Correa-Orellana Mariangel, Romero Ash, Zwonitzer Kendra D, Sakihara Troy S, Hawk Cassidy, Nguyen Alice T, Iverson Erik N K, Havird Justin C
University of Texas at Austin, Integrative Biology, Austin, TX, USA.
State of Hawaii Department of Land and Natural Resources, Division of Aquatic Resources, Hilo, HI, USA.
J Therm Biol. 2025 Jul;131:104149. doi: 10.1016/j.jtherbio.2025.104149. Epub 2025 Jun 2.
Animals may respond to threats from climate change through plastic physiological changes (i.e., acclimation), adaptive evolution (i.e., genetic change), or moving to new habitats that match their climatic niche. Organisms from volcanic habitats are underexplored but may serve as models for physiological and evolutionary responses to warming temperatures. Here, we examined how different genetic lineages of the Hawaiian anchialine shrimp Halocaridina rubra respond to temperature, including animals from noticeably warm habitats created during eruptions of Kilauea in 2018. We find that thermal limits are elevated in animals from newer, warm habitats, but decrease to match those of animals from older, cooler habitats after being maintained at room temperature. Laboratory experiments further suggest thermal limits are mainly shaped by acclimation. In contrast, metabolic rates show almost no acclimation responses to temperature, with rates largely explained by test, not acclimation temperatures. There was little difference in thermal acclimation of metabolic rates among animals from different genetic lineages. However, metabolic rates at room temperature were different among shrimps from different genetic lineages, suggesting genetic variation for aerobic metabolism could be a target of selection during climate change. We find that shrimp from newer, warm habitats can live at or near their critical thermal maximum, suggesting some anchialine species may be able to deal with increased temperatures from climate change by being pre-adapted to colonize warm habitats associated with volcanism. We also highlight the potential impacts of climate change on anchialine habitats and suitable experimental designs for categorizing and quantifying thermal acclimation of biological rates.
动物可能会通过可塑性生理变化（即驯化）、适应性进化（即基因变化）或迁移到与其气候生态位相匹配的新栖息地来应对气候变化带来的威胁。来自火山栖息地的生物尚未得到充分研究，但它们可能是生理和进化对温度升高响应的模型。在这里，我们研究了夏威夷内陆虾Halocaridina rubra的不同遗传谱系如何对温度作出反应，其中包括来自2018年基拉韦厄火山喷发期间形成的明显温暖栖息地的动物。我们发现，来自较新的温暖栖息地的动物的热极限有所提高，但在室温下饲养后，热极限会降低，与来自较旧的凉爽栖息地的动物的热极限相匹配。实验室实验进一步表明，热极限主要由驯化形成。相比之下，代谢率对温度几乎没有驯化反应，代谢率主要由测试温度而非驯化温度决定。不同遗传谱系的动物在代谢率的热驯化方面几乎没有差异。然而，来自不同遗传谱系的虾在室温下的代谢率不同，这表明有氧代谢的遗传变异可能是气候变化期间选择的目标。我们发现，来自较新的温暖栖息地的虾可以在其临界热最大值或接近临界热最大值的温度下生存，这表明一些内陆虾物种可能能够通过预先适应在与火山活动相关的温暖栖息地定殖来应对气候变化带来的温度升高。我们还强调了气候变化对内陆虾栖息地的潜在影响，以及用于分类和量化生物速率热驯化的合适实验设计。
