淀山湖夏秋季微囊藻毒素-LR和类毒素-A分布状况及其影响因素

为了解淀山湖夏秋季藻类和藻毒素分布状况及其影响因素 ,在淀山湖选了 6个点 ,分别测定了总氮、总磷、铁、叶绿素 -A和COD的含量 ,同时记录了水温、pH值、照度、浊度 ,另外还进行了藻细胞计数和藻种的鉴定以及微囊藻毒素 -LR和类毒素 -A含量的测定。结果表明 ,两种藻毒素均在 7月份污染最严重 ,微囊藻毒素 -LR在网箱分布最多 ,而类毒素 -A在急水港分布最多。广义估计方程回归分析表明 ,藻细胞总数与总氮、总磷和叶绿素 -A有显著的相关性 (P <0 0 5) ,藻细胞总数和水温对微囊藻毒素 -LR的分布有显著的影响 (P <0 0 1 ) ,水体浊度可显著影响类毒素 -A的分布 (P <0 0 1 )。微囊藻毒素 LR与类毒素 -A有轻度的相关关系 (P <0 0 5)。总之 ,淀山湖存在较严重的微囊藻毒素 -LR污染和较轻度的类毒素 -A污染 ,影响两种毒素分布的因素并不完全一致

Distribution of microcystin-LR and anatoxin-A and their influence factors in Dianshan Lake during summer and autumn

Six different sampling locations in Dianshan Lake were selected to study the distributions of algaes and algae toxins and their influencing factors in summer and autumn. Total nitrogen (TN), total phosphorous (TP), Fe, chlorophyl a(Chla) and COD in water samples were determined. At the same time, water temperature (TEM), pH value, illumination, turbidity degree (TUR) of water body were recorded. In addition, the total number and attribute of algae cell and the content of microcystin LR(MC LR) and anatoxin A(ANTX A) were checked. The results showed that the pollution of both toxins was most serious in July. The MC LR were mostly distributed in Wangxiang, but the ANTX A were mostly distributed in Jishuigang. Generalized estimating equations (GEE) regression analysis showed that total number of algae cell was significantly correlated with TN, TP and Chla ( P <0 05). The distribution of MC LR was significantly affected by total number of algae cells and TEM ( P <0 01), but TUR mainly affected the distributions of ANTX A( P <0 01). There was weak correlation between both toxins ( P <0 05). In short, there was a serious pollution of MC LR, but ANTX A pollution was light. The factors influencing the distributions of both algae toxins were not completely consistent.