Functional consequences of phenotypic variation between locally adapted populations: Swimming performance and ventilation in extremophile fish
Functional consequences of phenotypic variation between locally adapted populations: Swimming performance and ventilation in extremophile fish
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DOI：
10.1111/jeb.13586
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发表时间：
2020-01
影响因子：
2.1
通讯作者：
H. Camarillo;Lenin Arias Rodriguez;M. Tobler
中科院分区：
文献类型：
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作者：
H. Camarillo;Lenin Arias Rodriguez;M. Tobler
自然选择推动性状的进化以优化生物体的性能，但性能的一个方面的优化可能会影响性能的其他方面。在这里，我们询问了当地适应鱼类种群之间的表型变异如何影响运动和通风，测试功能权衡和性状-性能相关性。具体来说，我们调查了两个种群的livebearing鱼（Poecilia mexicana），栖息在不同的栖息地类型（富含硫化氢的泉水和邻近的nonsulphidic流）。对于每个人，我们量化了不同的指标，在模拟捕食者攻击，稳定游泳和鳃通风的爆发游泳。与预测相吻合，我们记录了显着的人口差异，在各个方面的性能，与鱼类硫化物栖息地表现出较高的稳定游泳性能和较高的通风能力，但较慢的爆发游泳。在稳定和爆发性游泳之间存在显著的功能权衡，但在运动和通气的不同方面之间没有。虽然我们关于运动表现的群体差异的发现在很大程度上与以前的研究结果平行，但我们提供了关于形态变化如何影响通气和最终氧气获取的新见解。总的来说，我们的分析提供了对先前记录的表型变异的功能后果的见解，这将有助于解开可能沿着沿着复杂环境梯度一致的不同选择来源的影响。
Natural selection drives the evolution of traits to optimize organismal performance, but optimization of one aspect of performance can influence other aspects of performance. Here, we asked how phenotypic variation between locally adapted fish populations affects locomotion and ventilation, testing for functional trade‐offs and trait–performance correlations. Specifically, we investigated two populations of livebearing fish (Poecilia mexicana) that inhabit distinct habitat types (hydrogen‐sulphide‐rich springs and adjacent nonsulphidic streams). For each individual, we quantified different metrics of burst swimming during simulated predator attacks, steady swimming and gill ventilation. Coinciding with predictions, we documented significant population differences in all aspects of performance, with fish from sulphidic habitats exhibiting higher steady swimming performance and higher ventilation capacity, but slower burst swimming. There was a significant functional trade‐off between steady and burst swimming, but not between different aspects of locomotion and ventilation. Although our findings about population differences in locomotion performance largely parallel the results from previous studies, we provide novel insights about how morphological variation might impact ventilation and ultimately oxygen acquisition. Overall, our analyses provided insights into the functional consequences of previously documented phenotypic variation, which will help to disentangle the effects of different sources of selection that may coincide along complex environmental gradients.