Department of Environmental Sciences, Policy, and Management, University of California, Berkeley, Berkeley, United States.
Department of Integrative Biology, University of California, Berkeley, Berkeley, United States.
J Insect Physiol. 2020 Apr;122:104037. doi: 10.1016/j.jinsphys.2020.104037. Epub 2020 Feb 19.
Temperature is known to influence many aspects of organisms and is frequently linked to geographical species distributions. Despite the importance of a broad understanding of an animal's thermal biology, few studies incorporate more than one metric of thermal biology. Here we examined an elevational assemblage of Habronattus jumping spiders to measure different aspects of their thermal biology including thermal limits (CT, CT), thermal preference, V̇CO as proxy for metabolic rate, locomotor behavior and warming tolerance. We used these data to test whether thermal biology helped explain how species were distributed across elevation. Habronattus had high CT values, which did not differ among species across the elevational gradient. The highest-elevation species had a lower CT than any other species. All species had a strong thermal preference around 37 °C. With respect to performance, one of the middle elevation species was significantly less temperature-sensitive in metabolic rate. Differences between species with respect to locomotion (jump distance) were likely driven by differences in mass, with no differences in thermal performance across elevation. We suggest that Habronattus distributions follow Brett's rule, a rule that predicts more geographical variation in cold tolerance than heat. Additionally, we suggest that physiological tolerances interact with biotic factors, particularly those related to courtship and mate choice to influence species distributions. Habronattus also had very high warming tolerance values (> 20 °C, on average). Taken together, these data suggest that Habronattus are resilient in the face of climate-change related shifts in temperature.
温度已知会影响生物的许多方面，并且经常与地理物种分布有关。尽管广泛了解动物的热生物学很重要，但很少有研究同时包含热生物学的多个指标。在这里，我们研究了 Habronattus 跳蛛的海拔组合，以测量其热生物学的不同方面，包括热极限（CT，CT）、热偏好、作为代谢率替代物的 V̇CO、运动行为和耐热性。我们使用这些数据来测试热生物学是否有助于解释物种如何在海拔上分布。Habronattus 的 CT 值较高，在整个海拔梯度上，不同物种之间没有差异。海拔最高的物种的 CT 值比其他任何物种都低。所有物种在 37°C 左右都有强烈的热偏好。就性能而言，中间海拔的一个物种在代谢率方面的温度敏感性显著降低。物种之间在运动（跳跃距离）方面的差异可能是由质量差异驱动的，而在海拔上没有发现热性能的差异。我们认为 Habronattus 的分布遵循 Brett 法则，该法则预测在耐寒性方面的地理变化大于耐热性。此外，我们认为生理耐受性与生物因素相互作用，特别是与求偶和交配选择有关的因素，影响物种分布。Habronattus 还具有非常高的耐热性值（平均>20°C）。总的来说，这些数据表明，Habronattus 在面对与气候变化相关的温度变化时具有很强的适应能力。
