Trait convergence and trait divergence in lake phytoplankton reflect community assembly rules.
Trait convergence and trait divergence in lake phytoplankton reflect community assembly rules.
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DOI：
10.1038/s41598-020-76645-7
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发表时间：
2020-11-11
影响因子：
4.6
通讯作者：
Várbíró G
中科院分区：
文献类型：
--
作者：
Borics G;B-Béres V;Bácsi I;Lukács BA;T-Krasznai E;Botta-Dukát Z;Várbíró G
环境过滤和限制相似性是影响群落结构的局部作用过程。这些作用于物种性状的机制导致了群落内性状的趋同或分化。这些过程的作用可能会随着环境的梯度而变化，并且在压力优势假说中已经被概念化，该假说预测环境过滤的相对重要性会随着环境压力的增加而增加，竞争会减少。通过分析湖泊浮游植物组合的性状趋同和分化，我们研究了“限制相似性”和“环境过滤”的概念如何应用于这些微观水生群落，以及它们如何支持或反驳压力优势假说。利用零模型方法，研究了浮游植物性状在RDA典型轴表示的环境梯度上的分化和收敛。我们使用Rao 's二次熵作为功能多样性的度量，并计算每个样本的效应大小（ES）值。负ES值表示性状趋同，即群落组装中环境过滤的概率较高；正ES值表示性状分化，强调限制相似性（生态位划分）的重要性，即浮游植物之间的竞争。结果表明，在浮游植物群落中，限制相似性和环境过滤可能同时发生作用，但这两种组合机制对浮游植物性状分布的影响不同，且随研究尺度的变化而变化。研究ES值随不同尺度的变化，结果部分支持了压力优势假说，即环境过滤的相对重要性随着环境压力的增加而增加，竞争的相对重要性随着环境压力的增加而降低。
Environmental filtering and limiting similarity are those locally acting processes that influence community structure. These mechanisms acting on the traits of species result in trait convergence or divergence within the communities. The role of these processes might change along environmental gradients, and it has been conceptualised in the stress-dominance hypothesis, which predicts that the relative importance of environmental filtering increases and competition decreases with increasing environmental stress. Analysing trait convergence and divergence in lake phytoplankton assemblages, we studied how the concepts of ‘limiting similarity’ versus ‘environmental filtering’ can be applied to these microscopic aquatic communities, and how they support or contradict the stress-dominance hypothesis. Using a null model approach, we investigated the divergence and convergence of phytoplankton traits along environmental gradients represented by canonical axes of an RDA. We used Rao’s quadratic entropy as a measure of functional diversity and calculated effect size (ES) values for each sample. Negative ES values refer to trait convergence, i.e., to the higher probability of the environmental filtering in community assembly, while positive values indicate trait divergence, stressing the importance of limiting similarity (niche partitioning), that is, the competition between the phytoplankters. Our results revealed that limiting similarity and environmental filtering may operate simultaneously in phytoplankton communities, but these assembly mechanisms influenced the distribution of phytoplankton traits differently, and the effects show considerable changes along with the studied scales. Studying the changes of ES values along with the various scales, our results partly supported the stress-dominance hypothesis, which predicts that the relative importance of environmental filtering increases and competition decreases with increasing environmental stress.
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影响因子：
1
作者：
Borics, Gabor;Lukacs, Balazs A.;Varbiro, Gabor
通讯作者：
Varbiro, Gabor
影响因子：
4.6
作者：
Acs, Eva;Foldi, Angela;Botta-Dukat, Zoltan
通讯作者：
Botta-Dukat, Zoltan
DOI：
10.1073/pnas.0704716104
发表时间：
2007-12-26
影响因子：
11.1
作者：
Diaz, Sandra;Lavorel, Sandra;Robson, Matthew
通讯作者：
Robson, Matthew
影响因子：
6.1
作者：
Cornwell, William K.;Ackerly, David D.
通讯作者：
Ackerly, David D.
影响因子：
2.8
作者：
Botta-Dukát, Z
通讯作者：
Botta-Dukát, Z