Table 2.

Abundance of nifH copy number from three coral species in spring and summer (expressed as mean value and standard error, SE).

	Spring (nifH copy number μg-1 colony) Mean ± SE	Summer (nifH copy number μg-1 colony) Mean ± SE	P t-test
G. astreata	5.47 ± 1.05	1.34 ± 0.84	<0.001
P. decussata	1.93 ± 1.71	2.11 ± 1.97	0.841
P. lutea	4.07 ± 1.51	151.56 ± 8.25	<0.001

Significant differences (P < 0.05) are indicated in italics.