Table 2. Frequency of gap formation presented for both sites and gap definitions.

Gap Definition	Site	Sample Area (ha)	Initial Gap Area (%)	Final Gap Area (%)	Percent New Gap (%)	KS-test p-value
Dynamic Gap	Ducke Reserve	602	1.20	1.52	64.2	0.39
	Tapajos	398	4.37	5.49	23.2	0.33
Brokaw (1982) Gap	Ducke Reserve	602	0.01	0.04	98.9	0.78
	Tapajos	398	0.03	0.11	98.8	0.95

The area covered by lidar at both time periods is reported with the proportion of initial gap area, proportion of final gap area, and the proportion of the amount of final gap area newly formed between samples for both the dynamic gap definition (10 m height cutoff) and the Brokaw (1982) gap definition (2 m height cutoff) for a minimum gap area of 10 m². A Kolmogorov-Smirnov test was used to compare the distributions of gap sizes between years for each site by definition.