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Table 1
Overview and definition of functional traits (FTR1 to FTR4, FTRi) in coarse surface sediments and the hyporheic zone, with examples of characteristic oligochaete taxa.
| Functional traits FTRs | Examples of characteristic taxa |
|---|---|
| FTR1: Includes active exchange describer (AED) species, i.e. species indicating active hydrologic exchanges between surface waters and groundwater | All Lumbriculidae (Trichodrilus spp., Stylodrilus spp., etc.) except Lumbriculus variegatus, Haber spp., Pristina spp., Cernosvitoviella spp., Achaeta spp., Marionina argentea, Haplotaxis gordioides, Propappus volki, Chaetogaster parvus |
| FTR2: Includes oligochaete species which are intolerant to chemical pollution | Cernosvitoviella spp., Marionina argentea, Eiseniella tetraedra, Nais alpina, Vejdovskyella comata, Stylodrilus heringianus, Rhyacodrilus falciformis, Propappus volki, Haplotaxis gordioides |
| FTR3: Includes oligochaete species which are tolerant to chemical pollution | Nais elinguis, Pristina jenkinae, Dero digitata, Globulidrilus riparius, Lumbriculus variegatus |
| FTR4: Includes oligochaete species which indicate the presence of polluted sludge within sediment interstices (“sludge effect”) | Tubificinae with or without hair setae, Lophochaeta ignota, Tubifex tubifex, Limnodrilus hoffmeisteri, Bothrioneurum sp., Lumbricillus spp |
| FTRi: Includes oligochaete species which are moderately tolerant to chemical pollutions | Chaetogaster diastrophus, C. diaphanus, Nais communis, N. christinae, N. barbata, N. pardalis, Slavina appendiculata |
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