Minasyan Arevik, Christophoridis Christophoros, Wilson Alan E, Zervou Sevasti-Kiriaki, Kaloudis Triantafyllos, Hiskia Anastasia
UNESCO Chair in Life Sciences, International Postgraduate Educational Center, Acharian 31, Avan, Yerevan 0040, Armenia; Ludwig-Maximilians University, Munich, Department of Biology II, Aquatic Ecology, 82152, Planegg-Martinsried, Germany; Auburn University, School of Fisheries, Aquaculture, and Aquatic Sciences, 203 Swingle Hall, 36849, Auburn, Alabama, United States.
Laboratory of Catalytic - Photocatalytic Processes and Environmental Analysis, Institute of Nanoscience & Nanotechnology, National Center for Scientific Research "Demokritos", Patriarchou Grigoriou & Neapoleos 10, 15341, Agia Paraskevi, Athens, Greece.
Toxicon. 2018 Aug;150:28-38. doi: 10.1016/j.toxicon.2018.04.021. Epub 2018 Apr 26.
This paper presents the first report of cyanobacteria and cyanotoxins from the South Caucasus region, in particular from Lake Yerevan (Armenia). Microcystis, Dolichospermum and Planktothrix were the key genera identified during the growing season. A trend of a remarkable increase in cyanobacterial densities was observed from 2012 to 2013 exhibiting bloom formation in June (by Nostoc linckia) with the highest values in June and August 2013, reaching up to 695.9*10 cells mL. Seasonal dependence of cyanobacterial density on temperature, and temperature as a driver for cyanobacterial cells growth and development were suggested. Biogenic nutrients were identified as co-drivers determining species richness and dominance, as well as the distribution of phytoplankton in different parts of the reservoir. Cyanotoxin concentrations in the filtered biomass were reported during July 2012 for both stations of the reservoir (left and right bank). Microcystin-RR (MC-RR) was the most abundant and the most frequently observed cyanotoxin. Lower MC-LR concentrations were identified in all samples from both stations, with the highest values observed at the right bank in July 2012. [D-Asp]MC-RR, MC-YR, MC-HtyR, [D-Asp]MC-LR, MC-HilR, MC-WR, MC-LY and MC-LW were also identified in trace levels. Anatoxin-a (ANA) was reported in the samples from both stations during August 2012. Cylindrospermopsin (CYN) was present in trace concentrations in samples from both stations during July and in the sample from the left bank during September.
本文首次报道了南高加索地区，特别是埃里温湖（亚美尼亚）中的蓝藻和蓝藻毒素。微囊藻属、念珠藻属和席藻属是生长季节中鉴定出的主要属。2012年至2013年期间观察到蓝藻密度显著增加的趋势，6月（由林氏念珠藻引起）出现水华形成，2013年6月和8月达到最高值，高达695.9×10⁶个细胞/毫升。研究表明蓝藻密度与温度存在季节性依赖关系，温度是蓝藻细胞生长和发育的驱动因素。生物营养物质被确定为共同驱动因素，决定了物种丰富度和优势度，以及浮游植物在水库不同区域的分布。2012年7月报告了水库两个站点（左岸和右岸）过滤生物量中的蓝藻毒素浓度。微囊藻毒素-RR（MC-RR）是含量最丰富且最常观察到的蓝藻毒素。在两个站点的所有样本中均检测到较低的微囊藻毒素-LR（MC-LR）浓度，2012年7月在右岸观察到最高值。还在痕量水平鉴定出了[D-天冬氨酸]微囊藻毒素-RR、微囊藻毒素-YR、微囊藻毒素-HtyR、[D-天冬氨酸]微囊藻毒素-LR、微囊藻毒素-HilR、微囊藻毒素-WR、微囊藻毒素-LY和微囊藻毒素-LW。2012年8月在两个站点的样本中均检测到了 Anatoxin-a（ANA）。2012年7月两个站点的样本以及9月左岸的样本中均存在痕量浓度的柱孢藻毒素（CYN）。
