Higher metabolic plasticity in temperate compared to tropical lizards suggests increased resilience to climate change

IF 7.1 1区 环境科学与生态学 Q1 ECOLOGY Ecological Monographs Pub Date : 2022-02-09 DOI:10.1002/ecm.1512
Baojun Sun, Caroline M. Williams, Teng Li, John R. Speakman, Zengguang Jin, Hongliang Lu, Laigao Luo, Weiguo Du
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引用次数: 12

Abstract

Patterns in functional diversity of organisms at large spatial scales can provide insight into possible responses to future climate change, but it remains a challenge to link large-scale patterns at the population or species level to their underlying physiological mechanisms at the individual level. The climate variability hypothesis predicts that temperate ectotherms will be less vulnerable to climate warming compared with tropical ectotherms, due to their superior acclimatization capacity. However, metabolic acclimatization occurs over multiple levels, from the enzyme and cellular level, through organ systems, to whole-organism metabolic rate (from this point forwards biological hierarchy). Previous studies have focused on one or a few levels of the biological hierarchy, leaving us without a general understanding of how metabolic acclimatization might differ between tropical and temperate species. Here, we investigated thermal acclimation of three species of Takydromus lizards distributed along a broad latitudinal gradient in China, by studying metabolic modifications at the level of the whole organism, organ, mitochondria, metabolome, and proteome. As predicted by the climate variability hypothesis, the two temperate species T. septentrionalis and T. wolteri had an enhanced acclimation response at the whole organism level compared with the tropical species T. sexlineatus, as measured by respiratory gas exchange rates. However, the mechanisms by which whole organism performance was modified was strikingly different in the two temperate species: widespread T. septentrionalis modified organ sizes, whereas the narrowly distributed T. wolteri relied on mitochondrial, proteomic and metabolomic regulation. We suggest that these two mechanisms of thermal acclimatization may represent general strategies used by ectotherms, with distinct ecological costs and benefits. Lacking either of these mechanisms of thermal acclimatization capacity, the tropical species is likely to have increased vulnerability to climate change.

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与热带蜥蜴相比,温带蜥蜴的代谢可塑性更高,这表明它们对气候变化的适应能力更强
生物在大空间尺度上的功能多样性模式可以帮助我们了解对未来气候变化的可能响应,但将种群或物种水平上的大尺度模式与个体水平上的潜在生理机制联系起来仍然是一个挑战。气候变率假说预测温带变温动物比热带变温动物更不容易受到气候变暖的影响,因为温带变温动物具有更强的适应能力。然而,代谢适应发生在多个水平上,从酶和细胞水平,通过器官系统,到整个生物体的代谢率(从这一点开始的生物层次)。以前的研究主要集中在生物层次的一个或几个层次上,使我们对热带和温带物种之间的代谢适应可能有何不同没有一个大致的了解。本文以分布在中国广阔纬度梯度上的三种棘蜥为研究对象,从整体、器官、线粒体、代谢组和蛋白质组等方面研究了它们的热驯化过程。根据气候变率假说预测,在整个生物体水平上,温带种七毛绦虫和wolteri比热带种sexlineatus有更强的适应反应。然而,在两个温带物种中,整个生物体性能改变的机制明显不同:广泛分布的七毛绦虫改变了器官大小,而分布狭窄的沃尔氏体则依赖于线粒体、蛋白质组学和代谢组学调节。我们认为这两种热适应机制可能代表了变温动物采用的一般策略,具有不同的生态成本和效益。缺乏这两种热适应能力的机制,热带物种对气候变化的脆弱性可能会增加。
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来源期刊
Ecological Monographs
Ecological Monographs 环境科学-生态学
CiteScore
12.20
自引率
0.00%
发文量
61
审稿时长
3 months
期刊介绍: The vision for Ecological Monographs is that it should be the place for publishing integrative, synthetic papers that elaborate new directions for the field of ecology. Original Research Papers published in Ecological Monographs will continue to document complex observational, experimental, or theoretical studies that by their very integrated nature defy dissolution into shorter publications focused on a single topic or message. Reviews will be comprehensive and synthetic papers that establish new benchmarks in the field, define directions for future research, contribute to fundamental understanding of ecological principles, and derive principles for ecological management in its broadest sense (including, but not limited to: conservation, mitigation, restoration, and pro-active protection of the environment). Reviews should reflect the full development of a topic and encompass relevant natural history, observational and experimental data, analyses, models, and theory. Reviews published in Ecological Monographs should further blur the boundaries between “basic” and “applied” ecology. Concepts and Synthesis papers will conceptually advance the field of ecology. These papers are expected to go well beyond works being reviewed and include discussion of new directions, new syntheses, and resolutions of old questions. In this world of rapid scientific advancement and never-ending environmental change, there needs to be room for the thoughtful integration of scientific ideas, data, and concepts that feeds the mind and guides the development of the maturing science of ecology. Ecological Monographs provides that room, with an expansive view to a sustainable future.
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