东海毛颚动物夏季垂直分布

本文材料取自范围为123°—129°E,26°30′—32°30′N的东海。主要在水深超过80米的测站进行垂直分层采集。采集层次为0—50米,50—100米,100—250米,250—500米,500—1000米,1000米—底。网具用附闭锬装置的大型浮游生物网。资料的整理系沿200米等深线划分为两部分(A区和B区)进行计算和分析。经鉴定的毛腭类计4属21种,它他大多数分布子100米上层,数量和种类随着深度的增加而减少。优势种肥胖箭虫分布于0—250米,少数能分布更深,但数量集中于100米上层。2个近似种——海龙箭虫与百陶箭虫的垂直分布有所不同,前者几乎只在A区,主要在50—100米;后者A、B区皆有,50米上层居多。微箭虫的分布有避开表面的趋势。第一次采到大头箭虫、拟漂移箭虫和钩剌真(?)虫等个别标本。钩剌真(?)虫是冷水种,分布深度随纬度而异。

VERTICAL DISTRIBUTION OF CHAETOGNATHS IN THE EAST CHINA SEA IN SUMMER OF 1978

The study was conducted in the East China Sea,located about 123°-129°E, 26°30'N-32°30'N. Vertical hauls were mainly made at depths greater than 80 meters and samples were taken through a water column at layers 0-50,50-100. 100-250,250-500,500-1,000, 1,000-bottom.A Nansentype conical net with closing mechanism was used. For convenience of notation, the area shallower than 200m and deeper than 200m will be referred to as the area "A" and "B" respectively in this paper.Chaetognaths were identified and counted,...