Acoustic identification of individual Rufous Bristlebirds, a threatened
species with complex song repertoires
Daniel J. Rogers A , B and David C. Paton A
A Discipline of Environmental Biology, School of Earth and Environmental
Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
B Corresponding author. Email:
Abstract
Rufous Bristlebirds (Dasyornis broadbenti), possess song repertoires of
between 12 and 30 different song-types, only a proportion of which are
shared between different individuals. As a result, the comparison of songs
among individuals is complicated by the use of multiple song-types. Using
both discriminant function analysis (DFA) and spectrographic
cross-correlation analysis (SPCC), those song-types that were shared among
individuals demonstrated high levels of vocal individuality. DFA correctly
classified an average of 98.3 ± 1.2% of male songs, whereas SPCC correctly
classified an average of 87.4 ± 2.8% of songs. However, common song
features among song-types showed limited value for individual
identification. The information provided by the SPCC analyses was then used
to discriminate among individuals over a distance of 7.8 km, the results of
which supported those of previous studies with regard to the sedentary
nature of Bristlebirds. Although the results of the presen!
t study show promise, the issue of song comparisons among multiple
song-types remains a significant challenge for the development of acoustic
identification systems for this species.
EMU 105(3) 203-210
Published: 12 October 2005
Full text DOI: 10.1071/MU05040
© Royal Australasian Ornithologists Union 2005
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Geographic variation in advertisement calls of Crinia signifera (Anura :
Myobatrachidae) in the Bass Strait area of south-eastern Australia
M. J. Littlejohn
Department of Zoology, University of Melbourne, Vic. 3010, Australia.
Email:
Abstract
The structure of recorded advertisement calls of a total of 176 males of
Crinia signifera from eight localities on the south-eastern Australian
mainland and Tasmania was investigated. On the basis of number of pulses
per call (samples from all localities) and call duration adjusted to 13.0°C
(samples from six localities), two geographic groups are recognised: (1)
south-central Victoria, and (2) the extreme south-eastern mainland and
Tasmania. This pattern of variation is postulated to reflect expansion of a
differentiated Tasmanian stock on to the extreme south-eastern Australian
mainland along the eastern sill of the Bassian Isthmus during the lower sea
levels of the Late Pleistocene. Geographic variation in pulse rate (derived
from number of pulses and call duration) was also considered because of its
use in previous studies. The variation in dominant frequency in samples
from five localities, adjusted for snout-vent length, does not conform to
that for number of pulses an!
d call duration, and is attributed to differences in demographic structure
and recruitment.
Australian Journal of Zoology 53(4) 221-228
Published: 6 September 2005
Full text DOI: 10.1071/ZO04060
© CSIRO 2005
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