Phylogeography of the dark fruit-eating bat Artibeus obscurus in the Brazilian Amazon

Artibeus obscurus (Mammalia: Chiroptera) is endemic to South America, being found in at least 18 Brazilian states. Recent studies revealed that different populations of this genus present distinct phylogeographic patterns; however, very little is known on the population genetics structure of A. obscurus in the Amazon rainforest. Here, using a fragment (1010bp) of the mitochondrial gene cytochrome b from 87 samples, we investigated patterns of genetic divergence among populations of A. obscurus from different locations in the Brazilian Amazon rainforest and compared them with other Brazilian and South American regions. Analysis of molecular variance (AMOVA), fixation index (Fst) analysis, and phylogeographic patterns showed divergence between two major monophyletic groups, each one corresponding to a geographic region associated with the Atlantic and Amazon forest biomes. The Atlantic forest clusters formed a monophyletic group with a high bootstrap support and a fragmented distribution ...

暗褐矛吻蝠（Artibeus obscurus，哺乳纲：翼手目）为南美洲特有物种，目前至少在18个巴西州份有分布记录。已有研究表明，该属的不同种群展现出各异的系统地理学格局，但学界对亚马逊雨林中暗褐矛吻蝠的种群遗传结构仍所知有限。本研究以87份样本的线粒体细胞色素b（cytochrome b）基因的1010bp片段为分子标记，对巴西亚马逊雨林不同采样点的暗褐矛吻蝠种群的遗传分化格局展开分析，并将其与巴西其他区域及南美洲其他区域的种群进行对比。分子方差分析（Analysis of molecular variance, AMOVA）、固定指数（fixation index, Fst）分析及系统地理学格局研究结果显示，存在两个主要的单系群分支，二者分别对应与大西洋森林生物群系和亚马逊森林生物群系相关联的地理区域。大西洋森林类群形成了一个具有高自举支持度的单系群，且呈现片段化分布……