Between- and within-species trait variability and the assembly of sapling communities in forest patches
Between- and within-species trait variability and the assembly of sapling communities in forest patches
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DOI：
10.1111/jvs.12223
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发表时间：
2015-01-01
影响因子：
2.8
通讯作者：
Duarte, Leandro D. S.
中科院分区：
文献类型：
--
作者：
Carlucci, Marcos B.;Debastiani, Vanderlei J.;Duarte, Leandro D. S.
在一个幼树元群落中，比叶面积的种间性状变异（BSV）和种内性状变异（WSV）的大小是多少？物种周转和WSV在多大程度上影响了群落水平对环境梯度的平均性状反应和性状在该梯度上的传播模式？WSV在植物对环境变化的反应和生态位划分中的作用是什么？LocationForest patches在一个原生草原矩阵在南部Brazils.MethodsWe记录树苗在社区地块的树冠开放度梯度的森林补丁，并描述了每一个1129个人使用SLA。首先，我们将性状变异划分为BSV和WSV，而不考虑小区中的共现。然后，使用社区数据，我们划分的总变异的社区加权性状平均值（CWM）和饶的功能多样性（FD）的组件解释的树冠开放，物种周转和WSV。我们还划分了WSV对FD的影响。最后，我们探讨了CWM和FD的梯度使用整个性状的变异，只有BSV或只有WSV.ResultsSpecific叶面积提出了很大比例的物种内的变化（37%），虽然它的物种之间的变化（63%）。物种营业额和WSV解释48%和19%的变化，CWM跨梯度，分别。物种营业额和WSV解释51%和45%的FD跨梯度的变化，分别。种内SLA的变化比群落内的变化更沿着梯度。种内变异性增强了整个梯度的CWM和FD的变化。冠层开度显著预测CWM在所有水平，FD在所有，但在种内level.ConclusionsPlastic反应的物种反映了平均响应的社区环境梯度。种内性状变异增强了植物对环境变化的平均响应以及生态位划分，并且在使物种能够在更宽的环境梯度中建立方面尤为重要。我们的研究提供了新的证据，表明人口水平的现象对社区集会很重要。
QuestionsWhat is the magnitude of between-species trait variability (BSV) and within-species trait variability (WSV) of specific leaf area (SLA) in a sapling meta-community? To what extent do species turnover and WSV influence community-level mean trait responses to an environmental gradient and trait spread patterns across this gradient? What is the role of WSV for mean plant responses to environmental variation and niche partitioning in structuring sapling communities?LocationForest patches within a native grassland matrix in southern Brazil.MethodsWe recorded saplings in community plots across a canopy openness gradient in forest patches and described each of the 1129 individuals using SLA. First, we partitioned trait variation into BSV and WSV irrespective of co-occurrence in plots. Then, using the community data, we partitioned the total variation of community-weighted trait means (CWM) and Rao's functional diversity (FD) into components explained by canopy openness, species turnover and WSV. We also partitioned the effects of WSV between and within plots on FD. Finally, we explored the responses of CWM and FD to the gradient using the whole trait variability, only BSV or only WSV.ResultsSpecific leaf area presented a substantial proportion of variation within species (37%), although it varied more between species (63%). Species turnover and WSV explained 48% and 19% of the variation in CWM across the gradient, respectively. Species turnover and WSV explained 51% and 45% of the variation in FD across the gradient, respectively. SLA varied within species more along the gradient than within communities. Within-species variability enhanced shifts in CWM and FD across the gradient. Canopy openness significantly predicted CWM at all levels, and FD at all but the within-species level.ConclusionsPlastic responses of species mirrored the average response of communities to the environmental gradient. Within-species trait variability enhanced the mean plant responses to environmental variation as well as niche partitioning, and was especially important in enabling species to establish in a wider portion of the environmental gradient. Our study provides new evidence that population-level phenomena matter for community assembly.