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Maternal effect on seed survival and emergence in Cytisus scoparius: an experimental approach

机译：母体对鼠尾草种子存活和出苗的影响：一种实验方法

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摘要

The role of the individual origin of seeds in the variability of demographic parameters within a seed-bank has been little studied despite the recognition of its important contribution to species adaptation strategies to environmental constraints. This study analyzed the seed-bank dynamics of Cytisus scoparius, a small woody species with a high aptitude for colonization and dominance. Our experimental setup made it possible to monitor seed emergence dynamics in situ for maternal individuals within the study population. In addition to the characteristic traits of the species (maximum seed life span between 4 and 5 years in 75 % of the cases), there was a high variability of the emergence dynamics between individuals, distinguished both by their total emergence rate and profile. The total emergence rate of seeds was correlated with their quality (seed weight and number of seeds per pod), but was unrelated to either maternal age or fecundity. Different emergence profiles can be recognized between two distinct patterns: on one hand, a strategy that concentrates on emergence in the second year and, on the other, a regular decrease of the germinant number over time. The coexistence of different seed-bank strategies between individuals results in the ability for the population to face to disturbances and environmental variability.
机译：尽管人们认识到种子对物种适应策略对环境制约的重要贡献，但种子个体在种子库内人口参数变化中的作用却鲜有研究。这项研究分析了Cytisus scoparius的种子库动态，Cytisus scoparius是一种小型木本物种，具有很高的定殖和优势地位。我们的实验设置使在研究人群中监测母体个体的种子出苗动态成为可能。除了该物种的特征性特征（75％的情况下，最长种子寿命为4至5年）外，个体之间的出苗动态也存在很大差异，这以其总出苗率和轮廓来区分。种子的总出苗率与其质量（种子重量和每荚的种子数量）相关，但与产妇年龄或繁殖力无关。在两种不同的模式之间可以识别出不同的出苗情况：一方面，一种策略专注于第二年的出苗，另一方面，随着时间的推移，发芽菌数量会定期减少。个体之间不同种子库策略的共存会导致种群面对干扰和环境变化的能力。

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