NDLI: Response of reed warbler and sedge warbler to acoustic playback in relation to age, sex, and body condition

Content Provider	Springer Nature Link
Author	Wojczulanis Jakubas, Katarzyna Wietrzykowski, Jakub Jakubas, Dariusz
Copyright Year	2015
Abstract	Acoustic playback has been shown to substantially increase the number of birds trapped. However, other effects of playback have rarely been investigated; the few studies that have been published strongly suggest that when playback is applied some groups of birds may be captured more easily than others, leading to biased results. In this study, we evaluated the experimental effect of acoustic playback (by comparing days when playback was used and was not used) at a stop-over site in central Europe during the post breeding period and the autumn migration. We examined the influence of playback on numbers of birds captured, i.e., two reedbed passerines—the reed warbler Acrocephalus scirpaceus (RW) and the sedge warbler A. schoenobaenus (SW)—with respect to their age, sex and body condition. We found that playback increased the number of birds captured 2.5 times in RW and 3.6 in SW. We did not find evidence for a differentiated response to the acoustic stimuli between adults and immatures. The sex ratio in RW was not affected by acoustic playback, but we did record significant male-bias in SW. The body condition of lured and non-lured birds was similar in both species. The sex bias revealed in one species but not in the other, clearly shows that great caution should be exercised when using playback to attract various species. Die Antwort von Teich- und Schilfrohrsängern auf akustisches Playback in Hinsicht auf Alter, Geschlecht und Körperkondition Es ist gezeigt worden, dass akustisches Playback die Anzahl gefangener Vögel deutlich erhöht. Andere Effekte von Playback sind jedoch kaum untersucht worden; die wenigen hierzu veröffentlichten Untersuchungen deuten stark darauf hin, dass mit Hilfe von Playback einige Vogelgruppen leichter gefangen werden können als andere, was zu verfälschten Ergebnissen führt. In dieser Studie haben wir in einem mitteleuropäischen Rastgebiet in der Zeit nach der Brut und während des Herbstzuges den experimentellen Effekt akustischen Playbacks durch das Vergleichen von Tagen mit und ohne Playback untersucht. Wir haben den Einfluss von Playback auf die Anzahl gefangener Teich- (Acrocephalus scirpaceus; RW) und Schilfrohrsänger (A. schoenobaenus; SW) in Hinsicht auf Alter, Geschlecht und Körperkondition analysiert. Wir fanden heraus, dass Playback die Anzahl gefangener RW um das 2,5-fache und die gefangener SW um das 3,6-fache erhöhte. Wir fanden keine Hinweise darauf, dass Altvögel und immature Vögel auf die akustischen Stimuli unterschiedlich reagieren. Das Geschlechterverhältnis gefangener RW wurde durch das Playback nicht verschoben, während wir bei SW mit Playback signifikant mehr Männchen fingen. Die Körperkondition von mit und ohne Playback gefangenen Vögeln war bei beiden Arten ähnlich. Dass bei einer der beiden untersuchten Arten (nicht jedoch bei der anderen) ein Geschlecht häufiger mit Hilfe von Playback gefangen wurde als das andere, zeigt deutlich, dass man Vorsicht walten lassen sollte, wenn man Playback einsetzt, um verschiedene Vogelarten anzulocken.
Starting Page	137
Ending Page	143
Page Count	7
File Format	PDF
ISSN	21937192
Journal	Journal für Ornithologie
Volume Number	157
Issue Number	1
e-ISSN	21937206
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Playback Sex ratio Migration Stop-over Zoology Ecology Fish & Wildlife Biology & Management
Content Type	Text
Resource Type	Article

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