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首页> 外文期刊>Harmful Algae >Cyanobacteria blooms—A possible cause of mass mortality of Lesser Flamingos in Lake Manyara and Lake Big Momela, Tanzania
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Cyanobacteria blooms—A possible cause of mass mortality of Lesser Flamingos in Lake Manyara and Lake Big Momela, Tanzania

机译：蓝藻绽放-坦桑尼亚曼雅拉湖和大莫梅拉湖小火烈鸟大量死亡的可能原因

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摘要

Limnological studies were conducted in three alkaline lakes (Lake Big Momela, Manyara and Embagai) with the aim of investigating the cause of mass mortality of the Lesser Flamingos in Lake Manyara and Lake Big Momela during July-August 2004. High concentrations, up to 150 million filaments per liter of the potentially toxic planktonic cyanobacterium Arthrospira fusiformis were found in surface scum of Lake Big Momela where Lesser Flamingos were dying at a rate of between 15 and 50 individuals per day during the study period. Gut content analyses indicated that A. fusiformis was the main food item in moribund flamingos. Mouse bioassay suggested that the crude microalgal extract dominated by A. fusiformis was toxic with all mice close to death becoming lethargic, with loss of balance, uncoordinated movements, intermittent tremors, dyspnoea with gasping followed by respiratory arrest. This observation gives circumstantial evidence that A. fusiformis at such high concentrations was toxic to the Lesser Flamingo in Lake Big Momela.
机译：在三个碱性湖泊（Big Momela湖，Manyara湖和Embagai湖）中进行了湖泊生物学研究，目的是调查2004年7月至8月在Manyara湖和Big Momela湖中的小火烈鸟大量死亡的原因。高浓度时，浓度高达150在研究期间，在大莫梅拉湖的表层浮渣中发现了每升潜在毒性的浮游性蓝藻细菌Arthrospira fusiformis百万丝，在研究期间，小火烈鸟每天的死亡人数为15至50。肠含量分析表明，烟曲霉是垂死的火烈鸟的主要食物。小鼠生物测定法表明，以梭状芽胞杆菌为主要成分的粗微藻提取物具有毒性，所有接近死亡的小鼠都变得昏昏欲睡，失去平衡，运动不协调，震颤间歇，呼吸困难并喘着粗气，然后被呼吸骤停。该观察结果提供了间接证据，表明如此高浓度的烟曲霉对大莫梅拉湖的小火烈鸟有毒。

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