Juvenile dispersal in Reed Warblers Acrocephalus scirpaceus at night

Bulyuk, Victor N.; Mukhin, Andrey; Fedorov, Vladimir A.; Tsvey, Arseny; Kishkinev, Dmitry

Abstract

The aim of this study was to test whether juvenile dispersal in Reed Warblers Acrocephalus scirpaceus takes place at night. If this does occur then the questions arise: “in which part of the night, at what age and physiological condition do they disperse?” In 1999 on the Courish Spit on the Baltic we ringed large numbers of Reed Warbler pulli at three isolated reedbed sites. Each night from late July until mid September we tape-lured Reed Warblers in a habitat atypical of this species. The trapping site was nearly equidistant from the two main plots where pulli were ringed. Additionally, in 1997-1999 at one of the reedbed study sites Reed Warblers starting and ending nocturnal flights were captured in high nets while at the same site, during the daytime, birds were trapped in standard mist nets. Our results suggest that juvenile dispersal of Reed Warblers takes place at night. The analysis of capture histories of ten birds ringed as pulli or just after fledging shows that: (1) age of birds during nocturnal movements was 33-49 days; (2) birds moved towards the NE and SW mainly during the last two hours before sunrise; (3) flight duration did not exceed 75 min; (4) all birds had low fuel stores and were in active moult; (5) nocturnal juvenile dispersal occurs by movements from one isolated reedbed area to another.

Citation

Bulyuk, V. N., Mukhin, A., Fedorov, V. A., Tsvey, A., & Kishkinev, D. (2000). Juvenile dispersal in Reed Warblers Acrocephalus scirpaceus at night. Avian Ecology and Behaviour, 5, 45-61

• Journal Article Type: Article
• Acceptance Date: Nov 25, 2000
• Publication Date: 2000
• Deposit Date: May 14, 2024
• Journal: Avian Ecology and Behaviour
• Print ISSN: 1561-9958
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Pages: 45-61
• Keywords: juvenile dispersal, Reed Warbler, tape luring, nocturnality, post-fledging movements, migration
• Public URL: https://keele-repository.worktribe.com/output/827637
• Publisher URL: https://www.zin.ru/journals/aeb/pdf/Bulyuk_2000_5_AEB.pdf
• Related Public URLs: https://www.zin.ru/journals/aeb/