Fitness patterns and phenotypic plasticity in a spatially heterogeneous environment.
Fitness patterns and phenotypic plasticity in a spatially heterogeneous environment.
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空间异质环境中的健身模式和表型可塑性。
DOI：
10.1017/s0016672300034212
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Bergman,A
中科院分区：
文献类型：
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作者：
Zhivotovsky,LA;Feldman,MW;Bergman,A
我们分析了在随机交配的单倍体种群中不同生态位的基因型适应度的均值和方差的模式。种群处于空间异质性环境中，受突变和弱多位点加性选择的影响，不同生态位的选择系数不同。根据环境和遗传参数，导出了生态位间基因型适应度的平稳均值和方差的近似解析表达式。作为一个特例，我们分析了一个由变量t描述的环境，该环境分布在均值为t*，方差为D*的生态位之间，环境之间的相关性作为t值差的函数呈二次递减。如果生态位具有相同的质量，则基因型适应度的均值和方差演变为t的二次函数，分别在t*达到最大值和最小值。对于不相等的生态位质量，这些是非多项式函数，它们在不同的，通常是中间值t处达到极值，尽管基因型适应度的变异系数仍然在t*附近达到最小值。这些函数包括总突变率、基因座对基因型适应度的贡献以及生态位的频率和质量分布。因此，对于这个相对简单的模型，反应的规范可以根据环境异质性和遗传系统的详细特性来计算。
We analyse patterns of the means and variances of genotypic fitnesses across different niches in a randomly mating haploid population. The population inhabits a spatially heterogeneous environment where it is subject to mutation and weak multilocus additive selection, with different selection coefficients in different niches. Approximate analytical expressions are derived for the stationary mean and variance of genotypic fitnesses among the niches in terms of environmental and genetic parameters. As a special case, we analyse an environment described by a variable t, distributed among the niches with mean t* and variance D*, and quadratic decrease in correlation between environments as a function of the difference in values of t. If the niches have the same qualities, the mean and variance of genotypic fitnesses evolve to be quadratic functions of t that achieve their maximum and minimum, respectively, at t*. With unequal niche qualities, these are non-polynomial functions that attain their extrema at different, usually intermediate values of t, although the coefficient of variation of the genotypic fitnesses still attains its minimum near t*. The functions involve the total mutation rate, the contribution of the loci to genotypic fitnesses, and the frequency and quality distributions of the niches. Thus, for this relatively simple model the norms of reaction may be calculated in terms of the detailed properties of the environmental heterogeneity, and the genetic system.