Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina

Shiny Cowbirds (Molothrus bonariensis) often parasitize larger hosts. It has been proposed that larger hosts are preferred by that parasite because they provide higher reproductive success, but available data are quite variable. We studied the reproductive success of Shiny Cowbirds in nests of Brown...

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Detalles Bibliográficos
Autores principales: Mermoz, M.E., Reboreda, J.C.
Formato: JOUR
Materias:
interspecific competition
parasitism
passerine
reproductive success
Argentina
Molothrus bonariensis
Passeriformes
Pseudoleistes virescens
Vertebrata
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00048038_v120_n4_p1128_Mermoz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00048038_v120_n4_p1128_Mermoz
record_format dspace
spelling todo:paper_00048038_v120_n4_p1128_Mermoz2023-10-03T14:03:03Z Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina Mermoz, M.E. Reboreda, J.C. interspecific competition parasitism passerine reproductive success Argentina Molothrus bonariensis Molothrus bonariensis Passeriformes Pseudoleistes virescens Pseudoleistes virescens Vertebrata Shiny Cowbirds (Molothrus bonariensis) often parasitize larger hosts. It has been proposed that larger hosts are preferred by that parasite because they provide higher reproductive success, but available data are quite variable. We studied the reproductive success of Shiny Cowbirds in nests of Brown-and-yellow Marshbirds (Pseudoleistes virescens), a larger and often multiply parasitized host. To estimate the extent of interspecific competition, we compared the hatching success of parasite eggs in nests with and without reduction of the clutch size of the host as a result of egg punctures inflicted by the parasite, and the survival and growth of parasite chicks reared with and without host chicks. To estimate the extent of intraspecific competition, we compared Shiny Cowbird egg losses, hatching success, and chick survival in singly versus multiply parasitized nests. Reproductive success of Shiny Cowbirds was 8% with depredation causing 80% of losses. Clutch reduction due to egg punctures were higher in multiply than in singly parasitized nests, but it did not improve hatching success of parasite eggs. Neither survival nor growth of parasite chicks was affected by the presence of host chicks. Shiny Cowbird hatching success and chick survival did not differ between singly and multiply parasitized nests. Parasite chicks were smaller than same-age Brown-and-yellow Marshbird chicks. However, because parasite chicks hatched one or two days before host chicks and had a higher growth rate, they were the larger chicks in the nest. Overall Shiny Cowbird reproductive success in Brown-and-yellow Marshbird nests was apparently higher than that reported in other smaller or similar-sized hosts. We think that host life-history traits like large clutch size, a longer incubation period, and slower growth rate of chicks are responsible for the high reproductive success of Shiny Cowbirds with Brown-and-yellow Marshbirds. 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_00048038_v120_n4_p1128_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 interspecific competition
parasitism
passerine
reproductive success
Argentina
Molothrus bonariensis
Molothrus bonariensis
Passeriformes
Pseudoleistes virescens
Pseudoleistes virescens
Vertebrata
spellingShingle interspecific competition
parasitism
passerine
reproductive success
Argentina
Molothrus bonariensis
Molothrus bonariensis
Passeriformes
Pseudoleistes virescens
Pseudoleistes virescens
Vertebrata
Mermoz, M.E.
Reboreda, J.C.
Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina
topic_facet interspecific competition
parasitism
passerine
reproductive success
Argentina
Molothrus bonariensis
Molothrus bonariensis
Passeriformes
Pseudoleistes virescens
Pseudoleistes virescens
Vertebrata
description Shiny Cowbirds (Molothrus bonariensis) often parasitize larger hosts. It has been proposed that larger hosts are preferred by that parasite because they provide higher reproductive success, but available data are quite variable. We studied the reproductive success of Shiny Cowbirds in nests of Brown-and-yellow Marshbirds (Pseudoleistes virescens), a larger and often multiply parasitized host. To estimate the extent of interspecific competition, we compared the hatching success of parasite eggs in nests with and without reduction of the clutch size of the host as a result of egg punctures inflicted by the parasite, and the survival and growth of parasite chicks reared with and without host chicks. To estimate the extent of intraspecific competition, we compared Shiny Cowbird egg losses, hatching success, and chick survival in singly versus multiply parasitized nests. Reproductive success of Shiny Cowbirds was 8% with depredation causing 80% of losses. Clutch reduction due to egg punctures were higher in multiply than in singly parasitized nests, but it did not improve hatching success of parasite eggs. Neither survival nor growth of parasite chicks was affected by the presence of host chicks. Shiny Cowbird hatching success and chick survival did not differ between singly and multiply parasitized nests. Parasite chicks were smaller than same-age Brown-and-yellow Marshbird chicks. However, because parasite chicks hatched one or two days before host chicks and had a higher growth rate, they were the larger chicks in the nest. Overall Shiny Cowbird reproductive success in Brown-and-yellow Marshbird nests was apparently higher than that reported in other smaller or similar-sized hosts. We think that host life-history traits like large clutch size, a longer incubation period, and slower growth rate of chicks are responsible for the high reproductive success of Shiny Cowbirds with Brown-and-yellow Marshbirds.
format JOUR
author Mermoz, M.E.
Reboreda, J.C.
author_facet Mermoz, M.E.
Reboreda, J.C.
author_sort Mermoz, M.E.
title Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina
title_short Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina
title_full Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina
title_fullStr Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina
title_full_unstemmed Reproductive success of Shiny Cowbird (Molothrus bonariensis) parasitizing the larger Brown-and-yellow Marshbird (Pseudoleistes virescens) in Argentina
title_sort reproductive success of shiny cowbird (molothrus bonariensis) parasitizing the larger brown-and-yellow marshbird (pseudoleistes virescens) in argentina
url http://hdl.handle.net/20.500.12110/paper_00048038_v120_n4_p1128_Mermoz
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AT reboredajc reproductivesuccessofshinycowbirdmolothrusbonariensisparasitizingthelargerbrownandyellowmarshbirdpseudoleistesvirescensinargentina
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