Local persistence of Mann’s soft-haired mouse Abrothrix manni (Rodentia, Sigmodontinae) during Quaternary glaciations in southern Chile

Quaternary climatic oscillations have impacted Patagonian sigmodontine fauna, leaving traceable genetic footprints. In southern Chile, changes in the landscape included transitions to different vegetation formations as well as the extension of ice sheets. In this study, we focus on the Valdivian forest endemic and recently described sigmodontine species Abrothrix manni. We aim to assess the genetic structure of this species, testing for the existence of intraspecific lineages, and inferring the recent demographic history of the species. Analyses were based on the first 801 bp of the mitochondrial gene Cytocrhome-b from 49 individuals of A. manni collected at 10 localities that covers most part of its geographic distribution. Genealogical analyses recovered two main intraspecific lineages that are geographically segregated and present an intermediate site of secondary contact. Historical demography shows signal of recent population decrease. Based on these results, we proposed that curre...

第四纪（Quaternary）气候震荡对巴塔哥尼亚西啮齿类（sigmodontine）动物区系产生了深刻影响，并留下了可追溯的遗传印记。智利南部的景观变迁包含不同植被群落的演替与冰盖扩张。本研究以瓦尔迪维亚森林（Valdivian forest）特有、且近期被正式描述的西啮齿类物种曼氏尖鼠（Abrothrix manni）为对象，旨在解析该物种的遗传结构，验证种内谱系的存在性，并推断其近期种群历史动态。分析基于采自覆盖该物种绝大多数地理分布范围的10个采样点的49号曼氏尖鼠（A. manni）样本的线粒体细胞色素b基因（Cytocrhome-b）前801个碱基对（bp）序列。谱系地理学分析揭示了两个地理分隔的主要种内谱系，二者存在一处次级接触带。种群历史动态分析显示出近期种群数量下降的信号。基于上述结果，我们提出……（原文内容未完结）