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Microcystins affect zooplankton biodiversity in oxbow lakes

机译：微囊藻毒素影响牛弓湖浮游动物的生物多样性

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The authors tested the hypothesis that zooplankton diversity and density are affected by the presence of cyanotoxins in the water. The authors focused on 4 oxbow lakes of the Vistula River in southern Poland, which are subjected to mass cyanobacterial development. In 2 of the oxbows (Piekary and Tyniec), microcystins released into the water were found. The highest concentration of microcystins (0.246g/L) was observed for microcystins LR. Zooplankton diversity showed a weak response to the presence of microcystins released into the water. The Shannon index (H') of total zooplankton diversity decreased in the Piekary and Tyniec oxbows during periods when the microcystin concentrations were highest. The same trend was noted for diversity of rotifers in both oxbows and for diversity of copepods in Piekary, but not for copepods in Tyniec. No such trends were found for the diversity of cladocerans in any of the oxbows, nor was a relationship found between density of zooplankton and microcystins. Statistical analyses showed that the number of species in individual samples was negatively correlated with the levels of sulfates, phosphates, and ammonia, but the microcystin concentration was positively related to those levels. This points to the complexity of the interactions and synergies among toxins, abiotic factors, and zooplankton biodiversity. In focusing on the problem of cyanotoxins, conservation studies should pay attention to this complexity. Environ Toxicol Chem 2017;36:165-174. (c) 2016 SETAC
机译：作者检验了以下假设：浮游动物的多样性和密度受水中蓝藻毒素的影响。作者集中研究了波兰南部维斯杜拉河的4个牛弓湖，这些湖正经历大规模蓝细菌的发展。在2个黄牛（Piekary和Tyniec）中，发现了释放到水中的微囊藻毒素。微囊藻毒素LR的微囊藻毒素浓度最高（0.246g / L）。浮游动物的多样性显示出对释放到水中的微囊藻毒素的响应较弱。在微囊藻毒素浓度最高的时期，Piekary和Tyniec牛的总浮游动物多样性的Shannon指数（H'）降低。在黄牛中的轮虫的多样性和皮耶卡里的of足类的多样性也注意到了相同的趋势，而在泰涅克的c足类则没有。在任何黄牛中，没有发现锁骨的这种趋势，在浮游动物的密度和微囊藻毒素之间也没有发现这种关系。统计分析表明，单个样本中的物种数量与硫酸盐，磷酸盐和氨的含量呈负相关，而微囊藻毒素的浓度与这些含量呈正相关。这表明毒素，非生物因子和浮游动物生物多样性之间相互作用和协同作用的复杂性。在关注氰毒素问题时，保存研究应注意这种复杂性。 Environ Toxicol Chem 2017; 36：165-174。 （c）2016年SETAC

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