Ancient DNA reveals Holocene loss of genetic diversity in a South American rodent
Ancient DNA reveals Holocene loss of genetic diversity in a South American rodent
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DOI：
10.1098/rsbl.2005.0354
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发表时间：
2005-12-22
期刊：
影响因子：
3.3
通讯作者：
Hadly, EA
中科院分区：
文献类型：
--
作者：
Chan, YL;Lacey, EA;Hadly, EA
了解动物种群如何在古环境条件下进化，对于预测未来环境变化对当前生物多样性的影响至关重要。对古代DNA的分析为追踪人类对史前环境的反应提供了一个独特的机会。我们探讨了古环境变化的影响殖民tuco-tuco（Ctenomys sociabilis），巴塔哥尼亚啮齿动物，目前被列为世界自然保护联盟的威胁高度特有的物种。通过结合调查的现代遗传变异，从整个物种的当前地理范围与DNA样本的分析，从化石材料可以追溯到10000 ybp，我们证明了一个显着下降的遗传多样性，是一致的环境事件在研究区域。我们的研究结果强调了非人为因素在多样性丧失中的重要性，包括啮齿动物等小型哺乳动物的减少。
Understanding how animal populations have evolved in response to palaeoenvironmental conditions is essential for predicting the impact of future environmental change on current biodiversity. Analyses of ancient DNA provide a unique opportunity to track population responses to prehistoric environments. We explored the effects of palaeoenvironmental change on the colonial tuco-tuco (Ctenomys sociabilis), a highly endemic species of Patagonian rodent that is currently listed as threatened by the IUCN. By combining surveys of modern genetic variation from throughout this species' current geographic range with analyses of DNA samples from fossil material dating back to 10000 ybp, we demonstrate a striking decline in genetic diversity that is concordant with environmental events in the study region. Our results highlight the importance of non-anthropogenic factors in loss of diversity, including reductions in smaller mammals such as rodents.