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Table 1 Environmental variables used in models

From: Contribution of citizen science towards cryptic species census: “many eyes” define wintering range of the Scaly-sided Merganser in mainland China

Category Variable Description
Hydrogeomorphic Ele_COV Coefficient of variation of elevation within a 1 km × 1 km window
DEM Mean elevation within a 1 km × 1 km window
Dist_w Distance to waterbodies (larger than 1 km2) weighted by DEM
Dist_rv Distance to river weighted by DEM
RvDen River density
Human disturbance Dist_nat Distance to protected areas weighted by DEM
Dist_rd Distance to roads weighted by DEM
Dist_town Distance to settlement weighted by DEM
DamDEN Dam density
Land productivity COV Coefficient of variation of monthly NDVI in a year, i.e. NDVI seasonality
NDVI.Max Maximum NDVI in a year
NDVI.Mean Mean monthly NDVI in a year
NDVI.Min Minimum NDVI in a year
  1. Hydrogeomorphic and human disturbance variables were scaled so that the values were between 0 and 1