FIGURE 4 in Recent changes in abundance and cell size of pelagic diatoms in the North American Great Lakes

FIGURE 4: Change in cell size (µm) for select diatom species from spring sample locations throughout the Great Lakes. Line lengths represent the difference in size between the average for pre-2000 years (1996, 1998, 1999) and post-2000 years (2007, 2008). Black, down-pointing lines indicate declines in average cell size at each sample location. Gray, up-pointing lines similarly indicate cell size increases over the sampling period. The presence of a circle at a sampling station indicates that the taxon was observed during both periods.