中文摘要：

DDT (dichloro-diphenyl-trichloroethane ) 作为 organochlorine 杀虫剂的一种类型，着急地是在水兵上，生态系统是其影响的杀虫剂污染的一个重要部件被评估。在海洋的生态系统上调查 DDT 的生物效果，是的桡脚类的动物在海洋的生态系统的第二等的生产率的主要贡献者，作为目标动物被选择。Sinocalanus tenellus 的喂上的 DDT 的影响，呼吸，幸存，和繁殖(S。tenellus ) 被分析，在个人的抗氧化剂酶活动在 DDT 的不同暴露集中下面被测量。48 h 中部的致命的集中(LC < 潜水艇 class= “ a-plus-plus ” > 50 ) 和 96 h LC < 潜水艇 class= “ a-plus-plus ” > 到 S 的 DDT 的 50 。tenellus 是 5.44 和 2.50 g/dm < 啜 class= “ a-plus-plus ” > 3 , 分别地。过滤评价，擦伤 S 的率，和呼吸。tenellus 与增加的 DDT 集中显然减少了。在更低的集中下面(< 625 ng/dm <啜class=“ a-plus-plus ”>没有任何暴露，在动物的 DDT ，抗氧化剂酶的活动，包括的 superoxide dismutase 和过氧化氢酶的 3 )在动物与那些相比显著地增加了到 DDT ，它建议抗氧化剂酶能保护动物免受氧化损坏的伤害。然而，当动物暴露于更高的集中时，抗氧化剂酶的活动减少了(1 2502 500 ng/dm < 啜 class= “ a-plus-plus ” > DDT 的 3 ) 。当他们暴露于 DDT 时，女性和男性的幸存率被减少不到 250 ng/dm < 啜 class= “ a-plus-plus ” > 3 , 但是当他们在一样的集中下面时，给更高的幸存看的女性比男性评价。孵化比率和 S 的鸡蛋直径。当他们与 25 和 250 ng/dm 的集中暴露于 DDT 时， tenellus 显著地减少了 < 啜 class= “ a-plus-plus ” > 不管多么的 3 , ，累积鸡蛋生产没看任何重要变化动物什么时候暴露于上述 DDT 集中。在预设学习的这些数据建议到 DDT 的暴露能引起桡脚类的动物的种类作文的变化，并且进一步影响海洋的生态系统。

英文摘要：

DDT （dichloro-diphenyl-trichloroethane） as a type of organochlorine pesticides, is an important compo nent of pesticides pollution whose impact on the marine ecosystem is urgently to be evaluated. To investi gate the biological effects of DDT on the marine ecosystem, copepods being the main contributor of sec ondary productivity in the marine ecosystem, were selected as target animals. The influence of DDT on the feeding, respiration, survival, and reproduction of Sinocalanus tenellus （S. tenellus） was analyzed and the antioxidant enzymes activities in the individuals were measured under different exposure concentrations of DDT. The 48 h median lethal concentration （LC50） and 96 h LC50 of DDT to S. tenellus were 5.44 and 2.50 pg/dma, respectively. The filtration rates, grazing rates, and respiration of S. tenellus decreased apparently with increased DDT concentrations. Under lower concentration （〈625 ng/dm3） of DDT, the activities of the antioxidant enzymes, including superoxide dismutase and catalase in the animals increased significantly compared with those in the animals without any exposure to DDT, which suggested that the antioxidant enzymes can protect the animals from oxidative damage. However, the activity of the antioxidant enzyme decreased when the animals were exposed to higher concentration （1250-2 500 ng/dma） of DDT. The sur-vival rate of both females and males was reduced when they were exposed to DDT less than 250 ng/dm3, but females showed higher survival rate than males when they are under the same concentration. The hatching ratio and the egg diameters of S. tenellus decreased significantly when they were exposed to DDT with a concentration of 25 and 250 ng/dm3, however, the cumulative egg production did not show any significant variation when the animals were exposed to the above DDT concentration. These data in the preset study suggested that exposure to DDT can cause the variation of the species composition of copepods, and further affect the marine ecosystem.