深圳海域引发赤潮生物种类的演变及其原因浅析

从1981年至2001年,深圳海域共记录发生赤潮85起,引发这些赤潮的生物种类约有36种。在这20余a间,引发赤潮的生物种类的演变趋势是:(1)引发赤潮的生物种类的多样性不断增高;(2)在引发赤潮的生物种类中常见种类逐渐减少,罕见种类逐渐增多;(3)在引发赤潮的生物种类中硅藻种类正逐渐减少,甲藻类及针胞类种类明显逐渐增多。据初步分析认为,这种演变趋势与深圳海域近20a来因沿海地区社会经济发展引起的入海污染物构成变化趋势有关,并且与全球不断演变的总趋势是相一致的。

Succession trend of red tide causative organisms in Shenzhen Costal waters

Total 85 red tides events and about 36 red tide species were recorded in this paper from 1981 to 2001 in Shenzhen coastal waters. During 21years, it seemed that there's an obvious trend on the succession of red tide causative organisms: 1) The diversity of red tide causative species increased. 2) The red tide events caused by familiar species decreased while that caused by rare ones increased. 3) The red tide events caused by diatom decreased while that caused by dinoflgellate and other species increased. This succession seems to be closely related to the change of the constitutes of the pollutants dumped into coastal sea, which caused by the industry, agriculture and domestic sewage of Shenzhen in recent 20 years. Moreover this succession is consistent with the global change trend.