DO GEOLOGICAL OR CLIMATIC PROCESSES DRIVE SPECIATION IN DYNAMIC ARCHIPELAGOS? THE TEMPO AND MODE OF DIVERSIFICATION IN SOUTHEAST ASIAN SHREWS
DO GEOLOGICAL OR CLIMATIC PROCESSES DRIVE SPECIATION IN DYNAMIC ARCHIPELAGOS? THE TEMPO AND MODE OF DIVERSIFICATION IN SOUTHEAST ASIAN SHREWS
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DOI：
10.1111/j.1558-5646.2009.00743.x
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发表时间：
2009-10-01
期刊：
影响因子：
3.3
通讯作者：
Brown, Rafe M.
中科院分区：
文献类型：
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作者：
Esselstyn, Jacob A.;Timm, Robert M.;Brown, Rafe M.
地质和气候过程可能通过产生和改变扩散障碍来改变物种形成率。在东南亚，有两个过程大大改变了土地的分布。中新世-上新世期间，火山隆升产生了许多新的岛屿，更新世期间海平面的反复波动导致岛屿之间断断续续的陆地连接。每一个过程都是多样化的潜在驱动力。我们使用一组东南亚鼩（Crocidura）的系统发育分析，研究地理和时间的多样化过程。总的来说，在新的地区殖民化之后，异地定居出现了多样化。苏拉威西岛提供了一个例外，在那里我们不能拒绝八个同域和同域物种的进化枝内的物种形成。我们发现只有微弱的支持暂时下降的多样化率，这意味着无论是火山隆起，也没有海平面波动多样化率有很强的影响。我们认为，动态的群岛不断提供新的机会，异地多样化，从而维持高物种形成率在很长一段时间内，或东南亚鼩 鼱代表一个不成熟的辐射密度依赖的轨迹，尚未填补地理和生态空间。
Geological and climatic processes potentially alter speciation rates by generating and modifying barriers to dispersal. In Southeast Asia, two processes have substantially altered the distribution of land. Volcanic uplift produced many new islands during the Miocene-Pliocene and repeated sea level fluctuations during the Pleistocene resulted in intermittent land connections among islands. Each process represents a potential driver of diversification. We use a phylogenetic analysis of a group of Southeast Asian shrews (Crocidura) to examine geographic and temporal processes of diversification. In general, diversification has taken place in allopatry following the colonization of new areas. Sulawesi provides an exception, where we cannot reject within-island speciation for a clade of eight sympatric and syntopic species. We find only weak support for temporally declining diversification rates, implying that neither volcanic uplift nor sea level fluctuations had a strong effect on diversification rates. We suggest that dynamic archipelagos continually offer new opportunities for allopatric diversification, thereby sustaining high speciation rates over long periods of time, or Southeast Asian shrews represent an immature radiation on a density-dependent trajectory that has yet to fill geographic and ecological space.