Analysis of covariance (ANCOVA) for bioerosion experiment.

Bioerosion data (corrected for bioaccretion) square-root-transformed and analysed for east (E) and west (W) of Similan island Ko Miang. Side (E and W) and depth (7 and 20 m) as treatment factors, and initial weight of skeletal substrates as covariate; posthoc, pair wise comparisons of the adjusted group means via Tukey HSD-tests. (df = degrees of freedom; MS = means square; F = F-value; p = probability level, significance levels are **0.01>P≥0.001, ***P<0.001). Results for experimental period from February 2007 to February 2008, 12 months (A), and from February 2007 to November 2008, 21 months (B).