Interindividual Variation in Thermal Sensitivity of Maximal Sprint Speed, Thermal Behavior, and Resting Metabolic Rate in a Lizard
Interindividual Variation in Thermal Sensitivity of Maximal Sprint Speed, Thermal Behavior, and Resting Metabolic Rate in a Lizard
复制标题
DOI：
10.1086/671376
复制
发表时间：
2013-07-01
影响因子：
1.6
通讯作者：
Le Galliard, Jean-Francois
中科院分区：
文献类型：
--
作者：
Artacho, Paulina;Jouanneau, Isabelle;Le Galliard, Jean-Francois
表现和行为性状与环境因素的关系的研究往往忽视个体间的变异，即使这种变异的量化是理解表型性状如何进化的基础。在外温动物中，运动性能、热行为和能量代谢的功能整合是特别感兴趣的，因为这些特征之间存在着相互适应的潜力。基于这个原因，我们分析了最大冲刺速度的热敏感性、偏好体温、热精度和静息代谢率的个体间变异、协变和重复性。200种常见的蜥蜴（Zootoca vivipara），性别、年龄和体型各不相同。我们发现显着的个体间的变化，在选定的体温和最大冲刺速度的热性能曲线的截距（预期的性状值在平均温度）和斜率（热敏感性的措施）。不同温度下最大冲刺速度、首选体温和热精度的个体间差异具有显著的可重复性。偏好体温与热精度之间存在正相关关系，表明个体选择较高的温度更精确。静息代谢率变化很大，但与最大冲刺速度或热行为的热敏感性无关。因此，运动性能，热行为和能量代谢没有直接的功能联系在共同的蜥蜴。
Studies of the relationship of performance and behavioral traits with environmental factors have tended to neglect interindividual variation even though quantification of this variation is fundamental to understanding how phenotypic traits can evolve. In ectotherms, functional integration of locomotor performance, thermal behavior, and energy metabolism is of special interest because of the potential for coadaptation among these traits. For this reason, we analyzed interindividual variation, covariation, and repeatability of the thermal sensitivity of maximal sprint speed, preferred body temperature, thermal precision, and resting metabolic rate measured in ca. 200 common lizards (Zootoca vivipara) that varied by sex, age, and body size. We found significant interindividual variation in selected body temperatures and in the thermal performance curve of maximal sprint speed for both the intercept (expected trait value at the average temperature) and the slope (measure of thermal sensitivity). Interindividual differences in maximal sprint speed across temperatures, preferred body temperature, and thermal precision were significantly repeatable. A positive relationship existed between preferred body temperature and thermal precision, implying that individuals selecting higher temperatures were more precise. The resting metabolic rate was highly variable but was not related to thermal sensitivity of maximal sprint speed or thermal behavior. Thus, locomotor performance, thermal behavior, and energy metabolism were not directly functionally linked in the common lizard.