Red-crested cardinal defences against shiny cowbird parasitism

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Avian brood parasites reduce the reproductive success of the host, which favours the evolution of antiparasitic defences, such as aggression towards parasites or rejection of their eggs. The red-crested cardinal, Paroaria coronata, is a potential good-quality host of the shiny cowbird, Molothrus bon...

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Autores principales:	Segura, Luciano Noel, Reboreda, Juan Carlos
Publicado:	2012
Materias:	antiparasitic defences brood parasitism egg rejection Molothrus bonariensis Paroaria coronata Aves Cardinalis
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00057959_v149_n3-4_p325_Segura http://hdl.handle.net/20.500.12110/paper_00057959_v149_n3-4_p325_Segura
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00057959_v149_n3-4_p325_Segura
record_format	dspace
spelling	paper:paper_00057959_v149_n3-4_p325_Segura2023-06-08T14:29:58Z Red-crested cardinal defences against shiny cowbird parasitism Segura, Luciano Noel Reboreda, Juan Carlos antiparasitic defences brood parasitism egg rejection Molothrus bonariensis Paroaria coronata Aves Cardinalis Molothrus bonariensis Paroaria coronata Avian brood parasites reduce the reproductive success of the host, which favours the evolution of antiparasitic defences, such as aggression towards parasites or rejection of their eggs. The red-crested cardinal, Paroaria coronata, is a potential good-quality host of the shiny cowbird, Molothrus bonariensis. However, the frequency of cowbird parasitism in cardinal nests is very low and there are no records of this host raising parasite's chicks, which suggest that it may have evolved effective antiparasitic defences. We studied cardinal antiparasitic defences by: (1) presenting dummy models of a female cowbird and non-predator and predator control species to nests during laying and incubation, and (2) conducting experiments of artificial parasitism with natural cowbird eggs of different morphs and conspecific eggs during laying and early and late incubation. We found that: (1) the frequency of cowbird parasitism in cardinal nests was 7%, (2) cardinals did not exhibit aggressive behaviours towards cowbird or nonpredator models but responded aggressively towards a predator model, (3) they rejected parasite eggs in 98.5% of the cases (mostly through egg ejection), but conspecific eggs in only 6% of the cases, (4) there were no costs (breakage or ejection of their own eggs) associated with ejection of the parasite's eggs, and (5) a relatively low frequency of parasitism is enough selection pressure to maintain egg rejection at a high level. The antagonistic expression of antiparasitic defences in red-crested cardinals suggests that they may have lost the behaviour of aggression towards the parasite as a result of associated costs. © 2012 Koninklijke Brill NV, Leiden. Fil:Segura, L.N. 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00057959_v149_n3-4_p325_Segura http://hdl.handle.net/20.500.12110/paper_00057959_v149_n3-4_p325_Segura
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	antiparasitic defences brood parasitism egg rejection Molothrus bonariensis Paroaria coronata Aves Cardinalis Molothrus bonariensis Paroaria coronata
spellingShingle	antiparasitic defences brood parasitism egg rejection Molothrus bonariensis Paroaria coronata Aves Cardinalis Molothrus bonariensis Paroaria coronata Segura, Luciano Noel Reboreda, Juan Carlos Red-crested cardinal defences against shiny cowbird parasitism
topic_facet	antiparasitic defences brood parasitism egg rejection Molothrus bonariensis Paroaria coronata Aves Cardinalis Molothrus bonariensis Paroaria coronata
description	Avian brood parasites reduce the reproductive success of the host, which favours the evolution of antiparasitic defences, such as aggression towards parasites or rejection of their eggs. The red-crested cardinal, Paroaria coronata, is a potential good-quality host of the shiny cowbird, Molothrus bonariensis. However, the frequency of cowbird parasitism in cardinal nests is very low and there are no records of this host raising parasite's chicks, which suggest that it may have evolved effective antiparasitic defences. We studied cardinal antiparasitic defences by: (1) presenting dummy models of a female cowbird and non-predator and predator control species to nests during laying and incubation, and (2) conducting experiments of artificial parasitism with natural cowbird eggs of different morphs and conspecific eggs during laying and early and late incubation. We found that: (1) the frequency of cowbird parasitism in cardinal nests was 7%, (2) cardinals did not exhibit aggressive behaviours towards cowbird or nonpredator models but responded aggressively towards a predator model, (3) they rejected parasite eggs in 98.5% of the cases (mostly through egg ejection), but conspecific eggs in only 6% of the cases, (4) there were no costs (breakage or ejection of their own eggs) associated with ejection of the parasite's eggs, and (5) a relatively low frequency of parasitism is enough selection pressure to maintain egg rejection at a high level. The antagonistic expression of antiparasitic defences in red-crested cardinals suggests that they may have lost the behaviour of aggression towards the parasite as a result of associated costs. © 2012 Koninklijke Brill NV, Leiden.
author	Segura, Luciano Noel Reboreda, Juan Carlos
author_facet	Segura, Luciano Noel Reboreda, Juan Carlos
author_sort	Segura, Luciano Noel
title	Red-crested cardinal defences against shiny cowbird parasitism
title_short	Red-crested cardinal defences against shiny cowbird parasitism
title_full	Red-crested cardinal defences against shiny cowbird parasitism
title_fullStr	Red-crested cardinal defences against shiny cowbird parasitism
title_full_unstemmed	Red-crested cardinal defences against shiny cowbird parasitism
title_sort	red-crested cardinal defences against shiny cowbird parasitism
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00057959_v149_n3-4_p325_Segura http://hdl.handle.net/20.500.12110/paper_00057959_v149_n3-4_p325_Segura
work_keys_str_mv	AT seguralucianonoel redcrestedcardinaldefencesagainstshinycowbirdparasitism AT reboredajuancarlos redcrestedcardinaldefencesagainstshinycowbirdparasitism
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Red-crested cardinal defences against shiny cowbird parasitism

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