| 摘要: |
| Alexandrium lusitanicum于1987年采自葡萄牙沿海，Y－100于1989年采自德国湾。在暗室中用一根柱长150cm、内径3.4cm的玻璃柱对两种涡鞭毛藻的垂直迁移特性进行研究。结果表明，两种藻均进行有规律的周日垂直迁移，且均在光照开始前2h开始向上迁移，光照结束前3h开始向下迁移。A．lusitanicum向上迁移速度约为240 μm/s向下约为850 μm/s；Y－100向上迁移速度约为280 μm/s，向下约为1400 μm/s，二者都属能够高速迁移的藻类。Y－100呈很规则的周日阶段性分裂现象，分裂频率高峰出现在光照前1h左右。这两种涡鞭毛漠的周日垂直迁移特性有利于它们更多地获取光能和营养盐从而在其他条件也合适时迅速增殖并聚集在水体表层而引起赤潮。 |
| 关键词: 赤潮 涡鞭毛藻 垂直迁移 |
| DOI： |
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| 基金项目:中国科学院海洋研究所调查研究报告第2261号。国家自然科学基金资助，9389008号 |
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| DIURNAL VERTICAL MIGRATIONS OF TWO DINOFLAGELLATES |
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Zhou Mingjiang1, M. Elbrachter2
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1.Institute of Oceanology, Academia Sinica, Qingdao 266071;2.Biologische Anstalt Helgoland, Germany, 2282 List/sylt
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| Abstract: |
| Clear patterns of diurnal vertical migration of two dinoflagellates, Alexandrium lusitanicum and Y-100 were observed using a 150 cm long and 3.4 cm diameter glass tube in a dark room. The results show that both algae started to move upwards with speeds of 240 μm/s and 280 μm/s, respectively, 2 hours before light on and began to swim downwards 3 hours before light off with speeds of 850 μm/s and 1400 μm/s, respectively. The growth of Y-100 showed distinctly phased division. The peak of division frequency appeared 1 hour before light on with division frequencies of 13% - 17% while the division frequencies at other times were less than 3%. Vertical migration enables the algae to assimilate sun energy at the top layer and to take up nutrients at the bottom, hence to growth quickly under other suitable conditions to form red tides. |
| Key words: Red tide, Dinoflagellate, Vertical migration |
