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20 0 1— 2 0 0 2年的秋冬季节 ,于中国东南沿海的南澳岛周围海域突发了双环海链藻赤潮 ,该赤潮藻及其赤潮在中国都是首次记录。该赤潮藻以实心胶质块的群体形式出现 ,其群体一般呈球形或椭球形 ,常为茶褐色 ,大小不一 ,直径多数在 2— 3mm之间 ,最小的不到 0 1mm ,最大的约有 5mm。胶质块由双环海链藻和数种羽纹硅藻组成 ,前者分布于外层 ,后者包埋其中。双环海链藻的细胞密度最大达 1 75× 10 7cells/L ,占浮游植物总细胞数的 78 8%。如把包埋其中的羽纹硅藻考虑进去 ,赤潮藻胶质块的组成细胞总密度则高达 2 2 8× 10 7cells/L以上 ,占浮游植物总细胞数的 95 9%。赤潮藻的密度由湾内向外海呈显著递减趋势 ,与营养盐的平面分布格局相反。该赤潮起源于外海 ,赤潮发生机制可能与 2 0 0 1— 2 0 0 2厄尔尼诺年导致的水温异常升高有关。
In the autumn and winter of 2000, the red tide of Cyclonella multocida blooms in the waters around Nanao Island on the southeast coast of China. The red tide algae and its red tide were recorded for the first time in China. The red tide algae as a group of solid gel mass groups, the population is generally spherical or ellipsoid, often brown, often different sizes, most of the diameter of 2 - 3mm, the smallest less than 0 1mm, the largest about 5mm. Gel block consists of Cyclobalanopsis multiflora and several plumes of diatoms, the former distributed in the outer layer, the latter embedded in them. The cell density of the sea buckthorn was up to 1 75 × 10 7 cells / L, accounting for 78.8% of the total number of phytoplankton cells. Considering the plume of diatom entrapped in it, the total cellular density of red tide algae blocks was as high as 228 × 10 7 cells / L, accounting for 95 9% of total phytoplankton cell numbers. The density of red tide algae showed a significant decreasing trend from the bay to the outer sea, opposite to the flat distribution pattern of nutrients. The red tide originates in the open sea, and the mechanism of red tide may be related to the abnormal increase of water temperature caused by El Niño in 2000-02.