Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird

Brood parasitism usually imposes several costs on individual hosts, one of which is the increased probability of brood reduction. We analyzed the effect of cowbird (Molothrus spp.) parasitism on the probability of brood reduction in the Brown-and-yellow Marshbird (Pseudoleistes virescens), a common...

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Autores principales:	Mermoz, Myriam Emilia, Fernandez, Gustavo Javier
Publicado:	2008
Materias:	Brood parasitism Brood reduction Brown-and-yellow Marshbird Molothrus Parasitism costs Pseudoleistes virescens Shiny Cowbird Molothrus bonariensis
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v110_n3_p507_Ruiz http://hdl.handle.net/20.500.12110/paper_00105422_v110_n3_p507_Ruiz
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00105422_v110_n3_p507_Ruiz
record_format	dspace
spelling	paper:paper_00105422_v110_n3_p507_Ruiz2023-06-08T14:34:34Z Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird Mermoz, Myriam Emilia Fernandez, Gustavo Javier Brood parasitism Brood reduction Brown-and-yellow Marshbird Molothrus Parasitism costs Pseudoleistes virescens Shiny Cowbird Molothrus Molothrus bonariensis Pseudoleistes virescens Brood parasitism usually imposes several costs on individual hosts, one of which is the increased probability of brood reduction. We analyzed the effect of cowbird (Molothrus spp.) parasitism on the probability of brood reduction in the Brown-and-yellow Marshbird (Pseudoleistes virescens), a common host in the Argentinean Pampas. Using a nine-year database of nesting success of the Brown-and-yellow Marshbird, we compared the number of host fledglings produced in parasitized and unparasitized nests, and assessed the effect of year, parasitism (if the nest was parasitized or not), overall brood size (including cowbird and marshbird nestlings), and "hatching interval" (interval between the first- and last-hatched young) on the probability of brood reduction. Parasitized nests produced fewer Brown-and-yellow Marshbird fledglings. About 22% of nests suffered brood reduction and 68% of these nests were parasitized by cowbirds. A logistic regression model showed that hatching interval was the main factor associated with brood reduction in this species, being associated with both the number of cowbird eggs present in the nest and overall brood size. Our results reinforce the idea that cowbird egg-laying synchronization imposes additional costs on hosts, as it increases the probability of host brood reduction. © The Cooper Ornithological Society 2008. Fil:Mermoz, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fernández, G.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v110_n3_p507_Ruiz http://hdl.handle.net/20.500.12110/paper_00105422_v110_n3_p507_Ruiz
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Brood parasitism Brood reduction Brown-and-yellow Marshbird Molothrus Parasitism costs Pseudoleistes virescens Shiny Cowbird Molothrus Molothrus bonariensis Pseudoleistes virescens
spellingShingle	Brood parasitism Brood reduction Brown-and-yellow Marshbird Molothrus Parasitism costs Pseudoleistes virescens Shiny Cowbird Molothrus Molothrus bonariensis Pseudoleistes virescens Mermoz, Myriam Emilia Fernandez, Gustavo Javier Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird
topic_facet	Brood parasitism Brood reduction Brown-and-yellow Marshbird Molothrus Parasitism costs Pseudoleistes virescens Shiny Cowbird Molothrus Molothrus bonariensis Pseudoleistes virescens
description	Brood parasitism usually imposes several costs on individual hosts, one of which is the increased probability of brood reduction. We analyzed the effect of cowbird (Molothrus spp.) parasitism on the probability of brood reduction in the Brown-and-yellow Marshbird (Pseudoleistes virescens), a common host in the Argentinean Pampas. Using a nine-year database of nesting success of the Brown-and-yellow Marshbird, we compared the number of host fledglings produced in parasitized and unparasitized nests, and assessed the effect of year, parasitism (if the nest was parasitized or not), overall brood size (including cowbird and marshbird nestlings), and "hatching interval" (interval between the first- and last-hatched young) on the probability of brood reduction. Parasitized nests produced fewer Brown-and-yellow Marshbird fledglings. About 22% of nests suffered brood reduction and 68% of these nests were parasitized by cowbirds. A logistic regression model showed that hatching interval was the main factor associated with brood reduction in this species, being associated with both the number of cowbird eggs present in the nest and overall brood size. Our results reinforce the idea that cowbird egg-laying synchronization imposes additional costs on hosts, as it increases the probability of host brood reduction. © The Cooper Ornithological Society 2008.
author	Mermoz, Myriam Emilia Fernandez, Gustavo Javier
author_facet	Mermoz, Myriam Emilia Fernandez, Gustavo Javier
author_sort	Mermoz, Myriam Emilia
title	Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird
title_short	Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird
title_full	Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird
title_fullStr	Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird
title_full_unstemmed	Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird
title_sort	effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v110_n3_p507_Ruiz http://hdl.handle.net/20.500.12110/paper_00105422_v110_n3_p507_Ruiz
work_keys_str_mv	AT mermozmyriamemilia effectofcowbirdparasitismonbroodreductioninthebrownandyellowmarshbird AT fernandezgustavojavier effectofcowbirdparasitismonbroodreductioninthebrownandyellowmarshbird
_version_	1768546050583298048

Effect of cowbird parasitism on brood reduction in the brown-and-yellow marshbird

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