Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland.
J Evol Biol. 2023 Jun;36(6):945-949. doi: 10.1111/jeb.14178. Epub 2023 May 2.
Variation is the raw material for evolution. Evolutionary potential is determined by the amount of genetic variation, but evolution can also alter the visibility of genetic variation to natural selection. Fluctuating environments are suggested to maintain genetic variation but they can also affect environmental variance, and thus, the visibility of genetic variation to natural selection. However, experimental studies testing these ideas are relatively scarce. In order to determine differences in evolutionary potential we quantified variance attributable to population, genotype and environment for populations of the bacterium Serratia marcescens. These populations had been experimentally evolved in constant and two fluctuating environments. We found that strains that evolved in fluctuating environments exhibited larger environmental variation suggesting that adaptation to fluctuations has decreased the visibility of genetic variation to selection.
变异是进化的原材料。进化潜力取决于遗传变异的数量，但进化也可以改变遗传变异对自然选择的可见性。波动的环境被认为可以维持遗传变异，但它们也会影响环境方差，从而影响遗传变异对自然选择的可见性。然而，验证这些观点的实验研究相对较少。为了确定进化潜力的差异，我们量化了细菌粘质沙雷氏菌种群的种群、基因型和环境归因方差。这些种群在恒定和两种波动环境中进行了实验进化。我们发现，在波动环境中进化的菌株表现出更大的环境变异性，这表明对波动的适应降低了遗传变异对选择的可见性。
