We investigate optimal policy for a predator-prey system with age-dependent.
研究一类具有年龄结构的捕食-食饵种群动力系统的最优收获策略。
This paper discusses the state of Hopf bifurcation in a predator-prey system when parameter varies in some field, and analyzes the stability of the system.
讨论了一类捕食者-食饵系统的参数在某个范围变化时在非零不动点处产生霍普夫分叉的情况，并对其稳定性进行了分析。
It included two parts. In first part a predator-prey model was proposed. Two stable states were obtained according to eclolgical data of panda and bawboo in area of Wolong Reserve.
包括两大部分：第一部分中，假设为捕食被捕食模型，根据在卧龙保护区收集的数据得到两个稳定态；
A system of retarted functional differential equations as a predator-prey model with stage structure and dispersion is discussed. Conditions for global stability of the system are given.
讨论了一类带有扩散和具有阶段结构与时滞的两种群捕食系统，分析了该系统的非负不变性、边界平衡点性质及全局渐近稳定性。
In the second part, a predator-prey model of ordinary differential with one-way diffusion is studied considering the monsoon, river flows, other natural conditions and living habits as background.
第二章以季风、河流流向等自然条件和生物生活习性为背景，建立食饵单向扩散的捕食-被捕食系统的常微分模型。
At night, the pit organs allow snakes to "see" an image of their predator or prey-- as an infrared camera does-- giving them a unique extra sense.
在夜晚，窝器能让蛇类“看到”捕食者或者猎物的图像——正如红外摄影机一样——赋予他们一个独特的额外感官。
Parasitism is a kind of predator-prey relationship in which one organism, the parasite, derives its food at the expense of its symbiotic associate, the host.
寄生是一种捕食者与被捕食者之间的关系，寄生者利用共生伙伴——宿主来获取食物。
And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover.
当一种猎物变得稀有时，如果捕猎者能够转向其他更容易找到的物种，这种转变可以让原来的猎物数量得到恢复。
When a predator always eats huge numbers of a single prey, the two species are strongly linked.
一种掠食动物经常大量捕食单单一种猎物时，这两个物种是紧密联系的。
Biologists speculate that the mostly likely cause was a shift in Pacific Ocean currents, but food availability, changing river conditions and predator-prey relationships could be affecting the fish.
生物学家推测，最有可能的成因是太平洋洋流的变化，不过食物的取得、河流环境的改变、生物掠夺关系等，也都可能对鲑鱼造成影响。
The slinth is a large predator, fast as a cheetah, that spears its prey with its head, which is like a venomous lance.
slinth是一种大型食肉动物。
At night, the pit organs allow snakes to 'see' an image of their predator or prey - as an infrared camera does - giving them a unique extra sense.
在夜晚，窝器让蛇类“看到”捕食者或者猎物的图像——正如红外摄影机一样——赋予他们一个独特的额外感官。
Since the prey is so much larger than the predator, it sometimes takes the shrimp two weeks to finish off a single (living) starfish.
由于被捕食的动物要比捕食它们的掠夺者大得多，有时需要两个星期才能让小丑虾去吃完一个活海星。
Even if the prey had a good sensory system to notice a predator closing in, the success rate of a nocturnal attack may be higher than a diurnal attack.
即使猎物拥有很好的感知系统，注意到了食肉动物正在靠近，夜间攻击的成功率也可能比白天攻击的成功率高。
Now a study of broken teeth reveals that artistic licence has, at least for predator and prey, been rather accurate.
现在，一项对断裂牙齿的研究显示，艺术的想象还是很符合事实的，至少在食肉动物和猎物较量这块儿是这样。
“The idea of a man-made machine chopping a bird in half creates a visceral reaction, ” he said, “while the idea of a predator with its prey in its mouth — well we’ve seen that on the Nature Channel.
人造机器把鸟锯成两半，这种观点激发了人类的本能反应；而捕食者口中含着的猎物这一观点，我们会视之为自然的本性。
"The idea of a man-made machine chopping a bird in half creates a visceral reaction," he said, "while the idea of a predator with its prey in its mouth - well we've seen that on the Nature Channel."
人造机器把鸟锯成两半，这种观点激发了人类的本能反应；而捕食者口中含着的猎物这一观点，我们会视之为自然的本性。
They say that a prey animal's nervous system shuts down when the prey animal is snatched by a predator.
人们常说当捕食动物活捉住猎物时，被捕食者的神经系统像死机了一样。
We now know that its long legs made it a top predator, a mammal that could run down its prey at long distances, particularly, bison.
我们现在知道它的长腿使之成为顶级掠食者，这种哺乳动物能够长距离追逐猎物，特别是野牛。
In this paper, we present and analyze a simple model for a chemostat with predator, prey and periodically pulsed input and washout substrate.
在这篇文章中，我们提出并分析了一个具有捕食者，食饵和既有周期脉冲输入又有周期脉冲输出营养液的恒化器模型。
Her mother, a patient teacher, instructed Legadema in the skills she would need to survive as a predator: how to pin down prey and where to clamp on their throats with her jaws to suffocate them.
她的母亲是只有耐心的花豹，教导她成为一只懂得生存，而技术卓越的掠夺者；要等候在那处撂下猎物以及在喉头何处扣住使之窒息等。
In this paper, we consider a class of predator-prey system with functional responses.
本文讨论了一类具有功能反应函数的捕食食饵模型。
An annular model for chemostat was depicted by a group of ODE(ordinary differential equation) to imitate the ecosystem which included competition and predator-prey relations in nature.
为模拟自然界中既包含竞争关系又包含捕食-被捕食关系的生态系统，建立用常微分方程组表示的环状模型。
This paper deals with such a class of predator-prey models that the predator, in addition to the prey considered, has other natural sources of food.
本文研究这样的一类捕食模型：捕食者不但有模型中被捕食者作为食物，而且还有其它固定的自然食物源。
Sufficient conditions are obtained for the global existence of a positive periodic solution of periodic neutral delay predator-prey system by using the method of coincidence degree theory.
利用重合度理论建立了一类周期中立型时滞捕食者-食饵系统正周期解的全局存在性的充分条件。
What we study is a kind of prey-predator model with epidemic spreading in it based on agents' interactions.
我们研究的是一类基于个体相互作用的带有传染病的捕食者与被捕食者模型。
What we study is a kind of prey-predator model with epidemic spreading in it based on agents' interactions.
我们研究的是一类基于个体相互作用的带有传染病的捕食者与被捕食者模型。
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