Distributions of mammals in Southeast Asia: the role of the legacy of climate and species body mass

Aim: Current species distributions are shaped by present and past biotic and abiotic factors. Here we assessed whether abiotic factors (habitat availability) in combination with past connectivity and a biotic factor (body mass) can explain the unique distribution pattern of Southeast Asian mammals, which are separated by the enigmatic biogeographic transition zone, the Isthmus of Kra (IoK), for which no strong geophysical barrier exists. Location: Southeast Asia Taxon: Mammals Methods: We projected habitat suitability for 125 mammal species using climate data for the present period and for two historic periods: mid-Holocene (6 kya) and last glacial maximum (LGM 21 kya). Next, we employed a phylogenetic linear model to assess how present species distributions were affected by the suitability of areas in these different periods, habitat connectivity during LGM and species body mass. Results: Our results show that cooler climate during LGM provided suitable habitat south of IoK for species...研究目的：当前物种的分布格局由现存与历史时期的生物、非生物因子共同塑造。本研究旨在探讨非生物因子（生境可利用性）结合历史连通性与生物因子（体质量），能否解释东南亚哺乳动物的独特分布模式——该类群被神秘的生物地理过渡带克拉地峡（Isthmus of Kra, 缩写IoK）分隔，而该区域并无强烈的地球物理屏障。 研究区域：东南亚 研究类群：哺乳动物 研究方法：本研究利用当前时期以及两个历史时期（全新世中期，距今6 kya；末次盛冰期（Last Glacial Maximum, 缩写LGM），距今21 kya）的气候数据，对125种哺乳动物的生境适宜性进行预测。随后，采用系统发育线性模型，分析不同时期区域生境适宜性、末次盛冰期生境连通性以及物种体质量对当前物种分布格局的影响。 研究结果：本研究结果显示，末次盛冰期的较冷气候为克拉地峡以南的物种提供了适宜生境……