查询词典 predators

Based on the studies conducted by some authors at home and abroad, our paper describe the morphological characteristics of beak and review the studies of beaks that applied in Cephalopod biology, taxonomy, stock estimation and feeding habits of predators.

本文根据国内外学者对其研究的成果，系统描述了角质颚的形态特征，对其在头足类生物学和分类地位、资源量估算、捕食动物的食性分析等方面的应用研究做了综述。

The chub were well adapted to the poor visibilitycreated by the thick, red water which gave the river its name, and depended onit to hide from predators.

弓背鮭非常适应浑浊红色的河水中的低可见度，并可以借以躲避天敌。

Their predators are not well documented, but the dolphinfish is known to feed on immature Cobia.

没有好介绍天敌，但 dolphinfish 知道是对未成熟因数。

In this paper, a non-autonomous predator-prey system with two commensal predators and one prey is studied.

研究了非自治的捕食者－食饵模型。该系统是两个具有互惠关系的捕食者种群捕食一个食饵种群。

Making use of the comparison theorem, some sufficient conditions are derived for permanence of the system and non-permanence of predators.

运用比较定理，得到了系统持久生存和捕食者灭绝的充分条件。

By using of the comparison theorem and some results, some sufficient and necessary conditions are derived for permanence of the periodic system and non-permanence of predators.

运用比较定理和一些主要结果，得到了系统永久持续生存和捕食者灭绝的充分必要条件。

While they have intelligence enough to defend the hive from natural predators, they prove easily conquerable by more sharp-witted foes.

虽然他们有足够的智能可以保护虫群免於自然掠食者的侵害，但也很容易被更聪明的敌人征服。

There are also costs of belonging to a group: increased competition for food, increased conspicuousness to predators, increased risk of disease.

作为集群的一员也有弊处：增加竞争食物的强度、更易引起捕食者的注目、提高感染疾病的风险。

Grouping – costs There are also costs of belonging to a group: increased competition for food, increased conspicuousness to predators, increased risk of disease.

集群——代价作为集群的一员也有弊处：增加竞争食物的强度，更易引起捕食者的注目，提高感染疾病的风险。

Trichogramma showed high control efficacy on cotton bollworm eggs after three times of release both in the second and in the third generation bollworm periods. The parasitism on the second and third generation bollworm eggs were 66.0%-70.7% and 76.0%-81.2%, respectively, which were significantly higher than that in the control (second generation: 7.0%-12.3%, third generation: 5.2%-7.4%). And the injury rate of cotton buds and bolls in the second and third generation bollworm were 2.2% and 3.1%, respectively, which were significantly lower than that in the control (second generation:8.5%, third generation: 20.9%). In the second generation bollworm period, number of bollworm eggs or larvae in the Trichogramma released cotton field did not differ to that in the chemically controlled field. But in the third generation, there were significantly less bollworm eggs and larvae in the Trichogramma released cotton field. There were more predators in the Trichogramma released cotton field. These results indicated that cotton boll worm in the transgenic insect-resistant cotton field can he effectively controlled by mass-releasing of T.

结果发现：棉铃虫卵在棉株不同部位的分布差异较大，2代棉铃虫卵主要分布在叶正面、叶背面和茎尖，3代棉铃虫卵主要分布于蕾铃；在放蜂田，赤眼蜂对棉株不同部位棉铃虫卵的寄生率差异较大，2，3代棉铃虫时期对叶正面、叫背面、茎尖、蕾铃的棉铃虫卵寄生率均较高，对叶柄和茎杆处卵的寄生率较低；并以3代棉铃虫时期的寄生率较高；在2，3代棉铃虫时期分别连续释放3次赤眼蜂，对棉铃虫具有很强控制作用，2，3代棉铃虫卵的被寄生率分别为66.0%~70.7%和76.0%~81.2%，均显著高于化防田的自然寄生率（2代：7.0%~12.3%，3代：5.2%~7.4%）；蕾铃被害率分别为2.2%和3.1%，均显著低于化防田（2代：8.5%，3代：20.9%；2代棉铃虫时期，放蜂田和化防田的棉铃虫卵量和幼虫数量差异均不显著，但3代棉铃虫以后，放蜂田棉铃虫卵量和幼虫数量均显著低于化防田，且放蜂田的捕食性天敌数量显著高于化防田。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了