Analysis of variance comparing densities of juvenile Siphonaria concinna and S. serrata in 7 regions along the 1500 km of the limpets’ biogeographic range in 4 small and 4 large patches.

Region (Western Cape, South Western Cape, Southern Cape, Eastern Cape, Southern Transkei, Northern Transkei and Kwa-Zulu Natal) was a random factor, Species (S. concinna or S. serrata) was fixed and orthogonal, Size (small or large) was fixed and orthogonal, and Patch (4 small and 4 large) was a random factor and nested in Region and Size, and n = 6 replicate quadrats. Data were Sqrt(x+1) transformed to satisfy homogeneity of variances, Cochran’s Test C = 0.05. 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).