High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing

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Brood-parasitic cowbirds (Molothrus spp.) exploit the parental care of other species (hosts) that raise their offspring. Parasitism by cowbirds reduces host reproductive success in several ways and quantifying such costs is an important step to better understand evolutionary interactions in host-par...

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Autores principales: De Mársico, M.C., Reboreda, J.C.
Formato: JOUR
Materias:
Baywing
brood parasitism
host use
Molothrus
reproductive success
body mass
fledging
host-parasite interaction
passerine
reproductive cost
specialist
survival
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01584197_v114_n4_p309_DeMarsico
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01584197_v114_n4_p309_DeMarsico
record_format dspace
spelling todo:paper_01584197_v114_n4_p309_DeMarsico2023-10-03T15:01:13Z High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing De Mársico, M.C. Reboreda, J.C. Baywing brood parasitism host use Molothrus reproductive success body mass brood parasitism fledging host use host-parasite interaction passerine reproductive cost reproductive success specialist survival Argentina Molothrus Brood-parasitic cowbirds (Molothrus spp.) exploit the parental care of other species (hosts) that raise their offspring. Parasitism by cowbirds reduces host reproductive success in several ways and quantifying such costs is an important step to better understand evolutionary interactions in host-parasite associations. We estimated the costs of parasitism by the host-specialist Screaming Cowbird (M. rufoaxillaris) to the reproductive success of its primary host, the Baywing (Agelaioides badius). We tested the effect of Cowbird parasitism on egg survival, hatching success, nestling survival and body mass at fledging of Baywings in a population of eastern Argentina where the frequency of parasitism by Screaming Cowbirds exceeds 90% of Baywing nests. Egg survival decreased with the number of Screaming Cowbird eggs laid during the egg-stage and, on average, host clutch-size was reduced by 10% per parasitic event. However, contrary to our expectations, we did not find any clear effect of parasitism on hatching success, nestling survival and body mass at fledging of Baywings. Our results suggest that, despite its high frequency, parasitism by Screaming Cowbirds has a rather little effect on the viability of Baywing offspring. We discuss how clutch rejection behaviour and flexible nest-provisioning rules of the hosts might help to explain this paradoxical result. © 2014 BirdLife Australia. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01584197_v114_n4_p309_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 Baywing
brood parasitism
host use
Molothrus
reproductive success
body mass
brood parasitism
fledging
host use
host-parasite interaction
passerine
reproductive cost
reproductive success
specialist
survival
Argentina
Molothrus
spellingShingle Baywing
brood parasitism
host use
Molothrus
reproductive success
body mass
brood parasitism
fledging
host use
host-parasite interaction
passerine
reproductive cost
reproductive success
specialist
survival
Argentina
Molothrus
De Mársico, M.C.
Reboreda, J.C.
High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing
topic_facet Baywing
brood parasitism
host use
Molothrus
reproductive success
body mass
brood parasitism
fledging
host use
host-parasite interaction
passerine
reproductive cost
reproductive success
specialist
survival
Argentina
Molothrus
description Brood-parasitic cowbirds (Molothrus spp.) exploit the parental care of other species (hosts) that raise their offspring. Parasitism by cowbirds reduces host reproductive success in several ways and quantifying such costs is an important step to better understand evolutionary interactions in host-parasite associations. We estimated the costs of parasitism by the host-specialist Screaming Cowbird (M. rufoaxillaris) to the reproductive success of its primary host, the Baywing (Agelaioides badius). We tested the effect of Cowbird parasitism on egg survival, hatching success, nestling survival and body mass at fledging of Baywings in a population of eastern Argentina where the frequency of parasitism by Screaming Cowbirds exceeds 90% of Baywing nests. Egg survival decreased with the number of Screaming Cowbird eggs laid during the egg-stage and, on average, host clutch-size was reduced by 10% per parasitic event. However, contrary to our expectations, we did not find any clear effect of parasitism on hatching success, nestling survival and body mass at fledging of Baywings. Our results suggest that, despite its high frequency, parasitism by Screaming Cowbirds has a rather little effect on the viability of Baywing offspring. We discuss how clutch rejection behaviour and flexible nest-provisioning rules of the hosts might help to explain this paradoxical result. © 2014 BirdLife Australia.
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 High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing
title_short High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing
title_full High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing
title_fullStr High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing
title_full_unstemmed High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing
title_sort high frequency but low impact of brood parasitism by the specialist screaming cowbird on its primary host, the baywing
url http://hdl.handle.net/20.500.12110/paper_01584197_v114_n4_p309_DeMarsico
work_keys_str_mv AT demarsicomc highfrequencybutlowimpactofbroodparasitismbythespecialistscreamingcowbirdonitsprimaryhostthebaywing
AT reboredajc highfrequencybutlowimpactofbroodparasitismbythespecialistscreamingcowbirdonitsprimaryhostthebaywing
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