Delayed Germination of Seeds: A Look at the Effects of Adult Longevity, the Timing of Reproduction, and Population Age/Stage Structure
Delayed Germination of Seeds: A Look at the Effects of Adult Longevity, the Timing of Reproduction, and Population Age/Stage Structure
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DOI：
10.1086/285660
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发表时间：
1994-07
期刊：
影响因子：
--
通讯作者：
M. Rees
中科院分区：
文献类型：
--
作者：
M. Rees
在恒定和可变环境模型下，探讨了成虫寿命、繁殖时间和种群年龄/阶段结构对种子休眠演化的影响。在恒定环境模型中，完全发芽是进化稳定策略（ESS），与成虫寿命无关。将繁殖成本与随后的生存相结合并不能改变这一结果。相反，在可变环境中，成虫寿命的变化会对种子休眠施加强大的选择压力。将繁殖成本纳入到蚁种中，会减少成虫的寿命，从而选择更多的种子休眠。ESS萌发概率变化的大小取决于几个因素，包括哪个生活史阶段是可变的（如繁殖力，幼苗存活率），种子是否能探测到有利的建立地点，以及种群的年龄/阶段结构。一般来说，成虫寿命的增加对种子休眠有影响，但也讨论了这种模式的例外情况。J. P. Grime的竞争-压力-总体模型认为，已建立的植物性状与再生阶段的性状不耦合，这一观点被认为是批判性的。
The effects of adult longevity, the timing of reproduction, and population age/stage structure on the evolution of seed dormancy are explored in both constant and variable environment models. In the constant environment models complete germination is the evolutionarily stable strategy (ESS) regardless of adult longevity. Incorporating a cost of reproduction on subsequent survival does not alter this result. In contrast, in a variable environment changes in adult longevity can exert a strong selection pressure against seed dormancy. Incorporating a cost of reproduction for iteroparous species reduces adult longevity, which selects for more seed dormancy. The magnitude of the change in ESS germination probability depends on several factors, including which life-history stage is variable (e.g., fecundity, seedling survival), whether seeds can detect favorable sites for establishment, and the age/stage structure of the population. In general, increases in adult longevity select against seed dormancy, but exceptions to this pattern are discussed. The idea that established plant traits are uncoupled from those of the regenerative phase, as assumed by J. P. Grime's competition-stress-ruderal model, is considered critically.