University of New Orleans, Department of Biological Sciences, 2000 Lakeshore Drive, New Orleans, LA 70148, USA
University of New Orleans, Department of Biological Sciences, 2000 Lakeshore Drive, New Orleans, LA 70148, USA.
J Exp Biol. 2020 Jul 28;223(Pt 14):jeb228098. doi: 10.1242/jeb.228098.
Standard metabolic rate (SMR), maximum metabolic rate (MMR), absolute aerobic scope (AAS) and critical oxygen tension () were determined for the Gulf killifish, , an ecologically dominant estuarine fish, acclimated to lowered salinity, elevated temperature and lowered oxygen concentration. Acclimation to low salinity resulted in a small, but significant, elevation of (suggesting lower tolerance of hypoxia); acclimation to elevated temperature increased SMR, MMR, AAS and ; acclimation to low oxygen led to a small increase in SMR, but substantial decreases in MMR, AAS and Variation in these metabolic traits among individuals was consistent and repeatable when measured during multiple control exposures over 7 months. Trait repeatability was unaffected by acclimation condition, suggesting that repeatability of these traits is not context dependent. There were significant phenotypic correlations between specific metabolic traits: SMR was positively correlated with MMR and ; MMR was positively correlated with AAS; and AAS was negatively correlated with In general, within-individual variation contributed more than among-individual variation to these phenotypic correlations. The effects of acclimation on these traits demonstrate that aerobic metabolism is plastic and influenced by the conditions experienced by these fish in the dynamic habitats in which they occur; however, the repeatability of these traits and the correlations among them suggest that these traits change in ways that maintain the rank order of performance among individuals across a range of environmental variation.
标准代谢率（SMR）、最大代谢率（MMR）、绝对需氧量范围（AAS）和临界氧分压（），用于测定海湾食蚊鱼（），一种生态优势河口鱼类，适应低盐度、高温和低氧浓度。低盐度适应导致略微但显著的升高（表明对低氧的耐受性较低）；高温适应增加了 SMR、MMR、AAS 和；低氧适应导致 SMR 略有增加，但 MMR、AAS 和 显著降低。在 7 个月的多次对照暴露期间测量时，这些代谢特征在个体之间的变化是一致且可重复的。适应条件对特征的可重复性没有影响，这表明这些特征的可重复性不受环境影响。特定代谢特征之间存在显著的表型相关性：SMR 与 MMR 和 呈正相关；MMR 与 AAS 呈正相关；AAS 与 呈负相关。一般来说，个体内变异对这些表型相关性的贡献大于个体间变异。适应对这些特征的影响表明，需氧代谢是可塑的，并受到这些鱼类在其发生的动态栖息地中经历的条件的影响；然而，这些特征的可重复性和它们之间的相关性表明，这些特征以维持个体在一系列环境变化中表现等级的方式发生变化。
