DISTINCT EVOLUTIONARY PATTERNS OF BRAIN AND BODY SIZE DURING ADAPTIVE RADIATION
DISTINCT EVOLUTIONARY PATTERNS OF BRAIN AND BODY SIZE DURING ADAPTIVE RADIATION
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DOI：
10.1111/j.1558-5646.2009.00705.x
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发表时间：
2009-09-01
期刊：
影响因子：
3.3
通讯作者：
Kolm, Niclas
中科院分区：
文献类型：
--
作者：
Gonzalez-Voyer, Alejandro;Winberg, Svante;Kolm, Niclas
形态性状通常在遗传和/或表型上相互相关，这种共变可以对个体性状的进化产生重要影响。脊椎动物大脑大小和身体大小之间的强烈正相关关系吸引了很多人的兴趣，围绕这两个特征之间异速生长关系的研究因素也有很多争论。本研究通过对坦噶尼干慈鲷适应辐射的比较分析，分别探讨了脑大小和体大小的进化模式。我们发现体型表现出最近爆发的快速进化，这种模式与与生态专门化相关的分化一致。另一方面，大脑重量并没有显示出突然的分化，而是以一种渐进的方式进化。因此，我们的研究结果表明，即使是高度遗传相关的性状也会呈现出明显不同的进化模式，因此，从现有分类群的相关性来解释性状的进化模式可能会产生误导。此外，我们的研究结果表明，与理论预期相反，大脑大小在适应性辐射中并不起关键作用。
Morphological traits are often genetically and/or phenotypically correlated with each other and such covariation can have an important influence on the evolution of individual traits. The strong positive relationship between brain size and body size in vertebrates has attracted a lot of interest, and much debate has surrounded the study of the factors responsible for the allometric relationship between these two traits. Here, we use comparative analyses of the Tanganyikan cichlid adaptive radiation to investigate the patterns of evolution for brain size and body size separately. We found that body size exhibited recent bursts of rapid evolution, a pattern that is consistent with divergence linked to ecological specialization. Brain weight on the other hand, showed no bursts of divergence but rather evolved in a gradual manner. Our results thus show that even highly genetically correlated traits can present markedly different patterns of evolution, hence interpreting patterns of evolution of traits from correlations in extant taxa can be misleading. Furthermore, our results suggest, contrary to expectations from theory, that brain size does not play a key role during adaptive radiation.