Table 6.

χ² analysis relating each factor (species, genus, site and time) to sample module membership.

	df	χ 2	p-value
Species*	25	536.12	<2.2 × 10−16
Genus*	10	376.02	<2.2 × 10−16
Site*	15	64.254	4.6 × 10−8
Time*	10	42.703	5.6 × 10−6