泉州湾赤潮藻类优势种演替影响因子探讨

THE INFLUENCE FACTORS ON DOMINANT RED-TIDE ALGAL SPECIES SUCCESSION IN QUANZHOU BAY

于2006年5—11月对东海泉州湾赤潮监控区设定4个采样站位,进行赤潮常规监测。结果表明,泉州湾藻类优势种由中肋骨条藻(Skeletonema costatum)、太平洋海链藻(Thalassiosira pacifica)、微小原甲藻(Prorocentrum minimum)、尖刺拟菱形藻(Pseudo-nitzschia pungens)、丹麦细柱藻(Leptocylindrus danicus)及旋链角毛藻(Chaetoceros curvisetus)等赤潮生物组成,虽然中肋骨条藻为最主要的优势种,但有3个站位出现了上述优势种的演替。通过深入分析该海域水质营养盐含量及组成结构的动态变化对赤潮藻类优势种演替的影响,发现由于不同的赤潮藻类种群具有各自的生态习性及适应环境的生长增殖策略,海域水质营养盐含量和组成结构的变化,会引起赤潮藻类种群增殖竞争力间强弱的相对变化,而种群增殖竞争力强的种类有可能迅速增殖取代原有的优势种而演替为新的优势种,这是一个动态的过程。

Using data of red-tide monitoring in May—November, 2006 at four stations in Quanzhou Bay, the East China Sea, six dominant red-tide algal species： Skeletonema costatum, Thalassiosira pacifica, Prorocentrum minimum, Pseudo-nitzschia pungens, Leptocylindrus danicus, and Chaetoceros curvisetus were recognized. Succession of these dominants algal species occurred at three sampling stations, although Skeletonema costatum was the most dominant one. Content and combination of nutrient and the dynamic changes affect the dominant algal species succession. The result shows that due to the nature of adaption to the environment, different algae species can proliferate with own competitive ecological characteristics and strategies against any ambience change in nutrient status, and thereby resulting in ups and downs of population of a red-tide algal species, and the dynamic succession of the species one another.