期刊
ECOLOGY LETTERS
卷 19, 期 10, 页码 1209-1218出版社
WILEY-BLACKWELL
DOI: 10.1111/ele.12655
关键词
Bet hedging; density dependence; desert annuals; dormancy; evolutionarily stable strategies; integrated strategies; population dynamic models; predictive plasticity; seed bank; within-year germination
类别
资金
- NSF [DEB-9107324, DEB-9419905, DEB-0212782, DEB-0717466, DEB-0817121, DEB-1256792, DEB-0844780]
- Division Of Environmental Biology
- Direct For Biological Sciences [1256792] Funding Source: National Science Foundation
In variable environments, organisms must have strategies to ensure fitness as conditions change. For plants, germination can time emergence with favourable conditions for later growth and reproduction (predictive germination), spread the risk of unfavourable conditions (bet hedging) or both (integrated strategies). Here we explored the adaptive value of within-and among-year germination timing for 12 species of Sonoran Desert winter annual plants. We parameterised models with long-term demographic data to predict optimal germination fractions and compared them to observed germination. At both temporal scales we found that bet hedging is beneficial and that predicted optimal strategies corresponded well with observed germination. We also found substantial fitness benefits to varying germination timing, suggesting some degree of predictive germination in nature. However, predictive germination was imperfect, calling for some degree of bet hedging. Together, our results suggest that desert winter annuals have integrated strategies combining both predictive plasticity and bet hedging.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据