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辽东湾4种海洋生物的热耐受性研究
任中华1,2, 宋骏杰1,2, 刘永叶3, 曹 亮1,4
1.中国科学院海洋研究所海洋生态与环境科学重点实验室 青岛 266071;2.中国科学院大学 北京 100049;3.环境保护部核与辐射安全中心 北京 100082;4.青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室 青岛 266071
摘要:
本研究采用动态温升实验方法,以矛尾鰕虎鱼(Chaeturichthys stigmatias)、许氏平鲉(Sebastes schlegeli)、口虾蛄(Oratosquilla oratoria)和日本蟳(Charybdis japonica)为研究对象,研究了5个基础水温(8.0、14.0、18.0、24.0和28.0℃)和9个温升速率(0.5、1.0、2.0、3.0、4.0、6.0、9.0、12.0和15.0℃/h)下4种海洋生物的半致死温度(Lethal temperature of 50%,LT50)。结果显示,基础水温和温升速率均能显著(P<0.05)影响实验生物的LT50。特定温升速率下实验生物LT50与基础水温呈正相关,即各个实验生物的LT50随着基础水温的升高而升高。温升速率对实验生物LT50的影响因基础水温和物种而异。本研究在动态温升实验中结合使用不同基础水温和多个温升速率,构建了海洋生物重要的热耐受性评价指标LT50,可广泛应用于海洋生物的热耐受性评价。
关键词:  海洋生物  动态温升实验  半致死温度(LT50)  基础水温  温升速率
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An Experimental Study on Thermal Tolerance of Four Marine Species in Liaodong Bay
REN Zhonghua1,2, SONG Junjie1,2, LIU Yongye3, CAO Liang1,4
1.Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071;2.University of Chinese Academy of Sciences, Beijing 100049;3.Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082;4.Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071
Abstract:
In recent years, global warming and the release of hot wastewater from nuclear power plants have caused the temperature of sea water to rise, leading to severe thermal pollution of the oceans. Marine ecosystems and the survival of marine life face huge challenges from ocean warming. Research on the thermal tolerance of marine organisms will help us to understand the heat tolerance of different marine species and determine how to control thermal discharge from nuclear power plants. This study investigated the heat tolerance of four marine species (Chaeturichthys stigmatias, Sebastes schlegeli, Oratosquilla oratoria, and Charybdis japonica) in Liaodong Bay using a dynamic temperature-rising test. The lethal temperature of 50% (LT50) was assessed at five acclimation temperatures (8.0℃, 14.0℃, 18.0℃, 24.0℃, 28.0℃) and nine temperature-rising rates (0.5, 1.0, 2.0, 3.0, 4.0, 6.0, 9.0, 12.0, 15.0℃/h) to evaluate heat tolerance. The results showed that both the acclimation temperature and temperature-rising rate significantly affected the LT50 value of the experimental animals (P<0.05). The LT50 values were significantly positively correlated with the acclimation temperature (P<0.05), while the effects of the temperature-rising rate varied with acclimation temperature in a species-dependent manner. In this study, the dynamic temperature-rising test included a higher number of acclimation temperatures and temperature-rising rates than used in previous studies, and we established the LT50 value as an important indicator for evaluating the heat tolerance of marine species. These results suggest that as an evaluated index, LT50 comprehensively reflects the heat tolerance of experimental species, which is of scientific and ecological significance and could be widely used in the assessment of heat tolerance.
Key words:  Marine species  Dynamic temperature-rising test  Lethal temperature of 50% (LT50)  Acclimation temperature  Temperature-rising rate