Seasonal Nearshore Occurrence of the Neurotoxin β-N-methylamino-L-alanine (BMAA) in Lake Winnipeg, Canada

E. Pip, Kimber E. Munford, L. Bowman
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引用次数: 12

Abstract

Seasonal fluctuation patterns of the neurotoxic amino acid β N methylamino L alanine (BMAA) were examined at four-day intervals during the ice-free season in water at three nearshore stations in the south basin of Lake Winnipeg, Canada. BMAA patterns were significantly exponentially correlated with concurrent phaeophytin, and inversely with chlorophyll a, indicating that free BMAA concentrations increased as blooms declined. BMAA was also significantly related to preceding microcystin concentrations, and as chlorophyll a declined, the proportion of BMAA relative to microcystin increased. Cross correlations identified significant relationships between BMAA and immediately preceding nitrate-N/inorganic phosphorus ratios, nitrate-N, rainfall, and a marginal inverse correlation with inorganic phosphorus. Total suspended solids levels were also significantly associated with BMAA, likely due to shading effects. A very high BMAA concentration was found under collapse of intense bloom conditions. These results have implications for water quality monitoring, nutrient management strategies and public health.
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加拿大温尼伯湖近岸神经毒素β- n -甲氨基- l -丙氨酸(BMAA)的季节性发生
在加拿大温尼伯湖南部盆地的三个近岸站,每隔4天检测了无冰季节水体中神经毒性氨基酸β N甲基氨基L丙氨酸(BMAA)的季节波动模式。BMAA模式与并发的褐藻素呈极显著指数相关,与叶绿素a呈负相关,表明游离BMAA浓度随花华减少而增加。BMAA也与前期微囊藻毒素浓度显著相关,并且随着叶绿素a的降低,BMAA相对于微囊藻毒素的比例增加。交叉相关发现,BMAA与前一阶段的硝酸盐- n /无机磷比率、硝酸盐- n、降雨量之间存在显著相关性,与无机磷之间存在边际负相关。总悬浮固体水平也与BMAA显著相关,可能是由于遮阳效应。在强花塌条件下,BMAA浓度非常高。这些结果对水质监测、营养物管理策略和公共卫生具有重要意义。
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