Appendix 2. Data nodes of the food web, including code (ID), functional feeding group and abundance (%) of each node in the environment and diet composition. *Not identified. **Prey category present in the guts but not quantified. Coarse particulate organic matter (CPOM) and fine particulate organic matter (FPOM).

ID / Functional feeding group / Prey availability / Diet of fish species / Ontogenetic diet of S. trutta
Benthos / Drift / P. duriense / S. trutta / S. carolitertii / L. bocagei / Age-0 / Age-1 / Age-2 / Age-3
Trophic base
CPOM / 1 / - / - / - / ** / - / - / - / - / - / - / -
FPOM / 15 / - / - / - / ** / - / ** / ** / - / - / - / -
Periphyton / 33 / - / - / - / ** / - / - / - / - / - / - / -
Aquatic invertebrates
Dugesia spp. / 35 / Predator / 1.9 / - / - / - / - / - / - / - / - / -
Lumbriculidae* / 16 / Collector / 0.1 / - / - / 0.2 / - / - / 0.26 / - / - / -
Ancylus fluviatilis / 34 / Scraper / 0.8 / 0.9 / - / 0.5 / - / - / - / 0.68 / 2.78 / -
Hydracharina* / 41 / Predator / 0.1 / - / - / 0.8 / 6.7 / - / 0.53 / 1.36 / 1.39 / -
Copepoda* / 42 / - / - / - / - / - / 0.3 / - / - / - / - / -
Baetis spp. / 17 / Collector / 19 / 7.6 / 42.1 / 56 / 46.6 / 20.3 / 68.95 / 29.93 / 43.06 / 47.06
Ephemerella spp. / 2 / Collector / 3.4 / 1.3 / - / - / - / - / - / - / - / -
Ecdyonurus spp. / 3 / Scraper/collector / 3.3 / 1.8 / 0.2 / 2.6 / - / - / 1.05 / 3.4 / 9.72 / -
Epeorus spp. / 4 / Scraper/collector / 29.6 / 1.8 / 2.2 / 6.2 / 2.7 / - / 10 / - / - / -
Habrophlebia sp. / 18 / Collector/shredder / 0.1 / - / - / - / 0.5 / - / - / - / - / -
Leuctra geniculata / 19 / Collector/scraper / 2 / 1.8 / 0.5 / - / 0.3 / - / - / - / - / -
Perla sp. / 20 / Predator / 0.1 / - / - / - / - / - / - / - / -
Boyeria irene / 36 / Predator / 0.1 / - / - / - / - / - / - / - / -
Ophiogomphus sp. / 37 / Predator / 0.4 / 0.9 / - / 0.5 / - / - / - / - / 4.17 / -
Aphelocheirus aestivalis / 38 / Predator / 1.2 / 0.4 / - / 0.5 / 0.8 / 2.7 / - / 2.04 / - / -
Micronecta sp. / 21 / Predator / - / 0.4 / 0.2 / 0.3 / - / - / - / - / 2.78 / -
Gerris lacustris / 45 / Predator / - / - / - / 0.2 / - / - / - / - / 1.39 / -
Elmis sp. / 22 / Scraper/collector / 0.3 / 0.4 / - / - / 0.5 / 1.4 / - / - / - / -
Macronychus sp. / 23 / Scraper/collector / 1.2 / 0.4 / - / - / - / - / - / - / - / -
Oulimnius sp. / 24 / Scraper/collector / - / 0.4 / - / - / - / - / - / - / - / -
Esolus spp. / 25 / Scraper/collector / 0.9 / - / - / - / - / - / - / - / - / -
Orectochilus sp. / 39 / Predator / - / 0.4 / - / 0.3 / - / - / - / 1.36 / - / -
Hydraena sp. / 5 / Shredder/scraper / 0.2 / - / - / - / - / - / - / - / - / -
Micrasema sp. / 6 / Predator/filterer / 0.6 / - / - / - / - / - / - / - / - / -
Hydropsyche spp. / 26 / Filterer / 11.2 / 4 / 0.7 / 2 / 2.4 / 17.6 / 1.32 / 4.76 / - / -
Leptoceridae* / 7 / Shredder / - / - / - / 0.2 / 0.3 / - / - / 0.68 / - / -
Lepidostoma sp. / 8 / Shredder / 0.1 / - / - / - / - / - / - / - / - / -
Allogamus sp. / 9 / Shredder / 0.2 / 0.4 / - / 2.3 / 2.2 / 4.1 / - / 4.76 / 6.94 / 11.76
Chimarra marginata / 27 / Filterer/collector / 3.3 / 0.9 / 0.5 / 0.2 / 0.3 / - / 0.26 / - / - / -
Polycentropus sp. / 28 / Predator / 0.3 / - / - / 0.2 / 1.1 / - / - / 0.68 / - / -
Rhyacophila spp. / 43 / Predator / 2.9 / 1.3 / 0.7 / 3.4 / 1.6 / 21.6 / 3.42 / 4.08 / 2.78 / -
Atherix sp. / 44 / Predator / 0.7 / 0.9 / - / 0.2 / - / - / 0.26 / - / - / -
Tanypodinae* / 29 / Predator / 3.1 / 3.6 / 1.5 / 2.6 / 3 / 32.4 / 1.84 / 5.44 / - / 5.88
Orthocladiinae* / 10 / Collector / 0.9 / - / - / - / - / - / - / - / - / -
Clinocerinae* / 46 / Predator / 0.1 / - / - / - / - / - / - / - / - / -
Tipulidae* / 11 / Shredder / - / 0.4 / - / - / - / - / - / - / - / -
Prosimuliini* / 30 / Filterer / 12.3 / 66.2 / 49.8 / 9.1 / 22.9 / - / 8.16 / 15.65 / - / 11.76
Terrestrial invertebrates
Trichoptera* / 47 / - / - / 0.4 / - / 5 / 1.9 / - / 0.26 / 8.84 / 19.44 / 17.65
Ephemeroptera* / 50 / - / - / - / - / 3.7 / 0.5 / - / 3.16 / 6.8 / 1.39 / -
Asilidae* / 48 / - / - / 0.4 / - / - / - / - / - / - / - / -
Chironomidae* / 51 / - / - / 0.4 / - / 0.3 / - / - / - / 1.36 / - / -
Empididae* / 52 / - / - / - / - / 0.2 / - / - / - / 0.68 / - / -
Simuliidae* / 53 / - / - / 1.8 / - / 0.3 / - / - / 0.26 / 0.68 / - / -
Diptera* / 54 / - / - / - / 0.2 / - / 0.5 / - / - / - / - / -
Formicidae* / 12 / - / - / 0.4 / 1 / 2.1 / 3.2 / - / 0.26 / 6.8 / 2.78 / -
Coleoptera* / 13 / - / - / - / 0.2 / 0.2 / 0.5 / - / - / - / 1.39 / -
Arachnida* / 49 / - / - / - / - / - / 0.8 / - / - / - / - / -
Fish species
P. duriense / 14 / - / - / - / - / 0.2 / 0.3 / - / - / - / - / 5.88
S. trutta / 40 / - / - / - / - / - / - / - / - / - / - / -
S. carolitertii / 31 / - / - / - / - / - / - / - / - / - / - / -
L. bocagei / 32 / - / - / - / - / - / - / - / - / - / - / -