Coexistence and relative abundance in plant communities are determined by feedbacks when the scale of feedback and dispersal is local.
Coexistence and relative abundance in plant communities are determined by feedbacks when the scale of feedback and dispersal is local.
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DOI：
10.1111/1365-2745.12269
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发表时间：
2014-09
期刊：
影响因子：
--
通讯作者：
Bever JD
中科院分区：
文献类型：
--
作者：
Mack KM;Bever JD
1.当某一物种的个体在某一地点的出现降低了同一物种的个体相对于该地点其他物种的相对成功时，就会发生植物-土壤负反馈。这种效应有利于异质性，从而促进共存和保持多样性。实证研究表明，这些反馈的平均强度与群落内物种的相对丰度相关，这表明反馈是植物群落组成的重要驱动力。了解什么因素有助于产生这种关系是必要的诊断动力，保持植物群落的多样性。2.我们使用了一个空间上明确的，基于个人的计算机模拟测试的影响，扩散距离，反馈邻域的大小，成对反馈的强度和社区广泛的反馈变化，社区丰富度，以及生活史差异的相对丰度的依赖反馈的强度。3.我们发现，一个物种的相对丰度的平均反馈的局部尺度扩散和反馈的正相关。然而，我们发现，这种依赖性的强度下降，无论是空间尺度的扩散和/或空间尺度的反馈增加。我们还发现，对于空间局部（即相对较小）尺度的相互作用和扩散，作为反馈在社会中的平均强度变得不那么负，更大的增加，丰富的物种特异性平均反馈的可比增加。我们发现，生活史的差异，如死亡率并没有产生丰富的模式，也没有影响丰富和平均反馈之间的关系。4.合成.我们的研究结果支持的说法，经验观察的相对丰度和强度的平均反馈之间的正相关性作为证据，当地规模的负反馈结构植物群落中发挥了突出的作用。我们还确定，这种关系取决于当地规模的植物扩散和反馈，产生丛生和放大的负反馈。
1. Negative plant-soil feedback occurs when the presence of an individual of a particular species at a particular site decreases the relative success of individuals of the same species compared to those other species at that site. This effect favors heterospecifics thereby facilitating coexistence and maintaining diversity. Empirical work has demonstrated that the average strengths of these feedbacks correlate with the relative abundance of species within a community, suggesting that feedbacks are an important driver of plant community composition. Understanding what factors contribute to the generation of this relationship is necessary for diagnosing the dynamic forces that maintain diversity in plant communities. 2. We used a spatially explicit, individual-based computer simulation to test the effects of dispersal distance, the size of feedback neighbourhoods, the strength of pairwise feedbacks and community wide variation of feedbacks, community richness, as well as life-history differences on the dependence of relative abundance on strength of feedback. 3. We found a positive dependence of relative abundance of a species on its average feedback for local scale dispersal and feedback. However, we found that the strength of this dependence decreased as either the spatial scale of dispersal and/or the spatial scale of feedback increased. We also found that for spatially local (i.e. relatively small) scale interaction and dispersal, as the mean strength of feedbacks in the community becomes less negative, the greater the increase in abundance produced by a comparable increase in species-specific average feedback. We found that life-history differences such as mortality rate did not generate a pattern with abundance, nor did they affect the relationship between abundance and average feedback. 4. Synthesis. Our results support the claim that empirical observations of a positive correlation between relative abundance and strength of average feedback serves as evidence that local scale negative feedbacks play a prominent role in structuring plant communities. We also identify that this relationship depends upon local scale plant dispersal and feedback which generates clumping and magnifies the negative feedbacks.
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影响因子：
3.4
作者：
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通讯作者：
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