Individual species affect plant traits structure in their surroundings: evidence of functional mechanisms of assembly
Individual species affect plant traits structure in their surroundings: evidence of functional mechanisms of assembly
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DOI：
10.1007/s00442-016-3547-z
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发表时间：
2016-04-01
期刊：
影响因子：
2.7
通讯作者：
Escudero, Adrian
中科院分区：
文献类型：
--
作者：
Chacon-Labella, Julia;de la Cruz, Marcelino;Escudero, Adrian
通过使用功能性状评估社区组装是一个很有前途的工具，用于测试生态位和共存理论所产生的预测。虽然相邻物种之间的相互作用及其种间差异是已知的驱动力共存的强烈的空间信号，评估在不同的空间尺度上的功能结构的社区的单个物种的作用仍然是一个挑战。在这里，我们问是否个别物种发挥可衡量的影响，在当地的组合不同的功能特征的空间组织。我们首先提出并计算两个功能，描述不同方面的功能性状组织在多个尺度上围绕单个物种：个人加权平均面积关系和个人功能多样性面积关系。其次，我们开发了一个概念模型，这两个指标的关系和同时变化，提供了五种替代方案，以应对一些目标物种的能力，以修改其邻居的环境和可能的组装机制。我们的研究结果表明，一些物种的影响的空间结构的特定功能性状，但他们的影响总是局限于最精细的空间尺度。在我们的概念模型的基础上，所观察到的模式指向两个主要机制驱动的功能结构的社区在精细尺度上，“生物”过滤冥想的个别物种和资源分区驱动的间接促进，而不是竞争机制。
Evaluating community assembly through the use of functional traits is a promising tool for testing predictions arising from Niche and Coexistence theories. Although interactions among neighboring species and their inter-specific differences are known drivers of coexistence with a strong spatial signal, assessing the role of individual species on the functional structure of the community at different spatial scales remains a challenge. Here, we ask whether individual species exert a measurable effect on the spatial organization of different functional traits in local assemblages. We first propose and compute two functions that describe different aspects of functional trait organization around individual species at multiple scales: individual weighted mean area relationship and individual functional diversity area relationship. Secondly, we develop a conceptual model on the relationship and simultaneous variation of these two metrics, providing five alternative scenarios in response to the ability of some target species to modify its neighbor environment and the possible assembly mechanisms involved. Our results show that some species influence the spatial structure of specific functional traits, but their effects were always restricted to the finest spatial scales. In the basis of our conceptual model, the observed patterns point to two main mechanisms driving the functional structure of the community at the fine scale, "biotic" filtering meditated by individual species and resource partitioning driven by indirect facilitation rather than by competitive mechanisms.