IADIZA - GIB ACTIVIDADES Difusion Octodóntidos

De Mendoza CONICET

(Diferencias entre revisiones)
(Una nueva visita a los Octodóntidos)
(Una nueva visita a los Octodóntidos)
 
(2 ediciones intermedias no se muestran.)
Línea 3: Línea 3:
==Una nueva visita a los Octodóntidos==
==Una nueva visita a los Octodóntidos==
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<div align="right">[[http://wiki.cricyt.edu.ar/index.php?title=IADIZA_-_GIB_ACTIVIDADES_Difusion  VOLVER]][[Imagen:GiB_flecha_arriba.GIF]]</div>
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The monophyletic and paucispecific assemblage of South American octodontid rodents has experienced an extensive adaptive radiation from above-ground dwellers to subterranean, saxicollous, and gerbil-like deserticolous life forms. The complex and saltational mode of chromosomal repatterning is the hallmark of octodontid evolution. Recent molecular evidence links this chromosome dynamics with quantum genome size shifts, and probably with reticulate evolution via introgressive hybridization in the desert dwellers T. barrerae and P. aureus. Genome duplication represents a novel mechanism of evolution in mammals and its adaptive role is reflected in the ability of deserticolous species to colonize the extreme environment of salt flats. Exclusive of ''[http://wiki.cricyt.edu.ar/images/d/da/Respuestas_adaptativas.pdf Tympanoctomys]'', the rigid bundle of hairs behind its upper incisors is crucial to efficiently peel saltbush leaves and probably explains its broader distribution relative to P. aureus. This feature, allows efficient peeling of the saltbush leaves which in association with other atributes (ie. specialized kidneys, large bullae, feeding behavior) enabled the red vizcacha rat to cope with extreme environmental conditions (Gallardo,M, R.A.Ojeda,C. Gonzalez y C. Rios The Octodontidae Revisited. en: Contributions to honor the career of Oliver Pearson (1915-2003) (DA. Kelt, E.Lessa, JA.Salazar-Bravo y JL. Patton, eds.). University of California Publications in Zoology en prensa).
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The monophyletic and paucispecific assemblage of South American octodontid rodents has experienced an extensive adaptive radiation from above-ground dwellers to subterranean, saxicollous, and gerbil-like deserticolous life forms. The complex and saltational mode of chromosomal repatterning is the hallmark of octodontid evolution. Recent molecular evidence links this chromosome dynamics with quantum genome size shifts, and probably with reticulate evolution via introgressive hybridization in the desert dwellers ''T. barrerae'' and ''P. aureus''. Genome duplication represents a novel mechanism of evolution in mammals and its adaptive role is reflected in the ability of deserticolous species to colonize the extreme environment of salt flats. Exclusive of ''[http://wiki.cricyt.edu.ar/images/d/da/Respuestas_adaptativas.pdf Tympanoctomys]'', the rigid bundle of hairs behind its upper incisors is crucial to efficiently peel saltbush leaves and probably explains its broader distribution relative to P. aureus. This feature, allows efficient peeling of the saltbush leaves which in association with other atributes (ie. specialized kidneys, large bullae, feeding behavior) enabled the red vizcacha rat to cope with extreme environmental conditions (Gallardo,M, R.A.Ojeda,C. Gonzalez y C. Rios. 2007. The Octodontidae Revisited. en: Contributions to honor the career of Oliver Pearson (1915-2003) (DA. Kelt, E.Lessa, JA.Salazar-Bravo y JL. Patton, eds.). University of California Publications in Zoology, Vol 134).

última version al 21:03 30 jun 2009


INICIO
GRUPO Historia Mision Objetivos Gente
ACTIVIDADES Investigacion Publicaciones Cursos Difusion
RECURSOS Estacion de campo Laboratorio Coleccion Animal Bioterio Sitios Web
NOTICIAS
INTERNATIONAL FEDERATION OF MAMMALOGISTS
CONTACTO



Una nueva visita a los Octodóntidos

[VOLVER]Imagen:GiB_flecha_arriba.GIF

The monophyletic and paucispecific assemblage of South American octodontid rodents has experienced an extensive adaptive radiation from above-ground dwellers to subterranean, saxicollous, and gerbil-like deserticolous life forms. The complex and saltational mode of chromosomal repatterning is the hallmark of octodontid evolution. Recent molecular evidence links this chromosome dynamics with quantum genome size shifts, and probably with reticulate evolution via introgressive hybridization in the desert dwellers T. barrerae and P. aureus. Genome duplication represents a novel mechanism of evolution in mammals and its adaptive role is reflected in the ability of deserticolous species to colonize the extreme environment of salt flats. Exclusive of Tympanoctomys, the rigid bundle of hairs behind its upper incisors is crucial to efficiently peel saltbush leaves and probably explains its broader distribution relative to P. aureus. This feature, allows efficient peeling of the saltbush leaves which in association with other atributes (ie. specialized kidneys, large bullae, feeding behavior) enabled the red vizcacha rat to cope with extreme environmental conditions (Gallardo,M, R.A.Ojeda,C. Gonzalez y C. Rios. 2007. The Octodontidae Revisited. en: Contributions to honor the career of Oliver Pearson (1915-2003) (DA. Kelt, E.Lessa, JA.Salazar-Bravo y JL. Patton, eds.). University of California Publications in Zoology, Vol 134).

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