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predators and prey
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  相似匹配句对
     3G Predators
     3G分食者
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     As general predators, Orius spp.
     小花蝽Orius spp.
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     Discovering Wild Predators of African grassland
     寻访非洲草原猛兽
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     CHARACTERISTICS OF THE SPECIES RICHNESS AND ABUNDANCE OF PREDATORS AND
     不同稻区节肢动物群落中捕食者与猎物的种类与数量特征
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     54 % Thrips palmi that were preyed by predators were preyed by C. chinensis. C.
     在所有被捕食的节瓜蓟马中,54%的蓟马被中华微刺盲蝽取食。
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  predators and prey
Use of chemical cues in detection of conspecific predators and prey
      
SICS would appear to be useless to an ambush forager and might disrupt its defensive crypticity, rendering it more detectable to predators and prey.
      
In the active state, where predators and prey coexist, the classical center singularities with associated population cycles are replaced by either nodes or foci.
      
This finding further demonstrates the importance of predator ecology when examining communication between predators and prey.
      
Tree species influenced the flight response of both predators and prey in the same rank order.
      
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Competition in ecological system can be simulated by certain math-physical models. The existence of limit cycles in the models shows the region of ecological equivalence. Therefore, searching the limit cycles and the limit cycle behaviors exhibited by the models is very important.According to limit cycle theorem with Rosenzweig-Mac Arthur equation on two species competition system, a computational method was used to select initial values. The results of numerical computations demonstrate the existence of a limit...

Competition in ecological system can be simulated by certain math-physical models. The existence of limit cycles in the models shows the region of ecological equivalence. Therefore, searching the limit cycles and the limit cycle behaviors exhibited by the models is very important.According to limit cycle theorem with Rosenzweig-Mac Arthur equation on two species competition system, a computational method was used to select initial values. The results of numerical computations demonstrate the existence of a limit cycle near initial point, which offers a possible explanation for certain regular population oscillations of the predator-prey system : The peak density of the predator and prey are Xmax = Y (1) max = 9l.4031, Y (2) max =77.3508, respectively; and the trough density of the predator and prey are Xmin = Y (1) min = 4.75×10-4, Y(2 )min = 1.7828, respectively. The period of oscillation =4.70

两物种相互作用体系极限环的存在说明两物种出现周期的振荡的消长。极限环的位置标出两物种共存的平衡区域,因此寻找极限环的位置对研究生态平衡有极其重要的意义。本文根据极限环的理论对两物种相互作用生态模型进行环的位置估计,由此来确定Rosenzweig——MacArthur方程的初始值,以便进行数值计算。

According to the theory of predatorprey system in ecology,the author,taking tomato fruit worms as predators and tomato fruit as prey,deals with manyfoundamental relationships on ecology in the paper,namely the funetional res-ponse of predators to their prey density and of their own density effect.The re-lationship between tomato fruitworm and tometo fruit is treated as aspecial typeof relationship between the predator and prey.The results of the experiment sh-ow that...

According to the theory of predatorprey system in ecology,the author,taking tomato fruit worms as predators and tomato fruit as prey,deals with manyfoundamental relationships on ecology in the paper,namely the funetional res-ponse of predators to their prey density and of their own density effect.The re-lationship between tomato fruitworm and tometo fruit is treated as aspecial typeof relationship between the predator and prey.The results of the experiment sh-ow that densities of tomato fruit and tomato fruitworm in per unit of plants aretwo main factors influencing tomato fruitworm boring behaviour.The estimationof the potential number of boring fruit and its be haviour model is proposed as:Na=0.284879N·P/(1+0.036196N)in low population density(0.5 fruitw-orm/4 plants);Na=sum from r=1 to n 0.32046N.Pr~(1-0.49696).N′·P′r/(1+0.036196N)in high populationdensity.

本文将生态学理论中捕食者——猎物的基本关系,即捕食者对猎物密度的功能反应和捕食者对自身密度的反应推广到植食者——植物系统中。把棉铃虫(Heliothio armigera H(?)bner)与番茄果实的关系作为捕食者——猎物关系的的一种特殊形式,用数学模型来评价棉铃虫的蛀果行为和确定棉铃虫的潜在蛀果数。探讨了番茄田棉铃虫蛀果与番茄果实密度、空间复杂程度之间的关系以及棉铃虫幼虫个体间的相互干扰对蛀果数的影响。初步证明:番茄中上部嫩果密度和每单位番茄植株上幼虫密度是影响棉铃虫蛀果行为的两个主要因素,提出了棉铃虫幼虫蛀果行为模式:在低密度下(0.5头/架)其模式为:Na=0.284879NP/(H0.036196N)在高密度时,蛀果行为模式为:Na=sum from r=1 to n(0.32046NPr~(1-0.49696)N'·Pr')/(1+0.036196N)

The spiders, Lycosa pseudoannulata, Pirata subpiraticus, and P. Japonicua were found to be important predators of white-backed planthopper, Sogetella furcifera. through pricipitin tests conducted in Guangzhou. The predators collected in early- and late-planting rice fields were tested for their possitive precipitin reaction to the pest in the laboratory. Then the percentage of the planthoppers killed by the apiders was assessed according to the population levels of both predators and prey in fielda during...

The spiders, Lycosa pseudoannulata, Pirata subpiraticus, and P. Japonicua were found to be important predators of white-backed planthopper, Sogetella furcifera. through pricipitin tests conducted in Guangzhou. The predators collected in early- and late-planting rice fields were tested for their possitive precipitin reaction to the pest in the laboratory. Then the percentage of the planthoppers killed by the apiders was assessed according to the population levels of both predators and prey in fielda during the growing season.

本文介绍应用血清法评价狼蛛对白背飞虱的捕食作用。在早造和晚造两季水稻期间,测定了三种狼蛛捕食白背飞虱的阳性反应率;再根据飞虱和粮蛛当时发生数量,计算出飞虱的被捕食率。

 
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