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Figure S1. Plots showing a comparison of water chemistry in the Hengill streams to other sites.

Figure S2. Photographs illustrating shape approximations of a diatom species with an unusual valve outline.

Figure S3. Linear regression plots of temperature against log10 valve area for 31 diatom species that were present in at least 2 of the sampled streams.

Figure S4. Community-level plots showing mean log10 valve area for 8 different abiotic variables in the fourteen streams, analogous to Fig. 3 in the main text.

Table S1. Water chemistry data for the fourteen streams.

Table S2. Correlation analysis results of temperature against abiotic variables in the fourteen streams.

Table S3. Valve areas of thirteen diatom species comparing old and new shape approximations.

Table S4. Slopes and P-values from linear regressions of temperature against log10 valve width for 31 species of diatom found in at least 2 of the sampled streams.

Table S5. Matrix showing the proportion of the total community size change between streams that is due to intraspecific effects.

Table S6. Matrix showing the proportional contribution of species turnover to overall species compositional differences between streams.

Table S7. Slopes and P-values from linear regressions of 8 different abiotic variables against log10 valve area for 31 species of diatom found in at least 2 of the sampled streams.

Table S8. Summary of significant results in Table S7.

Table S9. Results from linear and quadratic regressions of temperature and 8 other abiotic variables against mean log10 valve area in the fourteen streams.

Table S12. List of all sampled species names with their respective authorities.

gcb12285-sup-0002-TableS10.csvCSV document80KTable S10. Size measurements (valve width and length) of diatom individuals sampled from the fourteen streams.
gcb12285-sup-0003-TableS11.csvCSV document11KTable S11. Count data for all diatom species found in each of the fourteen streams.

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