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首页> 外文期刊>Journal of evolutionary biology >Functional consequences of phenotypic variation between locally adapted populations: Swimming performance and ventilation in extremophile fish
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Functional consequences of phenotypic variation between locally adapted populations: Swimming performance and ventilation in extremophile fish

机译：局部适应群体中表型变异的功能后果：Extreomophill鱼中的游泳性能和通风

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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.
机译：自然选择驱动特性的演变，以优化有机体表现，但优化性能的一个方面可以影响性能的其他方面。在这里，我们询问当地适应的鱼群之间的表型变化如何影响机动和通风，测试功能性权衡和特征性关系。具体而言，我们调查了居住在不同栖息地类型（富含硫化氢的弹簧和相邻的非尿道流）的含有居住的5种皮鱼（Poecilia Mexicana）的两种群体。对于每个人，我们在模拟捕食者攻击期间量化了不同的爆破游泳度量，稳定的游泳和鳃通气。与预测相吻合，我们记录了表现的各个方面的大量人口差异，来自苏尔希特栖息地的鱼类，表现出更高的稳定游泳性能和更高的通风能力，但爆裂游泳较慢。在稳定和爆裂游泳之间存在显着的功能性权衡，但在运动和通风的不同方面之间没有。虽然我们对人口差异的差异的调查结果在很大程度上并行对先前研究的结果，但我们提供了关于形态学变异如何影响通风和最终氧气收购的新颖见解。总体而言，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，这将有助于解开不同选择源沿复杂环境梯度的不同选择的影响。

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