Physiol Biochem Zool. 2023 Jul-Aug;96(4):272-281. doi: 10.1086/725237. Epub 2023 Jun 7.
AbstractEctothermic species are dependent on temperature, which drives many aspects of their physiology, including locomotion. The distribution of the native populations of is characterized by an exceptional range in latitude and altitude. Along altitudinal gradients, thermal environments change, and populations experience different temperatures. In this study, we compared critical thermal limits and thermal performance curves of populations from the native range across an altitudinal gradient to test whether optimal temperatures for exertion differ depending on altitude. Data on exertion capacity were collected at six different temperatures (8°C, 12°C, 16°C, 19°C, 23°C, and 27°C) for four populations spanning an altitudinal gradient (60, 1,016, 1,948, and 3,197 m asl). Results show that the thermal performance optimum differs among populations. Populations from cold environments at high altitudes exhibit a lower optimal performance temperature than populations from warmer environments at lower altitudes. The ability of this species to change its optimal temperature for locomotor exertion across extremely different climatic environments within the native range may help explain its exceptional invasive potential. These results suggest that ectothermic species capable of adapting to broad altitudinal ranges may be particularly good at invading novel climatic areas, given their ability to cope with a wide range of variation in environmental temperatures.
摘要
变温动物依赖于温度，这驱动了它们生理的许多方面，包括运动。 的原生种群分布的特点是在纬度和海拔上有异常的范围。在海拔梯度上，热环境发生变化，种群经历不同的温度。在这项研究中，我们比较了来自原生范围的种群在海拔梯度上的临界热极限和热性能曲线，以测试运动的最佳温度是否因海拔而异。在六个不同温度（8°C、12°C、16°C、19°C、23°C 和 27°C）下，我们为跨越海拔梯度（60、1016、1948 和 3197 米海拔）的四个种群收集了运动能力的数据。结果表明，种群间的热性能最佳值不同。来自高海拔寒冷环境的种群表现出比来自低海拔温暖环境的种群更低的最佳性能温度。这种物种在其原生范围内的极其不同的气候环境中改变其运动用力的最佳温度的能力，可能有助于解释其异常的入侵潜力。这些结果表明，能够适应广泛海拔范围的变温动物可能特别擅长入侵新的气候区，因为它们能够应对环境温度的广泛变化。
