Intraspecific variability and trait-based community assembly
Intraspecific variability and trait-based community assembly
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DOI：
10.1111/j.1365-2745.2010.01687.x
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发表时间：
2010-09-01
影响因子：
5.5
通讯作者：
Muller, Serge
中科院分区：
文献类型：
--
作者：
Jung, Vincent;Violle, Cyrille;Muller, Serge
P>1。基于特征的方法应用于社区生态学，导致了相当大的进步，了解环境过滤器的影响，物种组装。虽然植物性状在种间和种内都存在差异，但种内性状变异在控制物种共存的非随机组装机制中的作用，包括生境过滤和生态位分化，目前还知之甚少.我们调查的作用，种内变异的三个关键功能性状-比叶面积（SLA），叶干物质含量（LDMC）和高度-在构建草地群落分布沿着洪水梯度。我们量化了种内变异相对于种间差异在性状梯度关系中的贡献，并使用零模型方法检测了有和没有种内变异的生境过滤和生态位分化模式.群落平均比叶面积和高度沿着淹水梯度变化显著，种内变异分别占44%和32%。LDMC没有变化沿着梯度，与和不占种内变异。我们的零模型的方法揭示了显着的模式的栖息地过滤和生态位分化的SLA和高度，但不是LDMC。更值得注意的是，考虑种内性状变异性大大增加了生境过滤的检测，是检测生态位分化过程的必要条件.合成.我们的研究为种内性状变异在群落组装中的重要作用提供了证据。我们的研究结果表明，种内性状变异促进物种共存，使物种通过非生物和生物过滤器。我们认为，群落生态学将受益于更多的关注种内变异。
P>1. Trait-based approaches applied to community ecology have led to a considerable advance in understanding the effect of environmental filters on species assembly. Although plant traits are known to vary both between and within species, little is known about the role of intraspecific trait variability in the non-random assembly mechanisms controlling the coexistence of species, including habitat filtering and niche differentiation.2. We investigate the role of intraspecific variability in three key functional traits - specific leaf area (SLA), leaf dry matter content (LDMC) and height - in structuring grassland communities distributed along a flooding gradient. We quantified the contribution of intraspecific variability relative to interspecific differences in the trait-gradient relationship, and we used a null model approach to detect patterns of habitat filtering and niche differentiation, with and without intraspecific variability.3. Community mean SLA and height varied significantly along the flooding gradient and intraspecific variability accounted for 44% and 32%, respectively, of these trait-gradient relationships. LDMC did not vary along the gradient, with and without accounting for intraspecific variability. Our null model approach revealed significant patterns of habitat filtering and niche differentiation for SLA and height, but not for LDMC. More strikingly, considering intraspecific trait variability greatly increased the detection of habitat filtering and was necessary to detect niche differentiation processes.4. Synthesis. Our study provides evidence for a strong role of intraspecific trait variability in community assembly. Our findings suggest that intraspecific trait variability promotes species coexistence, by enabling species to pass through both abiotic and biotic filters. We argue that community ecology would benefit from more attention to intraspecific variability.