Brood parasitism increases mortality of Bay-winged cowbird nests

Brood-parasitic cowbirds (Molothrus spp.) can cause total nest failure directly by inducing nest desertion or by destroying the host's clutch or indirectly by facilitating nest predation. We examined the relationship between brood parasitism and nest survival in the Bay-winged Cowbird (Agelaioi...

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Autores principales:	De Mársico, María Cecilia, Reboreda, Juan Carlos
Publicado:	2010
Materias:	Agelaioides badius Bay-winged Cowbird Brood parasitism MARK Molothrus rufoaxillaris Nest survival Screaming Cowbird Molothrus Molothrus bonariensis
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v112_n2_p407_DeMarsico http://hdl.handle.net/20.500.12110/paper_00105422_v112_n2_p407_DeMarsico
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00105422_v112_n2_p407_DeMarsico
record_format	dspace
spelling	paper:paper_00105422_v112_n2_p407_DeMarsico2023-06-08T14:34:35Z Brood parasitism increases mortality of Bay-winged cowbird nests De Mársico, María Cecilia Reboreda, Juan Carlos Agelaioides badius Bay-winged Cowbird Brood parasitism MARK Molothrus rufoaxillaris Nest survival Screaming Cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris Brood-parasitic cowbirds (Molothrus spp.) can cause total nest failure directly by inducing nest desertion or by destroying the host's clutch or indirectly by facilitating nest predation. We examined the relationship between brood parasitism and nest survival in the Bay-winged Cowbird (Agelaioides badius), the primary host of the Screaming Cowbird (M. rufoaxillaris) and a secondary host of the Shiny Cowbird (M. bonariensis). We used the program MARK to model daily nest-survival rates, including hypothesized effects of intensity of parasitism, egg losses caused by cowbirds, and total clutch size. Support for each model was evaluated by an informationtheoretic approach. More than 50% of the nests failed before incubation was completed, mainly because of the ejection or desertion of parasitized clutches. The model of daily nest survival with best support included the additive effects of intensity of parasitism and number of eggs lost, which were negatively related to nest survival. The model including the effect of clutch size did not receive support. The predicted probability of a nest surviving the entire nesting cycle was 35% for unparasitized nests without egg loss, whereas under the levels of parasitism observed during this study the probability of nest survival varied between 0 and 32%. Nest predation during the egg and nestling stages was positively related to the number of cowbird eggs and chicks, respectively, suggesting that parasitism by Screaming and Shiny Cowbirds may also facilitate depredation of Bay-winged Cowbird nests. © The Cooper Ornithological Society 2010. Fil:De Mársico, M.C. 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. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v112_n2_p407_DeMarsico http://hdl.handle.net/20.500.12110/paper_00105422_v112_n2_p407_DeMarsico
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Agelaioides badius Bay-winged Cowbird Brood parasitism MARK Molothrus rufoaxillaris Nest survival Screaming Cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris
spellingShingle	Agelaioides badius Bay-winged Cowbird Brood parasitism MARK Molothrus rufoaxillaris Nest survival Screaming Cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris De Mársico, María Cecilia Reboreda, Juan Carlos Brood parasitism increases mortality of Bay-winged cowbird nests
topic_facet	Agelaioides badius Bay-winged Cowbird Brood parasitism MARK Molothrus rufoaxillaris Nest survival Screaming Cowbird Molothrus Molothrus bonariensis Molothrus rufoaxillaris
description	Brood-parasitic cowbirds (Molothrus spp.) can cause total nest failure directly by inducing nest desertion or by destroying the host's clutch or indirectly by facilitating nest predation. We examined the relationship between brood parasitism and nest survival in the Bay-winged Cowbird (Agelaioides badius), the primary host of the Screaming Cowbird (M. rufoaxillaris) and a secondary host of the Shiny Cowbird (M. bonariensis). We used the program MARK to model daily nest-survival rates, including hypothesized effects of intensity of parasitism, egg losses caused by cowbirds, and total clutch size. Support for each model was evaluated by an informationtheoretic approach. More than 50% of the nests failed before incubation was completed, mainly because of the ejection or desertion of parasitized clutches. The model of daily nest survival with best support included the additive effects of intensity of parasitism and number of eggs lost, which were negatively related to nest survival. The model including the effect of clutch size did not receive support. The predicted probability of a nest surviving the entire nesting cycle was 35% for unparasitized nests without egg loss, whereas under the levels of parasitism observed during this study the probability of nest survival varied between 0 and 32%. Nest predation during the egg and nestling stages was positively related to the number of cowbird eggs and chicks, respectively, suggesting that parasitism by Screaming and Shiny Cowbirds may also facilitate depredation of Bay-winged Cowbird nests. © The Cooper Ornithological Society 2010.
author	De Mársico, María Cecilia Reboreda, Juan Carlos
author_facet	De Mársico, María Cecilia Reboreda, Juan Carlos
author_sort	De Mársico, María Cecilia
title	Brood parasitism increases mortality of Bay-winged cowbird nests
title_short	Brood parasitism increases mortality of Bay-winged cowbird nests
title_full	Brood parasitism increases mortality of Bay-winged cowbird nests
title_fullStr	Brood parasitism increases mortality of Bay-winged cowbird nests
title_full_unstemmed	Brood parasitism increases mortality of Bay-winged cowbird nests
title_sort	brood parasitism increases mortality of bay-winged cowbird nests
publishDate	2010
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v112_n2_p407_DeMarsico http://hdl.handle.net/20.500.12110/paper_00105422_v112_n2_p407_DeMarsico
work_keys_str_mv	AT demarsicomariacecilia broodparasitismincreasesmortalityofbaywingedcowbirdnests AT reboredajuancarlos broodparasitismincreasesmortalityofbaywingedcowbirdnests
_version_	1768545628027092992

Brood parasitism increases mortality of Bay-winged cowbird nests

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