Phytoplankton thermal responses adapt in the absence of hard thermodynamic constraints
Phytoplankton thermal responses adapt in the absence of hard thermodynamic constraints
复制标题
浮游植物的热响应在没有严格的热力学约束的情况下进行适应
DOI:
10.1101/452250
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Kontopoulos D
中科院分区:
文献类型:
--
作者:
Kontopoulos D
To better predict how populations and communities respond to climatic temperature variation, it is necessary to understand how the shape of the response of fitness-related rates to temperature evolves (the thermal performance curve). Currently, there is disagreement about the extent to which the evolution of thermal performance curves is constrained. One school of thought has argued for the prevalence of thermodynamic constraints through enzyme kinetics, whereas another argues that adaptation can—at least partly—overcome such constraints. To shed further light on this debate, we perform a phylogenetic meta-analysis of the thermal performance curves of growth rate of phytoplankton—a globally important functional group—controlling for environmental effects (habitat type and thermal regime). We find that thermodynamic constraints have a minor influence on the shape of the curve. In particular, we detect a very weak increase of maximum performance with the temperature at which the curve peaks, suggesting a weak “hotter-is-better” constraint. Also, instead of a constant thermal sensitivity of growth across species, as might be expected from strong constraints, we find that all aspects of the thermal performance curve evolve along the phylogeny. Our results suggest that phytoplankton thermal performance curves adapt to thermal environments largely in the absence of hard thermodynamic constraints.
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发表时间:
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期刊:
The Journal of animal ecology
影响因子:
--
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