Zooplankton around Marion and Prince Edward Islands; 24 March 1976 to 25 November 1976 (NODC Accession 0000940)

Samples of zooplankton taken at 12 stations around Marion and Prince Edward Islands (47oS - 35oE) in March 1976 from the 'Marion-Dufresne' and at 2 stations in the same area in November 1976 from the 'R.S.A.' have been studied. Twenty species of Copepoda and a number of other organisms are recorded. The copepod community represented is Antarctic rather than sub-antarctic in character in some respects. It is suggested that this peculiar species composition may result from the upwelling of water from deeper levels in the lee of the islands. The greatest numbers of organisms per cubic meter of water is recorded in areas between 100 and 175 meters deep. Some species show evidence of vertical migration. Zooplankton biomass ranged from 8.7 to 34.9 mg/m3 with a mean of 18.3 mg/m3 for vertical hauls ranging from 30-0 m to 300-0 m with a 50 cm diameter WP II net.本数据集基于1976年3月依托"马里恩-迪弗雷讷"号（Marion-Dufresne）考察船，在马里恩岛与爱德华王子群岛（47°S，35°E）周边12个站位采集的浮游动物样本，以及1976年11月依托"R.S.A."号考察船在同一区域2个站位采集的同类样本构建。研究共记录桡足类（Copepoda）20种及多种其他类群生物。在所采集的桡足类群落中，部分类群的群落特征在一定程度上更偏向南极海域类群，而非亚南极（sub-antarctic）类群。研究推测，这种特殊的物种组成可能源于群岛背风侧深层海水的上升流活动。每立方米水体中生物丰度最高的区域集中于水深100~175米的水层。部分物种存在垂直迁移现象。采用直径50厘米的WP II型浮游生物网开展30-0米至300-0米的垂直拖网采样后，测得浮游动物生物量介于8.7~34.9 mg/m³之间，平均值为18.3 mg/m³。