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 ne...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.展开更多
In allusion to the simplification phenomenon of the aquarium equipment on the market,aimed at reducing the labor intensity of the breeder,the intelligent aquatic animal box is designed based on embedded system,its cor...In allusion to the simplification phenomenon of the aquarium equipment on the market,aimed at reducing the labor intensity of the breeder,the intelligent aquatic animal box is designed based on embedded system,its core processor uses STM32F4 and combined with the wireless communication,data processing technology,implement multiple DC motor control. The system uses C language as a design language. and the keil is used as the development environment,and the STM32 library function version of the embedded application development and the STAG emulator are used to the core chip and then debug. The results show that the design can fully realize the function of highly intelligent animals aquarium.展开更多
Sccne:in the aquarium(During summer vacation Blue Mouse,Pink Mouse and Baby Alien goto the aquarium to see the sea animals.Now they are in the aquarium.)
基金Supported by the National Key Research and Development Program of China(No.2018YFC1406801)the National Natural Science Foundation of China(No.41776185)+1 种基金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)
文摘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.
基金supported by the National Key Technology R&D Program(2015BAK06B04)the Key Technologies R&D Program of Tianjin(14ZCZDSF00022,15ZXZNGX00260)the Scientific and Technological Achievements Transformation Cultivation Project of Tianjin University of Technology and Education(ZHPY1602)
文摘In allusion to the simplification phenomenon of the aquarium equipment on the market,aimed at reducing the labor intensity of the breeder,the intelligent aquatic animal box is designed based on embedded system,its core processor uses STM32F4 and combined with the wireless communication,data processing technology,implement multiple DC motor control. The system uses C language as a design language. and the keil is used as the development environment,and the STM32 library function version of the embedded application development and the STAG emulator are used to the core chip and then debug. The results show that the design can fully realize the function of highly intelligent animals aquarium.
文摘Sccne:in the aquarium(During summer vacation Blue Mouse,Pink Mouse and Baby Alien goto the aquarium to see the sea animals.Now they are in the aquarium.)
