期刊
EVOLUTION
卷 74, 期 3, 页码 573-586出版社
OXFORD UNIV PRESS
DOI: 10.1111/evo.13921
关键词
Artificial selection; density regulation; eco-evolutionary feedback; experimental evolution; microcosm
资金
- URPP Evolution in Action
- Swiss National Science Foundation [PP00P3 179089, 31003A 172887]
- European Research Council [739874]
Abiotic stress is a major force of selection that organisms are constantly facing. While the evolutionary effects of various stressors have been broadly studied, it is only more recently that the relevance of interactions between evolution and underlying ecological conditions, that is, eco-evolutionary feedbacks, have been highlighted. Here, we experimentally investigated how populations adapt to pH-stress under high population densities. Using the protist species Tetrahymena thermophila, we studied how four different genotypes evolved in response to stressfully low pH conditions and high population densities. We found that genotypes underwent evolutionary changes, some shifting up and others shifting down their intrinsic rates of increase (r(0)). Overall, evolution at low pH led to the convergence of r(0) and intraspecific competitive ability (alpha) across the four genotypes. Given the strong correlation between r(0) and alpha, we argue that this convergence was a consequence of selection for increased density-dependent fitness at low pH under the experienced high density conditions. Increased density-dependent fitness was either attained through increase in r(0), or decrease of alpha, depending on the genetic background. In conclusion, we show that demography can influence the direction of evolution under abiotic stress.
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