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overlapping breeding attempts in the Bearded Tit(Panurus biarmicus)

Avian Research 2018年第2期9卷 163-167页

作者： Janusz Stepniewski Lucyna Halupka Mala Koscielna 9 64-113 OsiecznaPoland Ornithological Station Wroclaw UniversitySienkiewicza 2150-335 WroclawPoland

Background: overlapping of successive broods is a relatively rare breeding strategy that allows individuals to make effective use of the available reproductive ***: In this paper we analyse the occurrence of overlapping breeding attempts in the Bearded Tit(Panurus biarmicus), a non-migratory passerine species, whose peripheral populations vary enormously in ***: The colour-ringed population of Bearded Tits was studied in western Poland in 1990, 2012–2013 and 2015–2017. overlapping broods were found only during years with low population sizes and low densities(1.2–3.6 pairs per 10 ha), and pairs with such broods constituted 11.1–20%. In years with higher population densities(8.7–13.44 pairs per 10 ha) overlapping broods were not recorded. Pairs started building the next(overlapping) nests when their young were 3–10 days old. They divided their duties while rearing two broods simultaneously: females were occupied only with the new clutch, while males, in contrast to other species with brood overlap, not only fed the young from an earlier brood, but also helped the females with the building of a new nest and incubation of a new ***: Laying overlapping clutches enabled pairs to shorten their average breeding cycle by 15–21 days and produce more offspring. It is possible that overlapping breeding attempts is a density-dependant strategy, enabling the population to restore after severe declines, however, alternative explanations are also possible. Future studies are needed to better understand mechanisms underlying the occurrence of this phenomenon.

关键词： Bearded Tit Panurus biarmicus overlapping broods Breeding biology

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