Species richness and food-web structure jointly drive community biomass and its temporal stability in fish communities,Ecology Letters

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Species richness and food-web structure jointly drive community biomass and its temporal stability in fish communities
Ecology Letters ( IF 7.6 ) Pub Date : 2021-08-22 , DOI: 10.1111/ele.13857
Alain Danet ₁ , Maud Mouchet ₁ , Willem Bonnaffé ₂ , Elisa Thébault ₃ , Colin Fontaine ₁

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Biodiversity–ecosystem functioning and food-web complexity–stability relationships are central to ecology. However, they remain largely untested in natural contexts. Here, we estimated the links among environmental conditions, richness, food-web structure, annual biomass and its temporal stability using a standardised monitoring dataset of 99 stream fish communities spanning from 1995 to 2018. We first revealed that both richness and average trophic level are positively related to annual biomass, with effects of similar strength. Second, we found that community stability is fostered by mean trophic level, while contrary to expectation, it is decreased by species richness. Finally, we found that environmental conditions affect both biomass and its stability mainly via effects on richness and network structure. Strikingly, the effect of species richness on community stability was mediated by population stability rather than synchrony, which contrasts with results from single trophic communities. We discuss the hypothesis that it could be a characteristic of multi-trophic communities.

中文翻译：

物种丰富度和食物网结构共同驱动鱼类群落的生物量及其时间稳定性

生物多样性-生态系统功能和食物网复杂性-稳定性关系是生态学的核心。然而，它们在自然环境中仍然很大程度上未经测试。在这里，我们使用 1995 年至 2018 年间 99 个河流鱼类群落的标准化监测数据集估计了环境条件、丰富度、食物网结构、年生物量及其时间稳定性之间的联系。我们首先揭示了丰富度和平均营养水平都是与年生物量正相关，具有相似强度的影响。其次，我们发现平均营养水平促进了群落稳定性，而与预期相反，物种丰富度降低了群落稳定性。最后，我们发现环境条件主要通过对丰富度和网络结构的影响来影响生物量及其稳定性。引人注目的是，物种丰富度对群落稳定性的影响是由种群稳定性而非同步性介导的，这与单一营养群落的结果形成鲜明对比。我们讨论了它可能是多营养群落特征的假设。

更新日期：2021-10-08

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