Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success

The reproductive success of parasitic cowbirds (Molothrus spp.) varies among host species and is influenced by the degree of synchronization in timing of egg laying, the duration of parasite and host incubation periods, and the ability of hosts to incubate and rear parasite young. We studied the rep...

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Detalles Bibliográficos
Autores principales: Astié, Andrea Alejandra, Reboreda, Juan Carlos
Publicado: 2009
Materias:
Brood parasitism
Creamy-bellied Thrush
Life history
Molothrus bonariensis
Reproductive success
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Turdidae
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02738570_v80_n3_p224_Astie
http://hdl.handle.net/20.500.12110/paper_02738570_v80_n3_p224_Astie
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02738570_v80_n3_p224_Astie
record_format dspace
spelling paper:paper_02738570_v80_n3_p224_Astie2023-06-08T15:25:48Z Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success Astié, Andrea Alejandra Reboreda, Juan Carlos Brood parasitism Creamy-bellied Thrush Life history Molothrus bonariensis Reproductive success Shiny Cowbird Turdus amaurochalinus Molothrus Molothrus bonariensis Turdidae Turdus amaurochalinus The reproductive success of parasitic cowbirds (Molothrus spp.) varies among host species and is influenced by the degree of synchronization in timing of egg laying, the duration of parasite and host incubation periods, and the ability of hosts to incubate and rear parasite young. We studied the reproductive success of Shiny Cowbirds (Molothrus bonariensis) that parasitized the nests of Creamy-bellied Thrushes (Turdus amaurochalinus) in the Monte desert region of Argentina. Shiny Cowbirds frequently parasitized Creamy-bellied Thrush nests (60%), and most cowbirds synchronized egg laying with that of thrushes (79%). Most parasitic eggs (80%) hatched within 1 d of the hatching of the first host egg, and more than 91% of the eggs survived until the end of the incubation. However, only 60% of the cowbird eggs hatched and 52% of young survived. The proportion of Shiny Cowbirds eggs laid in Creamy-bellied Thrush nests that resulted in fledged young was 0.03, including eggs and young lost due to predation or desertion. Despite this low reproductive success, Creamy-bellied Thrushes were heavily parasitized by Shiny Cowbirds in our study area. Shiny Cowbirds may continue to parasitize these thrushes because of diffuse selection or because Shiny Cowbird chicks are more likely to fledge from Creamy-bellied Thrush nests in years or areas with greater food availability when brood reduction does not occur. copy;2009 Association of Field Ornithologists. Fil:Astié, 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. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02738570_v80_n3_p224_Astie http://hdl.handle.net/20.500.12110/paper_02738570_v80_n3_p224_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 Brood parasitism
Creamy-bellied Thrush
Life history
Molothrus bonariensis
Reproductive success
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Molothrus bonariensis
Turdidae
Turdus amaurochalinus
spellingShingle Brood parasitism
Creamy-bellied Thrush
Life history
Molothrus bonariensis
Reproductive success
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Molothrus bonariensis
Turdidae
Turdus amaurochalinus
Astié, Andrea Alejandra
Reboreda, Juan Carlos
Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success
topic_facet Brood parasitism
Creamy-bellied Thrush
Life history
Molothrus bonariensis
Reproductive success
Shiny Cowbird
Turdus amaurochalinus
Molothrus
Molothrus bonariensis
Turdidae
Turdus amaurochalinus
description The reproductive success of parasitic cowbirds (Molothrus spp.) varies among host species and is influenced by the degree of synchronization in timing of egg laying, the duration of parasite and host incubation periods, and the ability of hosts to incubate and rear parasite young. We studied the reproductive success of Shiny Cowbirds (Molothrus bonariensis) that parasitized the nests of Creamy-bellied Thrushes (Turdus amaurochalinus) in the Monte desert region of Argentina. Shiny Cowbirds frequently parasitized Creamy-bellied Thrush nests (60%), and most cowbirds synchronized egg laying with that of thrushes (79%). Most parasitic eggs (80%) hatched within 1 d of the hatching of the first host egg, and more than 91% of the eggs survived until the end of the incubation. However, only 60% of the cowbird eggs hatched and 52% of young survived. The proportion of Shiny Cowbirds eggs laid in Creamy-bellied Thrush nests that resulted in fledged young was 0.03, including eggs and young lost due to predation or desertion. Despite this low reproductive success, Creamy-bellied Thrushes were heavily parasitized by Shiny Cowbirds in our study area. Shiny Cowbirds may continue to parasitize these thrushes because of diffuse selection or because Shiny Cowbird chicks are more likely to fledge from Creamy-bellied Thrush nests in years or areas with greater food availability when brood reduction does not occur. copy;2009 Association of Field Ornithologists.
author Astié, Andrea Alejandra
Reboreda, Juan Carlos
author_facet Astié, Andrea Alejandra
Reboreda, Juan Carlos
author_sort Astié, Andrea Alejandra
title Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success
title_short Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success
title_full Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success
title_fullStr Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success
title_full_unstemmed Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success
title_sort shiny cowbird parasitism of a low quality host: effect of host traits on a parasite's reproductive success
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02738570_v80_n3_p224_Astie
http://hdl.handle.net/20.500.12110/paper_02738570_v80_n3_p224_Astie
work_keys_str_mv AT astieandreaalejandra shinycowbirdparasitismofalowqualityhosteffectofhosttraitsonaparasitesreproductivesuccess
AT reboredajuancarlos shinycowbirdparasitismofalowqualityhosteffectofhosttraitsonaparasitesreproductivesuccess
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