GRADUATE RESEARCH ASSISTANTSHIP 

Role of soil organisms on ecosystem processes along an elevational / 
climatic gradient in Puerto Rico. 

USDA Forest Service International Institute of Tropical Forestry (IITF) 
and the University of Puerto Rico - Río Piedras Department of Biology 

Closing date: Open until filled. 

Position available: We seek highly motivated candidates for a MS or PhD 
graduate student assistantship. The successful applicant will have strong 
interests in the fields of tropical ecology, soil biology, experimental 
ecology and ecosystem process studies. 

Background: This research is part of an integrated research program of the 
Luquillo Long Term Ecological Research Program (LUQ LTER; 
http://luq.lternet.edu/) that seeks to understand how changes in 
temperature, rainfall, light and wind (climate) along the Luquillo 
elevation gradient explain variation in biogeochemical processes and 
biotic structure 
(http://luq.lternet.edu/publications/prop2006/LuquilloLTER4Proposal.pdf).  

There are distinct trends in several ecosystem attributes along the 
elevation
gradient in the Luquillo Mountains.  The student will develop a study that 
seeks to understand the role of soil organisms on wood and litter decay 
processes along an elevational / climatic gradient (encompassing different 
forest types) in Puerto Rico.  The goal of the study would be to determine 
how changes in rates of litter and wood decay can be explained by mean 
annual temperature, rainfall, and / or the presence/absence of particular 
functional groups of soil organisms.

The student will work under Dr. Grizelle González (USDA Forest Service) 
and in cooperation with several collaborators in the NSF -funded project. 
The student will join the IITF Soil Biology Laboratory in Río Piedras, 
Puerto Rico.  Degrees will be granted by the University of Puerto Rico, 
Río Piedras Campus, Dept. of Biology 
(http://biology.uprrp.edu/graduate_program/index.html).

Applicants should have: 
- An academic background in a field of earth, environmental, or ecological 
science; 
- Experience in more than one of the followings: fieldwork, geochemical 
laboratory analyses, decomposition experiments, identification of soil / 
litter microarthropods, earthworm research, scientific presentations and 
writing;  
- Motivation to work independently.
Stipend and tuition waiver are available as early as January 2009.  We 
seek a student who could start fieldwork in summer 2009, with 
possibilities to start coursework by August 2009. We encourage interested 
students to email as soon as possible to Dr. Grizelle González 
([EMAIL PROTECTED]) for further details, submitting:
- Cover letter summarizing research interests and academic and 
professional background 
- Resume/ CV 

- Copies of transcripts (unofficial transcripts acceptable at this point) 

- GRE scores, if available 

- Names and contact information for three references (no letters needed at 
this time) 

Official applications should be made to the Office of the Dean of Graduate 
Studies and Research at UPR – Río Piedras Campus 
(http://biology.uprrp.edu/graduate_program/info_prospective_application_pro
cedure.htm).  US-citizens and residents should complete their application 
no later than January 18, 2009.  International students should complete 
their application no later than December 3, 2008. The Department of 
Biology reviews the applications in February 1 to admit students in August 
2009.

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