Species identified by only one method
In BC, ARUs detected all of the species by point countplus an additional
16, or 28% of the total diversity detected by both methods (Table
S1(A)). Of these species, only Townsend’s solitaire (Myadestes
townsendi ) was detected frequently enough by ARUs to indicate that the
detection difference between methods was not due to chance (Fisher’s
exact test; P=0.02).
In Chile, 13 species, or 26% of the diversity captured by both methods,
were detected by point count observers but missed by ARUs (Table S1(B)).
Most of these were raptors (6/13) and ground-tyrants (5/13; Tyrannidae).
Of these 13 species, 5 were detected frequently enough by point counts
to indicate that the detection difference between methods was not a
product of chance (Fisher’s exact test; P<0.05). These species
were: Bar-winged cinclodes (Cinclodes fuscus), Dark-faced
ground-tyrant (Muscisaxicola maclovianus ), Spot-billed
ground-tyrant (M. maculirostris) , and Red-backed hawk
(Geranoetus polyosoma) . species, or 8% of the diversity captured
by both methods, were detected by ARUs but missed by point counts (Table
S1(B)). All of these species were nocturnal and all, with the exception
of the Austral pygmy owl (Glaucidium nana ), were detected only in
dawn ARU recordings. None were detected frequently enough to exclude the
possibility that the detection difference between methods was due to
chance.