Size and sexual dimorphism in the most primitive birds, the palaeognaths

Autores
Bertelli, Sara Beatriz; Giannini, Norberto Pedro; Tubaro, Pablo Luis; Cunha Almeida, Francisca
Año de publicación
2025
Idioma
español castellano
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Palaeognathae is the most divergent clade of extant birds (Neornithes). It includes several Gondwanan taxa, namely the tinamous, kiwis, emus, ostriches, cassowaries, and rheas, as well as recently extinct taxa such as the moas and elephant birds. Except for the tinamus, all other species are cursorial ratites that have lost the ability to fly. The group also include fossil genera such as Lithornis, Paleotis, and Diogenornis from the early Eocene (~55 million years ago). In this clade, body size ranges from extremely large birds – such as the extinct elephant birds Aepyornis maximus, with an estimated weight of 409 kg, and Vorombe titan, at 800 kg – to the dwarf tinamou Taoniscus nanus, weighing just 45 g. In this study, we reconstructed the evolution of body size in paleognath birds, with a focus on the diverse Tinamidae, using carefully curated body size data from extant and fossil taxa. To test previous hypotheses, and evaluate macroevolutionary patterns we applied comparative phylogenetic methods to estimate ancestral body sizes under different models of phenotypic evolution, and evaluated the evolution of female-biased sexual dimorphism of tinamous which is very variable in the group. Our results suggest that the ancestor of all extant palaeognaths weighed about 3 kg, and that gigantism evolved independently up to five times. Significant size reductions were observed in the ancestors of both forest-dwelling (Tinaminae) and steppe tinamous (Tinamotidinae). Preliminary interpretations indicate that size changed together in male and female tinamous, maintaining dimorphism throughout evolutionary time.
Fil: Bertelli, Sara Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Giannini, Norberto Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Tubaro, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Cunha Almeida, Francisca. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina
II Congreso Latinoamericano de Evolución; VI Reunión Argentina de Biología Evolutiva y XVII Reunión Anual de la Sociedad Chilena de Evolución
San Miguel de Tucumán
Argentina
Society for Molecular Biology and Evolution
Fundación Miguel Lillo
Materia
Dimorfismo sexual
aves
tinamidae
tamaño corporal
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/281794
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/281794
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Size and sexual dimorphism in the most primitive birds, the palaeognathsTamaño y dimorfismo sexual en el grupo mas primitivo de aves, las paleognatasBertelli, Sara BeatrizGiannini, Norberto PedroTubaro, Pablo LuisCunha Almeida, FranciscaDimorfismo sexualavestinamidaetamaño corporalhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Palaeognathae is the most divergent clade of extant birds (Neornithes). It includes several Gondwanan taxa, namely the tinamous, kiwis, emus, ostriches, cassowaries, and rheas, as well as recently extinct taxa such as the moas and elephant birds. Except for the tinamus, all other species are cursorial ratites that have lost the ability to fly. The group also include fossil genera such as Lithornis, Paleotis, and Diogenornis from the early Eocene (~55 million years ago). In this clade, body size ranges from extremely large birds – such as the extinct elephant birds Aepyornis maximus, with an estimated weight of 409 kg, and Vorombe titan, at 800 kg – to the dwarf tinamou Taoniscus nanus, weighing just 45 g. In this study, we reconstructed the evolution of body size in paleognath birds, with a focus on the diverse Tinamidae, using carefully curated body size data from extant and fossil taxa. To test previous hypotheses, and evaluate macroevolutionary patterns we applied comparative phylogenetic methods to estimate ancestral body sizes under different models of phenotypic evolution, and evaluated the evolution of female-biased sexual dimorphism of tinamous which is very variable in the group. Our results suggest that the ancestor of all extant palaeognaths weighed about 3 kg, and that gigantism evolved independently up to five times. Significant size reductions were observed in the ancestors of both forest-dwelling (Tinaminae) and steppe tinamous (Tinamotidinae). Preliminary interpretations indicate that size changed together in male and female tinamous, maintaining dimorphism throughout evolutionary time.Fil: Bertelli, Sara Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaFil: Giannini, Norberto Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaFil: Tubaro, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Cunha Almeida, Francisca. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; ArgentinaII Congreso Latinoamericano de Evolución; VI Reunión Argentina de Biología Evolutiva y XVII Reunión Anual de la Sociedad Chilena de EvoluciónSan Miguel de TucumánArgentinaSociety for Molecular Biology and EvolutionFundación Miguel LilloFundacion Miguel Lillo2025info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdfhttp://hdl.handle.net/11336/281794Size and sexual dimorphism in the most primitive birds, the palaeognaths; II Congreso Latinoamericano de Evolución; VI Reunión Argentina de Biología Evolutiva y XVII Reunión Anual de la Sociedad Chilena de Evolución; San Miguel de Tucumán; Argentina; 2025; 507-5071852-6098CONICET DigitalCONICETspainfo:eu-repo/semantics/altIdentifier/url/https://www.lillo.org.ar/journals/index.php/acta-zoologica-lilloana/issue/view/182info:eu-repo/semantics/altIdentifier/doi/10.30550/j.azl/s182Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-03-31T15:21:40Zoai:ri.conicet.gov.ar:11336/281794instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-03-31 15:21:40.886CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Size and sexual dimorphism in the most primitive birds, the palaeognaths
Tamaño y dimorfismo sexual en el grupo mas primitivo de aves, las paleognatas
title Size and sexual dimorphism in the most primitive birds, the palaeognaths
