Trophic downgrading decreases species asynchrony and community stability regardless of climate warming,Ecology Letters

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Trophic downgrading decreases species asynchrony and community stability regardless of climate warming
Ecology Letters ( IF 7.6 ) Pub Date : 2021-09-18 , DOI: 10.1111/ele.13885
Felipe Rezende _{1,

2} , Pablo A P Antiqueira ₂ , Owen L Petchey ₃ , Luiz Felipe M Velho ₄ , Luzia C Rodrigues ₄ , Gustavo Q Romero ₂

Affiliation

Theory and some evidence suggest that biodiversity promotes stability. However, evidence of how trophic interactions and environmental changes modulate this relationship in multitrophic communities is lacking. Given the current scenario of biodiversity loss and climate changes, where top predators are disproportionately more affected, filling these knowledge gaps is crucial. We simulated climate warming and top predator loss in natural microcosms to investigate their direct and indirect effects on temporal stability of microbial communities and the role of underlying stabilising mechanisms. Community stability was insensitive to warming, but indirectly decreased due to top predator loss via increased mesopredator abundance and consequent reduction of species asynchrony and species stability. The magnitude of destabilising effects differed among trophic levels, being disproportionally higher at lower trophic levels (e.g. producers). Our study unravels major patterns and causal mechanisms by which trophic downgrading destabilises large food webs, regardless of climate warming scenarios.

中文翻译：

无论气候变暖如何，营养降级都会降低物种的不同步性和群落稳定性

理论和一些证据表明，生物多样性促进稳定性。然而，缺乏营养相互作用和环境变化如何在多营养群落中调节这种关系的证据。鉴于目前生物多样性丧失和气候变化的情况，顶级掠食者受到的影响不成比例，填补这些知识空白至关重要。我们模拟了自然微观世界中的气候变暖和顶级捕食者损失，以研究它们对微生物群落时间稳定性的直接和间接影响以及潜在稳定机制的作用。群落稳定性对变暖不敏感，但由于中掠食者丰度增加以及随之而来的物种不同步性和物种稳定性的降低，顶级捕食者的损失间接降低。破坏稳定影响的程度因营养级而异，在较低的营养级（例如生产者）不成比例地更高。我们的研究揭示了营养降级破坏大型食物网的主要模式和因果机制，无论气候变暖情景如何。

更新日期：2021-11-11

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