Sánchez-González Jorge-Rubén, Nicieza Alfredo G
Department of Organisms and Systems Biology, University of Oviedo, 33006 Oviedo, Spain.
Department of Animal Science-Wildlife Section, University of Lleida, 25006 Lleida, Spain.
Curr Zool. 2022 May 25;69(3):294-303. doi: 10.1093/cz/zoac042. eCollection 2023 Jun.
Body shape and metabolic rate can be important determinants of animal performance, yet often their effects on influential traits are evaluated in a non-integrated way. This creates an important gap because the integration between shape and metabolism may be crucial to evaluate metabolic scaling theories. Here, we measured standard metabolic rate in 1- and 2-years old juvenile brown trout , and used a geometric morphometrics approach to extricate the effects of ontogeny and size on the link between shape and metabolic scaling. We evidenced near-isometric ontogenetic scaling of metabolic rate with size, but also a biphasic pattern driven by a significant change in metabolic scaling, from positive to negative allometry. Moreover, the change in metabolic allometry parallels an ontogenetic change from elongate to deep-bodied shapes. This is consistent with the dynamic energy budget (DEB) and surface area (SA) theories, but not with the resource transport network theory which predicts increasing allometric exponents for trends towards more robust, three-dimensional bodies. In addition, we found a relationship between body shape and size independent metabolic rate, with a positive correlation between robustness and metabolic rate, which fits well within the view of Pace-of-Life Syndromes (POLS). Finally, our results align with previous studies that question the universality of metabolic scaling exponents and propose other mechanistic models explaining the diversity of metabolic scaling relationships or emphasizing the potential contribution of ecological factors.
体型和代谢率可能是动物表现的重要决定因素，但它们对有影响力的性状的影响往往是以非综合的方式进行评估的。这造成了一个重要的差距，因为体型与代谢之间的整合对于评估代谢标度理论可能至关重要。在这里，我们测量了1岁和2岁幼年褐鳟的标准代谢率，并使用几何形态测量学方法来厘清个体发育和体型对体型与代谢标度之间联系的影响。我们证明了代谢率随体型呈近等距的个体发育标度，但也存在一种双相模式，这是由代谢标度的显著变化驱动的，从正向异速生长变为负向异速生长。此外，代谢异速生长的变化与从细长体型到深体型的个体发育变化平行。这与动态能量收支（DEB）和表面积（SA）理论一致，但与资源运输网络理论不一致，后者预测对于趋向于更粗壮的三维体型的趋势，异速生长指数会增加。此外，我们发现体型与与体型无关的代谢率之间存在关系，健壮性与代谢率呈正相关，这与生活节奏综合征（POLS）的观点非常契合。最后，我们的结果与之前的研究一致，这些研究对代谢标度指数的普遍性提出质疑，并提出了其他机制模型来解释代谢标度关系的多样性或强调生态因素的潜在贡献。
