Ecological Influences and Morphological Correlates of Resting and Maximal Metabolic Rates across Teleost Fish Species
Ecological Influences and Morphological Correlates of Resting and Maximal Metabolic Rates across Teleost Fish Species
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DOI：
10.1086/685893
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发表时间：
2016-05-01
影响因子：
2.9
通讯作者：
Halsey, Lewis G.
中科院分区：
文献类型：
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作者：
Killen, Shaun S.;Glazier, Douglas S.;Halsey, Lewis G.
有氧代谢的速率在不同的进化谱系中有很大的差异，但人们对产生和维持这种变异性的最接近和最终因素知之甚少。利用131硬骨鱼种的数据，我们进行了一个大规模的系统发育比较分析，如何种间变异的静息代谢率（RMR）和最大代谢率（MMR）与几个生态和形态变量。质量和温度调整的RMR和MMR是高度相关的沿着一个连续跨越30至40倍的范围。系统发育广义最小二乘模型表明，RMR和MMR是较高的中上层物种和物种具有较高的营养级表现出较高的MMR。这种变化反映在不同层次的结构组织：鳃表面积，肌肉蛋白质含量和尾鳍长宽比（代理活动）与有氧能力呈正相关。肌肉蛋白质含量和尾鳍长径比也与RMR呈正相关。耐缺氧谱系位于代谢连续体的低端。不同的生态生活方式与有氧能力的对比水平有关，这可能反映了一方面选择增加运动性能和另一方面对低资源可用性（特别是氧气）的耐受性之间的相互作用。这些结果支持有氧能力模型的进化的恒温，表明升高的体温演变为相关的反应，选择高活动水平。
Rates of aerobic metabolism vary considerably across evolutionary lineages, but little is known about the proximate and ultimate factors that generate and maintain this variability. Using data for 131 teleost fish species, we performed a large-scale phylogenetic comparative analysis of how interspecific variation in resting metabolic rates (RMRs) and maximum metabolic rates (MMRs) is related to several ecological and morphological variables. Mass-and temperature-adjusted RMR and MMR are highly correlated along a continuum spanning a 30- to 40-fold range. Phylogenetic generalized least squares models suggest that RMR and MMR are higher in pelagic species and that species with higher trophic levels exhibit elevated MMR. This variation is mirrored at various levels of structural organization: gill surface area, muscle protein content, and caudal fin aspect ratio (a proxy for activity) are positively related with aerobic capacity. Muscle protein content and caudal fin aspect ratio are also positively correlated with RMR. Hypoxia-tolerant lineages fall at the lower end of the metabolic continuum. Different ecological lifestyles are associated with contrasting levels of aerobic capacity, possibly reflecting the interplay between selection for increased locomotor performance on one hand and tolerance to low resource availability, particularly oxygen, on the other. These results support the aerobic capacity model of the evolution of endothermy, suggesting elevated body temperatures evolved as correlated responses to selection for high activity levels.