Appendices

Appendix 1. Summary of physical and biotic characteristics of the study streams. See Methods for details on data collection. Average and standard deviation are given for prey abundances. Streams are ordered from west to east (ST: Starratt Brook, NF: Number Five Brook, HE: Healys Brook, SS: Sheepshearer Brook, CI: Cobby Irving Brook, BH: Black Hole Brook, WW: Woodworth Brook, RC: Ross Creek Brook).

Stream code / ST / NF / HE / SS / CI / BH / WW / RC
Physical/chemical / Catchment area (km2) / 7.8 / 3.0 / 4.9 / 7.4 / 4.1 / 8.5 / 10.6 / 6.5
Main stem length (km) / 5.3 / 4.0 / 4.4 / 5.3 / 3.1 / 5.9 / 6.9 / 5.0
Bank-full width (sampling site) (m) / 5.2 / 3.3 / 5.1 / 6.4 / 2.4 / 5.4 / 6.1 / 4.3
Gradient (%) / 4.2 / 4.8 / 4.5 / 3.7 / 4.4 / 3.6 / 3.0 / 3.5
Mean substrate diameter (cm) / 20.5 / 17.1 / 17.3 / 18.0 / 13.2 / 13.0 / 14.0 / 12.0
pH / 7.6 / 7.5 / 7.4 / 7.6 / 7.5 / 7.6 / 7.7 / 7.5
Silica (mg/L) / 5.5 / 8.0 / 4.2 / 7.3 / 10 / 11 / 9.1 / 13
Conductivity (μS/cm) / 158 / 133 / 86 / 114 / 80 / 65 / 111 / 64
Alkalinity (mg/L CaCO3) / 22 / 18 / 12 / 18 / 23 / 20 / 27 / 19
Canopy cover (%) / 55 / 83 / 58 / 92 / 90 / 56 / 59 / 94
Fish / Fish/m2 / 0.0 / 0.0 / 1.6 / 0.6 / 0.0 / 1.3 / 0.8 / 1.3
Biomass (g/m2) / 0.0 / 0.0 / 9.3 / 2.5 / 0.0 / 3.5 / 2.9 / 6.7
prey (#/trap/season) / Chironomidae / 14.5 / 23.7 / 33.4 / 45.6 / 26.6 / 63.2 / 47.6 / 10.4
SD / 0.7 / 8.1 / 8.4 / 2.8 / 27.2 / 8.4 / 10.9 / 5.9
Simuliidae / 0.3 / 0.5 / 0.2 / 0.4 / 0.4 / 0.5 / 0.2 / 1.0
SD / 0.0 / 0.3 / 0.3 / 0.6 / 0.4 / 0.7 / 0.2 / 1.1
Baetidae / 0.7 / 0.2 / 0.2 / 0.1 / 0.7 / 3.1 / 0.7 / 1.5
SD / 0.0 / 0.1 / 0.1 / 0.1 / 0.4 / 0.1 / 0.2 / 1.0
Heptageniidae / 6.7 / 3.1 / 2.4 / 1.4 / 5.3 / 2.2 / 3.2 / 21.9
SD / 1.0 / 1.0 / 1.2 / 0.3 / 4.4 / 0.3 / 0.9 / 27.9
Leptophlebiidae / 16.8 / 7.8 / 23.4 / 7.4 / 8.8 / 19.0 / 9.1 / 10.3
SD / 5.1 / 0.7 / 22.1 / 1.3 / 4.8 / 20.3 / 4.1 / 5.3
Leuctridae / 6.1 / 3.0 / 2.7 / 1.4 / 1.3 / 10.2 / 6.2 / 0.3
SD / 0.6 / 0.7 / 1.2 / 1.6 / 1.4 / 6.2 / 6.2 / 0.4
Nemouridae / 1.5 / 4.9 / 1.0 / 4.1 / 2.6 / 14.4 / 1.7 / 1.9
SD / 0.4 / 0.7 / 0.8 / 1.7 / 1.1 / 3.7 / 1.1 / 0.4

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Appendix 2. Abundance of invertebrate predators per trap (mean in unshaded column and standard deviation in shaded column, over two seasons) in each stream, and proportion of the guild composed of each family (Rhyacophilidae, Perlodidae, and Chloroperlidae). Streams are ordered from west to east (for stream codes see Appendix 1).

