Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?

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Two possible patterns of bias in primary sex ratio have been proposed for size-dimorphic brood parasites that do not evict host chicks: (1) larger males should be laid at greater frequency in hosts larger than the parasite because they compete better (increasing their survival) than females with lar...

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Autores principales: Tuero, D.T., Fiorini, V.D., Mahler, B., Reboreda, J.C.
Formato: JOUR
Materias:
Brood parasitism
Chick survival
Growth curves
Sexual differences
age
body mass
brood parasitism
fledging
growth curve
nestling
parasite
passerine
sex ratio
sexual dimorphism
survival
Mimus saturninus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00244066_v110_n2_p442_Tuero
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00244066_v110_n2_p442_Tuero
record_format dspace
spelling todo:paper_00244066_v110_n2_p442_Tuero2023-10-03T14:34:52Z Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts? Tuero, D.T. Fiorini, V.D. Mahler, B. Reboreda, J.C. Brood parasitism Chick survival Growth curves Sexual differences age body mass brood parasitism fledging growth curve nestling parasite passerine sex ratio sexual dimorphism survival Mimus saturninus Molothrus bonariensis Troglodytes Troglodytes aedon Two possible patterns of bias in primary sex ratio have been proposed for size-dimorphic brood parasites that do not evict host chicks: (1) larger males should be laid at greater frequency in hosts larger than the parasite because they compete better (increasing their survival) than females with large host nest-mates, and (2) more costly males (i.e. the larger sex) should be laid at greater frequency in hosts smaller than the parasite because, in these hosts, parasite nestlings are provisioned at a higher rate and grow faster than in larger hosts. We tested these hypotheses in two hosts of the sexually size-dimorphic shiny cowbird, Molothrus bonariensis, one smaller (house wren, Troglodytes aedon) and one larger (chalk-browed mockingbird, Mimus saturninus) than the parasite. We measured: (1) sex ratio at laying; (2) development of sexual differences in body mass during the nestling stage; and (3) chick survival and sex ratio of chicks before fledging. In both hosts, we found sexual differences in body mass of nestlings from 7 days of age onwards, although we did not find a bias in the sex ratio of eggs laid and chicks fledged. The results of the present study do not support the hypothesis that shiny cowbird females benefit from biasing the primary sex ratio depending on the size of the hosts they parasitize. © 2013 The Linnean Society of London. 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:Mahler, B. 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_00244066_v110_n2_p442_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
Chick survival
Growth curves
Sexual differences
age
body mass
brood parasitism
fledging
growth curve
nestling
parasite
passerine
sex ratio
sexual dimorphism
survival
Mimus saturninus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
spellingShingle Brood parasitism
Chick survival
Growth curves
Sexual differences
age
body mass
brood parasitism
fledging
growth curve
nestling
parasite
passerine
sex ratio
sexual dimorphism
survival
Mimus saturninus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
Tuero, D.T.
Fiorini, V.D.
Mahler, B.
Reboreda, J.C.
Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
topic_facet Brood parasitism
Chick survival
Growth curves
Sexual differences
age
body mass
brood parasitism
fledging
growth curve
nestling
parasite
passerine
sex ratio
sexual dimorphism
survival
Mimus saturninus
Molothrus bonariensis
Troglodytes
Troglodytes aedon
description Two possible patterns of bias in primary sex ratio have been proposed for size-dimorphic brood parasites that do not evict host chicks: (1) larger males should be laid at greater frequency in hosts larger than the parasite because they compete better (increasing their survival) than females with large host nest-mates, and (2) more costly males (i.e. the larger sex) should be laid at greater frequency in hosts smaller than the parasite because, in these hosts, parasite nestlings are provisioned at a higher rate and grow faster than in larger hosts. We tested these hypotheses in two hosts of the sexually size-dimorphic shiny cowbird, Molothrus bonariensis, one smaller (house wren, Troglodytes aedon) and one larger (chalk-browed mockingbird, Mimus saturninus) than the parasite. We measured: (1) sex ratio at laying; (2) development of sexual differences in body mass during the nestling stage; and (3) chick survival and sex ratio of chicks before fledging. In both hosts, we found sexual differences in body mass of nestlings from 7 days of age onwards, although we did not find a bias in the sex ratio of eggs laid and chicks fledged. The results of the present study do not support the hypothesis that shiny cowbird females benefit from biasing the primary sex ratio depending on the size of the hosts they parasitize. © 2013 The Linnean Society of London.
format JOUR
author Tuero, D.T.
Fiorini, V.D.
Mahler, B.
Reboreda, J.C.
author_facet Tuero, D.T.
Fiorini, V.D.
Mahler, B.
Reboreda, J.C.
author_sort Tuero, D.T.
title Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
title_short Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
title_full Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
title_fullStr Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
title_full_unstemmed Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
title_sort do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (molothrus bonariensis) parasitizing smaller and larger hosts?
url http://hdl.handle.net/20.500.12110/paper_00244066_v110_n2_p442_Tuero
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