Meteorological and Nutrient Conditions Influence Microcystin Congeners in Freshwaters.

摘要: Cyanobacterial blooms increasingly impair inland waters, with the potential for a concurrent increase in cyanotoxins that have been linked to animal and human mortalities. Microcystins (MCs) are among most commonly detected cyanotoxins, but little is known about distribution of different MC congeners despite large differences their biomagnification, persistence, toxicity. Using raw-water intake data from sites around Great Lakes basin, we applied multivariate canonical analyses regression tree identify how (MC-LA, -LR, -RR, -YR) varied changes meteorological nutrient conditions over time (10 years) space (longitude range: 77°2'60 94°29'23 W). We found MC-LR was associated strong winds, warm temperatures, nutrient-rich conditions, whereas equally toxic yet less studied MC-LA tended dominate under intermediate wetter, nutrient-poor conditions. A global synthesis lake peer-reviewed literature showed composition differs regions, more reported North America than Europe. Global patterns vary morphometry. Ultimately, knowledge environmental factors leading formation freshwaters necessary assess duration degree toxin exposure future change.