南沙群岛海区毛颚动物的昼夜垂直移动  

DIURNAL VERTICAL MIGRATION OF CHAETOGNATH AROUND NANSHA ISLANDS WATERS SOUTHERN SOUTH CHINA SEA

作　　者：张谷贤[1] 尹健强[1] 

机构地区：[1]中国科学院南海海洋研究所,广东广州510301

出　　处：《热带海洋学报》2002年第1期48-56,共9页Journal of Tropical Oceanography

基　　金："九五"国家科技专项"南沙群岛及其邻近海区综合科学考察" ( 97 92 6 0 2 0 3)资助

摘　　要：对 1 997年 1 1月和 1 999年 4月、7月在南沙群岛海区 3个昼夜连续测站采集的毛颚动物样品进行了研究。结果表明 ,这些水域的毛颚动物的昼夜垂直移动可以划分为 3个类型 :种类作显著移动 ,不作显著移动和仅在夜晚移动。作为昼夜垂直移动显著的种类 ,又可以把它们划分为 :(1 )种类在整个水柱移动 ;(2 )种类在上层 (0— 6 0m)移动 ;(3 )种类在中层 (6 0—1 0 0m)移动。作为昼夜垂直移动不明显的种类 ,又可以把它们分为 :(1 )种类分布于上层 (0—6 0m) ;(2 )种类分布于底层 (1 0 0— 2 0 0m)。种类在白天下降或附着在海底物体上 ,仅在夜晚移动。光照 ,水温 ,食物和种类特征是影响本水域毛颚动物昼夜垂直移动的重要因素。The chaetognaths specimens collected by diurnal and vertically-stratified sampling in November of 1997 and April and July of 1999 at 3 stations in the waters around the Nansha Islands, southern South China Sea are studied in the paper. The results show that chaetognaths in the waters can be divided into three types, i.e. species with evident migration, without evident migration and with migration only at night. The species with evident diurnal vertical migration can be further divided into following types: 1) Species migrating in the whole water column; 2) Species migrating in the upper layer (0-60m);3) Species migrating in the middle layer (60-100m). Species without evident diurnal vertical migration can also be further divided into two types: 1)Species distributing in the upper layer (0-60m); 2) Species distributing in the low layer (100-200m). The species sink or attach to things on the bottom in the day and migrate only at night. Light,temperature,food and specificity of species are important factors affecting diurnal vertical migration of chaetognaths in the waters.

关 键 词：毛颚动物 移动类型 环境因素 昼夜垂直移动 南沙群岛海区 浮游动物 

分 类 号：O178.53[理学—数学]