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Título

Experimental evidence that adult UV/yellow colouration functions as a signal in blue tit families — but only for parents

AutorGarcía-Campa, Jorge CSIC ORCID; Müller, Wendt; Morales, Judith
Palabras claveCommunication
Signals
Parental care
Diferential allocation
Compensation
Ultraviolet colouration
Fecha de publicación10-feb-2022
EditorSpringer Nature
CitaciónBehavioral Ecology and Sociobiology 76: 30 (2022)
ResumenIn bi-parental species, reproduction is not only a crucial life-history stage where individuals must take ftness-related decisions, but these decisions also need to be adjusted to the behavioural strategies of other individuals. Hence, communication is required, which could be facilitated by informative signals. Yet, these signalling traits might have (co-)evolved in multiple contexts, as various family members usually meet and interact during reproduction. In this study, we experimentally explored for the frst time whether a colourful plumage trait in adults acts as a signal that regulates multiple intra-family interactions in a bird species, the blue tit (Cyanistes caeruleus). We expected that an experimental reduction of adults’ UV/yellow refectance (i.e. a reduction of apparent individual quality) should afect the behavioural strategies of all family members. We found evidence for this at least in adults, since the partners of UV-blocked individuals (either males or females) increased their parental investment — perhaps to compensate for the apparent lower condition of their mates. As the UV-blocked adult did not change its provisioning behaviour, the partner presumably responded to the manipulated signal and not to a behavioural change. However, the ofspring did not co-adjust their begging intensity to the experimental treatment. It is thus possible that they responded to overall parental care rather than the signal. These results suggest that UV/yellow colouration of adult blue tits may act as quality signal revealing the rearing capacity to mates.
URIhttp://hdl.handle.net/10261/265281
DOI10.1007/s00265-022-03145-1
ISSN340-5443
E-ISSN1432-0762
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