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UV reflectance as a cue in egg discrimination in two Prinia species exploited differently by brood parasites in Taiwan
Author(s) -
Yang Canchao,
Wang Longwu,
Hsu YuCheng,
Antonov Anton,
Moksnes Arne,
Røskaft Eivin,
Liang Wei,
Stokke Bård G.
Publication year - 2013
Publication title -
ibis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.933
H-Index - 80
eISSN - 1474-919X
pISSN - 0019-1019
DOI - 10.1111/ibi.12043
Subject(s) - brood parasite , biology , reflectivity , cuckoo , zoology , eggshell , brood , host (biology) , ecology , parasitism , physics , optics
Birds are capable of seeing the ultraviolet light ( UV ) spectrum and as a consequence have evolved UV ‐reflective structures with signalling functions. Avian eggs also reflect in the UV spectrum but the importance of UV egg matching in egg rejection decisions has been equivocal. Here we conducted egg rejection experiments in the congeneric and sympatrically breeding Y ellow‐bellied P rinia P rinia flaviventris and P lain P rinia P rinia inornata in Taiwan to assess the role of UV as a cue in egg discrimination. Yellow‐bellied P rinia is a host of O riental C uckoo C uculus optatus , whereas P lain P rinia is not. We coated one prinia egg in the experimental clutches with a cream containing a UV ‐blocking agent, while the rest of the eggs were coated with cream only. We also experimentally parasitized prinias with non‐mimetic model eggs with reduced UV reflectance. Yellow‐bellied P rinia and P lain P rinia rejected their own UV ‐blocked eggs in 18.2 and 8.3% of the experiments, respectively, and the difference was not significant. However, Y ellow‐bellied P rinia rejected 100% of the non‐mimetic eggs, whereas the P lain P rinia rejected only 5%. Hence, UV reflectance alone is a cue in egg discrimination, but the importance of reflectance outside the UV spectrum in these two prinia species is much more responsive to selection as a consequence of brood parasitism.