| ANmodulation {IDmeasurer} | R Documentation |
Little owl, Athene noctua - frequency modulation
Description
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Species: Little owl, Athene noctua
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Number of individuals: 33
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Number of calls per individual: 10
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Number of acoustic variables: 11
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Individual identity: HS=3.48
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Reference: Linhart, P., & Salek, M. (2017). The assessment of biases in the acoustic discrimination of individuals. PLOS ONE, 12(5), e0177206. doi:10.1371/journal.pone.0177206
Calls of little owls were collected in Czech Republic and Hungary.
Territorial calls of each male were recorded for three minutes after a short
playback provocation (1 min) inside their territories from up to 50 m
distance from the individuals. The recordings were made during comparable,
favourable meteorological conditions (without strong wind or precipitation),
from sunset until midnight between March and April of 2013 and 2014. This period
covered the mating season. The period and the time of the day for recording
were selected with regard to the peak in vocal activity of little owls both
within a day and within a season. The original dataset included 54 males with
more than 20 calls each (20-41 calls per individual, mean, SD = 26.9, 6.0)
with good recording quality.The number of individuals and calls per
individual was reduced to match parameters of the other datasets.
Eleven variables were measured to describe the modulation of the fundamental
frequency within the call (shape of the call on spectrogram) and the duration
of the call. Fundamental frequency was measured at ten measuring points
spread equidistantly throughout the call duration. Variables were extracted
in SASLab Pro by Avisoft.
Usage
ANmodulation
Format
A data frame with 330 rows and 12 variables:
- id
factor, identity code of an individual emitting the call
- f1, f3, f5, f7, f9, f11, f13, f15, f17, f19
fundamental frequency at the specific measuring point, in Hertz
- dur
numeric, duration of the call, in seconds