calls (hooting) of two tawny owl subspecies, Strix aluco aluco(the eastern European subspecies) and Strix aluco willkonskii(the Caucasian
subspecies), were recorded from October 2007 to February 2013, to study
variation between individuals and subspecies. Calls of the eastern European
subspecies were recorded in Moscow region (Russia) and “Gomolshanskie Lesa”
National Park (Ukraine). Males of the Caucasian subspecies were recorded in
“Bolshoi Utrish” Reserve and “Sochinskii” National Park (Russia). The
territorial calls of the eastern European and Caucasian subspecies are compared
for the first time. The discriminatory accuracy of individual calls reached 98%
for S. a. alucoand 77% for S. a. willkonskiiwhen accounting for
six frequency and temporal parameters of their call. We found the call of the
two subspecies to differ in half of the acoustic parameters considered,
suggesting that macrogeographic variation between the Eastern European
and Caucasian subspecies may have taken place.
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