Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels

We analyzed host use at population and individual levels in the host-generalist shiny cowbird (Molothrus bonariensis) and in the host-specialist screaming cowbird (M. rufoaxillaris). At the population level, shiny cowbirds were less generalists than previously assumed and host use varied considerabl...

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Detalles Bibliográficos
Autores principales:	De Mársico, M.C., Mahler, B., Chomnalez, M., Di Giácomo, A.G., Reboreda, J.C.
Formato:	SER
Materias:	Brood parasitism Cowbirds Host imprinting Host use Molothrus
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00653454_v42_nC_p83_DeMarsico
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00653454_v42_nC_p83_DeMarsico
record_format	dspace
spelling	todo:paper_00653454_v42_nC_p83_DeMarsico2023-10-03T14:53:00Z Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels De Mársico, M.C. Mahler, B. Chomnalez, M. Di Giácomo, A.G. Reboreda, J.C. Brood parasitism Cowbirds Host imprinting Host use Molothrus We analyzed host use at population and individual levels in the host-generalist shiny cowbird (Molothrus bonariensis) and in the host-specialist screaming cowbird (M. rufoaxillaris). At the population level, shiny cowbirds were less generalists than previously assumed and host use varied considerably among regions. There was, however, no clear preference for host species, since we found no associations between frequency of parasitism and host's body mass, type of nest, or genetic distance between host and parasite. Regarding screaming cowbirds, frequency and intensity of parasitism varied among host populations. Parasitic eggs and chicks were equally successful in the primary and secondary hosts, but they experienced high mortality rates when transferred to other suitable, but unused hosts. Screaming and shiny cowbirds overlapped little in host use and had no apparent effect on each other's success when reared together in a common host. At the individual level, there was an association between mtDNA haplotypes of shiny and screaming cowbird chicks and the hosts in whose nests they were found, indicating that nest choice by parasitic females is not random. We discuss how host imprinting by females can lead to the formation of host-specific races and how the occurrence of recognition errors and social learning can lead to the colonization of new hosts. © 2010 Elsevier Inc. 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:Chomnalez, M. 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. SER info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00653454_v42_nC_p83_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	Brood parasitism Cowbirds Host imprinting Host use Molothrus
spellingShingle	Brood parasitism Cowbirds Host imprinting Host use Molothrus De Mársico, M.C. Mahler, B. Chomnalez, M. Di Giácomo, A.G. Reboreda, J.C. Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels
topic_facet	Brood parasitism Cowbirds Host imprinting Host use Molothrus
description	We analyzed host use at population and individual levels in the host-generalist shiny cowbird (Molothrus bonariensis) and in the host-specialist screaming cowbird (M. rufoaxillaris). At the population level, shiny cowbirds were less generalists than previously assumed and host use varied considerably among regions. There was, however, no clear preference for host species, since we found no associations between frequency of parasitism and host's body mass, type of nest, or genetic distance between host and parasite. Regarding screaming cowbirds, frequency and intensity of parasitism varied among host populations. Parasitic eggs and chicks were equally successful in the primary and secondary hosts, but they experienced high mortality rates when transferred to other suitable, but unused hosts. Screaming and shiny cowbirds overlapped little in host use and had no apparent effect on each other's success when reared together in a common host. At the individual level, there was an association between mtDNA haplotypes of shiny and screaming cowbird chicks and the hosts in whose nests they were found, indicating that nest choice by parasitic females is not random. We discuss how host imprinting by females can lead to the formation of host-specific races and how the occurrence of recognition errors and social learning can lead to the colonization of new hosts. © 2010 Elsevier Inc.
format	SER
author	De Mársico, M.C. Mahler, B. Chomnalez, M. Di Giácomo, A.G. Reboreda, J.C.
author_facet	De Mársico, M.C. Mahler, B. Chomnalez, M. Di Giácomo, A.G. Reboreda, J.C.
author_sort	De Mársico, M.C.
title	Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels
title_short	Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels
title_full	Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels
title_fullStr	Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels
title_full_unstemmed	Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels
title_sort	host use by generalist and specialist brood-parasitic cowbirds at population and individual levels
url	http://hdl.handle.net/20.500.12110/paper_00653454_v42_nC_p83_DeMarsico
work_keys_str_mv	AT demarsicomc hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels AT mahlerb hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels AT chomnalezm hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels AT digiacomoag hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels AT reboredajc hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels
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Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels

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