Contenido más reciente ...

25 de junio de 2008

Postdoctoral position in Plant Molecular Phylogenetics

Systematics of Sedges

A postdoctoral research position is available through an NSF-funded Systematics project on the systematics and evolution of chromosome number and genome size in Carex subgenus Vignea (Cyperaceae).
This study provides an excellent opportunity to explore the evolution of genome structure in a genus with holocentric chromosomes, one that displays a remarkable range of karyotypic diversity. The postdoctoral researcher will work primarily on molecular phylogenetic and cytogenetic aspects of the project, as well as phylogenetic comparative analysis. Responsibilities include field work in North America and China, molecular systematic lab work, chromosome counting, data organization and specimen handling for the project, analysis of molecular and cytogenetic / genome size data, meeting presentations, and manuscript preparation. Candidates are required to have a PhD in plant systematics or related field, with experience in conducting field work and in cytogenetic methods or methods of molecular systematics. Experience or interest in phylogenetic comparative analysis is strongly desired. The researcher will work at The Morton Arboretum with Dr. Andrew L. Hipp (The Morton Arboretum) and Dr. Eric H. Roalson (Washington State University). Information about The Morton Arboretum is available through the Arboretum's Web site <http://www.mortonarb.org/> and our lab web site <http://redwood.mortonarb.org/lab_pages/hipp>. The position is a two-year appointment, beginning 1 January 2009 (start date negotiable). Application review begins immediately and continues until the position is filled. To apply, submit via email a curriculum vitae, statement of research interests, and contact information for three references to: Andrew Hipp, The Morton Arboretum, 4100 Illinois Route 53, Lisle IL 60532-1293; Phone: 630-725-2094; fax: 630-719-2433; e-mail <ahipp@mortonarb.org>.

21 de junio de 2008

Polarizacion de caracteres y Papel del Grupo Externo

Como se realiza la polarización de los estados de los caracteres para definir cual de estos es el ancestral y cual el derivado? En ocasiones al leer literatura basica acerca de Cladistica me parece que una de las funciones del grupo externo es esta y que el proceso se realiza automáticamente a través del software seleccionado para el procesamiento de la matriz. Sin embargo, hay otros textos que explican procesos que me parecen basados en la experiencia del investigador y su criterio acerca de cual estado es ancestral y cual derivado.
¿Cual es el verdadero papel del grupo externo? He encontrado estudios de un mismo grupo en que los grupos externos son diferentes y por lo tanto los cladogramas presentan diferente topología. Pienso que a veces los investigadores manipulan la topología del cladograma cambiando el grupo externo.

16 de junio de 2008

La nueva Taxonomia Nueva




















"Initiatives reinventing taxonomy for the Internet generation are leading to a dramatic resurgence in this once declining discipline.

Looking at the efforts of several groups to catalog the worlds biodiversity and make it accessible, this work discusses the future of descriptive taxonomy.

It covers such technology as DNA evidence and its applications, computer-assisted species identification, digital morphology, and E-typification. It also provides insight into effective ways of organizing taxonomic information, and discusses what benefits can be leveraged from a rapid growth of taxonomic knowledge."

Archivo del Blog

Notificación de contenido nuevo

Ingrese su correo electrónico:

Reciba las noticias en su correo electrónico mediante FeedBurner

Reciba las noticias de Filogenetica.org en:

Follow Filogeneticaorg on Twitter
Siguenos en Facebook

-


Seguidores

Comenta en Facebook

Lo más reciente en el blog de Morfometría Geométrica