TABLE 1.
Environmental variables used to predict fish assemblage composition in Amazonian stream sites
| Environmental predictor variables | ||
|---|---|---|
| Group | Code | Definition |
| Riparian | NET_FOR | % riparian network forest |
| LOC_FOR | % local riparian forest | |
| W1_HALL | Proximity weighted tally of riparian/stream side disturbances (Kaufmann et al., 1999) | |
| Catchment | CAT_FOR | % catchment forest |
| CAT_MAG | % mechanized agriculture | |
| DEN_RCS | Number of road crossings within a 5 km circular buffer upstream and downstream the stream site divided by catchment area | |
| Instream habitat | Water quality | |
| TEMP | Water temperature (°C) | |
| COND | Electrical conductivity (μ/cm) | |
| Substrate | ||
| FINE | Streambed surficial fines <0.6 mm diameter—% areal cover | |
| Cover and wood | ||
| AMCV | In-channel algae and macrophytes—% areal cover | |
| NTCV | In-channel natural cover (wood, live trees and roots, leaf packs, overhanging vegetation, undercut banks, boulders)—% areal cover | |
| WOOD | Wood volume—m3/m2 wetted channel area | |
| Channel morphology | ||
| DPTH | Standard deviation of thalweg depth (cm) | |
| BKWD | Ratio: Bankfull width to bankfull thalweg depth—dimensionless | |
| RP100 | Mean residual depth at thalweg ([m2/m]/cm) | |
| Other | ||
| LRBS | Log10 of relative bed stability estimated at bankfull flow conditions (Kaufmann, Faustini, Larsen, & Shirazi, 2008; Kaufmann, Larsen & Faustini 2009) | |
| SHAD | Canopy density (shading) measured at mid-channel (%) | |
| Natural | CAT_ARE | Catchment area (ha) |
| CAT_SLO | Catchment slope | |
| DST_RIV | Distance to large river (≥4th Strahler order) (m) | |