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首页> 外文期刊>Biogeosciences >Ocean acidification increases the sensitivity of and variability in physiological responses of an intertidal limpet to thermal stress
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Ocean acidification increases the sensitivity of and variability in physiological responses of an intertidal limpet to thermal stress

机译：海洋酸化增加了潮间对热应力的敏感性和生理反应的可变性

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Understanding physiological responses of organisms to warming and ocean acidification is the first step towards predicting the potential population- and community-level ecological impacts of these stressors. Increasingly, physiological plasticity is being recognized as important for organisms to adapt to the changing microclimates. Here, we evaluate the importance of physiological plasticity for coping with ocean acidification and elevated temperature, and its variability among individuals, of the intertidal limpet Cellana toreuma from the same population in Xiamen. Limpets were collected from shaded mid-intertidal rock surfaces. They were acclimated under combinations of different pCOsub2/sub concentrations (400 and 1000?ppm, corresponding to a pH of?8.1 and 7.8) and temperatures (20 and 24?°C) in a short-term period (7?days), with the control conditions (20?°C and 400?ppm) representing the average annual temperature and present-day pCOsub2/sub level at the collection site. Heart rates (as a proxy for metabolic performance) and expression of genes encoding inducible and constitutive heat-shock proteins (hsp70 and hsc70) at different heat-shock temperatures (26, 30, 34, and 38?°C) were measured. Hsp70 and Hsc70 play important roles in protecting cells from heat stresses, but have different expression patterns, with Hsp70 significantly increased in expression during stress and Hsc70 constitutively expressed and only mildly induced during stress. Analysis of heart rate showed significantly higher temperature coefficients (Qsub10/sub rates) for limpets at 20?°C than at 24?°C and post-acclimation thermal sensitivity of limpets at 400?ppm was lower than at 1000?ppm. Expression of hsp70 linearly increased with the increasing heat-shock temperatures, with the largest slope occurring in limpets acclimated under a future scenario (24?°C and 1000?ppm pCOsub2/sub). These results suggested that limpets showed increased sensitivity and stress response under future conditions. Furthermore, the increased variation in physiological response under the future scenario indicated that some individuals have higher physiological plasticity to cope with these conditions. While short-term acclimation to reduced pH seawater decreases the ability of partial individuals against thermal stress, physiological plasticity and variability seem to be crucial in allowing some intertidal animals to survive in a rapidly changing environment.
机译：了解生物体对变暖和海洋酸化的生理反应是预测这些压力源潜在的人口和社区层面生态影响的第一步。人们越来越认识到生理可塑性对于生物体适应不断变化的微气候至关重要。在这里，我们评估了生理可塑性对于应对海洋酸化和温度升高的重要性，以及其在厦门同一人口潮间带Cell壳蛤中个体间的变异性。从潮间带阴影的岩石表面收集了帽毛。它们在短期内在不同pCO 2 浓度（400和1000？ppm，对应于pH值分别为8.1和7.8）和温度（20和24℃）的组合下适应环境。 （7天），控制条件（20℃和400ppm）代表收集地点的年平均温度和今天的pCO 2 水平。在不同的热休克温度（26、30、34和38℃）下，测量了心率（代表新陈代谢的表现）和编码诱导型和组成型热休克蛋白（hsp70和hsc70）的基因的表达。 Hsp70和Hsc70在保护细胞免受热应激中起重要作用，但是具有不同的表达方式，其中Hsp70在应激过程中的表达显着增加，而Hsc70组成型表达并且在应激过程中仅被轻度诱导。心率分析表明，在20°C时，帽贝的温度系数（Q 10 速率）明显高于在24°C时，并且在400？ppm时，帽贝的驯化后热敏性低于1000？ppm。 hsp70的表达随着热休克温度的升高而线性增加，最大的斜率出现在帽贝上，这是在未来的情况下（24？C和1000？ppm pCO 2 ）适应的。这些结果表明，在将来的条件下，帽贝表现出更高的敏感性和应激反应。此外，在未来情况下生理反应的变化增加表明某些个体具有较高的生理可塑性以应对这些状况。虽然短期适应降低pH值的海水会降低部分个体抵抗热应激的能力，但生理可塑性和可变性似乎对于允许某些潮间动物在快速变化的环境中生存至关重要。

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