Stochastic faunal exchanges drive diversification in widespread Wallacean and Pacific island lizards (Squamata: Scincidae: Lamprolepis smaragdina)

Aim: Widespread species found in disturbed habitats are often expected to be human commensals. In island systems, this association predicts that dispersal will be mediated by humans. We investigated the biogeographical relationships among populations of a widespread tree skink that inhabits coastal forest and human-cultivated plantations in Southeast Asia. We sought to determine whether populations of the emerald tree skink, Lamprolepis smaragdina, dis- persed via mechanisms that were not human-mediated (‘natural’ dispersal) or whether dispersal was mediated by humans. The latter scenario predicts low levels of genetic differentiation across a species’ range, coupled with a genetic signature of recent range expansion. Location: Southeast Asia, the Philippines, Wallacea and the south-western Pacific. Methods: We analysed sequences of mitochondrial DNA from 204 samples collected throughout the range of this species. We use phylogenetic and popu- lation genetic methods to distinguish betwe...

研究目的：栖息于受干扰生境的广布物种通常被认为是人伴生物种。在岛屿生态系统中，这一关联预示着物种扩散会由人类介导。本研究针对东南亚地区栖息于沿海森林与人工种植林的广布树石龙子种群，探究其不同种群间的生物地理学关系。我们旨在明确翡翠树石龙子（Lamprolepis smaragdina）的种群扩散究竟通过非人类介导的机制（即“自然”扩散），还是由人类活动介导。若为后者，则预测该物种整个分布范围内的遗传分化水平较低，且伴随近期分布范围扩张的遗传信号。
研究区域：东南亚、菲律宾、华莱士区及西南太平洋。
研究方法：我们对覆盖该物种整个分布范围的204份样本的线粒体DNA（mitochondrial DNA）序列进行了分析，并采用系统发育学与种群遗传学方法以区分……