Songs of the Red-capped Robin, <i>Petroica goodenovii:</i> comparison of acoustic features in island and mainland populations

Baker, Myron Charles; Baker, Esther M.; Baker, Merrill S. A.

doi:10.1071/mu03004

Cited by 9 publications

(7 citation statements)

References 12 publications

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“…The present study describes the songs of three species of songbirds that occupy mainland Australia and Rottnest Island, 20 km offshore from Perth, Western Australia. Some aspects of the song patterns found in mainland and Rottnest populations of the three species have been reported previously (Baker, 1996; Baker, Baker & Baker, 2001; Baker, Baker & Baker, 2003a, 2003b). We expand on this previous research by reporting new data collected in populations not sampled earlier, and by re‐sampling some sites.…”

Section: Introductionsupporting

confidence: 69%

“…Dryandra Woodland State Forest and Rottnest Island were the only two areas sampled in an earlier study, October 1998 (Baker et al ., 2003b), that were re‐sampled in 2004. From visual inspection of sonograms made from song samples in these two sites in 2004, no obvious changes in song patterns were observed.…”

Section: Resultsmentioning

confidence: 99%

“…A number of studies comparing island and mainland populations of songbirds have found less complexity in island songs compared with those of mainland conspecifics (Thielcke, 1973; Baptista & Johnson, 1982; Kroodsma, 1985; Baker & Jenkins, 1987; Milder & Schreiber, 1989; Naugler & Smith, 1991; Schottler, 1995; Baker, 1996; Hamao & Ueda, 2000; Baker et al ., 2001; Baker et al ., 2003a, b) or a greater degree of sharing in the island population (Lachlan & Slater, 2003). Whereas authors of such findings often raise the hypothesis of founder effect as causation of the pattern, direct evidence is lacking because the process has not been documented by recording early colonists and following the process through time.…”

Section: Discussionmentioning

confidence: 99%

“…These measured acoustic values are then used when comparing the vocalizations of two individuals to obtain a measure of similarity. This analysis technique has been described in detail elsewhere (Tchernichovski et al ., 2000; Baker & Logue, 2003; Baker et al ., 2003b; Tchernichovski & Mitra, 2004).…”

Section: Methodsmentioning

confidence: 99%

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Differing effects of isolation on evolution of bird songs: examples from an island-mainland comparison of three species

Baker

Baker²,

Tilghman³

2006

Biological Journal of the Linnean Society

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The present study investigated the effects of island isolation on songs of three species of Australian songbirds. The characteristics of songs recorded from mainland locations were compared with those recorded on Rottnest Island off the coast of Western Australia. In all three species, the characteristics of the island song patterns differed from those on the mainland. Each species exhibited a different kind of divergence on the island, including (1) differences in the structure of individual notes and syllables constituting songs; (2) differences in temporal patterns of song delivery; and (3) differences in the order of notes within songs. In two species, the island songs were less complex than mainland songs and this may be the consequence of a founder effect. In the third species, island songs were more elaborate and diverse, and this may be the consequence of sexual selection, although other explanations are plausible. For several of these populations, quantitative comparisons were made between samples collected 6-7 years apart. In two species, new recordings made in 2004 were compared with those made in 1998 and, in one species, recordings made in 1991 were compared with those made in 1998. For the nine comparisons available, similarity scores across years did not change significantly; thus, there was no evidence of systematic divergence with time.

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Section: Introductionsupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Differing effects of isolation on evolution of bird songs: examples from an island-mainland comparison of three species

Baker

Baker²,

Tilghman³

2006

Biological Journal of the Linnean Society

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“…A‐notes of mainland songs and D‐notes of Rottnest songs appear similar, however. The pattern of song production on Rottnest is that of a single song, contrasting with the doublet form predominating in mainland songs (Baker et al. 2003a; M. C. Baker et al unpubl.…”

Section: Resultsmentioning

confidence: 99%

Differentiation of Mating Vocalizations in Birds: Acoustic Features in Mainland and Island Populations and Evidence of Habitat‐Dependent Selection on Songs

Baker

2006

Ethology

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Local environments can act as selective agents on some characteristics of birds’ songs, whereas other song traits may not reflect local genetic adaptation. Geographic variation in songs of two Australian bird species (red‐capped robins Petroica goodenovii, western gerygones Gerygone fusca) was studied to examine one component of the ‘habitat‐dependent selection’ hypothesis. This hypothesis suggests that: (1) the detailed spectral characteristics of male songs are an evolved response to local habitat conditions affecting signal propagation and detection and (2) parallel evolution of other fitness traits sets up the potential for assortative mating by female choice. To examine the first part of the hypothesis, I made comparisons among widespread mainland populations and an island population using two levels of analysis: a typological analysis of song morphology (phonology: notes, syllables, syntax, temporal pattern, repertoires) and a spectral analysis of acoustic characteristics of songs (mean frequency, Wiener entropy, frequency modulation) using an automated procedure of feature extraction (Sound Analysis Pro). Spectral analysis was also used to extract values of the same acoustic features from the background sound environment of each recorded population. The typological analysis revealed no differences among mainland populations of either species, but large differences between mainland songs and those on the island. In contrast, the spectral analysis revealed acoustic divergence among populations, both mainland and island. For both species, Wiener entropy of songs correlated negatively with that of the ambient sound environment, consistent with predictions of the habitat‐dependent selection hypothesis of environmental selection on signal design.

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Geographical variation in song frequency and structure: the effects of vicariant isolation, habitat type and body size

2007

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Songs of the Red-capped Robin, Petroica goodenovii: comparison of acoustic features in island and mainland populations

Cited by 9 publications

References 12 publications

Differing effects of isolation on evolution of bird songs: examples from an island-mainland comparison of three species

Differing effects of isolation on evolution of bird songs: examples from an island-mainland comparison of three species

Differentiation of Mating Vocalizations in Birds: Acoustic Features in Mainland and Island Populations and Evidence of Habitat‐Dependent Selection on Songs

Geographical variation in song frequency and structure: the effects of vicariant isolation, habitat type and body size

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