Thermal tolerance of giant salmonfly nymphs (Pteronarcys californica) varies across populations in a regulated river.

IF 2.6 3区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION
Conservation Physiology Pub Date : 2024-07-05 eCollection Date: 2024-01-01 DOI:10.1093/conphys/coae043
Christine E Verhille, Michael MacDonald, Ben Noble, Gavin Demorest, Alzada Roche, Kayleigh Frazier, Lindsey K Albertson
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引用次数: 0

Abstract

Warming of aquatic ecosystems is transforming the distribution, phenology and growth of the organisms dependent upon these ecosystems. Aquatic insects such as stoneflies are especially vulnerable to warming because the aquatic nymph stage of their life cycle depends on cool, well-oxygenated, flowing water habitat. We tracked thermal effects on available aerobic capacity of the aquatic nymph stage of an iconic and vulnerable stonefly species, the giant salmonfly (Pteronarcys californica), to compare habitat thermal regime measurements for two salmonfly populations from habitats separated by a gradient in summer weekly maximum temperatures. Contrary to expectations, the thermal optima range of the warmer habitat population was cooler than for the cooler habitat population. We posit that this unexpected interpopulation variation in thermal response is more strongly driven by diel and seasonal thermal variability than by the highest summer temperatures experienced within respective habitats. Additionally, we show that summer daily maximum temperatures could result in periodic limits in available aerobic capacity to support work of the warmer habitat nymphs and may be the mechanism underlying reduced abundance relative to the upstream cooler habitat population. Our findings provide insight into potential thermal and metabolic mechanisms that could regulate the success of ecological and culturally important aquatic insect species experiencing global change. We conclude that thermal regimes and thermal variation, not just mean and maximum temperatures, are critical drivers of aquatic insect responses to water temperatures.

大马哈鱼若虫(Pteronarcys californica)的耐热性在一条受管制河流中的不同种群之间存在差异。
水生生态系统的变暖正在改变依赖这些生态系统的生物的分布、物候和生长。水生昆虫(如石蝇)尤其容易受到气候变暖的影响,因为它们生命周期中的水生若虫阶段依赖于凉爽、氧气充足的流水栖息地。我们跟踪了热对一种标志性的脆弱石蝇物种--大鲑蝇(Pteronarcys californica)水生若虫阶段的有氧能力的影响,以比较来自夏季每周最高气温梯度分隔的栖息地的两个鲑蝇种群的栖息地热制度测量结果。与预期相反,温度较高的栖息地种群的最佳热量范围比温度较低的栖息地种群要低。我们认为,这种出乎意料的种群间热反应差异更多是受日间和季节性热变化的影响,而不是受各自栖息地内夏季最高温度的影响。此外,我们还发现,夏季日最高气温可能会导致有氧能力的周期性限制,从而无法支持较温暖栖息地若虫的工作,这可能是导致上游较凉爽栖息地种群若虫数量减少的根本原因。我们的研究结果让我们深入了解了潜在的热和新陈代谢机制,这些机制可能会调节经历全球变化的生态和文化上重要的水生昆虫物种的成功。我们的结论是,热制度和热变化,而不仅仅是平均温度和最高温度,是水生昆虫对水温反应的关键驱动因素。
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来源期刊
Conservation Physiology
Conservation Physiology Environmental Science-Management, Monitoring, Policy and Law
CiteScore
5.10
自引率
3.70%
发文量
71
审稿时长
11 weeks
期刊介绍: Conservation Physiology is an online only, fully open access journal published on behalf of the Society for Experimental Biology. Biodiversity across the globe faces a growing number of threats associated with human activities. Conservation Physiology will publish research on all taxa (microbes, plants and animals) focused on understanding and predicting how organisms, populations, ecosystems and natural resources respond to environmental change and stressors. Physiology is considered in the broadest possible terms to include functional and mechanistic responses at all scales. We also welcome research towards developing and refining strategies to rebuild populations, restore ecosystems, inform conservation policy, and manage living resources. We define conservation physiology broadly and encourage potential authors to contact the editorial team if they have any questions regarding the remit of the journal.
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