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predators
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  捕食性天敌
    In the same trophic level, the productivity showed significant positive relation with its species richness in both insect pests community and predators community.
    在同一营养层中,害虫群落、捕食性天敌群落的生产力和其群落物种丰富度指数呈正相关,且随着播种日期的推后,这种相关性在单作棉田中增强,而在套作棉田中则有所降低。
    Fuzzy cluster analysis of the cotton aphid and its predators in Chinese prickly ash orchard
    花椒园棉蚜及其捕食性天敌动态的模糊聚类分析
短句来源
    The total of 88 species of arthropods, including 15 species of pests,47 species of predators, 13 species of parasitoids, 13 species of neural arthropods were collected in cotton field.
    棉田共采集节肢动物88种,害虫15种,捕食性天敌47种,寄生性天敌13种,中性节肢动物13种。
短句来源
    The population of predators could be clustered into 7 clusters(λ=0.8000).
    其捕食性天敌的调查结果同样聚为7类,λ=0.9400。
短句来源
    POPULATION DYNAMICS OF PREDATORS AND THEIR CONTROLLING FUNCTION TO PESTS IN COTTON FIELDS
    棉田捕食性天敌种群动态及其对害虫的控制功能
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  天敌
    The study shows:(1)the sorts, numbers and formation of insects and their predators insoybean are different with the cropping patterns of early and late soybean.
    研究大豆不同种植方式对大豆害虫及其天敌种类和数量关系的结果指出:(1)大豆地的大豆害虫及其天敌种类、数量和组成,随早、晚大豆种植方式的不同而不同;
短句来源
    STUDY ON THE ECONOMIC THRESHOLD OF THE THIRD GENERATION OF COTTON BOLL WORM BY TAKING ACCOUNT OF THE INCIDENCE OF PREDATORS
    考虑天敌因素的三代棉铃虫防治指标研究
短句来源
    PACKAGED TECHNIQUES FOR THE PROTECTION AND USE OF THE NATURAL PREDATORS ON THE CONTROL OF LOCUSTA MIGRATORIA MANILENSIS
    鲁北地区东亚飞蝗天敌保护利用配套技术
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    2. The amounts of predation of the main predators were determined respectly. Theadjusted predation equivalency coefficients of different predators were calculated basedon the amount of potential predation of each species. Thus, the predation equivalencysystems were established.
    2.本文对小菜蛾主要捕食性天敌的捕食量分别进行了测定,根据每种天敌的潜在捕食量,计算了每种天敌不同发育阶段的校正捕食当量系数,建立了小菜蛾主要捕食性天敌的捕食当量系统。
短句来源
    6. The descending sort of groups of arthropod was predators, insect pests, parasitoids and neutral insects by the similarity degree of arthropod groups between weed habitat and paddy habitat. The arthropod community in the weed habitat plays more important role as a "natural enemy pool" than as a "pest pool".
    6.杂草地生境和稻田生境节肢动物群落的害虫、捕食性天敌、寄生性天敌和中性昆虫亚群落的相似程度为捕食性天敌>害虫>寄生性天敌>中性昆虫。 杂草地生境的节肢动物群落作为稻田天敌种库的作用大于作为害虫种库的作用。
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  “predators”译为未确定词的双语例句
    Advance in gut analysis of predators with molecular methods
    应用分子方法进行捕食者中肠分析的研究进展
短句来源
    1. The structure and dynamics of the arthropod community in orchards was investigated, identified, classified and analyzed from 2001 to 2003 in Shanxi. 178 species belonged to 4 classes, 19 orders and 86 families were discovered in the orchards, including 18 species of predators representing 9 families, 6 orders; 68 species of spiders representing 14 families;
    1.于2001~2003 年对山西晋中、晋南和晋北5 类果园进行节肢动物群落结构的调查研究,共发现节肢动物178 种,分属4 纲19 目86 科,其中捕食性昆虫6 目9 科18种,捕食性蜘蛛1 目14 科68 种,寄生类2 目6 科14 种,植食类7 目49 科69 种,中性类1 目6 科6 种,其它节肢动物2 种;
短句来源
    in November was the lowest,0.1509. The relative abundance of predators was 0.O4062,the value during April to October was 0.02015-0.19537;
    捕食类总群落相对丰盛度为0.04062,4—10月份为0.02015—0.19537,11月份最高,为0.84091。
短句来源
    The result of the predators sub-community was 4.18-5.21,6.23 and 720-11.17.
    捕食类节肢动物亚群落时间格局的最优分割为4.18~5.21,6.23,7.20~11.17等3段。
短句来源
    1.By systematical investigation on the arthropod community in jujube orchard between march and October in 2003,there were 11472 individuals of arthropod in jujube orchard which belong to 86 families, 200 species ,the arthropod community were divided into four sub-community,which were phytophages,predators,parasitoids and neutralities,the phytophages which include 46 families,111 species, the predators which include 25 families,59 species, the parasitoids which include 10 families,24 species,were collected,
    1.作者于2003 年3-10 月对山西太谷枣园节肢动物群落进行了系统调查,在实验枣园内共采集到节肢动物11472 头,经初步整理鉴定,隶属86 科200 种,其中植食性类群46 科111 种,捕食性类群25 科59 种,寄生性类群10 科24 种。
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  predators
Global asymptotic stability of the periodic Lotka-Volterra System with two-predators and one-prey
      
The three species Lotka-Volterra periodic model with two predators and one prey is considered.
      
They are generalist predators and thus may affect native species through predation.
      
