Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism

We studied Creamy-bellied Thrush (Turdus amaurochalinus) defenses against brood parasitism by Shiny Cowbirds (Molothrus bonariensis). Shiny Cowbirds decrease the reproductive success of Creamy-bellied Thrushes, and having historical habitats and ranges that overlap, we expected that thrushes possess...

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Detalles Bibliográficos
Autores principales: Astie, A.A., Reboreda, J.C.
Formato: JOUR
Materias:
Antiparasitic defenses
Brood parasitism
Creamy-bellied Thrush
Molothrus bonariensis
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Turdidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00105422_v107_n4_p788_Astie
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00105422_v107_n4_p788_Astie
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spelling todo:paper_00105422_v107_n4_p788_Astie2023-10-03T14:09:19Z Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism Astie, A.A. Reboreda, J.C. Antiparasitic defenses Brood parasitism Creamy-bellied Thrush Molothrus bonariensis Shiny Cowbird Turdus amaurochalinus Molothrus Molothrus bonariensis Turdidae Turdus amaurochalinus We studied Creamy-bellied Thrush (Turdus amaurochalinus) defenses against brood parasitism by Shiny Cowbirds (Molothrus bonariensis). Shiny Cowbirds decrease the reproductive success of Creamy-bellied Thrushes, and having historical habitats and ranges that overlap, we expected that thrushes possess antiparasitic defenses. We analyzed nest attendance during prelaying, laying and incubation; responses to the presentation of a model of a female cowbird or a control species close to the nest; nest abandonment associated with parasitism; and responses to experimental parasitism with white or spotted cowbird eggs (with or without the simultaneous presentation of a female cowbird model). Nest attendance was 58%-68% during prelaying and 83%-90% during laying and incubation. Thrushes had a shorter latency in returning near the nest and visited nests more frequently when we presented the cowbird model than the control model. The frequency of abandonment of parasitized nests was low and was not temporally associated with parasitism. Thrushes ejected white eggs more frequently than spotted eggs when parasitism was associated with the presentation of the cowbird model, but there were no differences when the model was absent. Our results indicate that Creamy-bellied Thrushes recognize cowbirds as a threat and eject white but not spotted cowbird eggs. We postulate that the low impact of cowbird parasitism on thrush hatching success and chick survival and the likelihood of recognition errors when parasite eggs resemble host eggs may have prevented the evolution of egg ejection in this host. © The Cooper Ornithological Society 2005. Fil:Astie, A.A. 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_v107_n4_p788_Astie
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antiparasitic defenses
Brood parasitism
Creamy-bellied Thrush
Molothrus bonariensis
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Molothrus bonariensis
Turdidae
Turdus amaurochalinus
spellingShingle Antiparasitic defenses
Brood parasitism
Creamy-bellied Thrush
Molothrus bonariensis
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Molothrus bonariensis
Turdidae
Turdus amaurochalinus
Astie, A.A.
Reboreda, J.C.
Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism
topic_facet Antiparasitic defenses
Brood parasitism
Creamy-bellied Thrush
Molothrus bonariensis
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Molothrus bonariensis
Turdidae
Turdus amaurochalinus
description We studied Creamy-bellied Thrush (Turdus amaurochalinus) defenses against brood parasitism by Shiny Cowbirds (Molothrus bonariensis). Shiny Cowbirds decrease the reproductive success of Creamy-bellied Thrushes, and having historical habitats and ranges that overlap, we expected that thrushes possess antiparasitic defenses. We analyzed nest attendance during prelaying, laying and incubation; responses to the presentation of a model of a female cowbird or a control species close to the nest; nest abandonment associated with parasitism; and responses to experimental parasitism with white or spotted cowbird eggs (with or without the simultaneous presentation of a female cowbird model). Nest attendance was 58%-68% during prelaying and 83%-90% during laying and incubation. Thrushes had a shorter latency in returning near the nest and visited nests more frequently when we presented the cowbird model than the control model. The frequency of abandonment of parasitized nests was low and was not temporally associated with parasitism. Thrushes ejected white eggs more frequently than spotted eggs when parasitism was associated with the presentation of the cowbird model, but there were no differences when the model was absent. Our results indicate that Creamy-bellied Thrushes recognize cowbirds as a threat and eject white but not spotted cowbird eggs. We postulate that the low impact of cowbird parasitism on thrush hatching success and chick survival and the likelihood of recognition errors when parasite eggs resemble host eggs may have prevented the evolution of egg ejection in this host. © The Cooper Ornithological Society 2005.
format JOUR
author Astie, A.A.
Reboreda, J.C.
author_facet Astie, A.A.
Reboreda, J.C.
author_sort Astie, A.A.
title Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism
title_short Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism
title_full Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism
title_fullStr Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism
title_full_unstemmed Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism
title_sort creamy-bellied thrush defenses against shiny cowbird brood parasitism
url http://hdl.handle.net/20.500.12110/paper_00105422_v107_n4_p788_Astie
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