Evidence of small-scale vicariance in Caridina lanceolata (Decapoda: Atyidae) from the Malili Lakes, Sulawesi
Evidence of small-scale vicariance in Caridina lanceolata (Decapoda: Atyidae) from the Malili Lakes, Sulawesi
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苏拉威西马里利湖中的Caridina lanceolata（十足目：Atyidae）小规模生存的证据
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
G. Haffner
中科院分区：
文献类型：
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作者：
D. Roy;D. Kelly;C. Fransen;D. Heath;G. Haffner
问题：扩散能力和地理隔离是否是调节种群分化和新物种形成的影响因素？假设：即使在很小的地理距离上，障碍也会导致巨大的种群分化，特别是当这种障碍阻止了扩散并最终阻止了密切相关的种群之间的基因流动时。生物体：Caridina lanceolata Woltereck，1937。现场：马塔诺湖（印度尼西亚苏拉威西岛）是马利利湖的水文源头，被Petea河与下游湖泊分开，Petea河的海拔变化为72米，其中一部分由高度流动的急流组成。方法：我们使用形态特征和遗传数据来评估在这个障碍之上和之下发生的种群之间的关系。结论：湖泊内种群之间缺乏形态和系统发育分化，表明湖泊系统内的基因流动没有障碍。然而，湖泊之间的系统发育差异增大，加上微妙的形态不连续性，表明佩蒂亚河流域存在强烈的分化。因此，C. lanceolata的限制Petea河，导致显着的种群结构之间的采样种群。跨河遗传分化的幅度加上总体一般形态相似性种群之间是一致的神秘的兄弟物种。
Question: Are dispersal ability and vicariance influential factors regulating population divergence and the formation of new species? Hypothesis: Barriers can lead to dramatic population divergence even over small geographic distances, especially when such barriers prevent dispersal and ultimately gene flow among closely related populations. Organism: Caridina lanceolata Woltereck, 1937. Field site: Lake Matano (Sulawesi, Indonesia) is the hydrological head of the Malili Lakes and is separated from downstream lakes by the Petea River, which negotiates a 72-m change in elevation, part of which consists of highly flowing rapids. Methods: We use morphological traits and genetic data to assess relationships among populations that occur above and below this barrier. Conclusions: The lack of morphological and phylogenetic differentiation among populations within lakes indicates no barriers to gene flow within lake systems. Elevated phylogentic differences between lakes, however, coupled with subtle morphological discontinuities indicates strong differentiation across the Petea River. Thus, dispersal and gene flow of C. lanceolata is restricted by the Petea River, leading to significant population structure among sampled populations. The magnitude of the cross-river genetic differentiation coupled with overall general morphological similarities among populations is consistent with cryptic sibling species.