Western Greenish Warbler Phylloscopus trochiloides viridanus and Green Warbler Ph. (t.) nitidus show different ways of increase in song complexityстатья
Дата последнего поиска статьи во внешних источниках: 20 апреля 2022 г.
Место издания:Scientific Programme Committee and the Local Organising Committee (Hessian Society for Ornithology and Nature Conservation (HGON) and Behavioural Ecology & Ecophysiology group, Justus-Liebig University
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Аннотация:We made a comparative analysis of male singing in Western Greenish Warbler Phylloscopus trochiloides viridanus and Green Warbler Ph. (t.) nitidus. The Green Warbler has an isolated breeding range in Caucasus, Transcaucasia and Asia Minor; we recorded its vocalization in Krasnodar region in 2018–2019. The other subspecies is spread from C Asia to W Siberia, E and N Europe; we made records in Moscow and Kaluga regions in 2017–2019. All forms of the Greenish Warbler complex have a discrete manner of singing. Its structural unit is a stable sequence of elements that we call vocal unit, and a series of merged units called vocal composition. We described song structure, population and individual repertoires and spectra-temporal characteristics of singing. There were 13 types of vocal units in the population repertoire of form viridanus and over 40 in nitidus. Their upper frequencies were similar, but lower ones were higher in nitidus. The latter had significantly shorter units: however, the median number of unique notes per unit did not differ, because singing of viridanus often contained repeated elements. In both forms, most elements were specific to a unit type. The order of vocal units in compositions was rather strict in Western Greenish Warbler and flexible in Green Warbler, so the males of the latter form had a greater variety of vocal compositions, even with a similar median value of vocal unit repertoire. Both forms rarely repeated same vocal unit in a composition, and we found no differences in median duration of vocal compositions.
