Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success

Avian brood parasites, including cuckoos and cowbirds, have multiple negative effects on their hosts. We analysed the effects of Shiny Cowbird Molothrus bonariensis parasitism on different components (e.g. egg losses, hatching success, chick survival and nest abandonment) of House Wren Troglodytes a...

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Autores principales: Tuero, D.T., Fiorini, V.D., Reboreda, J.C.
Formato: JOUR
Materias:
brood parasitism
clutch size
ecological impact
hatching
host-parasite interaction
incubation
juvenile
passerine
reproductive success
survival
Aves
Cuculidae
Molothrus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
Troglodytinae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00191019_v149_n3_p521_Tuero
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00191019_v149_n3_p521_Tuero
record_format dspace
spelling todo:paper_00191019_v149_n3_p521_Tuero2023-10-03T14:16:25Z Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success Tuero, D.T. Fiorini, V.D. Reboreda, J.C. brood parasitism clutch size ecological impact hatching host-parasite interaction incubation juvenile passerine reproductive success survival Aves Cuculidae Molothrus Molothrus bonariensis Troglodytes Troglodytes aedon Troglodytinae Avian brood parasites, including cuckoos and cowbirds, have multiple negative effects on their hosts. We analysed the effects of Shiny Cowbird Molothrus bonariensis parasitism on different components (e.g. egg losses, hatching success, chick survival and nest abandonment) of House Wren Troglodytes aedon reproductive success. We also conducted an experiment to discriminate between two mechanisms that may reduce hatching success in parasitized clutches: lower efficiency of incubation due to the increase in clutch volume and disruption of host incubation by the early hatching of Cowbirds. Egg puncturing by Shiny Cowbirds reduced host clutch size at hatching by 10-20%, and parasitized nests had a decrease in hatching success of 40-80%. Egg losses and hatching failures were positively associated with the intensity of parasitism. Brood reduction was greater in parasitized nests, but the growth rate of the chicks that fledged was similar to that in unparasitized nests. The combined effects of egg losses, hatching failures and brood reduction decreased the number of fledged chicks by 80%. In addition, egg puncturing increased the likelihood of nest abandonment by Wrens. Experimental data showed that hatching failures occurred when there was a combination of: (1) an increase in the volume of the clutch by the addition of the Cowbird egg without removal of host eggs, and (2) the addition of the Cowbird egg before the onset of incubation. This was relatively common in House Wren nests, as Cowbirds generally parasitize before the onset of incubation. Our results indicate that Shiny Cowbird parasitism imposes a major impact on House Wrens, as it affects all components of the Wren's reproductive success. © 2007 The Authors. Fil:Tuero, D.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fiorini, V.D. 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_00191019_v149_n3_p521_Tuero
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
clutch size
ecological impact
hatching
host-parasite interaction
incubation
juvenile
passerine
reproductive success
survival
Aves
Cuculidae
Molothrus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
Troglodytinae
spellingShingle brood parasitism
clutch size
ecological impact
hatching
host-parasite interaction
incubation
juvenile
passerine
reproductive success
survival
Aves
Cuculidae
Molothrus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
Troglodytinae
Tuero, D.T.
Fiorini, V.D.
Reboreda, J.C.
Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success
topic_facet brood parasitism
clutch size
ecological impact
hatching
host-parasite interaction
incubation
juvenile
passerine
reproductive success
survival
Aves
Cuculidae
Molothrus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
Troglodytinae
description Avian brood parasites, including cuckoos and cowbirds, have multiple negative effects on their hosts. We analysed the effects of Shiny Cowbird Molothrus bonariensis parasitism on different components (e.g. egg losses, hatching success, chick survival and nest abandonment) of House Wren Troglodytes aedon reproductive success. We also conducted an experiment to discriminate between two mechanisms that may reduce hatching success in parasitized clutches: lower efficiency of incubation due to the increase in clutch volume and disruption of host incubation by the early hatching of Cowbirds. Egg puncturing by Shiny Cowbirds reduced host clutch size at hatching by 10-20%, and parasitized nests had a decrease in hatching success of 40-80%. Egg losses and hatching failures were positively associated with the intensity of parasitism. Brood reduction was greater in parasitized nests, but the growth rate of the chicks that fledged was similar to that in unparasitized nests. The combined effects of egg losses, hatching failures and brood reduction decreased the number of fledged chicks by 80%. In addition, egg puncturing increased the likelihood of nest abandonment by Wrens. Experimental data showed that hatching failures occurred when there was a combination of: (1) an increase in the volume of the clutch by the addition of the Cowbird egg without removal of host eggs, and (2) the addition of the Cowbird egg before the onset of incubation. This was relatively common in House Wren nests, as Cowbirds generally parasitize before the onset of incubation. Our results indicate that Shiny Cowbird parasitism imposes a major impact on House Wrens, as it affects all components of the Wren's reproductive success. © 2007 The Authors.
format JOUR
author Tuero, D.T.
Fiorini, V.D.
Reboreda, J.C.
author_facet Tuero, D.T.
Fiorini, V.D.
Reboreda, J.C.
author_sort Tuero, D.T.
title Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success
title_short Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success
title_full Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success
title_fullStr Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success
title_full_unstemmed Effects of Shiny Cowbird Molothrus bonariensis parasitism on different components of House Wren Troglodytes aedon reproductive success
title_sort effects of shiny cowbird molothrus bonariensis parasitism on different components of house wren troglodytes aedon reproductive success
url http://hdl.handle.net/20.500.12110/paper_00191019_v149_n3_p521_Tuero
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