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Appendix S1. Schematic representation (a) and photographic image (b) of the stream mesocosm facility at the Freshwater Biological Association River Laboratory, Dorset, U.K. Four blocks of three stream mesocosms (each channel 12 m length×0.3 m width) were fed water through pipes (6 m length) from the parent stream. Water flow (direction indicated by arrows) in to each mesocosm was controlled by a valve. Each block contained a control channel and a disturbed channel, with the third channel in each block used in allied research not reported here.

Appendix S2. Tables for repeated measures ANOVA testing the main effects of drought treatment, experimental block (between-subject factors) and year (within-subject factor), and their interactions, on total macroinvertebrate secondary production (a) and that of six functional feeding groups (b–g).

Appendix S3. Summary of benthic macroinvertebrate biomass and secondary production in undisturbed controls and monthly disturbed stream mesocosms. B mean annual biomass (mg AFDM m-2), P mean annual secondary production (mg AFDM m-2 year-1) with standard error in parentheses. B – Bivalvia, C – Coleoptera, D – Diptera, E – Ephemeroptera, G – Gastropoda, H – Hirudinea, He – Hemiptera, M – Megaloptera, O – Oligochaeta, T – Trichoptera, Cr – Crustacea, Od – Odonata, P – Plecoptera. Taxa within functional feeding groups (totals in bold) are ranked alphabetically.

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