Abstract
Many territorial animals are less aggressive towards neighbours than to strangers, a phenomenon known as the ‘dear enemy effect’. However, there has been little research on changes in this behaviour in songbirds across the breeding season. In this study, we followed changes in the dear enemy effect during the breeding season in Great Tits, Parus major. We simulated neighbour and stranger intrusions at three breeding stages corresponding to key ecological and social situations, egg-laying, incubation and nestling stages, and examined the territorial songs and physical responses of territory owners. Our results suggest that neighbours are dear enemies in the egg-laying and incubation stages, when territories are stable, but not at the nestling stage when territories become unstable. In addition, physical responses were more effective as warning signals than territorial songs when dear enemy effects were expressed. We conclude that the dear enemy effect is expressed flexibly, rather than in a fixed way, by territorial male Great Tits in our study area.
Zusammenfassung
Männliche Kohlmeisen (Parus major) stimmen die Ausprägung des „Lieber-Feind-Effekts“ auf das Brutstadium ab
Viele territoriale Tiere sind gegenüber Nachbarn weniger aggressiv als gegenüber fremden Artgenossen, ein Phänomen, das als „Lieber-Feind-Effekt“ bekannt ist. Allerdings haben nur wenige Studien untersucht, inwieweit sich dieser Effekt im Laufe der Brutsaison verändert. In der vorliegenden Studie haben wir Veränderungen im „Lieber-Feind-Effekt“ im Laufe der Brutsaison bei Kohlmeisen, Parus major, untersucht. Wir haben das Eindringen von Nachbarn und fremden Tieren ins Revier simuliert, in drei verschiedenen Brutstadien, die entscheidenden ökologischen und sozialen Situationen entsprechen, nämlich Lege-, Bebrütungs- und Nestlingsstadium, und haben die Reviergesänge und körperlichen Antworten von Revierinhabern untersucht. Unsere Ergebnisse deuten darauf hin, dass Nachbarn während des Lege- und Bebrütungsstadiums, wenn die Reviergrenzen stabil sind, als „liebe Feinde“ betrachtet werden, nicht jedoch während des Nestlingsstadiums, wenn die Reviergrenzen instabil werden. Außerdem waren körperliche Antworten effektivere Warnsignale als Reviergesänge, wenn der „Lieber-Feind-Effekt“ zum Ausdruck gebracht wurde. Wir schlussfolgern, dass bei territorialen männlichen Kohlmeisen in unserem Untersuchungsgebiet der „Lieber-Feind-Effekt“ flexibel und nicht starr ausgeprägt ist.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (Grant Nos. 31570390, 31770419), and a project funded by China Postdoctoral Science Foundation (2018M631854). We thank Hongwei Xu and Yusheng Wei for their invaluable field assistance. We thank Harry Taylor, PhD, from Liwen Bianji, Edanz Editing China (https://www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
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Jin, L., Liang, J., Fan, Q. et al. Male Great Tits (Parus major) adjust dear enemy effect expression in different breeding stages. J Ornithol 162, 221–229 (2021). https://doi.org/10.1007/s10336-020-01815-3
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DOI: https://doi.org/10.1007/s10336-020-01815-3