Scientists hope they can turn things around for this important apex predator, meaning one that is on top of the food chain.

科学家们希望他们为这种重要的顶级捕食者——处于食物链顶端的捕食者扭转局面。

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Birds are one of mankind's best friends, not only are they the natural predator of many types of harmful insects, they are one of the most important links in nature's food chain.

鸟类是人类最好的朋友之一，它们不但是许多害虫的天敌，自然生物链重要一环。

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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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Another characteristic, it added, was that mercury became more concentrated as it moved up the food chain, reaching its highest levels in predator fish that could be consumed by humans.

BBC: Nations agree on legally binding mercury rules

Another characteristic is that mercury becomes more concentrated as it moves up the food chain, reaching its highest levels in predator fish that may be consumed by humans, the report adds.

BBC: UN: Rising mercury emissions increase risk to humans