Teneva Ivanka, Belkinova Detelina, Mladenov Rumen, Stoyanov Plamen, Moten Dzhemal, Basheva Diyana, Kazakov Stefan, Dzhambazov Balik
Plovdiv University "Paisii Hilendarski", Plovdiv, Bulgaria Plovdiv University "Paisii Hilendarski" Plovdiv Bulgaria.
Bulgarian Academy of Sciences, IBER, Sofia, Bulgaria Bulgarian Academy of Sciences, IBER Sofia Bulgaria.
Biodivers Data J. 2020 Dec 16;8:e57507. doi: 10.3897/BDJ.8.e57507. eCollection 2020.
As producers of biomass, cyanobacteria are a major part of the phytoplankton in a large number of water basins. Due to the cyanobacterial blooms and cyanotoxins produced, these organisms are recognized as a threat and ecological risk for water bodies. Released cyanotoxins may cause death of many organisms including birds and fish. Vaya Lake is the largest natural lake in Bulgaria. It is located on the Via Pontica migration route of birds between Europe and Africa. Since 2003, the lake has been declared as a "Wetland of international importance" under the Ramsar Convention. According to the literature data from 2002-2006, the Lake is defined as highly eutrophied due to strong anthropogenic pressure, but regular monitoring of the cyanobacterial blooms and presence of cyanotoxins after this period is missing. Taking into account the importance of this unique, protected ecosystem, our aim was to make a complete ecological assessment of the present state of Lake Vaya by using the phytoplankton, with an emphasis on cyanobacterial blooms and the presence of cyanotoxins. As results of the study, we 1) characterized the phytoplankton composition qualitatively and quantitatively; 2) evaluated the ecological status of the western and eastern part of the Lake; 3) identified the potential producers of cyanotoxins; 4) observed cyanobacterial blooms and discussed the influence of macrophytes on their spread; 5) measured the concentrations of the cyanotoxins MCs, CYL and STXs in water samples from both parts of the Lake. Our results indicated the need for continued observation of cyanobacterial composition, blooming and the presence of cyanotoxins in Lake Vaya.
作为生物质生产者，蓝藻是大量水域中浮游植物的主要组成部分。由于蓝藻水华和产生的蓝藻毒素，这些生物被认为是水体的威胁和生态风险。释放的蓝藻毒素可能导致包括鸟类和鱼类在内的许多生物死亡。瓦亚湖是保加利亚最大的天然湖泊。它位于鸟类在欧洲和非洲之间的庞蒂卡迁徙路线上。自2003年以来，该湖已根据《拉姆萨尔公约》被宣布为“具有国际重要性的湿地”。根据2002 - 2006年的文献数据，由于强烈的人为压力，该湖被定义为高度富营养化，但在此之后对蓝藻水华和蓝藻毒素存在情况的定期监测缺失。考虑到这个独特的受保护生态系统的重要性，我们的目标是通过浮游植物对瓦亚湖的现状进行全面的生态评估，重点是蓝藻水华和蓝藻毒素的存在情况。作为研究结果，我们1）定性和定量地描述了浮游植物的组成；2）评估了该湖西部和东部的生态状况；3）确定了蓝藻毒素的潜在生产者；4）观察了蓝藻水华并讨论了大型植物对其扩散的影响；5）测量了该湖两部分水样中蓝藻毒素MCs、CYL和STXs的浓度。我们的结果表明需要继续观察瓦亚湖中的蓝藻组成、水华情况以及蓝藻毒素的存在情况。
