Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds
We studied the laying behaviour of shiny cowbirds, Molothrus bonariensis, parasitizing brown-and-yellow marshbirds, Pseudoleistes virescens. Shiny cowbirds lay two egg morphs, spotted and white immaculate. Brown-and-yellow marshbirds eject the white egg morph but accept the spotted morph. The incide...
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todo:paper_00033472_v58_n4_p873_Mermoz2023-10-03T13:56:10Z Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds Mermoz, M.E. Reboreda, J.C. egg production parasite passerine Molothrus bonariensis Passeriformes Pseudoleistes virescens Pseudoleistes virescens We studied the laying behaviour of shiny cowbirds, Molothrus bonariensis, parasitizing brown-and-yellow marshbirds, Pseudoleistes virescens. Shiny cowbirds lay two egg morphs, spotted and white immaculate. Brown-and-yellow marshbirds eject the white egg morph but accept the spotted morph. The incidence of parasitism in this host was 66.5%, and half of the paratisized nests had more than one shiny cowbird egg. There was a positive relationship between the number of parasitic events and the availability of nests in the laying stage, but parasitic events reached a plateau when the availability of nests was high. The distribution of parasitic eggs per nest was more clumped than expected by chance. Shiny cowbird females synchronized parasitism with host laying in 80% of the cases. They seldom parasitized nests before the host started laying or after the nest had been deserted or predated. The majority of multiply parasitized nests were parasitized by more than one female. Females that lay white eggs did not avoid parasitizing brown-and-yellow marshbird nests. Egg pecking by cowbird females resulted, on average, in one egg lost per parasitic event and the probability of being broken was greater for host eggs when host and parasitic eggs where both in the nest. Fil:Mermoz, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Reboreda, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00033472_v58_n4_p873_Mermoz |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
egg production parasite passerine Molothrus bonariensis Passeriformes Pseudoleistes virescens Pseudoleistes virescens |
spellingShingle |
egg production parasite passerine Molothrus bonariensis Passeriformes Pseudoleistes virescens Pseudoleistes virescens Mermoz, M.E. Reboreda, J.C. Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds |
topic_facet |
egg production parasite passerine Molothrus bonariensis Passeriformes Pseudoleistes virescens Pseudoleistes virescens |
description |
We studied the laying behaviour of shiny cowbirds, Molothrus bonariensis, parasitizing brown-and-yellow marshbirds, Pseudoleistes virescens. Shiny cowbirds lay two egg morphs, spotted and white immaculate. Brown-and-yellow marshbirds eject the white egg morph but accept the spotted morph. The incidence of parasitism in this host was 66.5%, and half of the paratisized nests had more than one shiny cowbird egg. There was a positive relationship between the number of parasitic events and the availability of nests in the laying stage, but parasitic events reached a plateau when the availability of nests was high. The distribution of parasitic eggs per nest was more clumped than expected by chance. Shiny cowbird females synchronized parasitism with host laying in 80% of the cases. They seldom parasitized nests before the host started laying or after the nest had been deserted or predated. The majority of multiply parasitized nests were parasitized by more than one female. Females that lay white eggs did not avoid parasitizing brown-and-yellow marshbird nests. Egg pecking by cowbird females resulted, on average, in one egg lost per parasitic event and the probability of being broken was greater for host eggs when host and parasitic eggs where both in the nest. |
format |
JOUR |
author |
Mermoz, M.E. Reboreda, J.C. |
author_facet |
Mermoz, M.E. Reboreda, J.C. |
author_sort |
Mermoz, M.E. |
title |
Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds |
title_short |
Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds |
title_full |
Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds |
title_fullStr |
Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds |
title_full_unstemmed |
Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds |
title_sort |
egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds |
url |
http://hdl.handle.net/20.500.12110/paper_00033472_v58_n4_p873_Mermoz |
work_keys_str_mv |
AT mermozme egglayingbehaviourbyshinycowbirdsparasitizingbrownandyellowmarshbirds AT reboredajc egglayingbehaviourbyshinycowbirdsparasitizingbrownandyellowmarshbirds |
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1782029420445302784 |