To learn from peasants is to re-stitch the trophic chain and turn fertilization into water purification.

向农民学习，就是要缝合这个被切断的营养链，让施肥的过程也成为净化水体的过程。

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In chapter 3, in this paper, we investigated a three trophic level food chain system with periodic constant impulsive perturbations for top predator.

第三章将在对顶级捕食者进行脉冲干扰，即周期性的向食物链中投放定量的顶级捕食者的前提下，研究三种群食物链系统的稳定性。

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This type of impact by top-of-the-food-chain predators on lower trophic levels is well known in marine systems, said Peterson, and has been shown to occur in terrestrial systems in the study of invertebrates.

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The resulting adjustment among the different levels of the food chain, known as "trophic cascades", helped explain why the regime shifts occurred, Dr Daskalov suggested.

BBC: NEWS | Science/Nature | Fishing 'destabilises Black Sea'