Does thermoregulatory behavior maximize reproductive fitness of natural isolates of Caenorhabditis elegans?
Does thermoregulatory behavior maximize reproductive fitness of natural isolates of Caenorhabditis elegans?
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DOI：
10.1186/1471-2148-11-157
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发表时间：
2011-06-06
影响因子：
3.4
通讯作者：
Phillips, Patrick C.
中科院分区：
文献类型：
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作者：
Anderson, Jennifer L.;Albergotti, Lori;Phillips, Patrick C.
背景：生理生态学的一个中心前提是动物的首选体温应该与温度最大化性能和达尔文适应度密切相关。由于几个原因，验证这种共同适应假设一直存在问题。首先，生殖适应性是适当的衡量标准，但在大多数动物中很难衡量。其次，没有一种健康指标适用于所有的人口状况，这使解释变得复杂。在这里，我们通过研究秀丽隐杆线虫（Caenorhabditis elegans）来验证共同适应假说，在这种生物中，适合度和热偏好都可以可靠地测量。结果：我们发现秀丽隐杆线虫的天然分离株表现出一系列的平均热偏好，并且它们的适应性热敏感性也有所不同。热寻求菌株CB4854和CB4857偏好有利于种群增长率(r)的温度，而冷寻求菌株CB4856偏好有利于终生生殖成功率（LRS）的温度。结论：秀丽隐杆线虫天然分离株的适合度与热偏好之间的相关性主要由分离株的热偏好差异驱动。如果这些差异是自然选择的结果，那么这就表明，在进化生态学研究中使用的合适的适应度衡量标准即使在物种内部也可能有所不同，这取决于每个种群独特的生态和进化历史。
Background: A central premise of physiological ecology is that an animal's preferred body temperature should correspond closely with the temperature maximizing performance and Darwinian fitness. Testing this co-adaptational hypothesis has been problematic for several reasons. First, reproductive fitness is the appropriate measure, but is difficult to measure in most animals. Second, no single fitness measure applies to all demographic situations, complicating interpretations. Here we test the co-adaptation hypothesis by studying an organism (Caenorhabditis elegans) in which both fitness and thermal preference can be reliably measured.Results: We find that natural isolates of C. elegans display a range of mean thermal preferences and also vary in their thermal sensitivities for fitness. Hot-seeking isolates CB4854 and CB4857 prefer temperatures that favor population growth rate (r), whereas the cold-seeking isolate CB4856 prefers temperatures that favor Lifetime Reproductive Success (LRS).Conclusions: Correlations between fitness and thermal preference in natural isolates of C. elegans are driven primarily by isolate-specific differences in thermal preference. If these differences are the result of natural selection, then this suggests that the appropriate measure of fitness for use in evolutionary ecology studies might differ even within species, depending on the unique ecological and evolutionary history of each population.