| XU Donghui,LIU Guangxing. 2014. The effects of DDT on the feeding, respiration, survival, and reproduction of Sinocalanus tenellus (Copepoda: Calanoida). Acta Oceanologica Sinica, 33(9):133－138 |
| The effects of DDT on the feeding, respiration, survival, and reproduction of Sinocalanus tenellus (Copepoda: Calanoida) |
| DDT对细巧华哲水蚤（Sinocalanus tenellus）摄食、呼吸、存活和生殖的影响研究 |
| Received:March 28, 2013 Revised:October 16, 2013 |
| DOI：10.1007/s13131-014-0524-4 |
| Key words:DDT Sinocalanus tenellus survival reproduction feeding respiration antioxidant enzyme |
| 中文关键词: DDT 细巧华哲水蚤 存活 生殖 摄食 呼吸 抗氧化酶 |
| 基金项目:The National Natural Science Foundation of China under contract No. 40876066; the Young Scientists Fund of the National Natural Science Foundation of China under contract No. 41106095. |
| Author Name | Affiliation | E-mail | | XU Donghui | College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China | | | LIU Guangxing | College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
Key Laboratory of Marine Environment & Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China | gxliu@ouc.edu.cn |
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| Abstract: |
| DDT (dichloro-diphenyl-trichloroethane) as a type of organochlorine pesticides, is an important component of pesticides pollution whose impact on the marine ecosystem is urgently to be evaluated. To investigate the biological effects of DDT on the marine ecosystem, copepods being the main contributor of secondary 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 μg/dm3, 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 (1 250-2 500 ng/dm3) of DDT. The survival 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. |
| 中文摘要: |
| DDT作为一种有机氯农药，其对海洋生态系统的影响亟待评估。通过将海洋生态系统中次级生产力的重要组成部分桡足类作为目标生物，来评估DDT对海洋生态系统可能造成的生物效应。结果表明：DDT对细巧华哲水蚤的48 hLC50和96 hLC50 分别为5.44 μg/dm3和2.50 μg/dm3；随着DDT浓度的升高（156~2500 ng/dm3），细巧华哲水蚤的摄食率和呼吸率呈明显下降趋势，细巧华哲水蚤的SOD和CAT活性总的呈现下降趋势，低浓度处理组中的SOD和CAT活性与对照组相比有所升高，高浓度处理组的SOD和CAT活性与对照组相比明显下降；随着DDT浓度的升高（2.5~250 ng/dm3），除DDT2.5 ng/dm3浓度组外，其它浓度DDT均引起细巧华哲水蚤的孵化率和卵径的显著降低；各浓度的DDT对细巧华哲水蚤的累积产卵率和存活率均未造成显著影响。研究表明，DDT暴露可以导致桡足类种类组成的变化，并进一步影响整个海洋生态系统。 |
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