Utermo¨ hl algal settling chambers (Utermo¨ hl, 1958). Inverted, phase-contrast light microscopy was used to enumerate P. parvum cell densities in each sample
Utermo¨ hl algal settling chambers (Utermo¨ hl, 1958). Inverted,phase-contrast light microscopy was used to enumerate P. parvumcell densities in each sample