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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