A Case of Facultative Polygyny in an Enigmatic Monogamous Species, the European Nightjar ( Caprimulgus europaeus ).

Autor: Evens R; Department of Biology, Behavioural Ecology and Ecophysiology Group University of Antwerp Antwerp Belgium.; Department of Ornithology Max Planck Institute for Biological Intelligence Eberhard-Gwinner-Straße Germany.; Earth and Life Institute, Terrestrial Ecology and Biodiversity Conservation Group Université Catholique de Louvain Louvain-la-Neuve Belgium., Lathouwers M; Centre for Environmental Sciences, Research Group Zoology, Biodiversity and Toxicology Hasselt University Diepenbeek Belgium.; Department of Geography University of Namur Namur Belgium., Creemers J; Department of Biology, Behavioural Ecology and Ecophysiology Group University of Antwerp Antwerp Belgium., Ulenaers E; Agentschap Natuur en Bos, Regio Noord-Limburg Brussels Belgium., Eens M; Department of Biology, Behavioural Ecology and Ecophysiology Group University of Antwerp Antwerp Belgium., Kempenaers B; Department of Ornithology Max Planck Institute for Biological Intelligence Eberhard-Gwinner-Straße Germany.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2024 Oct 17; Vol. 14 (10), pp. e70366. Date of Electronic Publication: 2024 Oct 17 (Print Publication: 2024).
DOI: 10.1002/ece3.70366
Abstrakt: In many socially monogamous bird species with biparental care, occasional social polygyny has been detected. We provide information about a case of facultative polygyny in the European Nightjar ( Caprimulgus europaeus ). The male nightjar (I96) formed a pair with two females (I95: the presumed primary female with whom he already bred since 2018; M042: the presumed secondary female, an inexperienced yearling). GPS and accelerometer data demonstrate how the male only sang in proximity of the primary nest, while assisting both females during incubation, as well as during the nestling period. When the male came to the nest, the primary and/or secondary female went foraging, but the secondary female received less assistance during incubation than the primary female, and her eggs were often left unattended. However, once the chicks of the secondary female hatched, male assistance suddenly increased, presumably at a cost to the primary female. Being only the second record of social polygyny in the European Nightjar, we do not have a direct explication for the occurrence of this polygynous event. We note that male density at the study site was lower than that observed in previous seasons. The male may have taken over the female that was initially paired to a neighbouring territory holder that then died. Alternatively, the inexperienced female might have mated with an already paired male, either because she was not aware of the mating status of the male, or because she could not find an unpaired male, or because mating with this paired male was better than mating with another unpaired male. In any case, the breeding ecology and mating behaviour of this crepuscular bird species remains little understood.
Competing Interests: The authors declare no conflicts of interest.
(© 2024 The Author(s). Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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