在两个纬度相距甚远的潮上带水甲虫种群中测试新陈代谢的寒冷适应性和气候变异假说。

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
J.M. Mirón-Gatón , J. Velasco , S. Pallarés , A.J. García-Meseguer , A. Millán , D.T. Bilton
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引用次数: 0

摘要

温度对外温动物的生理机能有很大影响,其耐热性和新陈代谢特征通常随物种分布范围的纬度而变化。然而,这种变化的驱动因素仍不清楚,尽管面对持续的全球变化,这种变化对种群的持续性和保护有着明显的影响。本研究探讨了潮上带岩池甲虫(Ochthebius lejolisii)代谢率和热极限的局部适应性和表型可塑性。我们利用该物种分布范围两端不同地区的种群,同时测试了空间生理生态学的两个主要范式:代谢冷适应(MCA)和气候变异假说(CVH)。在两地的春季温度条件下,结合当地的昼夜变化进行了相互适应。通过封闭式呼吸测定法测量了代谢率,并通过热成像仪估算了热耐受极限。高纬度种群(气候较冷)在较低温度下的代谢率和温度系数(Q10s)均高于低纬度种群,这与 MCA 的结果一致。正如 CVH 预测的那样,低纬度种群(气候更多变)表现出更高的热耐受上限,但只有高纬度种群能够适应热上限。这一结果表明,该物种在生理热极限和热可塑性之间存在权衡。由于适应能力有限,地中海沿岸的种群在气候变化导致极端气温升高的情况下尤其脆弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Testing metabolic cold adaptation and the climatic variability hypothesis in two latitudinally distant populations of a supratidal water beetle

Temperature significantly impacts ectotherm physiology, with thermal tolerance and metabolic traits typically varying with latitude across species ranges. The drivers of this variation remain unclear, however, despite obvious consequences for population persistence and conservation in the face of ongoing global change. This study explored local adaptation and phenotypic plasticity of metabolic rates and thermal limits in the supratidal rockpool beetle Ochthebius lejolisii. Using populations from localities at different ends of the species range that experience contrasting thermal variability, we simultaneously tested two of the major paradigms of spatial physiological ecology: metabolic cold adaptation (MCA) and the climatic variability hypothesis (CVH). Reciprocal acclimation was conducted under spring temperature regimes of both localities, incorporating local diurnal variation. Metabolic rates were measured by closed respirometry, and thermal tolerance limits estimated through thermography. In line with MCA, the higher-latitude population (colder climate) showed higher metabolic rates and temperature coefficients (Q10s) at lower temperatures than the lower-latitude population. As predicted by the CVH, the lower-latitude population (more variable climate) showed higher upper thermal tolerance but only the higher-latitude population was able to acclimate upper thermal limits. This result suggests trade-offs between physiological thermal limits and thermal plasticity in this species. A limited acclimation capacity could make populations on Mediterranean coasts especially vulnerable in the face of projected increases in extreme temperatures under ongoing climate change.

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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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