Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites?

Mostrar todas las versiones(3)

Hamilton & Orians (1965) stated that the non-parasitic ancestor of cowbirds accelerated its incubation period and nestling growth. Later, by comparing cowbirds with nesting birds, it was suggested that those characteristics, together with small eggs with thicker eggshell, were adaptations. When...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Manuela Pujol, E., Mermoz, M.E.
Formato: Artículo publishedVersion
Publicado: 2011
Materias:
Adaptations
Allometric equation
Ancestor reconstruction
Brood parasites
Cowbirds
Egg mass
Exaptations
Incubation period
Molothrus
Nestling asymptotic body mass
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10754377_v22_n4_p553_ManuelaPujol
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_10754377_v22_n4_p553_ManuelaPujol_oai
Aporte de:
Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_10754377_v22_n4_p553_ManuelaPujol_oai
record_format dspace
spelling I28-R145-paper_10754377_v22_n4_p553_ManuelaPujol_oai2024-08-16 Manuela Pujol, E. Mermoz, M.E. 2011 Hamilton & Orians (1965) stated that the non-parasitic ancestor of cowbirds accelerated its incubation period and nestling growth. Later, by comparing cowbirds with nesting birds, it was suggested that those characteristics, together with small eggs with thicker eggshell, were adaptations. When these hypotheses were tested considering the characteristics of the group in which cowbirds evolved, i.e. the "grackles and allies", it was found that only the thicker eggshell was a plausible adaptation. Moreover, nesting grackles and allies showed the same reproductive patterns as cowbirds (shorter incubation periods, faster nestling growth, and smaller eggs than those predicted by general allometric equations). In the present study, we tested whether small eggs with short incubation periods and nestlings with accelerated growth evolved in the ancestor of grackles and allies. For all the traits tested, we reconstructed ancestral states and built prediction intervals generated with independent variables that were allometrically related to them. Except for accelerated growth, we applied two evolutionary models incorporating outgroups in three steps. We found that the short incubation period and the faster nestling growth never evolved in the ancestor of grackles and allies. In most ancestor reconstructions, neither egg mass nor female body mass changed. However, when it changed, it increased both egg and female masses. The prediction intervals indicated that those increases did not imply an allometric change in size. Consequently, neither a decrease in egg mass nor an acceleration in nestling development and incubation period are considered characteristics that predisposed cowbirds to become brood parasites. © The Neotropical Ornithological Society. Fil:Mermoz, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_10754377_v22_n4_p553_ManuelaPujol info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Ornitol. Neotrop. 2011;22(4):553-568 Adaptations Allometric equation Ancestor reconstruction Brood parasites Cowbirds Egg mass Exaptations Incubation period Molothrus Nestling asymptotic body mass Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites? info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_10754377_v22_n4_p553_ManuelaPujol_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic Adaptations
Allometric equation
Ancestor reconstruction
Brood parasites
Cowbirds
Egg mass
Exaptations
Incubation period
Molothrus
Nestling asymptotic body mass
spellingShingle Adaptations
Allometric equation
Ancestor reconstruction
Brood parasites
Cowbirds
Egg mass
Exaptations
Incubation period
Molothrus
Nestling asymptotic body mass
Manuela Pujol, E.
Mermoz, M.E.
Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites?
topic_facet Adaptations
Allometric equation
Ancestor reconstruction
Brood parasites
Cowbirds
Egg mass
Exaptations
Incubation period
Molothrus
Nestling asymptotic body mass
description Hamilton & Orians (1965) stated that the non-parasitic ancestor of cowbirds accelerated its incubation period and nestling growth. Later, by comparing cowbirds with nesting birds, it was suggested that those characteristics, together with small eggs with thicker eggshell, were adaptations. When these hypotheses were tested considering the characteristics of the group in which cowbirds evolved, i.e. the "grackles and allies", it was found that only the thicker eggshell was a plausible adaptation. Moreover, nesting grackles and allies showed the same reproductive patterns as cowbirds (shorter incubation periods, faster nestling growth, and smaller eggs than those predicted by general allometric equations). In the present study, we tested whether small eggs with short incubation periods and nestlings with accelerated growth evolved in the ancestor of grackles and allies. For all the traits tested, we reconstructed ancestral states and built prediction intervals generated with independent variables that were allometrically related to them. Except for accelerated growth, we applied two evolutionary models incorporating outgroups in three steps. We found that the short incubation period and the faster nestling growth never evolved in the ancestor of grackles and allies. In most ancestor reconstructions, neither egg mass nor female body mass changed. However, when it changed, it increased both egg and female masses. The prediction intervals indicated that those increases did not imply an allometric change in size. Consequently, neither a decrease in egg mass nor an acceleration in nestling development and incubation period are considered characteristics that predisposed cowbirds to become brood parasites. © The Neotropical Ornithological Society.
format Artículo
Artículo
publishedVersion
author Manuela Pujol, E.
Mermoz, M.E.
author_facet Manuela Pujol, E.
Mermoz, M.E.
author_sort Manuela Pujol, E.
title Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites?
title_short Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites?
title_full Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites?
title_fullStr Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites?
title_full_unstemmed Do life-history traits in the ancestor of Cowbirds (Molothrus spp.) predispose them to become brood parasites?
title_sort do life-history traits in the ancestor of cowbirds (molothrus spp.) predispose them to become brood parasites?
publishDate 2011
url http://hdl.handle.net/20.500.12110/paper_10754377_v22_n4_p553_ManuelaPujol
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_10754377_v22_n4_p553_ManuelaPujol_oai
work_keys_str_mv AT manuelapujole dolifehistorytraitsintheancestorofcowbirdsmolothrusspppredisposethemtobecomebroodparasites
AT mermozme dolifehistorytraitsintheancestorofcowbirdsmolothrusspppredisposethemtobecomebroodparasites
_version_ 1809356920821121024

Ejemplares similares