Table 2.

Statistical output from Wilcoxon signed-rank tests, showing the effect of incubation time on the hourly ¹⁵N enrichment (APE ¹⁵N, % h⁻¹) in Symbiodinium and their host coral, Pocillopora damicornis

Inoculation conditions	Colony	Region of interest	χ 2	p	Mean Δ hourly APE 15N
Day [Exp. 1]	1	Symbiodinium	52.842	< 0.0001	−50%
		Host	8.308	0.0039	−31%
	2	Symbiodinium	61.140	< 0.0001	−42%
		Host	6.667	0.0098	−27%
Night [Exp. 2]	1	Symbiodinium	10.368	0.0013	−32%
		Host	0.2135	0.6441	−23%

Chi-squared (χ²) and p-values are provided, with significant changes highlighted in bold. The relative difference in hourly APE ¹⁵N (depicted in Fig. 2e, g and 3e, g) between fragments fixed at different times is also provided