Abundance of benthic peracarids sampled in the Atlantic Sector of the Southern Ocean and Weddell Sea during expeditions JR15005, JR275, JR17003a, PS118

Peracarid abundance and composition were studied in the Atlantic Sector of the Southern Ocean and the Weddell Sea at a depth range of 403-2021 m. Samples were collected using an epibenthic sledge (EBS) during expeditions on board the RRS James Clarke Ross in the Filchner Trough (JR275), the South Orkney Islands (JR15005), the Prince Gustav Channel (JR17003a) and on board the RV Polarstern in the Eastern Antarctic Peninsula (PS118). Expeditions took place in February-March 2012, 2016, 2018 and 2019 respectively. Since the trawling distance between stations was not always the same, in order to make data comparable between different stations, numbers of individuals were standardized to 1000 m haul distances.In total 64766 peracarids were found and sorted into five different orders (Amphipoda, Cumacea, Isopoda, Mysidacea and Tanaidacea). Amphipods were the most abundant group representing the 32% of the total abundances. The Filchner Trough had the highest abundance of peracarids, while the South Orkney Islands showed the lowest abundance compared to other areas.

本研究针对南大洋大西洋海域及威德尔海（Weddell Sea）403~2021米水深范围内的囊虾类（Peracarid）丰度与群落组成展开调查。样品采集采用底上拖网（epibenthic sledge, EBS），分别依托英国皇家研究舰詹姆斯·克拉克·罗斯号（RRS James Clarke Ross）在菲尔希纳海槽（JR275）、南奥克尼群岛（JR15005）、古斯塔夫王子海峡（JR17003a）海域，以及极地号研究船（RV Polarstern）在南极半岛东部海域（PS118）开展的科考航次完成。上述科考航次分别于2012、2016、2018及2019年的2—3月实施。由于各采样站位间的拖曳距离并不统一，为保障不同站位间数据的可比性，所有个体数量均被标准化为每1000米拖曳距离对应的个体数。本次调查共采集并鉴定出64766个囊虾类个体，隶属于5个目：端足目（Amphipoda）、涟虫目（Cumacea）、等足目（Isopoda）、糠虾目（Mysidacea）及原足目（Tanaidacea）。端足类为丰度最高的类群，占总个体数的32%。菲尔希纳海槽的囊虾类丰度最高，而南奥克尼群岛的囊虾类丰度在所有调查海域中最低。