spellingShingle Size and sexual dimorphism in the most primitive birds, the palaeognaths
Bertelli, Sara Beatriz
Dimorfismo sexual
aves
tinamidae
tamaño corporal
title_short Size and sexual dimorphism in the most primitive birds, the palaeognaths
title_full Size and sexual dimorphism in the most primitive birds, the palaeognaths
title_fullStr Size and sexual dimorphism in the most primitive birds, the palaeognaths
title_full_unstemmed Size and sexual dimorphism in the most primitive birds, the palaeognaths
title_sort Size and sexual dimorphism in the most primitive birds, the palaeognaths
dc.creator.none.fl_str_mv Bertelli, Sara Beatriz
Giannini, Norberto Pedro
Tubaro, Pablo Luis
Cunha Almeida, Francisca
author Bertelli, Sara Beatriz
author_facet Bertelli, Sara Beatriz
Giannini, Norberto Pedro
Tubaro, Pablo Luis
Cunha Almeida, Francisca
author_role author
author2 Giannini, Norberto Pedro
Tubaro, Pablo Luis
Cunha Almeida, Francisca
author2_role author
author
author
dc.subject.none.fl_str_mv Dimorfismo sexual
aves
tinamidae
tamaño corporal
topic Dimorfismo sexual
aves
tinamidae
tamaño corporal
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Palaeognathae is the most divergent clade of extant birds (Neornithes). It includes several Gondwanan taxa, namely the tinamous, kiwis, emus, ostriches, cassowaries, and rheas, as well as recently extinct taxa such as the moas and elephant birds. Except for the tinamus, all other species are cursorial ratites that have lost the ability to fly. The group also include fossil genera such as Lithornis, Paleotis, and Diogenornis from the early Eocene (~55 million years ago). In this clade, body size ranges from extremely large birds – such as the extinct elephant birds Aepyornis maximus, with an estimated weight of 409 kg, and Vorombe titan, at 800 kg – to the dwarf tinamou Taoniscus nanus, weighing just 45 g. In this study, we reconstructed the evolution of body size in paleognath birds, with a focus on the diverse Tinamidae, using carefully curated body size data from extant and fossil taxa. To test previous hypotheses, and evaluate macroevolutionary patterns we applied comparative phylogenetic methods to estimate ancestral body sizes under different models of phenotypic evolution, and evaluated the evolution of female-biased sexual dimorphism of tinamous which is very variable in the group. Our results suggest that the ancestor of all extant palaeognaths weighed about 3 kg, and that gigantism evolved independently up to five times. Significant size reductions were observed in the ancestors of both forest-dwelling (Tinaminae) and steppe tinamous (Tinamotidinae). Preliminary interpretations indicate that size changed together in male and female tinamous, maintaining dimorphism throughout evolutionary time.
Fil: Bertelli, Sara Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Giannini, Norberto Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Tubaro, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Cunha Almeida, Francisca. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina
II Congreso Latinoamericano de Evolución; VI Reunión Argentina de Biología Evolutiva y XVII Reunión Anual de la Sociedad Chilena de Evolución
San Miguel de Tucumán
Argentina
Society for Molecular Biology and Evolution
Fundación Miguel Lillo
description Palaeognathae is the most divergent clade of extant birds (Neornithes). It includes several Gondwanan taxa, namely the tinamous, kiwis, emus, ostriches, cassowaries, and rheas, as well as recently extinct taxa such as the moas and elephant birds. Except for the tinamus, all other species are cursorial ratites that have lost the ability to fly. The group also include fossil genera such as Lithornis, Paleotis, and Diogenornis from the early Eocene (~55 million years ago). In this clade, body size ranges from extremely large birds – such as the extinct elephant birds Aepyornis maximus, with an estimated weight of 409 kg, and Vorombe titan, at 800 kg – to the dwarf tinamou Taoniscus nanus, weighing just 45 g. In this study, we reconstructed the evolution of body size in paleognath birds, with a focus on the diverse Tinamidae, using carefully curated body size data from extant and fossil taxa. To test previous hypotheses, and evaluate macroevolutionary patterns we applied comparative phylogenetic methods to estimate ancestral body sizes under different models of phenotypic evolution, and evaluated the evolution of female-biased sexual dimorphism of tinamous which is very variable in the group. Our results suggest that the ancestor of all extant palaeognaths weighed about 3 kg, and that gigantism evolved independently up to five times. Significant size reductions were observed in the ancestors of both forest-dwelling (Tinaminae) and steppe tinamous (Tinamotidinae). Preliminary interpretations indicate that size changed together in male and female tinamous, maintaining dimorphism throughout evolutionary time.
publishDate 2025
dc.date.none.fl_str_mv 2025
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info:eu-repo/semantics/conferenceObject
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http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/281794
Size and sexual dimorphism in the most primitive birds, the palaeognaths; II Congreso Latinoamericano de Evolución; VI Reunión Argentina de Biología Evolutiva y XVII Reunión Anual de la Sociedad Chilena de Evolución; San Miguel de Tucumán; Argentina; 2025; 507-507
1852-6098
CONICET Digital
CONICET
url http://hdl.handle.net/11336/281794
identifier_str_mv Size and sexual dimorphism in the most primitive birds, the palaeognaths; II Congreso Latinoamericano de Evolución; VI Reunión Argentina de Biología Evolutiva y XVII Reunión Anual de la Sociedad Chilena de Evolución; San Miguel de Tucumán; Argentina; 2025; 507-507
1852-6098
CONICET Digital
CONICET
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language spa
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info:eu-repo/semantics/altIdentifier/doi/10.30550/j.azl/s182
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Fundacion Miguel Lillo
publisher.none.fl_str_mv Fundacion Miguel Lillo
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