Life in the Slow Lane: The Effect of Reduced Mobility on Tadpole Limb Development

• Autores: Abdala, Virginia Sara Luz; Ponssa, María Laura
• Año de publicación: 2012
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: DEVELOPMENTAL MOBILITY REDUCTION; TADPOLES; HISTOGENESIS; VISCOSITY
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Movement is thought to be a primary agent eliciting basic responses in the vertebrate body, such as the proper development of the musculoskeletal system. Embryos do not passively await hatching or birth but rather begin active movement very early on in their development. Most studies dealing with embryonic responses to changes in mobility have been performed in chickens or mammals. Herein, we investigate for the first time whether the embryos of organisms that are free-living during development demonstrate the same morphological responses to reduced mobility as embryos that undergo development in controlled environments such as in utero or in a shelled egg. We changed the viscosity of the environment in which free-living anuran tadpoles grow by rearing them in an agar medium. We thus increased the viscosity of the growth medium resulting in a decrease in larval movement. We predicted that a substantial increase in viscosity of the medium in which the larvae were reared would have at least two consequences: (1) a reduction of tadpole mobility and (2) a delayed onset of skeletogenesis thus producing shorter long bones. Our predictions were upheld and tadpoles reared in an agar medium remain immobile longer and showed a delayed onset of keletogenesis compared with controls. We propose that the developmentalresponses to the same stimulus are similar throughout tetrapods, regardless of their developmental context (i.e., intrauterine, within an egg, or free-living).
Fil: Abdala, Virginia Sara Luz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; Argentina. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Herpetología; Argentina
Fil: Ponssa, María Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Herpetología; Argentina