Transcriptomic reaction norms highlight metabolic depression as a divergence in phenotypic plasticity between oyster species under ocean acidification.

IF 2.8 2区 生物学 Q2 BIOLOGY
Journal of Experimental Biology Pub Date : 2025-04-01 Epub Date: 2025-04-04 DOI:10.1242/jeb.249458
Mathieu Lutier, Fabrice Pernet, Vincent Vanaa, Carole Di Poi, Jérémy Le Luyer
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Abstract

Ocean acidification is occurring at a rate unprecedented for millions of years, forcing sessile organisms, such as oysters, to respond in the short term by relying on their phenotypic plasticity. But phenotypic plasticity has limits, tipping points, beyond which species will have to adapt or disappear. These limits could be related to the adaptation of species to different habitat variabilities. Here, we exposed juvenile pearl oysters, Pinctada margaritifera, to a broad pH range and determined the response at the gross physiological, lipidome and transcriptome levels. Thus, we identified its high tolerance with low pH tipping points at pH 7.3-6.8 below which most physiological parameters are impacted. We then compared the transcriptomic reaction norms of the tropical subtidal P. margaritifera with those of an intertidal temperate oyster, Crassostrea gigas, reusing data from a previous study. Despite showing similar tipping points to C. gigas, P. margaritifera exhibits strong mortality and depletion of energy reserves below these tipping points, which is not the case for C. gigas. This divergence relies mainly on the induction of metabolic depression, an adaptation to intertidal habitats in C. gigas but not P. margaritifera. Our method makes it possible to detect divergence in phenotypic plasticity, probably linked to the species' specific life-history strategies related to different habitats, which will determine the survival of species in the face of ongoing global changes. Such an approach is particularly relevant for studying the physiology of species in a world where physiological tipping points will increasingly be exceeded.

转录组反应规范强调代谢抑制是海洋酸化下牡蛎物种表型可塑性的差异。
海洋酸化以数百万年来前所未有的速度发生,迫使牡蛎等无根生物依靠其表型可塑性在短期内做出反应。表现型的可塑性是有极限的,有临界点,超过这个极限,物种就必须适应,否则就会消失。这些限制可能与物种对不同生境变化的适应有关。本研究将稚珍珠贝(Pinctada margaritifera)暴露在一个广泛的pH范围内,并在生理、脂质组和转录组水平上测定其反应。因此,我们确定了它在pH 7.3-6.8的低临界点下具有高耐受性,低于这个临界点,大多数生理参数都会受到影响。然后,我们比较了热带潮下P. margaritifera和潮间带温带牡蛎(长牡蛎)的转录组反应规范,重复使用了先前研究的数据。尽管与C. gigas表现出相似的临界点,但P. margaritifera在临界点以下表现出很高的死亡率和能量储备的消耗,这与C. gigas的情况不同。这种差异主要依赖于代谢抑制的诱导,这是对gigas的潮间带生境的适应,而不是在P. margaritifera。我们的方法可以检测到表型可塑性的差异,这可能与物种与不同栖息地相关的特定生活史策略有关,这将决定物种在持续的全球变化中的生存。在一个生理临界点将越来越被超越的世界里,这种方法对于研究物种的生理特别重要。
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来源期刊
CiteScore
5.50
自引率
10.70%
发文量
494
审稿时长
1 months
期刊介绍: Journal of Experimental Biology is the leading primary research journal in comparative physiology and publishes papers on the form and function of living organisms at all levels of biological organisation, from the molecular and subcellular to the integrated whole animal.
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