The relationship between seed size and abundance in plant communities: model predictions and observed patterns
The relationship between seed size and abundance in plant communities: model predictions and observed patterns
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DOI：
10.1034/j.1600-0706.2001.10392.x
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发表时间：
2001-07-01
期刊：
影响因子：
3.4
通讯作者：
Murray, BR
中科院分区：
文献类型：
--
作者：
Leishman, MR;Murray, BR
最近的研究表明，种子的大小和植物群落的丰富度是相关的。然而.这些研究中出现了不一致的模式。我们采用了一个理论框架，提出了不同的机制来解释新兴关系。基于植被动态和物种共存的关键理论谱系，研究物种多度与种子大小之间的关系。从这些理论谱系中，我们确定了四个模型及其预测：种子大小数量权衡模型（SSNTM）。演替模型（SM）、空间竞争模型（SCM）。彩票模型（LM）然后，我们探讨了经验证据，从十个不同的植物群落的种子大小和丰富的模式。并将这些模式与模型预测相关联。SSNTM预测种子大小和丰度之间的负相关性，SM预测负相关，正相关或无相关性依赖于自干扰以来的时间。而SCM和LM没有预测种子大小和丰度之间的关系。我们没有发现证据表明十个群落的种子大小和丰度之间存在一致的关系。一年生植物为主的群落与多年生植物相比，在种子大小和丰度关系上没有一致的差异。在10个社区的三个显着的正种子大小和丰富的相关性出现。这一发现证明SSNTM是这些群落丰度结构的重要决定因素。在沿海林地。种子大小和丰度之间的关系与SM的预测一致（尽管通常不显著），其中火是干扰。我们认为，发现的种子大小和丰度的显著正相关性可能是由大种子和大生长形式之间的关联驱动的。因为大的生长形式往往占主导地位。看来群落中种子大小和丰度的模式很可能是由环境因素与植物属性之间的复杂相互作用决定的，而植物属性的相互作用决定了物种的策略。
Recent studies have suggested that seed size and plant abundance in communities are associated. However. inconsistent patterns have emerged from these studies. with varying mechanisms proposed to explain emergent relationships, We employ a theoretical framework. based on key theory lineages of vegetation dynamics and species coexistence, to examine relationships between species abundance and seed size. From these theory lineages, we identified four models and their predictions: the Seed size number trade-off model (SSNTM). the Succession model (SM), the Spatial competition model (SCM). and the Lottery model (LM). We then explored empirical evidence from ten diverse plant communities for seed size and abundance patterns. and related these patterns to model predictions. The SSNTM predicts a negative correlation between seed size and abundance, The SM predicts either a negative, positive or no correlation dependent on time since disturbance. while the SCM and LM make no predictions for a relationship between seed size and abundance. We found no evidence for consistent relationships between seed size and abundance across the ten communities. There were no consistent differences in seed size and abundance relationships between communities dominated by annuals compared to perennials. In three of the ten communities a significant positive seed size and abundance correlation emerged. which falsified the SSNTM as an important determinant of abundance structure in these communities. For sites in coastal woodland. the relationships between seed size and abundance were consistent with the predictions of the SM (although generally not significant), with fire being the disturbance. We suggest that the significant positive seed size and abundance correlations found may be driven by the association between large seeds and large growth forms., as large growth forms tend to be dominant. It seems likely that patterns of seed size and abundance in communities are determined by a complex interaction between environmental factors and correlations of plant attributes that determine a species' strategy.