Effects of moisture and density-dependent interactions on tropical tree diversity

Effects of moisture and density-dependent interactions on tropical tree diversity
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水分和密度依赖性相互作用对热带树木多样性的影响

DOI:
10.1038/s41586-023-05717-1
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发表时间:
2023
期刊:
影响因子:
64.8
通讯作者:
Wright, S. Joseph
Wright, S. Joseph
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lebrija-Trejos, Edwin;Hernández, Andrés;Wright, S. Joseph

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热带树木的多样性随着降雨量的增加而增加。直接生理效应的水分供应和间接影响介导的生物相互作用被假设为有助于这种泛热带增加多样性与降雨,-。以往的研究表明,直接的生理效应的变化,在水分有效性对树木的生存和多样性,-,但间接影响水分有效性的变化,生物相互作用介导的多样性尚未显示。在这里,我们评估的年际变化之间的关系,在巴拿马中部的水分供应,密度依赖的相互作用的强度,和幼苗多样性。在20个年度队列中,生命的第一年,多样性随着土壤湿度的增加而增加。这些第一年的多样性变化持续了至少15年。水分敏感物种的差异生存没有贡献的多样性的变化。相反,同种之间的负密度依赖的相互作用更强,增加了多样性,在多雨的年份。这表明,水分的可用性提高多样性间接通过水分敏感,密度依赖同种相互作用。病原体和植食性昆虫介导热带森林中幼苗之间的相互作用,-,许多这些植物天敌本身对水分敏感,-。气候变化和生境退化引起的水分供应的变化可能会改变这些相互作用和热带树木多样性。
Tropical tree diversity increases with rainfall,. Direct physiological effects of moisture availability and indirect effects mediated by biotic interactions are hypothesized to contribute to this pantropical increase in diversity with rainfall, , , –. Previous studies have demonstrated direct physiological effects of variation in moisture availability on tree survival and diversity,, , –, but the indirect effects of variation in moisture availability on diversity mediated by biotic interactions have not been shown. Here we evaluate the relationships between interannual variation in moisture availability, the strength of density-dependent interactions, and seedling diversity in central Panama. Diversity increased with soil moisture over the first year of life across 20 annual cohorts. These first-year changes in diversity persisted for at least 15 years. Differential survival of moisture-sensitive species did not contribute to the observed changes in diversity. Rather, negative density-dependent interactions among conspecifics were stronger and increased diversity in wetter years. This suggests that moisture availability enhances diversity indirectly through moisture-sensitive, density-dependent conspecific interactions. Pathogens and phytophagous insects mediate interactions among seedlings in tropical forests, , , , , –, and many of these plant enemies are themselves moisture-sensitive, , , , , , , –. Changes in moisture availability caused by climate change and habitat degradation may alter these interactions and tropical tree diversity.
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发表时间: 2014-02-01
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影响因子: 3.4
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DOI: --
发表时间: 2018
期刊:
影响因子: --
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