Antarctic krill （Euphausia superba Dana） was collected using a High Speed Collector and an Isaac-Kidd midwater trawl （IKMT） net during the austral summer of 2007/2008 and 2008/2009 in the circumpolar and Prydz Bay...Antarctic krill （Euphausia superba Dana） was collected using a High Speed Collector and an Isaac-Kidd midwater trawl （IKMT） net during the austral summer of 2007/2008 and 2008/2009 in the circumpolar and Prydz Bay regions of the Southern Ocean, respectively. Combined with the simultaneous recording of environmental factors, spatial distribution, population structure and growth condition of E. superba were studied. The abundance of E. superba in the Weddell Sea was higher than in Prydz Bay. However, the abundance of E. superba in both the Weddell Sea and Prydz Bay was lower than figures reported in previous krill surveys for the same time period. With respect to the total study area, E. superba displayed a normal growing state during the two expeditions. E. superba grew relatively poorly in some stations, which may be due to the late retreat of sea ice or lower chlorophyll a concentrations. The number of juvenile E. superba collected using the High Speed Collector was proportionally greater in stations located at the edge of the sea ice, while adults dominated in long-term non-ice regions. This phenomenon reflects the different distribution pattern between juvenile and adult krill. The population structure of E. superba differed between sea regions, which may affect recruitment.展开更多
Replica platings among 9 species bacteria isolating from the stems, branches and leaves of poplar infected by INA bacterial canker were made.They are the pathogen Pantoea agglomerans , 7 species of Bacillus , and Pseu...Replica platings among 9 species bacteria isolating from the stems, branches and leaves of poplar infected by INA bacterial canker were made.They are the pathogen Pantoea agglomerans , 7 species of Bacillus , and Pseudomonas syringa . Results showed that the majority of poplar inhabiting bacteria are interspecific symbiont, the minority have antagonistic action in interspecies. It provided basic studies for further explore the roles of the poplar inhabiting bacteria in natural contracting of poplar bacterial canker, and also further select antagonistic microbe for effective biocontrol to poplar bacterial canker.展开更多
基金supported by the Polar Research Strategy Foundation of China (Grant no. 20120308)the Chinese Polar Environment Comprehensive Investigation & Assessment Programmes (Grant nos. CHINARE2013-01-06 and CHINARE2013-01-05)
文摘Antarctic krill （Euphausia superba Dana） was collected using a High Speed Collector and an Isaac-Kidd midwater trawl （IKMT） net during the austral summer of 2007/2008 and 2008/2009 in the circumpolar and Prydz Bay regions of the Southern Ocean, respectively. Combined with the simultaneous recording of environmental factors, spatial distribution, population structure and growth condition of E. superba were studied. The abundance of E. superba in the Weddell Sea was higher than in Prydz Bay. However, the abundance of E. superba in both the Weddell Sea and Prydz Bay was lower than figures reported in previous krill surveys for the same time period. With respect to the total study area, E. superba displayed a normal growing state during the two expeditions. E. superba grew relatively poorly in some stations, which may be due to the late retreat of sea ice or lower chlorophyll a concentrations. The number of juvenile E. superba collected using the High Speed Collector was proportionally greater in stations located at the edge of the sea ice, while adults dominated in long-term non-ice regions. This phenomenon reflects the different distribution pattern between juvenile and adult krill. The population structure of E. superba differed between sea regions, which may affect recruitment.
文摘Replica platings among 9 species bacteria isolating from the stems, branches and leaves of poplar infected by INA bacterial canker were made.They are the pathogen Pantoea agglomerans , 7 species of Bacillus , and Pseudomonas syringa . Results showed that the majority of poplar inhabiting bacteria are interspecific symbiont, the minority have antagonistic action in interspecies. It provided basic studies for further explore the roles of the poplar inhabiting bacteria in natural contracting of poplar bacterial canker, and also further select antagonistic microbe for effective biocontrol to poplar bacterial canker.
