大亚湾角毛教材藻细胞数量波动及其与环境因子关系的多元分析.pdf

26 4 Vol. 26, No.4 2006 4 ACTA ECOLOGICA SINICA Apr. , 2006 王朝晖, 齐雨藻, 陈菊芳, 徐 宁 ( , 510632) : 1997 6 ~ 199 7 1999 2000 ( Chaetoceros spp.) , , ( C. aff inis) ( C. debilis) ( C. distans) ( C. lorenzianus) 1997~ 199 , 66 0. 6 cellsml 99.7 % , , DIN , , DIN : ; ; ; :2006):X145, Q17 . 53 :A Population dynamics of Chaetoceros spp. and multivariate analysis of its relationship with environmental factors in Daya Bay, South China Sea WANG ZhaoHui, QI YuZao, CHEN JuFang,XU Ning ( Institute of Hydrobiology, Jinan University , Guangzhou 510632, China) . Acta Ecol ogica Sinica, 2 6, 26(4) : 1 96~ 11 2. Abstract: Population changes in Chaetoceors spp. and environmental factors were investigated in Daya Bay, South China Sea, from June 1997 to July 199 and the spring of 1999 and 2000. Relationships between abundance of Chaeto. spp. and some environment parameters were analyzed by multivariate general linear factorial analysis, linear stepwise regression analysis, and principle component analysis. Chaetoceros was the most abundant genus of phytoplankton in Daya Bay, contributing 23. 25% of the total phytoplankton abundance. Chaetoceros reached peak abundance in the spring of 199 , with maximum cell density of 66 0. 6 cellsml and 99. 7 % of total phytoplankton. C. aff inis, C. debilis, C. distans and C. lorenzianus werethe main bloom causative species. The nutrient levels were high just before the bloom of Chaetoceros, but dropped rapidly as thebloom developed. Results showed that depletion of nutrients especially dissolved inorganic nitrogen (DIN) led to the collapse of Chaetoceros bloom. Peak abundances of Cheatoceros occurred under a wide variety of water t