上海市河道水体拟浮丝藻生物量与环境因子的回归分析  

Regression analysis between Planktothricoides spp. biomass and environmental factors in urban rivers from Shanghai, China

作　　者：王梦梦 张玮[1,2,3] 杨丽[1,2,3] 徐肖莹[1,2,3] 王丽卿[1,2,3] 

机构地区：[1]农业部鱼类营养与环境生态研究中心,上海海洋大学,上海201306 [2]水产种质资源发掘与利用教育部重点实验室,上海海洋大学,上海201306 [3]水产科学国家级实验教学示范中心,上海海洋大学,上海201306

出　　处：《生态学杂志》2018年第1期187-193,共7页Chinese Journal of Ecology

基　　金：生态河道监测(D-8005-14-0284)资助.

摘　　要：拟浮丝藻是一类常见的水华蓝藻,为探究城市河道生境中该类蓝藻与环境因子的关系,本研究采用广义加性模型(GAM)回归分析法对2013—2016年夏季上海地区36条河道的野外调查数据进行了分析。结果表明:夏季拟浮丝藻生物量与水温(25~35℃)和pH(6.5~9.5)二者呈显著正相关,而与氮、磷浓度相关性不显著(P>0.05);上海市河道水体中营养盐(总氮浓度平均为2.62 mg·L-1,总磷浓度平均为0.46 mg·L-1)不是拟浮丝藻生长的限制性因素;另外,拟浮丝藻生物量与轮虫、原生动物和小型枝角类生物量总体呈显著正相关,而与桡足类的生物量呈负相关;这可能与食物资源(小型可食性藻类的增加)以及不同类型的浮游动物对于丝状蓝藻的耐受性差异有关。Field investigation data in summer from 36 urban rivers in Shanghai were used to ex- plore the relationship between Planktothricoides spp., which can form cyanobacteria bloom, and its environmental factors. The generalized additive model （GAM） results showed that the biomass of Planktothricoides spp. significantly increased when the water temperature ranged between 25 and 35 ~C and the pH values ranged between 6.5 and 9.5. Contrarily, Planktothricoides spp. didn＇ t show significant correlation with total nitrogen and total phosphorus （P〉0.05） when their concentrations ranged from 0.04 to 7.33 mg ~ L-1 and from 0.04 to 4.10 mg ~ L-1, respectively. It was indicated that the high concentrations of nutrients in Shanghai rivers were no longer the limi- tation factors for the growth of Planktothricoides spp. Furthermore, significantly positive correla- tions were observed between the biomass of rotifer, protozoan and cladoeera and Planktothricoides spp., while the latter showed a negative correlation with copepod biomass. This correlation pattern between zooplankton and planktothricoides spp. may be explained by the abundance of small sized edible algae in the water column and the tolerance capability of different sized zooplankton to fila- mentous cyanobacteria.

关 键 词：蓝藻水华 拟浮丝藻 广义加性模型(GAM) 城市河道 

分 类 号：Q948.8[生物学—植物学]