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微小降雨量变化驱动植物共存的实质性变化
作者:小柯机器人 发布时间:2022/11/6 19:07:57

美国加州大学Mary N. Van Dyke等研究人员共同合作近期取得重要工作进展,他们研究发现微小降雨量变化驱动植物共存的实质性变化。相关研究成果2022年11月2日在线发表于《自然》杂志上。

研究人员利用加利福尼亚一个一年生草地群落,探讨降水变化如何通过对单个物种直接影响,以及通过改变物种间竞争互动强度来改变竞争动态。研究人员在野外环境和降水减少的情况下种植植物,对一个竞争模型进行参数化,用它来量化决定物种在每种降水条件下共存的稳定生态位和适应度差异。研究人员发现,降水减少对单独生长的物种没有什么直接影响,但它从质量上改变了15个物种对中10个的预测竞争结果。

此外,功能更相似的物种对受到的影响小,功能多样化的群落更可能由于物种间相互作用变化而受到威胁。研究结果表明,在预测物种和群落对全球变化的反应时,考虑到物种相互作用的变化是至关重要的。

据介绍,尽管降水模式对植物分布的影响早已为人所知,但气候变化对物种间相互作用以及群落组成的影响却鲜为人知。

附:英文原文

Title: Small rainfall changes drive substantial changes in plant coexistence

Author: Van Dyke, Mary N., Levine, Jonathan M., Kraft, Nathan J. B.

Issue&Volume: 2022-11-02

Abstract: Although precipitation patterns have long been known to shape plant distributions1, the effect of changing climate on the interactions of species and therefore community composition is far less understood2,3. Here, we explored how changes in precipitation alter competitive dynamics via direct effects on individual species, as well as by the changing strength of competitive interactions between species, using an annual grassland community in California. We grew plants under ambient and reduced precipitation in the field to parameterize a competition model4 with which we quantified the stabilizing niche and fitness differences that determine species coexistence in each rainfall regime. We show that reduced precipitation had little direct effect on species grown alone, but it qualitatively shifted predicted competitive outcomes for 10 of 15 species pairs. In addition, species pairs that were functionally more similar were less likely to experience altered outcomes, indicating that functionally diverse communities may be most threatened by changing interactions. Our results highlight how important it is to account for changes to species interactions when predicting species and community response to global change.

DOI: 10.1038/s41586-022-05391-9

Source: https://www.nature.com/articles/s41586-022-05391-9

期刊信息

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:43.07
官方网址:http://www.nature.com/
投稿链接:http://www.nature.com/authors/submit_manuscript.html