Comparative analysis of morphological diversity: Does disparity accumulate at the same rate in two lineages of centrarchid fishes?
Comparative analysis of morphological diversity: Does disparity accumulate at the same rate in two lineages of centrarchid fishes?
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DOI：
10.1111/j.0014-3820.2005.tb01826.x
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发表时间：
2005-08-01
期刊：
影响因子：
3.3
通讯作者：
Wainwright, PC
中科院分区：
文献类型：
--
作者：
Collar, DC;Near, TJ;Wainwright, PC
进化谱系的不同在于它们表现出的形式的多样性。我们调查了形态多样性的比较是否可以用来确定两个中心类目鱼类姐妹支系的生态多样性的差异。太阳鱼(Lepomis)支系中的物种捕食的猎物种类比小翼鱼支系(黑鲈鱼)中的物种更广泛。我们将取食器具的形态差异量化为主成分的类内差异，发现在前两个主成分上，Lepomis的差异是Micropterus的4.4和7.4倍。然而，如果给予足够的时间，谱系有望在形态和生态上多样化，这种模式可能是由于每个支系积累差异的时间不同而产生的。尽管是姐妹群，但Lepomis的最新共同祖先的年龄约为1460万年前，其谱系总长度为8640万年，而Micropterus的最新共同祖先的年龄仅约为840万年前，其总分枝长度为4290万年。我们使用特征进化的布朗运动模型检验了每个支系的独立进化时间解释了形态差异差异的假设，并确定了前两个主成分的进化速度在Lepomis中分别是4.4和7.7倍。因此，时间和系统发育不能解释Lepomis和Micropterus观察到的形态差异的差异，应该调查其他促进多样性的机制。
Evolutionary lineages differ with regard to the variety of forms they exhibit. We investigated whether comparisons of morphological diversity can be used to identify differences in ecological diversity in two sister clades of centrarchid fishes. Species in the Lepomis clade (sunfishes) feed on a wider range of prey items than species in the Micropterus clade (black basses). We quantified disparity in morphology of the feeding apparatus as within-clade variance on principal components and found that Lepomis exhibits 4.4 and 7.4 times more variance than Micropterus on the first two principal components. However, lineages are expected to diversify morphologically and ecologically given enough time, and this pattern could have arisen due to differences in the amount of time each clade has had to accumulate variance. Despite being sister groups, the age of the most recent common ancestor of Lepomis is approximately 14.6 million years ago and its lineages have a total length of 86.4 million years while the age of the most recent common ancestor of Micropterus is only about 8.4 million years ago, and it has a total branch length of 42.9 million years. We used the Brownian motion model of character evolution to test the hypothesis that time of independent evolution of each clade's lineages accounts for differences in morphological disparity and determined that the rates of evolution of the first two principal components are 4.4 and 7.7 times greater in Lepomis. Thus, time and phylogeny do not account for the differences in morphological disparity observed in Lepomis and Micropterus, and other diversity-promoting mechanisms should be investigated.