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Interplay between the paradox of enrichment and nutrient cycling in food webs
Oikos ( IF 3.4 ) Pub Date : 2020-11-05 , DOI: 10.1111/oik.07937
Pierre Quévreux 1 , Sébastien Barot 1 , Élisa Thébault 1
Affiliation  

Nutrient cycling is fundamental to ecosystem functioning. Despite recent major advances in the understanding of complex food web dynamics, food web models have so far generally ignored nutrient cycling. However, nutrient cycling is expected to strongly impact food web stability and functioning. To make up for this gap, we built an allometric and size structured food web model including nutrient cycling. By releasing mineral nutrients, recycling increases the availability of limiting resources for primary producers and links each trophic level to the bottom of food webs. We found that nutrient cycling can provide a significant part of the total nutrient supply of the food web, leading to a strong enrichment effect that promotes species persistence in nutrient poor ecosystems but leads to a paradox of enrichment at high nutrient inputs. The presence of recycling loops linking each trophic level to the basal resources weakly affects species biomass temporal variability in the food web. Recycling loops tend to slightly dampen the destabilising effect of nutrient enrichment on consumer temporal variability while they have opposite effects for primary producers. By considering nutrient cycling, this new model improves our understanding of the response of food webs to nutrient availability and opens perspectives to better link studies on food web dynamics and ecosystem functioning.

中文翻译:

食物网中浓缩与养分循环悖论之间的相互作用

营养循环是生态系统功能的基础。尽管最近在了解复杂的食物网动态方面取得了重大进展,但到目前为止,食物网模型通常都忽略了养分循环。但是,预计养分循环会严重影响食物网的稳定性和功能。为了弥补这一差距,我们建立了一个包括营养循环在内的异形和尺寸结构化的食物网模型。通过释放矿物质营养,循环利用增加了初级生产者有限资源的可用性,并将每个营养级与食物网的底部联系起来。我们发现,养分循环可以在食物网的总养分供应中提供很大一部分,从而导致强大的富集效应,促进了物种在营养不良的生态系统中的持久性,但导致了高养分投入下的富集悖论。将每个营养级与基础资源联系起来的循环循环的存在,对食物网中物种生物量的时间变异性影响较小。循环循环往往会略微减弱养分富集对消费者时间变异性的破坏稳定作用,而对初级生产者却产生相反的影响。通过考虑养分循环,这种新模型提高了我们对食物网对养分有效性的响应的理解,并为更好地链接有关食物网动力学和生态系统功能的研究开辟了前景。循环循环往往会略微减弱养分富集对消费者时间变异性的破坏稳定作用,而对初级生产者却产生相反的影响。通过考虑养分循环,这种新模型提高了我们对食物网对养分有效性的响应的理解,并为更好地链接有关食物网动力学和生态系统功能的研究开辟了前景。循环循环往往会略微减弱养分富集对消费者时间变异性的破坏稳定作用,而对初级生产者却产生相反的影响。通过考虑养分循环,这种新模型提高了我们对食物网对养分有效性的响应的理解,并为更好地链接有关食物网动力学和生态系统功能的研究开辟了前景。
更新日期:2021-01-01
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