Abiotic Variables
During each point count, we collected abiotic information within a 50 m buffer of the point count site. We collected temperature and wind speed using Kestrel 3500 weather meters (Nielsen-Kellerman Company, PA, USA). We also recorded wind as a categorical variable (0-3). Additionally, we recorded percent canopy, understory (vegetation ~30cm in height), shrub, tundra, snow, and rock cover and the percentage of the ground covered with dead trees. Deciduous trees were more common in the canopy in Chile than in BC. Canopy cover values in Chile therefore increased with leaf-out during the season while values in BC were static.
For each ARU count we also scored wind on the Beaufort scale (0 – 3) based on its interference with the audio recording.