后果是打断食物链，使许多动物和捕食它们的动物饿死。
The effect was to disrupt the food chain, starving many animals and those that preyed on them.
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。
Scientists hope they can turn things around for this important apex predator, meaning one that is on top of the food chain.
对于在场发现的这半块头骨及其它20000块骨片的测量表明，这种动物属于食物链上游的动物，它可捕食乌贼，鱼类以及其他海洋爬行动物。
Measurements of the partial skull and 20, 000 other bone fragments uncovered at the site showed that the creature was at the top of the food chain, preying on squid, fish and other Marine reptiles.
如果将关注食物链顶端和底端的方法同时应用到全球性数据上，那么，科学家们得出的结论是，过去10年的工业捕渔更偏向捕食低食物链鱼类，而对高食物链等级的鱼类而言，它们的食物总量减少了将近一半，倘若按照食物链理论的逻辑，现存高食物链等级的鱼类总数是增加了而不是减少了，因此，不能够简单地认为，工业“捕渔”导致鱼类总体的数量减少。
Applying both methods to worldwide data, the scientists say industrial fishing over the past decades has not simply worked its way downwards from the top of the food chain -- it has gone upwards, too.
鲨鱼是位于海洋食物链最顶端的捕食者。
过去的食物链中谁吃谁的问题很少能明确下来。尽管哪些物种是捕食者。
WHO ate whom in the food chains of the past is rarely clear.
食物链的链环是以植物为生的食草动物和捕食食草动物的食肉动物。
The links of the chain are formed by the herbivores that eat the plants and the carnivores that feed on the herbivores.
这些动植物主体通过捕食关系构成食物链。
Predation relations link these agents to form the food chain.
曾几何时，生物学家们有点过度使用这个证据，即这些物种通过杀死体质弱者或者仅捕食那些它们认为无价值的物种来维持食物链的正常运转。
Time was when biologists somewhat over-worded the evidence that these creatures preserve the health of game by killing the physically weak, or that they prey only on "worthless" species.
所以这取决于鲸鱼捕食的动物在食物链中的位置。越在顶层的捕食者摄入的毒素越多。
So it just depends where on the food web they eat and as you go higher up the food web, more toxin gets concentrated.
本文考虑一类简单食物链模型，其中被捕食者对于第一捕食者具有群体防卫能力。
This paper considers a class of one-linear 3-species models of simple food chains.
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。
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。
In chapter 3, in this paper, we investigated a three trophic level food chain system with periodic constant impulsive perturbations for top predator.
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