Number and weight of seeds and reproductive strategies of herbaceous plants
Number and weight of seeds and reproductive strategies of herbaceous plants
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DOI：
10.1007/bf02803262
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发表时间：
2004-03
影响因子：
1.2
通讯作者：
B. Šerá;M. Serý
中科院分区：
文献类型：
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作者：
B. Šerá;M. Serý
论文带来了中欧约500种野生草本植物的种子繁殖数据集，并以新的方式展示了一些生产的种子。种子数量——种群的繁殖能力（RCP）被定义为一个物种在一个季节100%覆盖率下每1平方米产生的种子数量。大约 23% 的种子重量变异性和大约 26% 的 RCP 变异性可以在科水平上得到解释。 RCP 和种子重量之间的权衡在家庭内部和家庭之间都得到了证实。这两个特征在科水平和较低分类水平上比在亚类和类水平上具有更高的变异性。具有一年生命周期的物种比多年生植物有更多的种子。与其他生命形式和具有营养性横向传播的物种相比，没有横向传播的土生植物和物种倾向于产生大量相对重的种子。种子靠风传播的物种通常有大量轻质种子。多变量分析证实了生殖特征的一些趋势，这些趋势与 Grime 对 C、S、R 策略的定义相对应——RCP 作为生态特征的“验证”。 R-策略在繁殖特征上与C-和S-策略有很好的区别，而C-和S-策略彼此非常相似。具有昆虫授粉剂的物种通常对应于C-策略，风媒剂对应于S-策略，具有自花授粉剂的物种对应于R-策略。
The paper brings data set of seed reproduction of about 500 wild herbaceous species of Central Europe and presents a number of produced seeds in a new way. Number of seeds — reproductive capacity of a population (RCP) was defined as a number of seeds produced by one species per 1 m2at its one-hundred-per-cent cover per one season. About 23% of seed weight variability and about 26% of variability in RCP were explainable on a family level. The trade-off between RCP and seed weight was confirmed both within families and also among families. Both characteristics had higher variability on a family level and on lower taxonomic levels than on subclass and class levels. Species with an annual life cycle have a larger number of seeds than perennials. Geophytes and species without lateral spread have a tendency to produce a large amount of relatively weighty seeds in comparison to other life forms, and to species with vegetative lateral spread. Species with seeds dispersed by wind usually have a large number of lightweight seeds. Multivariate analyses confirmed some tendencies of reproductive traits which correspond to the definition of C-, S-, R- strategies by Grime — “verification” of the RCP as ecological trait. The R- strategy was well distinguished from the C- and S- strategies by reproductive traits, whereas C- and S- strategies are very similar to each other. Species with insect pollination agent often correspond to C- strategy, wind agent to S- strategy, and species with self-pollination to R- strategy.