cienciatk   Consejo Superior de Investigaciones Científicas
  Buscador de contenidos      Búsqueda Avanzada >>
  RSS

Bullet  ¿Qué es Cienciatk?

linea separacion

  FONDO DOCUMENTAL
Bullet  Documentos por categorías
Bullet  Documentos por colección
Bullet  Novedades


linea separacion

  ATENCIÓN AL USUARIO
Bullet  Preguntas frecuentes
Bullet  Aportación de fondos
Bullet  Contacto


linea separacion
Acceso a usuarios
QuickTime Video Land quick time
    F I C H A  D E L  D O C U M E N T O

 
 
Video watermark
Todos los vídeos están asociados a sus respectivos derechos de autor.


 
Comparte este recurso  
  Título original:    
  Research seminar: DEVELOPMENTAL PLASTICITY AND LIFE-HISTORY EVOLUTION IN AMPHIBIANS  

  Documentos relacionados
  Título:  
  Seminario de investigación: PLASTICIDAD DEL DESARROLLO Y EVOLUCIÓN DEL CICLO VITAL EN ANFIBIOS  
  Idioma:  
  Inglés  
  Duración:  
  51 min.  
  Signatura:  
  VI06106  
  Fecha de
producción: 
 
  28/03/2014  
  Nivel:  
  Estudios universitarios  
  Resumen:  
 

Environmental factors affect gene expression during development in all living organisms, producing different phenotypes in different environments. Provided there are reliable environmental cues, selection in heterogeneous environments favours plasticity as it allows organisms to adapt to rapidly changing conditions. It is critical to account for developmental plasticity in models of adaptive evolution because plasticity contributes to the maintenance of genetic variation within populations, reduces bottlenecks when facing rapid environmental changes and confers an overall faster rate of adaptation. Conversely, if plasticity costs are high and the environment stabilises, selection results in genetic assimilation, which could result in trait divergence and species diversification. Current evolutionary theory contemplates that phenotypic divergence between species may initiate as environmentally-induced expression of alternative phenotypes. Descendant lineages of a plastic ancestor evolving in stable divergent environments may lose plasticity over time, their development becoming specialised to produce fixed phenotypes matching each environment. In that case, we would expect ancestral plasticity to mirror differences among taxa and that the same mechanism allowing ancestral plasticity was also the main mechanism explaining species divergences. In that light, we are studying mechanisms of plasticity behind the evolutionary divergence of spadefoot toads.

 

Old World species (Pelobates) breed in long lasting ponds and have long but plastic larval periods, whereas New World species (Scaphiopus) have specialised in ephemeral ponds and have evolved very short larval periods. We hypothesise that  has undergone genetic accommodation of ancestral plasticity, which has resulted in canalized short larval periods. We are combining ecological, physiological, hormonal and genetic approaches to test this hypothesis.

 
  Taxonomía:  
  Reino: Animales
Filo: Cordados
Clase: Anfibios
 
  Colección:  
  Museo Nacional de Ciencias Naturales, CSIC  
  País de
producción:  
 
  España  
  Ficha técnica:  
 

Producción y edición: Mediateca MNCN-CSIC.
Ponente: Iván Gómez Mestre, Cientifico Titular, Estación Biológica de Doñana, CSIC
Presenta: Marta Barluenga, Dpto. de Biodiversidad y Biología Evolutiva, MNCN-CSIC

 
  Observaciones:  
 

Seminario organizado por el Departamento de Biodiversidad y Biología Evolutiva del Museo Nacional de Ciencias Naturales (MNCN), CSIC, y retransmitido a través de Cienciatk.

 
  Productora:  
  Museo Nacional de Ciencias Naturales (MNCN)

C/ José Gutiérrez Abascal, 2
28006 Madrid
Tlno: 91 411 13 28
Fax:  91 564 50 78
http://www.mncn.csic.es

 
 


Resolución mínima: 1024 x 768 Navegadores: Firefox 3.5.1/Internet Explorer 7.0
Todas las imágenes, vídeos y audios están protegidas por sus respectivos derechos de autor
Logos