The relative intake ratio (RIR) (y-axis) represents food preference for each snail species (x-axis), for each food type. Boxplots represent data from 47 L. alte, 44 L. fulica, 46 P. martensi, and 47 V. cubensis. The box represents the interquartile range (IQR) with the median indicated by the central line. Whiskers extend 1.5 times the interquartile range, and data points outside this range are plotted as outliers.