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The evolution of multiple signals can be explained because they enhance the perception of a general message by recipients. Plumage coloration frequently acts as a condition‐dependent signal, so that species displaying different colour patches have the potential to transmit information on condition through a multiple signalling system. The Great Tit Parus major exhibits plumage colour patches generated...
Birds with small song repertoires have a limited number of song types which may serve multiple functions. The Grey‐cheeked Fulvetta Alcippe morrisonia is a non‐migratory species of lowland forests in Taiwan. Its song consists of two distinct phrases: a whistled phrase and a harmonic one. Each individual usually sings only one type of whistled phrase, and the geographical patterns of songs can be distinguished...
Dependent offspring influence allocation of parental investment using specialized traits thought to contain information about offspring condition. To test this hypothesis, we examined the relationship between one component of avian begging, the phenotype of the nestling mouth, and the density of a haematophagous mite, Pellonyssus reedi, in nestling House Sparrows Passer domesticus. Ectoparasite density...
Weather is known to affect the phenology and behaviour of birds, but weather‐related changes of phenotypic traits involved in communication have received little attention. Using an 8‐year dataset, we investigated links between carotenoid‐based reflectance of the freshly moulted breast of Great Tits Parus major, weather during the moulting period and food availability during the preceding breeding...
In several animal species, including birds, individuals are known to produce low‐frequency vocalizations during aggressive interactions with conspecifics. In this study, I investigated territorial interactions between male Eurasian Scops Owls Otus scops that occupied territories in a densely packed area. The single‐note hoot of the Scops Owl is generally thought to be highly repeatable; however, extensive...
Animals can evade interference from anthropogenic noise using strategies such as shifting frequencies upwards or increasing the duration of their signals. In this study, we compared the time and frequency‐related characteristics of songs and rain calls of Common Chaffinches Fringilla coelebs inhabiting rural forests and an urban park in Turkey. Most of the song phrases and rain calls did not differ...
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