Table S1. Description of habitat features andtheir categorizations (see Barbour et al., 1999).

Table S2. Alpha (minimum, maximum and mean), beta and gamma of aquatic macroinvertebrates in the investigated streams in peninsular Malaysia.

Table S3. Summary of PERMDISP analyses. Shownare the test results, as well as average distances of riffle sitesto stream centroid (and SE). Separate analyses were conducted usingBray-Curtis, Sorensen and Simpson coefficients.n = the number of riffle sites per stream.

Table S4. Results of least squares regressions between different components of the habitat score and Sorensen-based beta diversity. Significant models are denoted by asterisks.

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