Table S1. Site locations.

Table S2. Species abundance by site. Values are of the total number of snails collected from each site. Sampling during 2007 was more rigorous than in 2004, Nine 1m2 quadrats were sampled in 2007 and only five in 2004.

Table S3. Average values for environmental variables by site.

Table S4. Results of spatial correlations with snail community differences at local scales.

Table S5. Loadings on the first two axes from the CCA of 2007 survey data.

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