The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds

Embryonic muscular activity (EMA) is involved in the development of several distinctive traits of birds. Modern avian diversity and the fossil record of the dinosaur-bird transition allow special insight into their evolution. Traits shaped by EMA result from mechanical forces acting at post-morphoge...

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Autores principales: Vargas, Alexander O., Ruiz Flores, Macarena, Soto Acuña, Sergio, Haidr, Nadia Soledad, Acosta Hospitaleche, Carolina Ileana Alicia, Ossa Fuentes, Luis Andrés, Aguayo Muñoz, José Fernando
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Naturales
Embryonic muscular activity
Aves
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/100777
https://ri.conicet.gov.ar/11336/36961
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-100777
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Embryonic muscular activity
Aves
spellingShingle Ciencias Naturales
Embryonic muscular activity
Aves
Vargas, Alexander O.
Ruiz Flores, Macarena
Soto Acuña, Sergio
Haidr, Nadia Soledad
Acosta Hospitaleche, Carolina Ileana Alicia
Ossa Fuentes, Luis Andrés
Aguayo Muñoz, José Fernando
The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds
topic_facet Ciencias Naturales
Embryonic muscular activity
Aves
description Embryonic muscular activity (EMA) is involved in the development of several distinctive traits of birds. Modern avian diversity and the fossil record of the dinosaur-bird transition allow special insight into their evolution. Traits shaped by EMA result from mechanical forces acting at post-morphogenetic stages, such that genes often play a very indirect role. Their origin seldom suggests direct selection for the trait, but a side-effect of other changes such as musculo-skeletal rearrangements, heterochrony in skeletal maturation, or increased incubation temperature (which increases EMA). EMA-shaped traits like sesamoids may be inconstant, highly conserved, or even disappear and then reappear in evolution. Some sesamoids may become increasingly influenced in evolution by genetic-molecular mechanisms (genetic assimilation). There is also ample evidence of evolutionary transitions from sesamoids to bony eminences at tendon insertion sites, and vice-versa. This can be explained by newfound similarities in the earliest development of both kinds of structures, which suggest these transitions are likely triggered by EMA. Other traits that require EMA for their formation will not necessarily undergo genetic assimilation, but still be conserved over tens and hundreds of millions of years, allowing evolutionary reduction and loss of other skeletal elements. Upon their origin, EMA-shaped traits may not be directly genetic, nor immediately adaptive. Nevertheless, EMA can play a key role in evolutionary innovation, and have consequences for the subsequent direction of evolutionary change. Its role may be more important and ubiquitous than currently suspected.
format Articulo
Articulo
author Vargas, Alexander O.
Ruiz Flores, Macarena
Soto Acuña, Sergio
Haidr, Nadia Soledad
Acosta Hospitaleche, Carolina Ileana Alicia
Ossa Fuentes, Luis Andrés
Aguayo Muñoz, José Fernando
author_facet Vargas, Alexander O.
Ruiz Flores, Macarena
Soto Acuña, Sergio
Haidr, Nadia Soledad
Acosta Hospitaleche, Carolina Ileana Alicia
Ossa Fuentes, Luis Andrés
Aguayo Muñoz, José Fernando
author_sort Vargas, Alexander O.
title The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds
title_short The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds
title_full The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds
title_fullStr The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds
title_full_unstemmed The Origin and Evolutionary Consequences of Skeletal Traits Shaped by Embryonic Muscular Activity, from Basal Theropods to Modern Birds
title_sort origin and evolutionary consequences of skeletal traits shaped by embryonic muscular activity, from basal theropods to modern birds
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/100777
https://ri.conicet.gov.ar/11336/36961
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