FIGURE 2 in Recent changes in abundance and cell size of pelagic diatoms in the North American Great Lakes

FIGURE 2: Comparison of pre-2000 (1996, 1998, 1999) and post-2000 (2007, 2008) cell sizes. Each circle in the first two columns (spring and summer) represents a comparison of average cell size for a taxon. Taxa that occurred in only one period are not included. Diagonal gray lines are 1:1 and black lines are the fitted regressions. AP indicates Amphipleura pellucida, as mentioned in the text. The third column presents boxplot distributions of taxon-specific average cell sizes (spring and summer combined) for the two periods, for all taxa present in each period. Paired t-tests (P = 0.05, with Bonferroni correction for multiple comparisons) were used to determine differences between the two periods (no significant differences were noted). The top and bottom of each box are the 25th and 75th percentiles, a line is drawn through the middle of each box at the median, with pinches representing ± 10 percentiles. The upper and lower tails respectively indicate the largest and smallest scores beyond 1.5 interquartile ranges of the box percentiles.