Point Counts
Surveys started at sunrise and ran until 1000to encompass peak bird
activity. Each mountain was surveyed using transects with five point
counts in each of the three habitat types for a total of 15 point counts
per mountain. Point counts were separated by 200 m to avoid repeat
counts of birds. During each 6-minute point count, bird species and
abundance was assessed by sight and sound with distance from the count
centre recorded at four intervals (0-25 m, 26-50 m, 51-100 m,
>100m). Counts were repeated three times: between May 30 –
July 16 in BC, and between November 7 – December 21 in Chile to assess
detection probability and address seasonal variation in detection.