The results indicate that bullfrogs exert different predatory influences on native fauna at different sites and that bullfrogs are generalist predators with extensive ecological impacts on native fauna.
      
We think that the overlong-chain aldehydes defend the sponge from fouling and predators.
      
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Aooloearia mirabilis(motschulsky) (Coleoplera, tacinellidae) is a kind of important predators, which occurs for 2 generations each year in jilin Province. adult of this ladybird eats the eggs of chrysomelidae, and its larva eats the rggs and larvae of chrysomelidee. If over wintered at the adult period. The Present paper reports the morphological characteristics and biological properties of Aiolocaria mirabilis in detail.

奇变瓢虫Aiolocarianurabilis(Motschulsky)属鞘翅目瓢部甲科。是榆紫金花虫的一种重要的捕食性天敌。该虫在吉林省一年发生2代,成虫取食榆紫金花虫的卵,幼虫取食榆紫金花虫的卵和幼虫,以成虫越冬。本文详细报道了奇变瓢虫的形态特征和生物学特性。

he developmental rate, survival and age--specific fecundity of Cyrtorhinus lividipennis (REUTER), an important egg predator of the rice planthoppers, fed oneggs of white--backed planthopper (Sogatella furcilera Horvath), were determinedunder various constant temperatures from 17 --33 and with different food. Thedevelopmental rate curve of this predator is in the shape of a sigmoid. The developmental threshold and thermal constant were estimated to be 9.83 and 359.05 day--degree, respectively. The...

he developmental rate, survival and age--specific fecundity of Cyrtorhinus lividipennis (REUTER), an important egg predator of the rice planthoppers, fed oneggs of white--backed planthopper (Sogatella furcilera Horvath), were determinedunder various constant temperatures from 17 --33 and with different food. Thedevelopmental rate curve of this predator is in the shape of a sigmoid. The developmental threshold and thermal constant were estimated to be 9.83 and 359.05 day--degree, respectively. The generation survival (Y1), the intrinsic rate of capaci-ty of increase(Y1) and the total eggs laid per female (Y1)were higher at 21 --29, which can be described by following equations, Y1 = exp(-3.0031 + 0.5223X-0.0105X2), Y2 = -0.5971+ 0.0535X-0.0010X2,and Y3= exp(- 12.0791+ 1.3869X-0.0278X2), where X is the temperature in The optimum temperature for the population growth is 26.00 with a maximum finite rate of increase of 1.1044.On average, the number of eggs laid per female are 247.63 74.73, 237.25 18.62, 196.83 69.08 and 128.14 81.29, when fed with BPH egg, WBPH egg, BPHyoung nymph and WBPH young nymph, respectively. However, the developmentalrate and longevity are not significantly affected by these prey. Egg hatchability is59.83, 58.26, 44.35, and 46.96, respectively. Therefore, BPH egg is the best foodof Cyrtorhinus lividipennis.

黑肩绿盲蝽Cyrtorhinus lividipennis(Reuter)取食白背飞虱卵时,其未成熟期的发育速率与温度呈逻辑斯蒂曲线,世代发育起点和有效积温分别为9.83℃,359.05日度。在21—29℃时,世代存活率、Y种群内禀增长力Y2和成虫产卵量Y3粒/雌)较高,高低温区均呈下降趋势,各参数与温度X的关系方程分别为Y1=exp(-3.0031+0,5223X—0.0105X2),Y2=-0.5971+0.0535X—0.0010X2,Y3=exp(-12.0791+1.3869X—0.0278X2)。理论上26℃时周限增长率最大,达1.1044倍/天。以褐飞虱卵、白背飞虱卵、褐飞虱低龄若虫和白背飞虱低龄若虫四种食物作为猎物下,黑肩绿盲蝽成虫的产卵量分别为247.63±74.73、237.25±118.62、196.83±69.08、128.14±81.29粒/雌,其卵孵化率分别为59.83、58.26、44.35、46.96%。结果表明,褐飞虱卵是黑肩绿盲蝽发育、存活和繁殖的适宜食物。

hrough the predation of lady bird(Coccinella septempunctata)larva to two species ofwheat aphid (Macrosiphum avenae and Rhopalosiphum padi),the present paper examined therelationships of the amount of feeding to the development rate and the growth rate of thepredators in different prey densities。The results show that the relationships of the biomassof the aphids consumed to the development rate and the growth rate of the predators are bothlinear。 Thus this coincides with Beddington’smodel.The prey density...

hrough the predation of lady bird(Coccinella septempunctata)larva to two species ofwheat aphid (Macrosiphum avenae and Rhopalosiphum padi),the present paper examined therelationships of the amount of feeding to the development rate and the growth rate of thepredators in different prey densities。The results show that the relationships of the biomassof the aphids consumed to the development rate and the growth rate of the predators are bothlinear。 Thus this coincides with Beddington’smodel.The prey density and the growth rate oflady bird larva can be fitted to logistic model.The optimal feeding amotint and the optimalfeeding density of the predator upon the two species wheat aphid were also calculated,re-spectively and compared with predation effects on two wheat aphids,and the optimalforaging strategy then was elucidated prelimin rily。

本文研究了七星瓢虫各龄幼虫在不同麦蚜密度下的捕食量与其发育速率和增长率的关系。结果表明:七星瓢虫各龄幼虫的捕食量与其发育速率和增长率均为线性关系,符合Beddington模型;猎物密度与各龄瓢虫的增长率皆呈逻辑蒂斯曲线增长;求出了捕食者对两种麦蚜的最佳捕食量和最佳猎物密度;比较了捕食者对两种麦蚜的捕食作用差异。

 
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