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, M.C., Reboreda, J.C.
Formato: JOUR
Materias:
Agelaioides badius
Bay-winged Cowbird
Brood parasitism
MARK
Molothrus rufoaxillaris
Nest survival
Screaming Cowbird
Molothrus
Molothrus bonariensis
Acceso en línea: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 todo:paper_00105422_v112_n2_p407_DeMarsico
record_format dspace
spelling todo:paper_00105422_v112_n2_p407_DeMarsico2023-10-03T14:09:21Z Brood parasitism increases mortality of Bay-winged cowbird nests De Mársico, M.C. Reboreda, J.C. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, M.C.
Reboreda, J.C.
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.
format JOUR
author De Mársico, M.C.
Reboreda, J.C.
author_facet De Mársico, M.C.
Reboreda, J.C.
author_sort De Mársico, M.C.
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
url http://hdl.handle.net/20.500.12110/paper_00105422_v112_n2_p407_DeMarsico
work_keys_str_mv AT demarsicomc broodparasitismincreasesmortalityofbaywingedcowbirdnests
AT reboredajc broodparasitismincreasesmortalityofbaywingedcowbirdnests
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