Recent lake expansion triggered the adaptive radiation of freshwater snails in the ancient Lake Biwa
Recent lake expansion triggered the adaptive radiation of freshwater snails in the ancient Lake Biwa
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DOI：
10.1002/evl3.92
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发表时间：
2019-02-01
影响因子：
5
通讯作者：
Chiba, Satoshi
中科院分区：
文献类型：
--
作者：
Miura, Osamu;Urabe, Misako;Chiba, Satoshi
湖泊扩张导致新栖息地的形成，有可能推动湖内多样化。日本中部的古代琵琶湖在历史上经历了湖泊尺寸的巨大变化，它为评估湖泊尺寸波动在特有动物群多样化中的作用提供了一个有用的系统。在这里，我们利用全基因组 DNA 分析，重建了琵琶湖地质历史中属于琵琶亚属的特有淡水蜗牛的多样化历史。我们发现两个基因不同的蜗牛谱系独立地定居在琵琶湖上，并且它们同时并迅速辐射到现存的 15 种琵琶螺物种中。古生物学证据和分子测年技术相结合表明，Biwamelania 的辐射与大约 40 万年前湖泊的最新扩张密切相关，并表明与湖泊扩张相关的生态机会的增加推动了快速适应性辐射。我们认为琵琶湖中的琵琶螺为了解琵琶湖地质历史与湖内快速多样化之间的关系提供了一个有前途的新系统。
Lake expansion that leads to the formation of new habitats has potential to drive intralacustrine diversification. The ancient Lake Biwa in central Japan has historically experienced substantial changes in the lake size, and it provides a useful system for evaluating the role of lake-size fluctuations in the diversification of endemic fauna. Here, we used genome-wide DNA analyses and reconstructed the diversification history of the endemic freshwater snails belonging to the subgenus Biwamelania with respect to the geological history of Lake Biwa. We found that two genetically distinct snail lineages independently colonized Lake Biwa and they concurrently and rapidly radiated into 15 extant Biwamelania species. A combination of paleontological evidence and molecular dating technique demonstrated that the radiation of Biwamelania was tightly linked to the latest enlargement of the lake about 0.4 million years ago and suggested that increased ecological opportunity associated with the lake expansion drove the rapid adaptive radiation. We propose that the Biwamelania snails in Lake Biwa offer a promising new system for understanding the association between the geological history of the lake and rapid intralacustrine diversification.