FIGURES
FIGURE 1 Species diversity values (± 84% CI) obtained by point
counters (blue points) and ARUs (pink and red points) across three
mountain habitats in British Columbia and southern Chile. Values
presented are species richness (Hill number (q) =0) and the effective
number of species calculated by the exponential of the Shannon-Wiener
Index (Hill number (q) =1). All values are interpolated/extrapolated to
97% sample completeness. Values for both hourly ARU counts (0-4 hrs
after dawn) and full morning ARU data, pooled, are presented. The grey
line between hourly points is a spline fit to aid in visualizing
potential temporal trends. Significant differences between methods are
indicated by a *
FIGURE 2 Species richness (q=0) accumulation curves for point
counts (blue) and ARUs (red) across three montane habitats in British
Columbia and in southern Chile (± 95% CI). Dashed lines indicate the
predicted final species richness obtained by each method with increased
effort. The solid orange line indicates the minimum community richness
based on multi-year habitat sampling (see Methods).
FIGURE 3 Efficiency of single-method and dual-method protocols
as the bootstrapped proportion of the community (mean ± SE) detected
with increasing monitoring hours across mountain habitats in British
Columbia (BC) and southern Chile. Species detections were summed across
all survey sites (BC: n=16-18 sites/habitat, Chile: n=10 sites/habitat)
for each level of effort. Point count returns (blue points) range in
effort from 1-3 counts/site and are labelled. The ARU only protocol (red
dashed curve) ranges in effort from 1-15 counts/site. Dual-method
protocols (purple curves) range from 1-15 ARU counts/site and vary in
point count effort as labelled.