Thermal performance curves of Paramecium caudatum: A model selection approach
Thermal performance curves of Paramecium caudatum: A model selection approach
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DOI：
10.1016/j.ejop.2010.12.001
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发表时间：
2011-05-01
影响因子：
2.9
通讯作者：
Petzoldt, Thomas
中科院分区：
文献类型：
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作者：
Krenek, Sascha;Berendonk, Thomas U.;Petzoldt, Thomas
持续的气候变化促使许多研究调查各种生物，特别是外温动物的温度反应。为了正确描述这些生物体的热性能，需要充分拟合完整的最佳曲线的函数。令人惊讶的是，一个重要的变温组，原生动物的人口增长率的温度依赖性的模型比较，仍然失踪。本文研究了淡水原生生物尾草履虫（Paramecium caudatum）自然分离物在几乎整个温度范围内的温度反应规范。这些反应规范被用来估计热性能曲线，通过应用一组常用的模型函数。信息理论的方法被用来比较模型，并确定最好的描述这些数据。结果表明，能描述最佳曲线高、低温分支负增长的模型是较好的。这是准确计算临界热上限和下限的先决条件。虽然我们检测到所有研究的克隆菌株的最佳温度约为29摄氏度，但各个克隆之间的临界热极限有很大差异。在这里，热带克隆表现出最强的耐热性，其临界温度极限向更高温度移动。(C)2010年Elsevier GmbH。All rights reserved.
The ongoing climate change has motivated numerous studies investigating the temperature response of various organisms, especially that of ectotherms. To correctly describe the thermal performance of these organisms, functions are needed which sufficiently fit to the complete optimum curve. Surprisingly, model-comparisons for the temperature-dependence of population growth rates of an important ectothermic group, the protozoa, are still missing. In this study, temperature reaction norms of natural isolates of the freshwater protist Paramecium caudatum were investigated, considering nearly the entire temperature range. These reaction norms were used to estimate thermal performance curves by applying a set of commonly used model functions. An information theory approach was used to compare models and to identify the best ones for describing these data. Our results indicate that the models which can describe negative growth at the high- and low-temperature branch of an optimum curve are preferable. This is a prerequisite for accurately calculating the critical upper and lower thermal limits. While we detected a temperature optimum of around 29 degrees C for all investigated clonal strains, the critical thermal limits were considerably different between individual clones. Here, the tropical clone showed the narrowest thermal tolerance, with a shift of its critical thermal limits to higher temperatures. (C) 2010 Elsevier GmbH. All rights reserved.