东海陆架黑潮区鸟尾藻的分类及其生态分布特点

Study on taxonomy and distribution of Ornithocercus in the East China Sea

对东海陆架黑潮区及邻近海域的鸟尾藻进行了分类与生态分布研究 ,共检出 5种鸟尾藻 :大鸟尾藻、斯氏鸟尾藻、美丽鸟尾藻、赛氏鸟尾藻和方鸟尾藻。扫描电镜观察结果表明 ,鸟尾藻的纵沟左边翅是由两块边翅相连接而成 ,即由右下体边翅与纵沟左边翅相连而成。鸟尾藻分布的生物边界与暖水到达的位置相吻合 ,对东海黑潮及其台湾暖水水系具有显著的指示作用。

The samples desccibed in this paper are from the East China Sea taken by R/V Shijian during China\|Japan joint project on Kuroshio from 1986~1992. Morphological structures of these species are carefully examined under LM and SEM. It reveals that \%Ornithocercus possesses\% five list, namely upper girdle list, low girdle list, right posterior list, left sulcal list and right sulcal list.The distributive pattern of \%Ornithocercus\% coinsides well with the hydrological boundary of Kuroshio in all seasons. Thus, they can be served as good indicator for the warm water systems in the East China Sea. \%Ornithocercus\% and their symbionts, cyanobacterials, may be beneficial each other in the oligotrophic open water ecosystems. The heterotrophic dinoflagellate may provide the cyanibacterial symbionts with the anaerobic microenvironment necessary for N fixation and in turn, the symbionts can be served as a carbon source such as the functional role of chloroplasts for \%Ornithocercus\%.