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Graduate Students Project
Barron, Alex
Ecology and Evolutionary Biology With Hedin, they have initiated a project in Panamanian forests (in collaborations with Smithsonian Tropical Research Institute) to understand the role of symbiotic and asymbiotic nitrogen fixers in determing the nitrogen richness, and stoichiometric rations in tropical rain forests.

Caylor, Kelly K. Civil and Environmental Engineering Caylor's research and teaching interests are focused on understanding the couplings between mechanisms of spatial pattern formation and temporal dynamics in terrestrial ecosystems across a wide range of scales. These interests are addressed through the use of ecological models, remote-sensing analysis, and field observation.

Deutsch, Curtis

Program in Atmospheric and Oceanic Sciences Working with Sigman on a modeling study to develop a quantitative theoretical framework for the use of paleoceanographic records of N isotope composition to constrain past variations in the N cycle.

Houlton, Ben

Ecology and Evolutionary Biology Houlton and Hedin are monitoring nitrogen cycling and nitrogen isotope ratios on Maui and Kauai, developing quantitative theories of how the nitrogen cycle is linked to carbon cycles across rainfall gradients. In addition working with Knapp to use the stable isotopes of nitrogenous species to constrain the N budgets in terrestrial and marine ecoystems.

Keisman, Jennifer Ecology and Evolutionary Biology Working with Hedin, they are adopting a phylogenetic approach to understand how leaf chemistry interacts with soil microbial communities and plant-soil stoichiometric feedbacks.

Knapp, Angela

Geosciences

Working with Hedin, Sigman and Houlton to use the stable isotopes of nitrogenous species to constrain the N budgets in terrestrial and marine ecoystems. This work takes advantage of a new method developed in Sigman’s lab for the isotopic analysis of dissolved organic nitrogen in fresh and saline waters.
 
Postdoctoral Researchers
Daufresne, Tanguy Ecology and Evolutionary Biology Daufresne and Hedin have developed a model of plant interactions/competition with differential loss rates regulating co-existence. In addition, developing models in collaboration with Klausmeier and Levin, for the evolution of stoichiometric constants.

Ho, Tung-Yuan Geosciences Researcher in Morel's group and working in collaboration with Falkowski (Rutgers), to determine “extended Redfield ratios” in marine phytoplankton. The major goal of this project is to directly measure the intracellular C, N, P, S, Mn, Fe, Co, Ni, Cu, Zn, Mo and Cd quotas to determine the average extended Redfield ratio for these elements in marine phytoplankton culture.

McGroddy, Megan
Ecology and Evolutionary Biology Collaborating with scientists at Indiana University in studies of forests throughout the Amazon basin. In addition, working with L. Hedin and T. Baisden (Landcare), have set up collaboration to measure nutrient losses in streams across several ecological gradients in New Zealand.

Milligan, Allen Geosciences Milligan is studying the interactions among major phytoplankton nutrients particularly carbon and silicon.

 
Robinson-Graham, Rebecca Geosciences Developing the methods necessary to use the geologic past as an archive of "natural experiments" for the interaction of oceanic nutrients and their response to enviornmental perturbations.

Tang, Degui Geosciences Working with Ho, Morel, and Milligan to establish the extended Redfield ratio data set for approximately 20 species of marine phytoplankton including diatoms, dinoflagellates, prymnesiophytes (coccolithophores), chlorophytes, and prasinophytes.


March 15, 2005
Webpage contact: amyb@princeton.edu
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Princeton University, Princeton, NJ 08544-1003