Graduate Research Assistantship (GRA)/Ph.D. student position , University of Oklahoma

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October 2, 2009

Graduate Research Assistantship (GRA)/Ph.D. student position available:
A Ph.D. student position is available in my laboratory to work on a new
3-year NSF-funded project entitled, ¡§Organism-environment interactions
¡V impact of cultural eutrophication on Daphnia tracked by genomics,
physiology, and resurrection ecology¡¨.

In a planned 36-month project in collaboration with colleagues at Oklahoma
State University and Indiana University, the PIs will use an integrated
approach involving genetic/genomic, physiological, and ¡§resurrection
ecology¡¨ methods to examine how cultural eutrophication (i.e.,
enrichment of freshwater systems with nutrients such as phosphorus)
influences evolutionary changes in organisms. The waterflea, Daphnia
pulex, which plays a major role in freshwater food webs (i.e. it eats
algae/bacteria and in turn is fed upon by fish), will serve as the
model organism. Daphnia are ideal for such studies because they produce
resting eggs that can lay dormant in lake sediments for long periods of
time. Decades-old eggs can be induced to hatch (i.e. ¡§resurrection
ecology¡¨) and viable DNA can be extracted from eggs that are
centuries old. Moreover, the D. pulex genome has been sequenced and
genetic/genomic methods (i.e. gene expression) are in place to study
how changes in eutrophication (phosphorus-level) patterns over the past
century have influenced how an organism like a daphniid can respond to
ecosystem/environmental change. Results from this cross-disciplinary
study will provide an excellent example of how man-made environmental
changes (via eutrophication) influence natural (freshwater) ecosystems.

For more details and information, please contact:

Dr. Lawrence J. Weider, Professor of Zoology
Director, The University of Oklahoma Biological Station (UOBS)
University of Oklahoma
Norman, OK 73019
Phone: 1-405-325-4766 or 325-7438
FAX: 1-405-325-0835
ljweider@ou.edu<mailto:ljweider@ou.edu>
http://www.ou.edu/uobs/weider.html

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