Why So Variable: Can Genetic Variance in Flowering Thresholds Be Maintained by Fluctuating Selection?

Why So Variable: Can Genetic Variance in Flowering Thresholds Be Maintained by Fluctuating Selection?
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为什么如此多变:开花阈值的遗传变异可以通过波动选择来维持吗?

DOI:
10.1086/703436
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发表时间:
2019
期刊:
The American naturalist
影响因子:
--
通讯作者:
Rees M
Rees M
中科院分区:
--
文献类型:
--
作者:
Rees M

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We use integral projection models (IPMs) and individual-based simulations to study the evolution of genetic variance in two monocarpic plant systems. Previous approaches combining IPMs with an adaptive dynamics–style invasion analysis predicted that genetic variability in the size threshold for flowering will not be maintained, which conflicts with empirical evidence. We ask whether this discrepancy can be resolved by making more realistic assumptions about the underlying genetic architecture, assuming a multilocus quantitative trait in an outcrossing diploid species. To do this, we embed the infinitesimal model of quantitative genetics into an IPM for a size-structured cosexual plant species. The resulting IPM describes the joint dynamics of individual size and breeding value of the evolving trait. We apply this general framework to the monocarpic perennialsOenothera glaziovianaandCarlina vulgaris. The evolution of heritable variation in threshold size is explored in both individual-based models (IBMs) and IPMs, using a mutation rate modifier approach. In theOenotheramodel, where the environment is constant, there is selection against producing genetically variable offspring. In theCarlinamodel, where the environment varies between years, genetically variable offspring provide a selective advantage, allowing the maintenance of genetic variability. The contrasting predictions of adaptive dynamics and quantitative genetics models for the same system suggest that fluctuating selection may be more effective at maintaining genetic variation than previously thought.
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