北冰洋加拿大海盆南缘的管水母类及其分布

本文分析了 1 999年夏季我国首次北极科学考察楚科奇海及邻近的北冰洋加拿大海盆南缘海域管水母类的种类组成、丰度和垂直分布。仅在加拿大海盆南缘出现 2种管水母 ,而楚科奇海未发现管水母类。对柔弱五角水母和北极单板水母多营养体期 (无性 )和单营养体期 (有性 )的主要形态特征作了较完整的记述和作图 ,并讨论了它们的形态类型及生态习性。加拿大海盆南缘海域北极单板水母的丰度 (平均 42× 1 0 - 3 个 m3 )大于柔弱五角水母 (2 4× 1 0 - 3 个 m3 )。这 2种管水母均仅出现在水深 1 0 0～ 80 0m ,而且最大丰度也都在 3 0 0— 2 0 0m层 ,即刚好聚集于强盐度跃层中和跃层下面

THE SIPHONOPHORES AND ITS DISTRIBUTION IN SOUTHERN EDGE WATERS OF CANADA BASIN, ARCTIC OCEAN

The composition, abundance and vertical distribution of planktonic Siphonophores, collected in Chukchi Sea and adjacent southern edge waters of Canada Basin, Arctic Ocean during the summer 1999 by first Chinese National Arctic Scientific Expedition, have been analysed. Totally, only two species of Siphonophores were identified in southern edge waters of Canada Basin, and they are absent in the Chukchi Sea. The principal morphological characteristics of the polygastric (asexual) and eudoxid (sexual) stages of Muggiaea bargmannae Totton and Dimophyes arctica Chun are fully described and illustrated. Besides, their morphological forms and ecological habits are discussed. The abundance of Dimophyes arctica , with a mean value of 42×10 -3 ind/m 3, is higher than that of Muggiaea bargmannae (24×10 -3 ind/m 3) in southern edge waters of Canada Basin. These two species of Siphonophoras were found in water layers of 100-800m and were the most abundant in 300-200m, in and above which a sharp halocline occurred .