Creamy-Bellied Thrush Defenses Against Shiny Cowbird Brood Parasitism
نویسندگان
چکیده
منابع مشابه
Function of egg punctures by Shiny Cowbirds in parasitized and nonparasitized Creamy-bellied Thrush nests
Avian brood parasites usually remove or puncture host eggs. Several hypotheses have been proposed to explain the function of these behaviors. Removing or puncturing host eggs may enhance the efficiency of incubation of cowbird eggs (incubation-efficiency hypothesis) or reduce competition for food between cowbird and host chicks in parasitized nests (competition-reduction hypothesis) and, in non...
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Avian brood parasites reduce the reproductive success of the host, which favours the evolution of antiparasitic defences, such as aggression towards parasites or rejection of their eggs. The red-crested cardinal, Paroaria coronata, is a potential good-quality host of the shiny cowbird, Molothrus bonariensis. However, the frequency of cowbird parasitism in cardinal nests is very low and there ar...
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Shiny cowbirds, Molothrus bonariensisparasitized a high frequency (average 48%) of nests in five colonies of chestnut-capped blackbirds, Agelaius ruficapillusin Argentina. Two distinct egg morphs occurred, spotted and immaculate white eggs, as well as a few very lightly spotted intermediate eggs. The clear differences between morphs, combined with considerable variation in spotting pattern betw...
متن کاملBrood parasitism of White-rumped Swallows by Shiny Cowbirds
Swallows and martins are infrequent hosts of the generalist brood parasite Shiny Cowbird (Molothrus bonariensis). We monitored 50 nesting attempts by White-rumped Swallows (Tachycineta leucorrhoa) over a two-year period in Argentina and detected low rates of brood parasitism (three nests, or 6%). Of the three nests parasitized, cowbirds (N = 1 per nest) successfully fledged from two. Eight of 1...
متن کاملHigH RaTES Of SHiny COwbiRd PaRaSiTiSM On THE bROwn-and-yEllOw MaRSHbiRd SElECT fOR COMPlEMEnTaRy HOST dEfEnSES
Hosts of brood parasites may have not developed antiparasitic defenses either because host and parasite are recently sympatric or because costs of potential defenses outweigh their benefits. we studied antiparasitic defenses of the brown-and-yellow Marshbird (Pseudoleistes virescens) against the Shiny Cowbird (Molothrus bonariensis), evaluating recognition and aggression toward female and male ...
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ژورنال
عنوان ژورنال: The Condor
سال: 2005
ISSN: 0010-5422,1938-5129
DOI: 10.1093/condor/107.4.788