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Population distribution, structure and growth condition of Antarctic krill(Euphausia superba Dana) during the austral summer in the Southern Ocean

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【作者】 SHI YongqiangSUN SongLI ChaolunTAO Zhencheng

【Author】 SHI Yongqiang;SUN Song;LI Chaolun;TAO Zhencheng;Key Laboratory of Marine Ecology and Environment Sciences, Institute of Oceanology, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Jiaozhou Bay Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences;

【机构】 Key Laboratory of Marine Ecology and Environment Sciences, Institute of Oceanology, Chinese Academy of SciencesUniversity of Chinese Academy of SciencesJiaozhou Bay Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences

【摘要】 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 refl ects the different distribution pattern between juvenile and adult krill. The population structure of E. superba differed between sea regions, which may affect recruitment.

【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)
【所属期刊栏目】 Articles (2014年03期)
  • 【DOI】10.13679/j.advps.2014.3.00183
  • 【分类号】S932.51
  • 【被引频次】1
  • 【下载频次】24
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