A comparison of vocalisations between mainland tui (Prosthemadera novaeseelandiae novaeseelandiae) and Chatham Island tui (P. n. chathamensis)

摘要: Vocalisations are important for territorial defence, mate attraction, and species recognition in many songbirds. Comparative studies on the songs of birds between islands mainland populations provide insight into evolution vocal communication terms both ecological social factors. We compared vocalisations tui (Prosthemadera novaeseelandiae novaeseelandiae), an endemic honeyeater from New Zealand's mainland, with those a subspecies remote Chatham Islands (P. n. chathamensis). Song spectral variables male long-range 'broadcasting' differed Island populations. Songs recorded five had significantly greater syllable diversity produced higher percentage trills than Islands. These characteristics have been revealed past as being sexually selected traits positively correlated genetic diversity. The acoustic adaptation hypothesis could also help to elucidate presence trill components population, study sites general contained more areas open vegetation, where transmit effectively dense forest, which dominated sampling Future research variation song complexity relation population size, geographic isolation, habitat structure different would further links selective pressures complexity.