Geographical distribution and age composition of Euphausia superba larvae (Crustacea: Euphausiacea) in the South Shetland Islands region and southern Scotia Sea in relation to environmental conditions

作     者：GAO Qian XU Zhaoli HUANG Hongliang CHEN Xuezhong FENG Chunlei LI Lingzhi 

作者机构：Key and Open Laboratory of Marine and Estuarine FisheriesMinistry of AgricultureEast China Sea Fisheries Research InstituteChinese Academy of Fishery Sciences 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2013年第32卷第11期

页      面：59-67页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0908[农学-水产] 0707[理学-海洋科学] 0713[理学-生态学] 

基　　金：Project on the exploration of fishery resources in the offshore supported by the Ministry of Agriculture(2010-2013) Chinese Polar Environment Comprehensive Investigation and Assessment Programes under contract No.CHINARE2012~2016-01-06 

主　　题：Southern Ocean Euphausia superba larvae distribution pattern 

摘      要：Spatial distribution patterns of the different life stages of Euphausia superba in the region of the South Shet- land Islands and southern Scotia Sea （Antarctica） were assessed based on scientific survey data collected in lanuary and February of 2010. Adults, eggs, nauplii, metanauplii, calyptopis I-Ill, and furcilia I-II were found in the investigation. The abundance of larvae averaged 1 172.8 ind./mz, with calyptopis I and II as the dominant stages. Habitat occupancy patterns varied among Euphausia superba at different stages, and three sub-regions were identified by cluster analysis. The degree of larval development increased from west to east. Larvae were not observed north of the South Shetland Islands. Calyptopis I was predominant in the water between Elephant Island and the South Orkney Islands, which featured no thermocline. Older stages, including calyptopis II and III and furcilia I and II, were common in north and northeast of the South Orkney Islands, which were characterized by high temperature and high chlorophyll concentration. Distri- bution and abundance of the early life stages of E. superba were associated with specific environmental con- ditions. According to Biota-Environment matching （BIOENV）, the distributions of E. superba larvae were correlated with a combination of temperature at the surface and 200 m, and 0-100 m integrated chlorophyll a concentration.