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(a) Total Chl a, as well as (b) biomass of green algae, (c) cyanobacteria and (d) diatoms (all in μg Chl a cm−2) in control (C) and flow (F), nutrient (NP) and combined nutrient-flow (NPF) treatments. The box displays the first and third quartile, the band inside the box represents the median; the whiskers denote minimum and maximum; data more than 1.5 interquartile range below the first or above the third quartile, were treated as outliers (o).
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