Dissecting components of population-level variation in seed production and the evolution of masting behavior
Dissecting components of population-level variation in seed production and the evolution of masting behavior
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DOI：
10.1034/j.1600-0706.2003.12272.x
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发表时间：
2003-09-01
期刊：
影响因子：
3.4
通讯作者：
Westfall, RD
中科院分区：
文献类型：
--
作者：
Koenig, WD;Kelly, D;Westfall, RD
肥大结实或肥大行为是种群内个体生殖模式的累积结果，因此涉及个体变异、个体间同步和时间自相关的内源性周期的组成部分。扩展了Herrera之前的工作，我们使用来自24个物种的59个植物种群的个体种子产量数据来探索这些组成部分的相互关系，这些物种的年度变化范围很大，从表现出强桅杆的物种到其他年度变化很小的物种。种子产量。当基于未转化的种子产量值时，群体和个体变异性的估计值不受样本量或平均总种子产量的影响，但这些值随着对数转化的种子产量的增加而下降。群体变异性与个体变异性的相关性（r = 0.86）比个体同步性（r = 0.73）更强。这后两个组成部分也显着相关（r = 0.45），但随机化证实，他们不需要协变密切。因此，选择可以单独作用于年际变异和个体间同步。我们通过讨论几个例子，并通过展示与其生活史相关的物种之间种子生产的种群水平变化的组成部分的显着差异，说明了这种微调选择对种子生产模式的潜力。
Mast-fruiting or masting behavior is the cumulative result of the reproductive patterns of individuals within a population and thus involves components of individual variability, between-individual synchrony, and endogenous cycles of temporal autocorrelation. Extending prior work by Herrera, we explore the interrelationships of these components using data on individual seed production in 59 populations of plants from 24 species spanning a large range of annual variability, from species exhibiting strong masting to others with little annual variability in seed production. Estimates of population and individual variability were not biased by sample size or average overall seed production when based on untransformed seed production values, but these values declined as log-transformed seed production increased. Population variability was more strongly correlated with individual variability (r = 0.86) than individual synchrony (r = 0.73). These latter two components were also significantly correlated (r = 0.45), but randomizations confirm that they need not covary closely. Thus, selection can act separately on inter-annual variability and between-individual synchrony. We illustrate the potential for such fine-tuned selection on seed production patterns by discussing several examples and by demonstrating significant differences in components of population-level variation in seed production among species related to their life-history.