Distribution of the Planktonic Shrimp Lucifer (Thompson, 1829) (Decapoda, Sergestoidea) off the Amazon

Lucifer faxoni (BORRADAILE, 1915) and L. typus (EDWARDS, 1837) are species first identified in the neritic and oceanic waters off the Amazon. Samplings were made aboard the vessel “Antares” at 22 stations in July and August, 2001 with a bongo net (500-µm mesh size). Hydrological data were taken simultaneously for comparative purposes. L. faxoni was present at thirteen of the fourteen neritic stations analysed, as well as at five of the eight oceanic stations. L. typus was present at three of the fourteen neritic stations and in one of the eight oceanic stations. The highest density of L. faxoni in the neritic province was 7,000 ind.m–3 (St. 82) and 159 ind.m–3 (St. 75) in the oceanic area. For L. typus, the highest density observed was 41 ind.m–3 (St. 64) in the neritic province. In the oceanic province, the highest single density value was recorded at station 75 (5 ind.m–3). Overall, L. faxonitypically presented the highest densities.

法氏莹虾（Lucifer faxoni，BORRADAILE，1915）与典型莹虾（Lucifer typus，EDWARDS，1837）为首批在亚马逊近海及远洋海域被鉴定定名的物种。2001年7月至8月，研究人员搭乘"Antares"号考察船，使用网目孔径为500微米的邦戈拖网（bongo net），在22个采样站位开展浮游生物采样作业，并同步采集水文环境数据以用于对照分析。经统计分析，14个近海站位中有13个站位采获法氏莹虾，8个远洋站位中有5个站位检出该物种；典型莹虾则仅在14个近海站位中的3个站位，以及8个远洋站位中的1个站位被采获。法氏莹虾在近海海域的最高种群密度为7000 个/立方米（站位82），在远洋海域的最高种群密度为159 个/立方米（站位75）；典型莹虾在近海海域的最高观测密度为41 个/立方米（站位64），其在远洋海域的最高单站位密度记录于站位75，为5 个/立方米。总体而言，法氏莹虾的种群密度通常显著高于典型莹虾。