Site code / ST / NF / HE / SS / CI / BH / WW / RC
Rhyacophilidae / Rhyacophila / carolina / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.05 / 0.07 / 0.00 / 0.00 / 0.00 / 0.00
fuscula / 0.00 / 0.00 / 0.00 / 0.00 / 0.10 / 0.14 / 0.10 / 0.14 / 0.10 / 0.14 / 0.31 / 0.16 / 2.00 / 2.83 / 0.37 / 0.21
glaberrima / 0.00 / 0.00 / 0.20 / 0.28 / 0.00 / 0.00 / 0.00 / 0.00 / 0.10 / 0.14 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00
invaria / 0.00 / 0.00 / 0.10 / 0.14 / 0.00 / 0.00 / 0.10 / 0.14 / 0.05 / 0.07 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00
manistee / 0.00 / 0.00 / 0.10 / 0.14 / 0.00 / 0.00 / 0.10 / 0.14 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00
minor / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.10 / 0.14 / 0.86 / 1.04 / 0.40 / 0.57 / 1.62 / 1.73
vibox / 1.40 / 0.57 / 6.23 / 6.25 / 0.15 / 0.07 / 1.90 / 1.27 / 2.57 / 0.05 / 2.44 / 2.94 / 0.23 / 0.04 / 0.10 / 0.00
Proportion / 0.19 / 0.69 / 0.05 / 0.17 / 0.71 / 0.44 / 0.18 / 0.13
Perlodidae / Isoperla / bilineata / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.20 / 0.28 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.05 / 0.07
holochlora / 0.05 / 0.07 / 0.00 / 0.00 / 0.00 / 0.00 / 0.83 / 0.32 / 0.20 / 0.00 / 0.05 / 0.07 / 0.42 / 0.59 / 0.21 / 0.30
montana / 0.98 / 0.04 / 1.32 / 0.90 / 1.42 / 0.17 / 3.48 / 2.37 / 0.79 / 0.27 / 1.58 / 1.03 / 0.35 / 0.21 / 0.10 / 0.14
Proportion / 0.14 / 0.14 / 0.26 / 0.34 / 0.24 / 0.20 / 0.05 / 0.02
Chloroperlidae / Alloperla / banksi / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.05 / 0.07
caudata / 0.10 / 0.14 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.30 / 0.42 / 2.96 / 4.18
chloris / 0.20 / 0.28 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00
concolor / 0.00 / 0.00 / 0.13 / 0.18 / 0.05 / 0.07 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 1.35 / 0.21 / 4.34 / 3.62
idei / 1.60 / 1.70 / 0.00 / 0.00 / 0.55 / 0.49 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 3.13 / 0.18 / 0.00 / 0.00
petasata / 0.30 / 0.14 / 0.10 / 0.14 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.13 / 0.18 / 0.25 / 0.21
Sweltsa / lateralis / 0.00 / 0.00 / 0.10 / 0.14 / 0.00 / 0.00 / 0.20 / 0.28 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.35 / 0.21
naica / 0.05 / 0.07 / 0.00 / 0.00 / 0.18 / 0.11 / 0.00 / 0.00 / 0.00 / 0.00 / 0.38 / 0.18 / 1.90 / 2.69 / 2.69 / 2.60
onkos / 2.82 / 1.30 / 1.28 / 1.52 / 2.96 / 2.49 / 6.20 / 0.00 / 0.22 / 0.16 / 2.65 / 0.21 / 4.80 / 2.55 / 3.22 / 0.86
Proportion / 0.68 / 0.17 / 0.69 / 0.49 / 0.05 / 0.36 / 0.77 / 0.85

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