Difference between revisions of "Juan Carlos Villarreal"

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'''<span style="font-size: large">Doctoral Student</span><br>
 
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Revision as of 16:57, 13 October 2008

Doctoral Student

Photo27.jpg
Near Volcán Turrialba, memorable landscape


Office: BioPharm 312
Voice: (860) 486-6306
Fax: (860) 486-6364
E-mail: juan.villarreal@uconn.edu, jcarlos.villarreal@gmail.com

Home page: http://hydrodictyon.eeb.uconn.edu/people/goffinet/index.html

Mailing address:
75 N. Eagleville Road, U-3043
Storrs, CT 06269
DISSERTATION RESEARCH

I am interested in the diversification and biogeographical distribution patterns of hornworts especially the Nothoceros alliance (including the Megaceros from the American Continent). My dissertation research is focusing on the major evolutionary events leading to the lack of sexual reproduction in the Southern Appalachian (SA) endemic and asexual hornwort Megaceros aenigmaticus . The species is the only member of the genus in North America and there are no reported observations of sporophyte production. In the SA region male and female plants live ~ 30 miles apart and male plants produce depauperate antheridia (for unknown reasons sperm cells are unable to develop functional flagella).

The first aspect of my research is unraveling the phylogenetic origin of M. aenigmaticus and its closest Neotropical relative using a multi-locus approach.

I am also testing for any cryptic sexual recombination using microsatellites and exploring the genetic consequences of the lack of sex in the population dynamics of the SA populations. In addition I will be comparing patterns of genotypic diversity between SA populations and putative conspecific and sexually reproducing populations from tropical alpine regions. Given the potential extinction threat due to the Muller's ratchet effect (accumulation of deleterious mutations), this study will have conservation and evolutionary implications (more details soon).

Páramo near Cerro Chirripó, Costa Rica. Enigmatic hornworts have been found in this area. Photo courtesy of Dr. N. Wickett


CURRENT INTERESTS

Systematics, anatomy, ultrastructure, molecular evolution and biogeography of hornworts (Anthocerotophyta), especially Neotropical taxa. Population genetics and genetic implications of the loss of sex in bryophytes.

Other interests are the evolution of carbon concentration mechanisms in the hornwort chloroplast, especially the ultrastructural and physiological implications of the presence of an algal-like pyrenoid. Symbiotic interactions between hornworts/cyanobacteria and cyanobiont specificity.


EDUCATION

University of Connecticut, Ecology and Evolutionary Biology, USA. Spring 2006- Doctorate degree

Southern Illinois University, Department of Plant Biology, Carbondale, USA. Fall 2003- Dec. 2005

Master’s degree: Ultrastructure and evolution of hornworts with emphasis on symbiotic interactions with cyanobacteria and character evolution.

Universidad de Costa Rica & Organization for Tropical Studies (OTS), Costa Rica. Jan.-Feb. 2003 Graduate course in Tropical Ecology and Conservation

University of Panamá, Bachelor’s degree in Plant Biology with Major in Bryology. 1995-2003.

Humboldt Field Research Institute & University of Maine, USA. June 2001 Field undergraduate course on biosystematics of temperate bryophytes


PUBLICATIONS

Renzaglia, K.S., J.C. Villarreal & R.J. Duff. In press (available from November 2008). New insights into morphology, anatomy and systematics of hornworts. In Bryophyte Biology II, B. Goffinet & J. Shaw (eds). (Book chapter) (http://www.cambridge.org/uk/catalogue/catalogue.asp?isbn=9780521693226)

Villarreal, J.C., G. Hässel de Menéndez & N. Salazar Allen. 2007 Nothoceros superbus (Dendrocerotaceae), a new species of hornwort from the Neotropics. The Bryologist 110: 279-285.

Duff, R.J., J.C. Villarreal, D.C. Cargill & K.S. Renzaglia. 2007. Progress and challenges toward developing a phylogeny and classification of the hornworts. The Bryologist, 110: 214-243.

Villarreal, J.C. & K.S. Renzaglia. 2006. Structure and development of Nostoc strands in Leiosporoceros dussii (Anthocerotophyta): a novel symbiosis in land plants. American Journal of Botany 93(5): 693-705. (Link to Cover http://botany.org/plantimages/ImageData.asp?IDN=abot93-5)

Villarreal, J.C. & K.S. Renzaglia. 2006. Sporophyte structure in the neotropical hornwort Phaeomegaceros fimbriatus: implications for phylogeny, taxonomy and character evolution. International Journal of Plant Sciences 167: 413-427.

Dauphin, G.; T. Pócs; J. C. Villarreal & N. Salazar Allen. 2006. Nuevos Registros de Hepáticas y Anthocerotófitas para Panamá. Tropical Bryology 27: 73-85.

Cargill, D.C.; R.J. Duff, J.C. Villarreal & K.S. Renzaglia. 2005. Generic concepts in hornworts: historical review, contemporary insights and future directions. Australian Systematic Botany 18: 7-16.

Duff, R.J.; D.C. Cargill, J.C. Villarreal & K.S. Renzaglia. 2004. Phylogenetic relationships of the hornworts based on rbcL sequence data: novel relationships and new insights. Monographs in Systematic Botany from the Missouri Botanical Garden 98: 41-58. (Book chapter)


AWARDS (for a full CV, go to http://hydrodictyon.eeb.uconn.edu/people/goffinet/People.html)

Sullivant Award from the American Bryological and Lichenological Society for the best paper published in the Bryologist during the year 2007 for the paper " Progress and challenges toward developing a phylogeny and classification of the hornworts" . The Bryologist, 110: 214-243 by Duff, R.J., J.C. Villarreal, D.C. Cargill & K.S. Renzaglia.


FIELD EXPERIENCE

Panama, Costa Rica, Venezuela (Merida), Dominican Republic, Southern Appalachians.

REVIEWER FOR

Journal of Experimental Botany; The Bryologist; Cryptogamie, Bryologie-Lichénologie, Fieldiana.

Editorial board of Acta Biologica Panamensis