Habitat use was judged based on intimate association between
fishes and one or more alternative habitat-types, whereby the
fishes were generally found hiding well within the branches of a
particular habitat. A small number of fishes were also seen in the
water column immediately above one or other habitat-type, but
immediately sought shelter within this habitat when observes
approached. Two separate 2-way ANOVAs were used to test for
differences in the relative use of each of the three habitat treatments
by the two butterflyfish species. Residual plots were used to
ensure ANOVA assumptions were satisfied. To improve normality
and homogeneity of variances, data was log10(x þ 1) transformed.
Tukey’s Honest Significant Difference (HSD) tests were then used to
identify where differences in group means occurred.