(Table 1) Species list of benthic decapod crustaceans collected along the Scotia Arc during the cruise ANT-XIX/5 (LAMPOS) in April/May 2002@en

Studies on decapod distribution patterns and reproductive and energetic conditions were carried out along the islands and shallows of the Scotia Arc (Southern Ocean) during the RV \"Polarstern\" LAMPOS expedition (ANT XIX/5) between April and May 2002. A clear biogeographic zonation was found. The Subantarctic Magellan-South Atlantic deca- pod fauna consisting of both \"natant\" (caridean) and \"reptant\" (astacidean, anomuran, and brachyuran) decapods appeared along the northern branch of the Scotia Arc to South Georgia, where Subantarctic and Antarctic faunas were found over- lapping. An impoverished caridean shrimp fauna was found along the islands of the southern branch, from the South Sand- wich Islands to the Antarctic Peninsula. Differences in the reproductive traits of the two most abundant species were detect- ed. The reproductive cycle of Notocrangon antarcticus at South Georgia was more advanced than that at the South Orkney Islands, probably due to temperature differences between the two locations. Although the oogenesis and the reproductive cycle of Munida subrugosa seem to be in phase at Burdwood Bank and in the Beagle Channel, the oocyte number is prob- ably lower at the former location. A new index was used to measure the energy devoted to reproduction by relating the ener- gy contents of the egg mass/ovary plus hepatopancreas and the energy content of the whole body. This index revealed that the energy investment in reproduction was (1) independent of the sampling location, (2) species-specific, and (3) larger in caridean shrimps than in galatheid crabs.2002年4月至5月，科研团队依托“极星号”（RV Polarstern）LAMPOS科考航次（ANT XIX/5），在南大洋斯科舍弧周边的岛屿与浅海海域，针对十足目甲壳动物（Decapoda）的分布格局、繁殖特性与能量状态展开了系统性研究。本研究明确观测到清晰的生物地理分区：亚南极麦哲伦-南大西洋十足目群落涵盖游泳型（真虾下目Caridea）与底栖爬行型（螯虾下目Astacidea、歪尾下目Anomura、短尾下目Brachyura）类群，分布于斯科舍弧北支至南乔治亚岛海域，此处为亚南极与南极动物群落的重叠区域；从南桑威奇群岛至南极半岛的斯科舍岭南支岛屿周边海域，仅存在物种多样性显著降低的真虾类群落。研究同时发现两种优势十足目物种的繁殖特征存在显著差异：南乔治亚岛海域的南极异腕虾（Notocrangon antarcticus）繁殖周期较南奥克尼群岛海域更为超前，推测该差异与两地水温条件不同相关；尽管皱纹铠甲虾（Munida subrugosa）在伯德伍德浅滩与比格尔海峡的卵子发生及繁殖周期均保持同步，但前者的卵母细胞数量大概率更低。本研究采用一种全新的量化指标，通过将卵团/卵巢与肝胰腺的总能量含量与个体整体能量含量进行关联，以此衡量物种用于繁殖的能量投入占比。该指标显示，繁殖能量投入具有如下特征：(1) 与采样地点无关；(2) 具有物种特异性；(3) 真虾类的繁殖能量投入高于铠甲虾类。