Trade-off between seed dispersal in space and time.,Ecology Letters

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Trade-off between seed dispersal in space and time.
Ecology Letters ( IF 7.6 ) Pub Date : 2020-09-02 , DOI: 10.1111/ele.13595
Si-Chong Chen ₁ , Peter Poschlod ₂ , Alexandre Antonelli _{3,

4} , Udayangani Liu ₁ , John B Dickie ₁

Affiliation

Seed movement and delayed germination have long been thought to represent alternative risk‐spreading strategies, but current evidence covers limited scales and yields mixed results. Here we present the first global‐scale test of a negative correlation between dispersal and dormancy. The result demonstrates a strong and consistent pattern that species with dormant seeds have reduced spatial dispersal, also in the context of life‐history traits such as seed mass and plant lifespan. Long‐lived species are more likely to have large, non‐dormant seeds that are dispersed far. Our findings provide robust support for the theoretical prediction of a dispersal trade‐off between space and time, implying that a joint consideration of risk‐spreading strategies is imperative in studying plant life‐history evolution. The bet‐hedging patterns in the dispersal–dormancy correlation and the associated reproductive traits have implications for biodiversity conservation, via prediction of which plant groups would be most impacted in the changing era.

中文翻译：

种子传播在空间和时间上的权衡。

长期以来，人们一直认为种子移动和延迟发芽代表了替代风险传播策略，但目前的证据涵盖的规模有限，结果喜忧参半。在这里，我们提出了第一个全球规模的扩散和休眠之间负相关的测试。结果表明，在种子质量和植物寿命等生命史特征的背景下，具有休眠种子的物种减少了空间扩散。长寿的物种更有可能拥有散布得很远的大型非休眠种子。我们的研究结果为空间和时间之间分散权衡的理论预测提供了强有力的支持，这意味着在研究植物生命史进化时，必须联合考虑风险分散策略。

更新日期：2020-10-19

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