桡足类

The species of cladoceran and copepod in Shiquan River are fewer. From the specimens we observed 5 families 8 genus 18 species of cladoceran and the dominant species are A. sp and Chydrorus sp. Copepoda had 2 orders 8 species.

狮泉河的枝角类和桡足类种类很少，所采样品仅检出枝角类5科8属18种，优势种类为尖额溞和盘肠溞；桡足类2目8种。

A model is developed to analyze the tradeoff between benefits and costs involved in the strategies for the normal dvm of copepod . the venturous revenue is used as the criterion for this optimal tradeoff . it is a function of the environmental factors and the age of copepod

本文提出一个桡足类常规的昼夜垂直迁移模型，以分析桡足类在垂直迁移的决策过程中对利益和风险的权衡机制，风险收益被用来作为这种权衡机制的优化目标，它是环境因子和桡足类年龄的函数。

Dilution the effect of copepod addition incubations were conducted in Xiamen Baozhu waters on November 16 and 27 in order to study the impact of microzooplankton and copepods grazing on the growth of phytoplankton.

2005年11月16日和27日，运用稀释法和桡足类添加法，对厦门宝珠屿海域小型浮游动物及桡足类的摄食对浮游植物生长的影响进行了研究。

However, the metals showed their neurotoxcity, more by enhancing the activity of AChE in copepod. Nevertheless, after 12 d exposure of Cd or Ni, at more extent, MDA level in copepods are little correlated with metal treatments.

同时，镉和镍对桡足类均有神经毒性效应，因为不同浓度重金属均诱导桡足类体内AChE活性的显著变化，但重金属更多是通过AChE活性的提高而呈神经毒性。

Nutrient-enriched reservoirs support greater abundance and biomass of copepods. However, dominance of Calanoids was lower while dominance of cyclopoids, copepodids and nauplius were much higher in the nutrient-enriched reservoirs.

随着水库营养水平的升高，桡足类密度和生物量也相应增加，但是大型哲水蚤的优势度降低，而剑水蚤和桡足类幼体的优势度上升。

A total of 20 groups of meiofauna in the Southern Yellow Sea: Nematoda, Copepoda, Polychaeta, Kinorhyncha, Bivalvia, Ostracoda, Amphipoda, Tanaidacea, Isopoda, Cumacea, Gastropoda, Gastrotricha, Halacaroidea, nectochaeta, Amphiura, Nemertina, Insecta, Priapulida, Turbellaria and others were identified.

共鉴定出自由生活线虫、底栖桡足类、多毛类、动吻类、双壳类、介形类、端足类、异足类、等足类、涟虫类、腹足类、腹毛类、海螨类、疣足幼体、蛇尾类、纽虫类、昆虫类、曳鳃动物、涡虫类和其它类等20个小型底栖动物类群，小型底栖动物的平均丰度为(1186.12±486.07)ind.10cm~(-2)，其中海洋线虫占绝对优势，其平均丰度为(1063.97±469.98)ind.10cm~(-2)，占小型动物总丰度的89.702%；其次是底栖桡足类，占4.193%。

Is following to executes the medicine for a long time, the initial 1ppm Dibaichong may effective kill , develops the present 10ppm Dibaichong to kills extinguishes the effect is not very obvious, is following Dibaichong density elevating, the antibiotic nature unceasingly enhances, the trepang abalone's quality unceasingly drops!

伴随着对桡足类的长期施药，最初的1ppm的敌百虫可以有效的杀死桡足类，发展到现在10ppm的敌百虫对桡足类的杀灭效果也不是很明显，伴随着敌百虫浓度的升高，桡足类抗药性不断提高，海参鲍鱼的质量不断下降！

In this study, copepoda and its resting eggs in shrimp culture ponds were detected using PCR dot-blot hybridization and nest-PCR for the presence of WSSV. The results showed that WSSV positive cases were detected in copepoda from egg to adult, and the positive copepoda appeared earlier than cultural shrimp in ponds.

1。本研究利用PCR-斑点杂交和巢式PCR法检测野外发病对虾养殖池塘中桡足类及其休眠卵，以及由这些休眠卵孵化出的幼体携带病毒情况，发现桡足类由卵到成体各阶段中均有阳性个体，而且池塘中在春天放养对虾苗前桡足类就出现阳性个体。

This paper reviewed the physiological responses to the toxicity of heavy metals and the accumulation of metals in copepods, in addition of trophic transfer.

综述了近20a来重金属对桡足类影响的研究进展，包括重金属对桡足类的毒性和生理效应，重金属在桡足类体内蓄积及桡足类体内重金属的食物链传递。

We also point out some directions for further study, including the toxic speciation of heavy metals in copepods, the physiological and biochemical effects of dietborne metals, and further more, the impacts of heavy metals on copepods life history.

并指出今后的研究重点：桡足类体内致毒重金属的存在形式，重金属食物暴露对桡足类生理生化影响机理，以及重金属对桡足类生活史的影响。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。