Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition?
The screaming cowbird Molothrus rufoaxillaris has been long known as a host specialist brood parasite. However, in the past years, the utilization of two new hosts has been documented. We examined the variation in mitochondrial control region sequences from screaming cowbird chicks found in the nest...
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todo:paper_03405443_v63_n11_p1603_Mahler2023-10-03T15:25:41Z Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition? Mahler, B. Adamson, Y.S. Giacomo, A.G.D. Confalonieri, V.A. Reboreda, J.C. Brood parasitism Host selection Host specificity Molothrus rufoaxillaris mtDNA Screaming cowbird brood parasitism host selection host specificity host use host-parasite interaction mitochondrial DNA passerine Gnorimopsar chopi Molothrus rufoaxillaris Turdus merula The screaming cowbird Molothrus rufoaxillaris has been long known as a host specialist brood parasite. However, in the past years, the utilization of two new hosts has been documented. We examined the variation in mitochondrial control region sequences from screaming cowbird chicks found in the nests of two hosts, the bay-winged cowbird (Agelaioides badius), which is its regular host, and the chopi blackbird (Gnorimopsar chopi), which is a new host, in Formosa Province, Argentina. If a group of females switched to this new host, we expected to find an association between host use and haplotype frequency distribution, indicating the presence of host-specific female lineages, whereas we expected no such association if the cowbird population incorporated this new host and females use both hosts simultaneously. Haplotype frequency distributions differed between cowbird chicks from the nests of both hosts. This indicates that nest choice by females of this brood parasite is not random and that they preferentially parasitize the nests of the same host species. © 2009 Springer-Verlag. Fil:Mahler, B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Confalonieri, V.A. 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_03405443_v63_n11_p1603_Mahler |
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 Host selection Host specificity Molothrus rufoaxillaris mtDNA Screaming cowbird brood parasitism host selection host specificity host use host-parasite interaction mitochondrial DNA passerine Gnorimopsar chopi Molothrus rufoaxillaris Turdus merula |
spellingShingle |
Brood parasitism Host selection Host specificity Molothrus rufoaxillaris mtDNA Screaming cowbird brood parasitism host selection host specificity host use host-parasite interaction mitochondrial DNA passerine Gnorimopsar chopi Molothrus rufoaxillaris Turdus merula Mahler, B. Adamson, Y.S. Giacomo, A.G.D. Confalonieri, V.A. Reboreda, J.C. Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition? |
topic_facet |
Brood parasitism Host selection Host specificity Molothrus rufoaxillaris mtDNA Screaming cowbird brood parasitism host selection host specificity host use host-parasite interaction mitochondrial DNA passerine Gnorimopsar chopi Molothrus rufoaxillaris Turdus merula |
description |
The screaming cowbird Molothrus rufoaxillaris has been long known as a host specialist brood parasite. However, in the past years, the utilization of two new hosts has been documented. We examined the variation in mitochondrial control region sequences from screaming cowbird chicks found in the nests of two hosts, the bay-winged cowbird (Agelaioides badius), which is its regular host, and the chopi blackbird (Gnorimopsar chopi), which is a new host, in Formosa Province, Argentina. If a group of females switched to this new host, we expected to find an association between host use and haplotype frequency distribution, indicating the presence of host-specific female lineages, whereas we expected no such association if the cowbird population incorporated this new host and females use both hosts simultaneously. Haplotype frequency distributions differed between cowbird chicks from the nests of both hosts. This indicates that nest choice by females of this brood parasite is not random and that they preferentially parasitize the nests of the same host species. © 2009 Springer-Verlag. |
format |
JOUR |
author |
Mahler, B. Adamson, Y.S. Giacomo, A.G.D. Confalonieri, V.A. Reboreda, J.C. |
author_facet |
Mahler, B. Adamson, Y.S. Giacomo, A.G.D. Confalonieri, V.A. Reboreda, J.C. |
author_sort |
Mahler, B. |
title |
Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition? |
title_short |
Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition? |
title_full |
Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition? |
title_fullStr |
Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition? |
title_full_unstemmed |
Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: Host switch or host acquisition? |
title_sort |
utilization of a new host in the screaming cowbird molothrus rufoaxillaris, a host specialist brood parasite: host switch or host acquisition? |
url |
http://hdl.handle.net/20.500.12110/paper_03405443_v63_n11_p1603_Mahler |
work_keys_str_mv |
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