Thermal plasticity has higher fitness costs among thermally tolerant genotypes of Tigriopus californicus

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY Functional Ecology Pub Date : 2024-05-02 DOI:10.1111/1365-2435.14568

Samuel N. Bogan, Olivia I. Porat, Michael J. Meneses, Gretchen E. Hofmann

引用次数: 0

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耐热基因型的热可塑性会增加加州褐虎的适应成本

在气候变化的情况下，外温动物可能会面临通过提高其上限热耐受性及其可塑性（一种热适应措施）来适应新的热环境的压力。热耐受性高的外温动物种群通常热可塑性较低，这种权衡假设是由于：（i）热耐受性的表型限制，超过这一限制，可塑性就无法进一步提高该性状；（ii）遗传负相关；或（iii）两种性状之间的适应性权衡。每种假设是否会导致热耐受性与可塑性之间的负相关，都会对每种性状的进化产生影响。我们利用潮间带桡足类 Tigriopus californicus 的实验可操作性和热生物学特性，对极限假说和权衡假说进行了实证检验。利用加利福尼亚沿海四个纬度分布地点的种群，每个种群有六个品系，在实验室公共花园中饲养了两代。第三代的 96 个全同胞重复（n = 每个品系 4-5 个）在 21.5 和 16.5°C 的温度条件下发育，直至成年。然后，我们测量了同胞在每个温度下的上限耐热性和繁殖力。我们发现，在基线热耐受性和其可塑性之间，繁殖力（一种适应性的必然结果）存在明显的权衡。耐热性较高的加州褐虎种群和基因型的热可塑性较低。我们发现，在环境温度下，对热可塑性的负定向选择表现为繁殖力降低。在耐热基因型中，可塑性的适应成本明显更高，这与权衡假说一致。这种权衡在环境条件下很明显，但在高温条件下并不明显。同时包含极限假说和权衡假说的模型，而不是只包含一种假说参数的模型，最能解释所观察到的热可塑性和繁殖力。种群和家系对耐受性和可塑性的影响呈负协方差，这表明不能排除遗传负相关是导致性状之间负相关的原因。我们的研究利用强推理方法，对适应性权衡假说进行了新颖的实证检验。我们讨论了我们的研究结果对热适应如何可能受到生理限制、遗传相关性以及热耐受性及其可塑性之间的适应性权衡的启示。在期刊博客上免费阅读本文的通俗摘要。

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来源期刊

Functional Ecology 环境科学-生态学

CiteScore

9.00

自引率

1.90%

发文量

243

审稿时长

4 months

期刊介绍： Functional Ecology publishes high-impact papers that enable a mechanistic understanding of ecological pattern and process from the organismic to the ecosystem scale. Because of the multifaceted nature of this challenge, papers can be based on a wide range of approaches. Thus, manuscripts may vary from physiological, genetics, life-history, and behavioural perspectives for organismal studies to community and biogeochemical studies when the goal is to understand ecosystem and larger scale ecological phenomena. We believe that the diverse nature of our journal is a strength, not a weakness, and we are open-minded about the variety of data, research approaches and types of studies that we publish. Certain key areas will continue to be emphasized: studies that integrate genomics with ecology, studies that examine how key aspects of physiology (e.g., stress) impact the ecology of animals and plants, or vice versa, and how evolution shapes interactions among function and ecological traits. Ecology has increasingly moved towards the realization that organismal traits and activities are vital for understanding community dynamics and ecosystem processes, particularly in response to the rapid global changes occurring in earth’s environment, and Functional Ecology aims to publish such integrative papers.