Table 3. Mean migration speed, S_tot, O₂ and pH measured at the front and base of CP and BBD mats, along with relative quantity of sulphate-reducing bacteria, developmental stages and Chl a contents of individual coral lesions. Results of linear regression analyses are given with respect to migration speed.

	Migration speeda (mm per day)	Mean Stotb (μM)	Mean O2b (μM)	Mean pHb	DSR (% per 106 16S rRNA)	Developmental stagec	Chl ad (Chl a g−1)
CP no. 1	1.18±0.00	20	193	8.53	2.2	5	80
CP no. 2	0.04±0.01	0	264	7.77	<0.01	2	212
CP no. 3	0.01±0.01	0	278	8.23	0.5	2	313
BBD no. 1	8.63±0.03	2654	0	7.83	9.2	10	733
BBD no. 2	4.19±0.02	246	10	7.22	2.3	9	413
BBD no. 3	1.41±0.02	46	113	7.47	7.8	8	267
Linear regression analysese
Intercept		1.141	5.976	18.99	0.3354	−2.120	−1.922
Slope		0.003	−0.024	−2.093	0.611	0.783	0.013
R2		0.856	0.756	0.091	0.505	0.684	0.803
P-value		0.008*	0.024*	0.561	0.113	0.042*	0.016*

Abbreviations: BBD, black band disease; CP, cyanobacterial patch; Chl a, chlorophyll a.

^aMean migration speed per day (n=5, ±s.e.).

^bMean over light (S_tot, pH 250 and O₂ 125 μmol photons m⁻² s⁻¹) and dark conditions.

^cDevelopmental stage of lesions assessed by visual inspection.

^dStated per wet weight of mats.

^eSignificance levels at the 5% level are indicated by ^*.