Thermal and saline tolerance of Antarctic krill Euphausia superba under controlled in-situ aquarium conditions  

作　　者：ZHU Guoping LIU Zijun YANG Yang WANG Zhen YANG Wenjie XU Liuxiong 

机构地区：[1]College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China [2]Center for Polar Research,Shanghai Ocean University,Shanghai 201306,China [3]National Engineering Research Center for Oceanic Fisheries,Shanghai 201306,China [4]Polar Marine Ecosystem Group,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai Ocean University,Shanghai 201306,China

出　　处：《Journal of Oceanology and Limnology》2019年第3期1080-1089,共10页海洋湖沼学报（英文）

基　　金：Supported by the National Key Research and Development Program of China(No.2018YFC1406801);the National Natural Science Foundation of China(No.41776185);the National Key Technology R&D Program of China(No.2013BAD13B03);the Special Fund for Agro-Scientific Research in the Public Interest of China(No.201203018)

摘　　要：As a key species of the Southern Ocean ecosystem,the thermal and saline tolerances of Antarctic krill(Euphausia superb a Dana)are relatively unknown because of the challenging environment and complicated situations needed for observation have inhibited in-situ experiments in the field.Hence,the thermal and saline tolerance of krill were examined under in-situ aquarium conditions with different controlled scenarios.According to the experiments,the critical lethal times of krill were 24h,2h and 0.5h under 9℃,12℃,and 15℃,respectively,and the estimated 50%lethal times were about 17.1 h and 1.7 h under 12℃and 15℃,respectively.Additionally,the critical lethal times(the estimated 50%lethal times)of krill were approximately 14h and 0.5h(about 22.9 h and 1.7 h)of salinity under 19.7 and 15.9,respectively.The observed critical and 50%lethal times of krill were 0.5 h and approximately 1.4 h,respectively,salinity under 55.2.The critical and 50%lethal temperatures of krill were 13℃and approximately 14.2℃,respectively.Additionally,the critical and 50%lethal salinity was 19.6 and approximately 17.5 for the lower saline(below normal oceanic salinity[34.4])environment and 50.3 and approximately 53.2 for the higher saline(above 34.4)environment,respectively.The upper thermal and saline preferences of krill can be considered 6℃and 26.8 to 41.2,respectively.These results can provide potential scenarios for predicting the possible fate of this key species in the Southern Ocean.As a key species of the Southern Ocean ecosystem, the thermal and saline tolerances of Antarctic krill(Euphausia superba Dana) are relatively unknown because of the challenging environment and complicated situations needed for observation have inhibited in-situ experiments in the field. Hence,the thermal and saline tolerance of krill were examined under in-situ aquarium conditions with different controlled scenarios. According to the experiments, the critical lethal times of krill were 24 h, 2 h and 0.5 h under 9℃, 12℃, and 15℃, respectively, and the estimated 50% lethal times were about 17.1 h and 1.7 h under 12℃ and 15℃, respectively. Additionally, the critical lethal times(the estimated 50% lethal times) of krill were approximately 14 h and 0.5 h(about 22.9 h and 1.7 h) of salinity under 19.7 and 15.9, respectively.The observed critical and 50% lethal times of krill were 0.5 h and approximately 1.4 h, respectively,salinity under 55.2. The critical and 50% lethal temperatures of krill were 13℃ and approximately 14.2℃,respectively. Additionally, the critical and 50% lethal salinity was 19.6 and approximately 17.5 for the lower saline(below normal oceanic salinity [34.4]) environment and 50.3 and approximately 53.2 for the higher saline(above 34.4) environment, respectively. The upper thermal and saline preferences of krill can be considered 6℃ and 26.8 to 41.2, respectively. These results can provide potential scenarios for predicting the possible fate of this key species in the Southern Ocean.

关 键 词：Euphausia superba THERMAL TOLERANCE SALINE TOLERANCE THERMAL PREFERENCE IN-SITU AQUARIUM experiment 

分 类 号：P[天文地球]