Table 1 Macro- and microhabitat variables of nests of ground-nesting upland geese and flightless steamer ducks on Navarino Island, southernmost Chile (following Schüttler et al.28).
From: Adaptive response in waterbirds after mink introduction in subantarctic ecosystems
Nest variables | Description | Measurement |
|---|---|---|
Macrohabitat variables | ||
Distance | Shortest distance of nest to shoreline | Continuous (m) |
Habitat | Predominant type 10 × 10 m around the nest | (0) bare, (1) pasture, (2) shrubland, (3) forest |
Julian date | Days after the start of the studies (01 November) | Continuous (day) |
Shore | Shore type for each site | Rocky outcrop or sandy beach |
Slope | Incline of the shore within 10 m of the watershed | (1) flat (< 1 m), (2) medium (1–2 m), (3) steep (> 2 m) |
Microhabitat variables | ||
Height | Height of shrubs at the nest, estimated by hand palm | Continuous (cm) |
Side cover | Percentage nest concealment from side | (1) 0–24%, (2) 25–50%, (3) 51–75%, (4) > 75% |
Top cover | Percentage nest concealment from above | (1) 0–24%, (2) 25–50%, (3) 51–75%, (4) > 75% |
