Taxonomic assessment of a toxic cyanobacteria shift in hypereutrophic Grand Lake St. Marys (Ohio, USA).

摘要: Abstract Grand Lake St. Marys (Ohio, USA) is a hypereutrophic reservoir prone to persistent toxic cyanobacterial blooms fueled by agricultural nutrient runoff. The pervasive and highly 2010 bloom led the collapse of local tourism industry, with microcystin concentrations exceeding 2000 μg mL −1 at some locations during peak bloom. Sampling from location adjacent intake Celina Water Treatment Plant, chlorophyll levels remained above 25 μg L June September, reaching maximum in excess 100 μg L July. Molar ratios dissolved inorganic nitrogen (DIN) phosphorus (DIP) declined below 16 July August, suggesting population became N-limited peak. Cyanobacterial biomass was dominated Planktothrix spp. throughout late summer 2010, but phylogenetic analysis mcyA sequences revealed presence Microcystis that coincided highest toxin measurements. August September samples indicated community shifted yield as major genus. Community shifts this nature may impede targeted remediation efforts, therefore thorough understanding taxa involved necessary prior implementing strategies limit formation.