Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds

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We studied the breeding biology of the Baywing (Agelaioides badius), a shared host of Screaming (Molothrus rufoaxillaris) and Shiny (M. bonariensis) cowbirds. We monitored 193 nests from December 2002 to March 2007 in the Province of Buenos Aires, Argentina. Baywings used a wide variety of nesting s...

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Autores principales: De Mársico, M.C., Mahler, B., Reboreda, J.C.
Formato: JOUR
Materias:
breeding season
cohort analysis
growth rate
nestling
parasitism
passerine
reproductive biology
reproductive success
survival
Argentina
Buenos Aires [Argentina]
Molothrus
Molothrus bonariensis
Molothrus rufoaxillaris
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15594491_v122_n3_p417_DeMarsico
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15594491_v122_n3_p417_DeMarsico
record_format dspace
spelling todo:paper_15594491_v122_n3_p417_DeMarsico2023-10-03T16:26:16Z Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds De Mársico, M.C. Mahler, B. Reboreda, J.C. breeding season cohort analysis growth rate nestling parasitism passerine reproductive biology reproductive success survival Argentina Buenos Aires [Argentina] Molothrus Molothrus bonariensis Molothrus rufoaxillaris We studied the breeding biology of the Baywing (Agelaioides badius), a shared host of Screaming (Molothrus rufoaxillaris) and Shiny (M. bonariensis) cowbirds. We monitored 193 nests from December 2002 to March 2007 in the Province of Buenos Aires, Argentina. Baywings used a wide variety of nesting sites, mainly old nests of furnarids. Their breeding season lasted from late November to February and was closely matched by that of Screaming Cowbirds. The breeding season for Shiny Cowbirds started in late September but overlapped that of Baywings. Frequency and intensity of Screaming Cowbird parasitism were 93% and 5 eggs per parasitized nest, while for Shiny Cowbirds they were 16% and 1.4 eggs. Host clutch size was 4.0 ± 0.1 eggs and did not vary with time of breeding. Weight at hatching and age of maximum growth were similar for host and Screaming Cowbird nestlings. Shiny Cowbird nestlings had higher weight at hatching and lower age of maximum growth than the other two species. Screaming and Shiny cowbird nestlings had higher growth rates and asymptotic weights than host nestlings. Sex-specific growth curves of Screaming Cowbirds indicated males had higher growth rate and asymptotic weight than females. Only 19% of the nests produced fledglings. Host egg survival, hatching success, and nestling survival were 0.92, 0.88, and 0.94, respectively. Excluding nest failures, hosts fledged 0.78 chicks per egg laid. Baywings were smaller than Screaming and Shiny cowbirds, and experienced a high frequency and intensity of parasitism. However, the effect of parasitism on host hatching success and chick survival was low and comparable to that observed in larger hosts. © 2010 by the Wilson Ornithological Society. Fil:De Mársico, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mahler, B. 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_15594491_v122_n3_p417_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 breeding season
cohort analysis
growth rate
nestling
parasitism
passerine
reproductive biology
reproductive success
survival
Argentina
Buenos Aires [Argentina]
Molothrus
Molothrus bonariensis
Molothrus rufoaxillaris
spellingShingle breeding season
cohort analysis
growth rate
nestling
parasitism
passerine
reproductive biology
reproductive success
survival
Argentina
Buenos Aires [Argentina]
Molothrus
Molothrus bonariensis
Molothrus rufoaxillaris
De Mársico, M.C.
Mahler, B.
Reboreda, J.C.
Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds
topic_facet breeding season
cohort analysis
growth rate
nestling
parasitism
passerine
reproductive biology
reproductive success
survival
Argentina
Buenos Aires [Argentina]
Molothrus
Molothrus bonariensis
Molothrus rufoaxillaris
description We studied the breeding biology of the Baywing (Agelaioides badius), a shared host of Screaming (Molothrus rufoaxillaris) and Shiny (M. bonariensis) cowbirds. We monitored 193 nests from December 2002 to March 2007 in the Province of Buenos Aires, Argentina. Baywings used a wide variety of nesting sites, mainly old nests of furnarids. Their breeding season lasted from late November to February and was closely matched by that of Screaming Cowbirds. The breeding season for Shiny Cowbirds started in late September but overlapped that of Baywings. Frequency and intensity of Screaming Cowbird parasitism were 93% and 5 eggs per parasitized nest, while for Shiny Cowbirds they were 16% and 1.4 eggs. Host clutch size was 4.0 ± 0.1 eggs and did not vary with time of breeding. Weight at hatching and age of maximum growth were similar for host and Screaming Cowbird nestlings. Shiny Cowbird nestlings had higher weight at hatching and lower age of maximum growth than the other two species. Screaming and Shiny cowbird nestlings had higher growth rates and asymptotic weights than host nestlings. Sex-specific growth curves of Screaming Cowbirds indicated males had higher growth rate and asymptotic weight than females. Only 19% of the nests produced fledglings. Host egg survival, hatching success, and nestling survival were 0.92, 0.88, and 0.94, respectively. Excluding nest failures, hosts fledged 0.78 chicks per egg laid. Baywings were smaller than Screaming and Shiny cowbirds, and experienced a high frequency and intensity of parasitism. However, the effect of parasitism on host hatching success and chick survival was low and comparable to that observed in larger hosts. © 2010 by the Wilson Ornithological Society.
format JOUR
author De Mársico, M.C.
Mahler, B.
Reboreda, J.C.
author_facet De Mársico, M.C.
Mahler, B.
Reboreda, J.C.
author_sort De Mársico, M.C.
title Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds
title_short Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds
title_full Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds
title_fullStr Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds
title_full_unstemmed Reproductive success and nestling growth of the Baywing parasitized by screaming and shiny cowbirds
title_sort reproductive success and nestling growth of the baywing parasitized by screaming and shiny cowbirds
url http://hdl.handle.net/20.500.12110/paper_15594491_v122_n3_p417_DeMarsico
work_keys_str_mv AT demarsicomc reproductivesuccessandnestlinggrowthofthebaywingparasitizedbyscreamingandshinycowbirds
AT mahlerb reproductivesuccessandnestlinggrowthofthebaywingparasitizedbyscreamingandshinycowbirds
AT reboredajc reproductivesuccessandnestlinggrowthofthebaywingparasitizedbyscreamingandshinycowbirds
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