The Effect of Locomotion Mode on Body Shape Evolution in Teleost Fishes.
The Effect of Locomotion Mode on Body Shape Evolution in Teleost Fishes.
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DOI：
10.1093/iob/obab016
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Wainwright PC
中科院分区：
文献类型：
--
作者：
Friedman ST;Price SA;Wainwright PC
硬骨鱼依靠中鳍和成对鳍（MPF）或身体波动（BCF）在直线稳定游泳时产生推力。先前的研究表明，游泳模式与不同的体型有关，尽管这一点从未在鱼类的多样性中得到实证证明。由于强积金游泳运动员的身体在稳定游泳中没有积极的机械作用，这可能会放松限制，促进体型多样化。我们通过测量主导的稳定游泳模式对2295种海洋硬骨鱼体型进化的影响来验证这些预测。与以往的预期一致，BCF选手表现出更细长的身体形状，而MPF推进与更深更宽的身体形状有关。然而，与预期相反，我们发现BCF推进与更高的形态多样性和更大的性状最优方差相关。这一令人惊讶的结果与更强的功能权衡刺激而不是限制表型进化的解释是一致的。
Teleost fishes vary in their reliance on median and paired fins (MPF) or undulation of the body (BCF) to generate thrust during straight-line, steady swimming. Previous work indicates that swimming mode is associated with different body shapes, though this has never been empirically demonstrated across the diversity of fishes. As the body does not play as active a mechanical role in steady swimming by MPF swimmers, this may relax constraints and spur higher rates of body shape diversification. We test these predictions by measuring the impact of the dominant steady swimming mode on the evolution of body shape across 2295 marine teleost fishes. Aligning with historical expectations, BCF swimmers exhibit a more elongate, slender body shape, while MPF propulsion is associated with deeper and wider body shapes. However, in contrast to expectations, we find that BCF propulsion is associated with higher morphological diversity and greater variance around trait optima. This surprising result is consistent with the interpretation that stronger functional trade-offs stimulate phenotypic evolution, rather than constrain it.
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