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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Detalles Bibliográficos
Autores principales:	Mermoz, Myriam Emilia, Reboreda, Juan Carlos
Publicado:	1999
Materias:	egg production parasite passerine Molothrus bonariensis Passeriformes Pseudoleistes virescens
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00033472_v58_n4_p873_Mermoz http://hdl.handle.net/20.500.12110/paper_00033472_v58_n4_p873_Mermoz
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00033472_v58_n4_p873_Mermoz
record_format	dspace
spelling	paper:paper_00033472_v58_n4_p873_Mermoz2023-06-08T14:24:18Z Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds Mermoz, Myriam Emilia Reboreda, Juan Carlos 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. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00033472_v58_n4_p873_Mermoz 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
collection	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, Myriam Emilia Reboreda, Juan Carlos 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.
author	Mermoz, Myriam Emilia Reboreda, Juan Carlos
author_facet	Mermoz, Myriam Emilia Reboreda, Juan Carlos
author_sort	Mermoz, Myriam Emilia
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
publishDate	1999
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00033472_v58_n4_p873_Mermoz http://hdl.handle.net/20.500.12110/paper_00033472_v58_n4_p873_Mermoz
work_keys_str_mv	AT mermozmyriamemilia egglayingbehaviourbyshinycowbirdsparasitizingbrownandyellowmarshbirds AT reboredajuancarlos egglayingbehaviourbyshinycowbirdsparasitizingbrownandyellowmarshbirds
_version_	1768545857608613888

Egg-laying behaviour by shiny cowbirds parasitizing brown-and-yellow marshbirds

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