Small rainfall changes drive substantial changes in plant coexistence

Small rainfall changes drive substantial changes in plant coexistence
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降雨量的微小变化会导致植物共存发生巨大变化

DOI:
10.1038/s41586-022-05391-9
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发表时间:
2022
期刊:
影响因子:
64.8
通讯作者:
Kraft, Nathan J.
Kraft, Nathan J.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Van Dyke, Mary N.;Levine, Jonathan M.;Kraft, Nathan J.

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虽然人们早就知道降水模式会影响植物分布,但气候变化对物种相互作用的影响以及因此对群落组成的影响却知之甚少。在这里,我们利用加州的一年生草原群落,探讨了降水量的变化如何通过对单个物种的直接影响以及物种之间竞争相互作用强度的变化来改变竞争动态。我们在环境下种植植物,并减少在该领域的降水parameterize的竞争模型,我们量化的稳定生态位和健身差异,确定物种共存,在每个降雨制度。我们发现,减少降水对单独生长的物种几乎没有直接影响,但它定性地改变了15个物种对中的10个的预测竞争结果。此外,功能上更相似的物种对不太可能经历改变的结果,这表明功能多样的社区可能最受相互作用变化的威胁。我们的研究结果强调了在预测物种和群落对全球变化的反应时,考虑物种相互作用的变化是多么重要。
Although precipitation patterns have long been known to shape plant distributions, the effect of changing climate on the interactions of species and therefore community composition is far less understood,. 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 model 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.
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