Vasconcelos Vitor, Morais João, Vale Micaela
CIIMAR/CIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Rua dos Bragas, Porto, Portugal.
J Environ Monit. 2011 Mar;13(3):668-72. doi: 10.1039/c0em00671h. Epub 2011 Jan 31.
A monitoring program of cyanobacteria and cyanotoxins in the framework of the surveillance of the Water Treatment Plant efficiency of the municipality of Santa Comba Dão (Portugal) was conducted from 1994 until 2007. With these data we aimed to answer the question, are MCs produced evenly over the years in a single water body? Samples were taken by the local health authorities in the site of the Water treatment plant and analyzed for total phytoplankton, cyanobacteria and the hepatotoxic cyanotoxins microcystins (MCs). Apart from 1999 and 2000, cyanobacteria represented a high proportion of total phytoplankton, attaining during several months of the year more than 90% of total phytoplankton density. A total of 24 cyanobacteria species were identified and Microcystis aeruginosa, Anabaena flos-aquae and Aphanizomenon flos-aquae were the main potentially toxic cyanobacteria species present throughout the period. MC concentration varied between 0.3 µg MC-LR eq l⁻¹ in October 98 and 87.0 µg MC-LR eq l⁻¹ in September 2001. The evolution of the average cell quota does not reveal any especial trend, although in 2001 the quota was the highest but not significantly different from the other years. The threshold limit of 5000 cells per ml of Microcystis aeruginosa should be taken into consideration in monitoring programs because the 10,000 cells per ml proposed by several other national programs might not be enough to prevent human health risks. Due to high annual variation in MC cell quota, monitoring programs of cyanobacteria and MC should be extended in time, since short term studies do not provide us the data needed for a safe management of a water body used for human purposes.
1994年至2007年期间，在葡萄牙圣孔巴当市（Santa Comba Dão）水处理厂效率监测框架内开展了一项蓝藻和蓝藻毒素监测计划。利用这些数据，我们旨在回答以下问题：微囊藻毒素（MCs）在单个水体中多年来的产生是否均匀？当地卫生当局在水处理厂所在地采集样本，分析总浮游植物、蓝藻以及具有肝毒性的蓝藻毒素微囊藻毒素（MCs）。除1999年和2000年外，蓝藻在总浮游植物中占比很高，在一年中的几个月里，其密度超过总浮游植物密度的90%。共鉴定出24种蓝藻，铜绿微囊藻、水华鱼腥藻和水华束丝藻是整个时期内主要的潜在有毒蓝藻物种。MC浓度在1998年10月为0.3 µg MC-LR当量/升，在2001年9月为87.0 µg MC-LR当量/升之间变化。平均细胞配额的变化没有显示出任何特殊趋势，尽管2001年的配额最高，但与其他年份没有显著差异。在监测计划中应考虑每毫升5000个铜绿微囊藻细胞的阈值，因为其他几个国家计划提出的每毫升10000个细胞可能不足以预防对人类健康的风险。由于MC细胞配额的年度变化很大，蓝藻和MC的监测计划应延长时间，因为短期研究无法为安全管理用于人类目的的水体提供所需数据。
