期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 36, 期 6, 页码 945-949出版社
WILEY
DOI: 10.1111/jeb.14178
关键词
bet-hedging; experimental evolution; fluctuating environments; genetic variation
This study investigated the differences in evolutionary potential of the bacterium Serratia marcescens in constant and fluctuating environments. The results showed that strains that evolved in fluctuating environments exhibited larger environmental variation, indicating that adaptation to fluctuations has decreased the visibility of genetic variation to natural selection.
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.
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