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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: De Mársico, María Cecilia, Mahler, Bettina, Chomnalez, Manuela, Reboreda, Juan Carlos
Publicado: 2010
Materias:
Brood parasitism
Cowbirds
Host imprinting
Host use
Molothrus
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00653454_v42_nC_p83_DeMarsico
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 paper:paper_00653454_v42_nC_p83_DeMarsico
record_format dspace
spelling paper:paper_00653454_v42_nC_p83_DeMarsico2023-06-08T15:06:06Z Host use by generalist and specialist brood-parasitic cowbirds at population and individual levels De Mársico, María Cecilia Mahler, Bettina Chomnalez, Manuela Reboreda, Juan Carlos 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. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00653454_v42_nC_p83_DeMarsico 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, María Cecilia
Mahler, Bettina
Chomnalez, Manuela
Reboreda, Juan Carlos
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.
author De Mársico, María Cecilia
Mahler, Bettina
Chomnalez, Manuela
Reboreda, Juan Carlos
author_facet De Mársico, María Cecilia
Mahler, Bettina
Chomnalez, Manuela
Reboreda, Juan Carlos
author_sort De Mársico, María Cecilia
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
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00653454_v42_nC_p83_DeMarsico
http://hdl.handle.net/20.500.12110/paper_00653454_v42_nC_p83_DeMarsico
work_keys_str_mv AT demarsicomariacecilia hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels
AT mahlerbettina hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels
AT chomnalezmanuela hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels
AT reboredajuancarlos hostusebygeneralistandspecialistbroodparasiticcowbirdsatpopulationandindividuallevels
_version_ 1768543985978048512

Ejemplares similares