Analysis of variance comparing within patch variability of Siphonaria concinna and S. serrata over 12 months in the Eastern Cape region.

Month was a fixed factor, Species (S. concinna or S. serrata) was fixed and orthogonal, Size (small or large) was fixed and orthogonal, and n = 4 replicate patches. Data were Ln(x+1) transformed to satisfy homogeneity of variances, Cochran’s Test C = 0.12. Post hoc Student-Newman-Keuls (SNK) tests were done for significant sources of variation to examine the direction of differences relevant to hypotheses of interest (highlighted in bold).