Table 1. Statistical analysis of T-RFLP profiles to test for an effect of source (seawater vs sponge) and treatment on the structure of Ircinia-associated bacterial communities.

	I. fasciculata		I. oros
	HaeIII	MspI	HaeIII	MspI
Source (seawater vs sponge)	0.001	0.001	0.001	0.002
Treatment (control, FE, NH, FH)	0.317	0.328	0.267	0.066

Numbers denote P-values from PERMANOVA test after 999 permutations. Significant values at α = 0.01 are in bold.

Treatments: Control (13°C, unfiltered seawater), FE (13°C, filtered seawater), NH (25°C, non-filtered seawater), FH (25°C, filtered seawater).