Figure 4: Comparisons of light penetration (%) between June
and July (A), June and August (B), and July and August (C). Boxplots
show absolute differences in light penetration within each plot between
month pairings. Line plots show change in mean light penetration for
each plot between month pairings. Mean light penetration at the plot
level was significantly different between months (repeated measures
ANOVA, F2,96=9.2, P < 0.001). Mean
light penetration in June was significantly higher than in July
(Bonferroni, P adj < 0.001) and August
(Bonferroni, P adj = 0.036). July and August did
not significantly differ (Bonferroni, P adj =
0.4). Between June and July, 37 plots decreased in light penetration
while 12 plots increased. Between June and August, 31 plots decreased in
light penetration, while 18 plots increased. Between July and August, 22
plots decreased in light penetration while 27 plots increased. Boxes
represent the 25th to 75th percentiles of the data, and whiskers
represent the 10th and 90th percentiles. Lines coloured in black
represent plots that decreased in light penetration from the first to
the second month, and lines coloured in goldenrod represent plots that
increased in light penetration from the first to the second month. Month
pairings marked by an asterisk (*) significantly differed in mean light
penetration.