Evolution Promotes Resilience of Marine Mixotrophic Metabolic Strategies to Thermal Stress.

IF 2.7 2区 环境科学与生态学 Q2 ECOLOGY
American Naturalist Pub Date : 2025-10-01 Epub Date: 2025-07-29 DOI:10.1086/737132
Kevin M Archibald, Stephanie Dutkiewicz, Charlotte Laufkötter, Holly V Moeller
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引用次数: 0

Abstract

AbstractWarming induces metabolic changes in microbial organisms, including increased respiration. Empirical studies have shown that evolution can compensate for thermal sensitivity and reduce respiration rate at high temperatures. Evolutionary adaptation may mitigate the effects of warming, but it remains unclear to what extent organisms can overcome thermodynamic constraints through evolution. Furthermore, evolutionary adaptations are modulated by interactions with plastic changes to respiration and other metabolic traits. We develop a mechanistic model including both evolution and metabolic plasticity to explore how adaptation to temperature affects variability in metabolic traits in mixotrophic marine microorganisms under thermal stress. By combining modeling with empirical data, we show that variability in metabolic activity between mixotrophs with different temperature histories can be explained by changes to the carbon budget facilitated by evolved reductions in respiration. The model suggests that evolution enhances thermal resilience over evolutionary timescales. Evolving mixotrophs exhibit less metabolic variability in response to temperature changes. In contrast, over shorter timescales plastic responses dominate over evolutionary adaptations, producing transient changes to metabolic activity following a temperature change. These results highlight the interplay between different biological adaptive mechanisms and provide a modeling framework for representing variability in microbial metabolism in the context of climate change.

进化促进海洋混合营养代谢策略对热应激的恢复力。
变暖引起微生物的代谢变化,包括呼吸增加。经验研究表明,进化可以补偿高温下的热敏性并降低呼吸速率。进化适应可能会减轻变暖的影响,但目前尚不清楚生物体通过进化能在多大程度上克服热力学限制。此外,进化适应通过与呼吸和其他代谢特征的可塑性变化的相互作用来调节。我们建立了一个包括进化和代谢可塑性的机制模型,以探讨温度适应如何影响热胁迫下混合营养海洋微生物代谢性状的变异。通过将模型与经验数据相结合,我们发现不同温度历史的混合营养体之间代谢活动的差异可以通过进化减少呼吸所促进的碳收支变化来解释。该模型表明,在进化的时间尺度上,进化增强了热弹性。进化中的混合营养物对温度变化的反应表现出较少的代谢变异性。相比之下,在较短的时间尺度上,可塑性反应在进化适应中占主导地位,在温度变化后产生代谢活动的短暂变化。这些结果强调了不同生物适应机制之间的相互作用,并为气候变化背景下微生物代谢的变异性提供了一个建模框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
American Naturalist
American Naturalist 环境科学-进化生物学
CiteScore
5.40
自引率
3.40%
发文量
194
审稿时长
3 months
期刊介绍: Since its inception in 1867, The American Naturalist has maintained its position as one of the world''s premier peer-reviewed publications in ecology, evolution, and behavior research. Its goals are to publish articles that are of broad interest to the readership, pose new and significant problems, introduce novel subjects, develop conceptual unification, and change the way people think. AmNat emphasizes sophisticated methodologies and innovative theoretical syntheses—all in an effort to advance the knowledge of organic evolution and other broad biological principles.
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