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Tolerance of copepods to short-term thermal stress caused by coastal power stations
Authors:Zhibing Jiang  Jiangning ZengQuanzhen Chen  Yijun HuangXiaoqun Xu  Yibo LiaoLu Shou  Jingjing Liu
Institution:Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Abstract:The tolerance of marine copepods to short-term thermal stress was measured by the median lethal temperature (LT50) tests in laboratory. Experiments on LT50 of copepods from different acclimation and acclimatization conditions collected from the Yueqing Bay were carried out under heat exposure for 15, 30 and 45 min. The LT50 of copepods decreased with increasing exposure time but increased with rising acclimation and acclimatization temperatures. However, the differences in copepod LT50 decreased with rising acclimatization temperatures, which suggested that entrained copepod mortality increased with raised water temperature due to the acute thermal stress of coastal power stations. Results also revealed that the thermal tolerance of Labidocera euchaeta was much higher than that of Calanus sinicus in spring. The thermal tolerances of different copepod species in summer were in the order, Pseudodiaptomus marinus, Acartia spinicauda, Acartia pacifica and L. euchaeta.
Keywords:Marine copepods  Thermal tolerance  Median lethal temperature (LT50)  Temperature increase  Acute thermal stress  Acclimation temperature  Acclimatization temperature  Zooplankton  Cooling system
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