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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Intraspecific functional trait variability does not result in higher fitness under thermal stress in a free-living marine nematode
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Intraspecific functional trait variability does not result in higher fitness under thermal stress in a free-living marine nematode

机译：种内功能性状变异性不会导致自由生存的海洋线虫在热胁迫下的适应性更高

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摘要

Climate change has an impact on all levels of biodiversity: genes, species, populations and ecosystems. This effect is expected to be dependent on the rate of change. When faced with unfavorable environmental conditions, individuals have three non-exclusive options by which they can mitigate these changes: temporal alterations in phenology, spatial tracking of optimal conditions or in situ adaptation. For the latter to occur requires the existence of variability among conspecifics with respect to traits that directly or indirectly influence individual performance and fitness. One such "functional" trait is thermal stress tolerance. We investigated the presence of intraspecific functional trait variability of isofemale lineages of the free-living marine nematode Litoditis marina in monoculture, double and quadruple mixtures under thermal stress, which was applied in a gradient and a sudden treatment over 20 days, corresponding to at least four generations. We found a high degree of intraspecific functional trait variability relevant to thermal tolerance. This type of variability has traditionally been considered negligible compared to interspecific variation, but our results demonstrate the importance of its inclusion within trait-based eco-evolutionary studies as this will confer increased accuracy when inputting physiological parameters to relevant models (e.g. species distribution models). Additionally, we found a significant effect of the temperature treatments. In accordance with the majority of experimental evidence, our populations showed a stronger response to a sudden versus a gradient increase in temperature. Contrary to our expectations, no significant differences were observed between monocultures, double and quadruple lineage mixtures suggesting that increased intraspecific trait variability did not lead to higher fitness in L. marina populations exposed to thermal stress. (C) 2015 Elsevier B.V. All rights reserved.
机译：气候变化对生物多样性的各个层面都有影响，包括基因，物种，种群和生态系统。预期这种效果取决于变化率。当面对不利的环境条件时，个人可以通过三种非排他性的选择来缓解这些变化：物候的时间变化，最佳条件的空间跟踪或原位适应。要使后者发生，就直接或间接影响个体表现和适应性的性状而言，在种间存在变异性。一种这样的“功能”特性是热应力耐受性。我们调查了在热应激下，单活，双重和四重混合物在自由胁迫下，自由活动的海洋线虫线粒体滨海同种雌性谱系的种内功能性状变异性的存在，将其梯度施用并在20天后进行突然处理，至少相当于四代。我们发现高度的种内功能性状变异性与热耐受性有关。与种间变异相比，传统上认为这种变异性可以忽略不计，但是我们的结果证明了将其包含在基于特征的生态进化研究中的重要性，因为当将生理参数输入相关模型（例如物种分布模型）时，这将提高准确性。另外，我们发现了温度处理的显着效果。根据大多数实验证据，我们的人群对温度的突然升高和梯度升高表现出更强的响应。与我们的预期相反，单培养，双谱系和四谱系混合物之间没有观察到显着差异，表明种内性状变异性的增加并未导致暴露于热应激的滨海乳杆菌种群具有更高的适应性。 （C）2015 Elsevier B.V.保留所有权利。

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