DISPERSAL PROPENSITY IN TETRAHYMENA THERMOPHILA CILIATES—A REACTION NORM PERSPECTIVE
DISPERSAL PROPENSITY IN TETRAHYMENA THERMOPHILA CILIATES—A REACTION NORM PERSPECTIVE
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嗜热四膜虫纤毛虫的扩散倾向——反应规范的视角
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
N. Schtickzelle
中科院分区：
文献类型：
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作者：
Frank Pennekamp;K. A. Mitchell;A. Chaine;N. Schtickzelle
扩散和表型可塑性是物种应对环境快速变化的两种主要方式。因此，了解基因型 (G)、环境 (E) 及其相互作用（基因型和环境；G × E）如何影响扩散倾向，有助于预测全球变化下物种的生态和进化反应。在这里，我们使用活跃分散的纤毛虫来量化 G、E 和 G × E 对分散倾向的贡献，将 44 种不同的基因型暴露于三种不同的环境背景（同基因型种群的密度）。此外，我们评估了扩散的条件依赖性，即扩散是否与形态、生理或行为特征相关。我们发现基因型在扩散倾向上表现出显着差异，并且扩散可塑性地根据密度进行调整，基因型的总体趋势表现出负密度依赖性扩散。一个小但显着的 G × E 相互作用表明可塑性的遗传变异性，因此表明了分散可塑性进化的一些潜力。我们还提供了与条件依赖性扩散一致的证据，表明基因型在不同环境背景下个体条件与扩散的关系方面也有所不同，从而仅由于三个变量（基因、环境和个体条件）而产生复杂的扩散行为。
Dispersal and phenotypic plasticity are two main ways for species to deal with rapid changes of their environments. Understanding how genotypes (G), environments (E), and their interaction (genotype and environment; G × E) each affects dispersal propensity is therefore instrumental for predicting the ecological and evolutionary responses of species under global change. Here we used an actively dispersing ciliate to quantify the contributions of G, E, and G × E on dispersal propensity, exposing 44 different genotypes to three different environmental contexts (densities in isogenotype populations). Moreover, we assessed the condition dependence of dispersal, that is, whether dispersal is related to morphological, physiological, or behavioral traits. We found that genotypes showed marked differences in dispersal propensity and that dispersal is plastically adjusted to density, with the overall trend for genotypes to exhibit negative density‐dependent dispersal. A small, but significant G × E interaction indicates genetic variability in plasticity and therefore some potential for dispersal plasticity to evolve. We also show evidence consistent with condition‐dependent dispersal suggesting that genotypes also vary in how individual condition is linked to dispersal under different environmental contexts thereby generating complex dispersal behavior due to only three variables (genes, environment, and individual condition).
影响因子：
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作者：
Cassidy-Hanley, Donna M.
通讯作者：
Cassidy-Hanley, Donna M.