大亚湾海域锥状斯氏藻赤潮及其与孢囊的关系  

THE RELATIONSHIP BETWEEN Scrippsiella trochoidea RED TIDE AND CYSTS IN THE DAYA BAY

作　　者：肖咏之[1] 齐雨藻[1] 王朝晖[1] 吕颂辉[1] 

机构地区：[1]暨南大学水生所,广州510632

出　　处：《海洋科学》2001年第9期50-54,共5页Marine Sciences

基　　金：国家自然科学基金重大项目39970110号;国家基金主任基金39950001号。

摘　　要：用沉积物捕捉器取样，研究了大亚湾海域２０００年６～９月孢囊（Ｃｙｓｔ）种群动态，同时 分析了浮游植物种群动态。研究期间（８～９月）该海域发生了一起大规模的锥状斯氏藻赤潮。 赤潮前一个月，锥状斯氏藻孢囊的平均日形成率为２．０５× １０５ｃｙｓｔｓ／（ｍ２·ｄ），丰度为５０．２２％， 该时期以有性生殖产生的静止期孢囊为主；在赤潮盛期的８，９月初，孢囊的平均日形成率达到 ２．０１ ×１０６ｃｙｓｔｓ／（ｍ２·ｄ），丰度为９６．９７％，此时期的孢囊多为营养细胞所形成的暂时性孢囊； 赤潮结束后，由于环境条件的恶化，暂时性孢囊的形成达到高峰，平均日形成率为１．２４×ｌ０７ ｃｙｓｔｓ／（ ｍ２·ｄ），丰度为９９.５３％。结果表明大亚湾丰富的孢囊是潜在的种源（Ｓｅｅｄ　ｂｅｄ），２０００年 的夏季、秋李持续高温（＞２５℃），台风减少及风力减弱等有利锥状斯氏藻的环境条件诱发孢 囊萌发，开始了该种类的赤潮。Cyst in sediment surface and sediment trap samples and also phytoplankton in water samples were analyzed in the Daya Bay, South China Sea, from June to September, 2000. A large scale bloom of the dinoflagellate Scrippsiella trochoidea occurred during the study period (Aug. Sep. ). The population of cyst in July, before the bloom, was dominated by the resting cyst in quiescent stage. The mean daily cyst flux was 205 OOO cysts/(m2· d) and the abundance was 50. 22%. At the peak of bloom (Aug. early Sep.), temporary cyst increased greatly and take the place of the resting cyst to become the dominant population. The cyst production rates increased to 2. 01 × 10６ cysts/ (m２· d) and the abundance to 96. 97%. The cyst flux came to the maximum (1. 24 × 107 cysts/ (m2· d), abundance 99. 53% ) at the temination of the bloom. The results suggested that the abundant cysts on the sediment surface of Daya Bay may serve as a potential seed bed for the dinoflagellate bloom. The excystment was induced by the high temperature (> 25 ℃ ), optimum light intensity and less occurrence of typhoon from summer to rnid-autumn which was responsible for the initiation of S. trochoidea bloom.

关 键 词：孢囊 锥状斯氏藻 底泥捕捉器 大亚湾 海洋 赤潮 

分 类 号：X55[环境科学与工程—环境工程]