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• W2740139638 abstract "Male Rufous Scrub-birds Atrichornis rufescens have loud characteristic calls which can be used to locate territories. The effectiveness of a monitoring program based on the detection of calling birds is dependent on good understandings of how their calling patterns vary with season, time of day, and local conditions. Since the presence of observers can affect a scrub-bird’s behaviour, a non-intrusive method for investigating the calling patterns would have advantages. This study describes the development of a nonintrusive censusing method using a digital recording device programmed to record sonograms at a known or potential territory at pre-determined times, with the sonogram data analysed after they are later recovered from the instrument. Some progress has been made towards automated electronic analysis of the data using a “recogniser” developed from previously recorded “chipping” calls of a male Rufous Scrub-bird. A male Rufous Scrub-bird was found to call very frequently in September, at the start of what is generally considered to be the breeding season. Its frequency of calling decreased outside the breeding season. The seasonal calling patterns for this scrub-bird were similar to those identified 30 years earlier. Sonogram analysis of the characteristic chipping call of the Rufous Scrub-bird has shown that the first two syllables of a phrase have a narrower frequency range (less low frequency contribution) than the subsequent syllables, and the interval between the first and second syllables is greater than the intervals between each subsequent syllable. The numbers of syllables within individual phrases in a bout were often found to increase, from 1-3 syllables initially to 6-8 (or more) syllables later. This study has also confirmed previous findings that the individual syllables may be either downwardly or upwardly inflected, but that all the syllables in a phrase have the same inflection." @default.
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• W2740139638 date "2012-01-01" @default.
• W2740139638 modified "2023-09-23" @default.
• W2740139638 title "Development of a non-intrusive method for investigating the calling patterns of Rufous Scrub-birds" @default.
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