FITNESS VARIATION AND LOCAL DISTRIBUTION LIMITS IN AN ANNUAL PLANT POPULATION
FITNESS VARIATION AND LOCAL DISTRIBUTION LIMITS IN AN ANNUAL PLANT POPULATION
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DOI：
10.1111/j.1558-5646.2010.01183.x
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发表时间：
2011-04-01
期刊：
影响因子：
3.3
通讯作者：
Stanton, Maureen L.
中科院分区：
文献类型：
--
作者：
Emery, Nancy C.;Rice, Kevin J.;Stanton, Maureen L.
了解遗传变异如何塑造物种的分布涉及到研究变异如何在物种范围内分布，以及它如何对潜在的环境异质性做出反应。我们研究了适合度变化的模式，在本地分布的一年复合（Lasthenia fremontii）跨越小规模的淹没梯度在加州春池湿地。利用从种群中心和边缘收集的种子，产生父系半同胞家系，并将其移植回原始种群的中心和边缘。所有移植都适应了人群中心的条件。环境对选择机会的影响取决于假设的选择模型。在硬选择的模型下，绝对适合度的方差在群体边缘的移植物之间比在中心的移植物之间低。在软选择模型下，中心和边缘小生境之间的相对适合度方差相似。考虑到这个种群可能是混合的，中心和边缘微生境之间的栖息地质量差异可能会导致种群中心的选择主导这个种群的进化轨迹。
Understanding how genetic variation shapes species' distributions involves examining how variation is distributed across a species' range as well as how it responds to underlying environmental heterogeneity. We examined patterns of fitness variation across the local distribution of an annual composite (Lasthenia fremontii) spanning a small-scale inundation gradient in a California vernal pool wetland. Using seeds collected from the center and edge of a population, paternal half-sib families were generated and transplanted back to the center and edge of the original population. All transplants were adapted to the conditions at the center of the population. The effect of the environment on the opportunity for selection depended on the model of selection assumed. Under a model of hard selection, variance in absolute fitness was lower among transplants at the edge of the population than at the center. Under a model of soft selection, the variance in relative fitness was similar between center and edge microhabitats. Given that this population is likely well-mixed, differences in habitat quality between center and edge microhabitats will likely cause selection at the center of the population to dominate the evolutionary trajectory of this population.