The hidden role of multi-trophic interactions in driving diversity–productivity relationships,Ecology Letters

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The hidden role of multi-trophic interactions in driving diversity–productivity relationships
Ecology Letters ( IF 7.6 ) Pub Date : 2021-11-30 , DOI: 10.1111/ele.13935
Georg Albert _{1,

2} , Benoit Gauzens _{1,

2} , Michel Loreau ₃ , Shaopeng Wang ₄ , Ulrich Brose _{1,

2}

Affiliation

Resource-use complementarity of producer species is often invoked to explain the generally positive diversity–productivity relationships. Additionally, multi-trophic interactions that link processes across trophic levels have received increasing attention as a possible key driver. Given that both are integral to natural ecosystems, their interactive effect should be evident but has remained hidden. We address this issue by analysing diversity–productivity relationships in a simulation experiment of producer communities nested within complex food-webs, manipulating resource-use complementarity and multi-trophic animal richness. We show that these two mechanisms interactively create diverse communities of complementary producer species. This shapes diversity–productivity relationships such that their joint contribution generally exceeds their individual effects. Specifically, multi-trophic interactions in animal-rich ecosystems facilitate producer coexistence by preventing competitive exclusion despite overlaps in resource-use, which increases the realised complementarity. The interdependence of food-webs and producer complementarity in creating biodiversity–productivity relationships highlights the importance to adopt a multi-trophic perspective on biodiversity–ecosystem functioning relationships.

中文翻译：

多营养相互作用在驱动多样性-生产力关系中的隐藏作用

生产者物种的资源利用互补性经常被用来解释普遍积极的多样性-生产力关系。此外，将跨营养级别的过程联系起来的多营养相互作用作为可能的关键驱动因素受到越来越多的关注。鉴于两者都是自然生态系统的组成部分，它们的互动效果应该是显而易见的，但一直隐藏着。我们通过分析嵌套在复杂食物网中的生产者社区的模拟实验中的多样性 - 生产力关系来解决这个问题，操纵资源利用互补性和多营养动物丰富性。我们表明，这两种机制交互地创建了互补生产者物种的多样化群落。这塑造了多样性-生产力关系，使得它们的共同贡献通常超过它们的个体影响。具体而言，尽管资源使用重叠，但动物丰富的生态系统中的多营养相互作用通过防止竞争排斥来促进生产者共存，这增加了实现的互补性。食物网的相互依赖和生产者的互补性在创造生物多样性-生产力关系方面凸显了对生物多样性-生态系统功能关系采用多营养视角的重要性。

更新日期：2021-11-30

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