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Dissecting a potential spandrel of adaptive radiation: Body depth and pectoral fin ecomorphology coevolve in Lake Malawi cichlid fishes

机译:剖析潜在的适应辐射斑:马拉维丽鱼科鱼的体深和胸鳍生态形态共同演化

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摘要

The evolution of body shape reflects both the ecological factors structuring organismal diversity as well as an organism's underlying anatomy. For instance, body depth in fishes is thought to determine their susceptibility to predators, attractiveness to mates, as well as swimming performance. However, the internal anatomy influencing diversification of body depth has not been extensively examined, and changes in body depth could arise as a by‐product of functional changes in other anatomical structures. Using an improved phylogenetic hypothesis for a diverse set of Lake Malawi cichlid fishes, we tested the evolutionary association between body depth and the height of the pectoral girdle. To refine the functional importance of the observed substantial correlation, we also tested the coevolution of pectoral girdle height and pectoral fin area. The extensive coevolution of these traits suggests body depth in fishes like the Lake Malawi cichlids could diverge simply as a by‐product of being tightly linked to ecomorphological divergence in other functional morphological structures like the pectoral fins.
机译:身体形态的演变既反映了构成生物多样性的生态因素,也反映了生物的基本解剖结构。例如,鱼类的体深被认为决定了它们对捕食者的敏感性,对伴侣的吸引力以及游泳能力。但是,影响人体深度多样化的内部解剖结构尚未得到广泛研究,并且人体深度的变化可能是其他解剖结构功能变化的副产品而产生。使用针对不同种类的马拉维丽鱼科鱼类的改进的系统发育假说,我们测试了体深与胸带高度之间的进化联系。为了完善所观察到的基本相关性的功能重要性,我们还测试了胸带高度和胸鳍面积的协同进化。这些特征的广泛共进化表明,像马拉维丽鱼科鱼这样的鱼类的体深可能会因与其他功能形态结构(如胸鳍)中的生态形态差异紧密相关而副生。

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