Molecular phylogeny analysis of fiddler crabs: test of the hypothesis of increasing behavioral complexity in evolution.
Molecular phylogeny analysis of fiddler crabs: test of the hypothesis of increasing behavioral complexity in evolution.
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DOI：
10.1073/pnas.93.20.10855
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发表时间：
1996-10
影响因子：
11.1
通讯作者：
C. Sturmbauer;J. Levinton;John H. Christy
中科院分区：
文献类型：
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作者：
C. Sturmbauer;J. Levinton;John H. Christy
目前关于梭子蟹进化和生物地理学的系统发育假说依赖于一个假设，即复杂的行为特征也被认为是进化派生的。印度-西太平洋的招潮蟹具有更简单的繁殖社会行为，更多的是海洋性的，被认为是行为更复杂、更陆生的美洲物种的祖先。它还假设，更复杂的社会和生殖行为的演变与较高潮间带的殖民有关。然而，我们基于一组独立的分子特征进行的系统发育分析表明，关于进化和生物地理学的广泛根深蒂固的观点导致了关于这一泛热带甲壳类群体内的进化趋势的合理但明显不正确的结论。带有这组“派生特征”的物种在系统进化上是祖先，这暗示了另一种进化场景：招潮蟹的繁殖行为复杂性的进化可能在它们的进化过程中出现了多次。行为复杂性的进化可能是通过增加一系列其他适应潮间带生活和反捕食者逃生的适应而产生的。对巴拿马地峡两侧种群的分子进化速度的校准表明，16S rRNA的序列分歧率为每百万年0.9%。祖先支系和衍生形式之间的分歧估计约为2200万年前，而美洲和印度-西太平洋之间的分歧估计约为1700万年前。
The current phylogenetic hypothesis for the evolution and biogeography of fiddler crabs relies on the assumption that complex behavioral traits are assumed to also be evolutionary derived. Indo-west Pacific fiddler crabs have simpler reproductive social behavior and are more marine and were thought to be ancestral to the more behaviorally complex and more terrestrial American species. It was also hypothesized that the evolution of more complex social and reproductive behavior was associated with the colonization of the higher intertidal zones. Our phylogenetic analysis, based upon a set of independent molecular characters, however, demonstrates how widely entrenched ideas about evolution and biogeography led to a reasonable, but apparently incorrect, conclusion about the evolutionary trends within this pantropical group of crustaceans. Species bearing the set of "derived traits" are phylogenetically ancestral, suggesting an alternative evolutionary scenario: the evolution of reproductive behavioral complexity in fiddler crabs may have arisen multiple times during their evolution. The evolution of behavioral complexity may have arisen by coopting of a series of other adaptations for high intertidal living and antipredator escape. A calibration of rates of molecular evolution from populations on either side of the Isthmus of Panama suggest a sequence divergence rate for 16S rRNA of 0.9% per million years. The divergence between the ancestral clade and derived forms is estimated to be approximately 22 million years ago, whereas the divergence between the American and Indo-west Pacific is estimated to be approximately 17 million years ago.