（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，色斑仍会适应气候生境：一是在每个演化支系内单独检验色斑适应性，二是将分子系统发育关系作为备选解释，在全岛范围内检验色斑适应性。自然选择已基本抹去了当前形态变异中留存的地质历史痕迹；而两座种群历经约70万年分化后的基因渐渗，也为理解异域分化（allopatric divergence）与生殖隔离（reproductive isolation）间的关联提供了新视角。