Phylogenetic structure of annual plant communities along an aridity gradient. Interacting effects of habitat filtering and shifting plant-plant interactions
Phylogenetic structure of annual plant communities along an aridity gradient. Interacting effects of habitat filtering and shifting plant-plant interactions
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DOI：
10.1080/07929978.2017.1288477
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发表时间：
2017-01-01
影响因子：
1
通讯作者：
Tielboerger, Katja
中科院分区：
文献类型：
--
作者：
Garcia-Camacho, Raul;Metz, Johannes;Tielboerger, Katja
群落的系统发育结构（PSC）揭示了进化历史如何影响群落组装过程。然而，一年生群落的 PSC 模式存在重要的知识空白，需要沿着干燥生态系统的环境梯度进行研究，其中几个过程塑造 PSC。在这里，我们研究了以色列沿干旱梯度的一年生植物的 PSC，包括八年、两个空间尺度、灌木对林下层的影响以及重要性状的系统发育信号。不断增加的干旱胁迫导致PSC在梯度的干燥端过度分散，这表明物种之间的相关性比偶然预期的要低。这在较小的空间尺度上得到了支持，在较干燥的地区，开放、更干旱的生境中的群落比护理灌木下的群落更加过度分散。有趣的是，一些与抗旱性相关的关键性状在系统发育中并未保留。总之，我们的研究结果表明，虽然栖息地过滤选择了抗旱策略，但这些策略沿着多个截然不同的进化谱系独立进化。我们全面的 PSC 研究为栖息地过滤和植物间相互作用的相互作用提供了强有力的证据，特别强调在未来对 PSC 模式的解释中不应假设性状的保守进化。
The phylogenetic structure of communities (PSC) reveals how evolutionary history affects community assembly processes. However, there are important knowledge gaps on PSC patterns for annual communities and there is a need for studies along environmental gradients in dry ecosystems where several processes shape PSC.Here, we investigated the PSC of annual plants along an aridity gradient in Israel, including eight years, two spatial scales, the effects of shrubs on understory, and the phylogenetic signal of important traits. Increasing drought stress led to overdispersed PSC at the drier end of the gradient, indicating that species were less related than expected by chance. This was supported at a smaller spatial scale, where within the drier sites, communities in open- more arid- habitats were more overdispersed than those under nurse shrubs. Interestingly, some key traits related to drought resistance were not conserved in the phylogeny. Together, our findings suggested that while habitat filtering selected for drought resistance strategies, these strategies evolved independently along multiple contrasting evolutionary lineages. Our comprehensive PSC study provides strong evidence for the interacting effects of habitat filtering and plant- plant interactions, particularly highlighting that the conservative evolution of traits should not be assumed in future interpretations of PSC patterns.