Too much of a good thing: Shrub benefactors are less important in higher diversity arid ecosystems,Journal of Ecology

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Too much of a good thing: Shrub benefactors are less important in higher diversity arid ecosystems
Journal of Ecology ( IF 5.3 ) Pub Date : 2021-01-26 , DOI: 10.1111/1365-2745.13596
Christopher J Lortie _{1,

2} , Mario Zuliani ₁ , Nargol Ghazian ₁ , Stephanie Haas ₁ , Jenna Braun ₁ , Malory Owen ₁ , Florencia Miguel ₃ , Merav Seifan ₄ , Alessandro Filazzola ₁ , Jacob Lucero ₁

Affiliation

The biodiversity–ecosystem function literature provides a useful framework to examine many processes associated with species diversity in ecology. One such context is the maintenance of biodiversity by facilitation in arid ecosystems.
Here, we examined the complex interactions between local plant species richness and the intensity of shrub facilitation for maintaining biodiversity in arid plant communities.
A synthesis including a meta‐analysis was used to compile nearly 600 papers on positive interactions mediated by shrubs in dryland plant communities (search terms: shrub, positive, facilitat*) to examine whether interactions in these studies changed with reported local species richness. A total of 19 studies and 141 independent instances directly examined and reported facilitation of diversity measures in naturally assembled plant communities and provided estimates of local species richness.
Synthesis. The net effect of increasing local plant species richness was negative and shifted the relative frequency of interactions with shrubs from positive to negative with increasing local species richness. This relationship suggests that increases in richness do not always enhance functions that maintain diversity in plants communities likely due to concurrent increases in the indirect negative interactions between species under shrubs or in changes in the local species pool.

中文翻译：

太好了：在更高多样性和干旱的生态系统中，灌木的恩人并不那么重要

生物多样性-生态系统功能文献提供了一个有用的框架，可以检查与生态中物种多样性相关的许多过程。一种这样的情况是通过促进干旱生态系统来维持生物多样性。
在这里，我们研究了当地植物物种丰富度与灌木促进强度之间的复杂相互作用，以维持干旱植物群落中的生物多样性。
包括荟萃分析在内的综合研究被用于编辑近600篇关于干旱地区植物群落灌木介导的正向相互作用的论文（搜索术语：灌木，阳性，促进*），以检验这些研究中的相互作用是否随着报道的当地物种丰富度而改变。共有19项研究和141个独立实例直接进行了检查，并报告了在自然组装的植物群落中采取多样性措施的便利性，并提供了当地物种丰富度的估计。
综合。增加本地植物物种丰富度的净效应是负的，并且随着本地物种丰富度的增加，与灌木相互作用的相对频率从正向变为负。这种关系表明，丰富度的提高并不总是会增强维持植物群落多样性的功能，这可能是由于灌木下物种间间接负互动的同时发生或本地物种库的变化所致。

更新日期：2021-01-26

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