Título

Sexual dimorphism in histological characteristics and contractility of the iliofibularis muscle in the lizard Sceloporus torquatus

Autor

ERENDIRA QUINTANA SANCHEZ

FRANCISCO JAVIER MANJARREZ SILVA

MARGARITA MARTINEZ GOMEZ

Liliana D'Alba

Jorge Rodríguez-Antolín

VICTOR MANUEL FAJARDO GUADARRAMA

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/licenses/by-nc-nd/4.0

Materias

Striated muscle - ([1463-6395]) sexual dimorphism - ([1463-6395]) histology - ([1463-6395]) contractility - ([1463-6395]) Sceloporus torquatus lizard - ([1463-6395]) MEDICINA Y CIENCIAS DE LA SALUD - (CTI)

Resumen o descripción

Our results and observations support the idea that muscle characteristics are coadaptations of organisms and environment, as noted by Bonine et al. (2001). What we need to know now is whether and how the environment affects the relationship between muscle phenotype and fitness. Therefore, studies on habitat, behavioural patterns, morphological characteristics and locomotor performance are needed to better understand the plasticity of the locomotor muscles.

The iliofibularis is a hindlimb muscle used in lizard locomotion that is composed of at least three types of fibres: fast-twitch-glycolytic (FG), fast-twitch-oxidativeglycolytic fibre (FOG) and slow-twitch-oxidative (SO). The striated skeletalmuscle is a highly plastic tissue undergoing phenotypic change in response to activity. The lizard Sceloporus torquatus has sexual differences associated with microhabitat use, which can be reflected in the physiology and anatomy of the muscle, and thus, in our study, we analysed the morphological and contractile characteristics of the iliofibularis muscle (IF) of S. torquatus males and females. We found a larger prevalence of FOG compared with FG and SO fibres in the muscle of both sexes. We also found that males show larger areas of the three types of fibres, develop greater strength but also faster fatigue than females, suggesting that strength is a key functional feature that enables males to perform faster movements (but for shorter periods), associated with the demands of territoriality.

CONACYT 226935/212661

Editor

Acta Zoologica

Fecha de publicación

1 de julio de 2014

Tipo de publicación

Artículo

Recurso de información

http://hdl.handle.net/20.500.11799/66012

Fuente

1463-6395

Idioma

Inglés

Relación

95;3

Audiencia

Estudiantes

Investigadores

Repositorio Orígen

REPOSITORIO INSTITUCIONAL DE LA UAEM

Descargas

318