Comparative phylogeography of mainland and insular species of Neotropical molossid bats (Molossus)

Genetic structures, historical events, habitat preferences, and geographic barriers might result in distinct patterns in insular versus mainland populations. Comparison between these two biogeographic systems provides an opportunity to investigate the relative role of isolation in phylogeographic patterns and to elucidate the importance of evolution and demographic history in population structure. Herein we use a genotype by sequencing approach (GBS) to explore population structure within three species of mastiff bats (Molossus molossus, M. coibensis, and M. milleri), which represent different ecological histories and geographical distributions in the genus to explore phylogeographic patterns and better understand the role of geographic barriers in their dispersal and gene flow. We tested the hypotheses that oceanic straits serve as barriers to dispersal in Caribbean bats and that isolated island populations are more likely to experience genetic drift and bottlenecks relative to highly ...

遗传结构、历史事件、生境偏好以及地理屏障，可能会致使岛屿种群与大陆种群呈现出截然不同的格局。对这两类生物地理系统开展比较研究，可为探究隔离在系统地理学（phylogeography）格局中的相对作用，以及阐明演化与种群动态历史对种群结构的重要意义提供宝贵契机。本研究采用测序分型（Genotype by Sequencing, GBS）技术，对犬吻蝠属（Molossus）内的三个物种——普通犬吻蝠（Molossus molossus）、科伊班犬吻蝠（M. coibensis）以及米勒犬吻蝠（M. milleri）——的种群结构进行探究。上述三个物种在该属内具备迥异的生态历史与地理分布格局，本研究旨在揭示其系统地理学格局，并进一步明晰地理屏障在其扩散与基因流中的作用。本研究验证了两项假说：其一，海洋海峡可作为加勒比海蝙蝠扩散的屏障；其二，相较于高度（原文未完整表述），孤立的岛屿种群更易发生遗传漂变与种群瓶颈效应。