Boxplots summarizing the comparison of the 15 marine water samples biomass proportions from inverted microscopy (MCP), with DNA metabarcoding number of reads (MTB) and the corrected C-estimation values from metabarcoding reads (MTB_CFbio) using median cellular C-content values per taxum from microscopy dataset. (A) Bacillariophyta, (B) Dinoflagellata, (C) Ciliophora, and (D) flagellated cells. The vertical line inside the box plots represents the median, the top and the bottom hinges correspond to the interquartile range, and the whiskers show the minimum and maximum non-outlier values.