Effects of residual chlorine on the mortality, grazing and respiration of Labidocera euchaeta (Copepoda) |
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Authors: | MA Zengling LIN Hongping GU Xiaolian and XU Zhaoli |
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Institution: | 1.Key and Open Laboratory of Marine and Estuary Fisheries(Ministry of Agriculture), East China Sea Fisheries Research Institute, Chinese Academy of Fisheries Science, Shanghai 200090, China2.Institute of Life Science and Technology, Zhanjiang Normal University, Zhanjiang 524048, China |
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Abstract: | In this study, the authors investigated the effects of residual chlorine on mortality, grazing and
respiration of Labidocera euchaeta in laboratory. The grazing rate was evaluated by subtraction
method of food concentration and respiration rate was measured using oxygen electrode. It was
found that the lethal effect of residual chlorine on L. euchaeta increased with enhanced concentration
and prolonged duration. The medium lethal concentration (LC50) of chlorine for L. euchaeta in
24 h was about 0.58 mg/L and the safe concentration was about 0.21 mg/L. However, the grazing
and respiration of L. euchaeta decreased by 32.6% and 18.9% when exposed to 0.2 mg/L residual
chlorine for 4 h. It indicated that the physiological activities of zooplankton could be suppressed by
the residual chlorine less than the safety concentration. Therefore, both survival and physiological
activities of the organisms living in the thermal (nuclear) power plant discharging waters should be
considered when carrying out the ecological risks assessment. |
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Keywords: | copepod grazing Labidocera euchaeta residual chlorine respiration zooplankton |
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