Megan Fork, currently my MS student at FIU, and Anna Braswell, who received her MS from the University of Alabama, have both accepted positions in my lab through the Environment Ph.D. program.
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Our paper describing diel and longitudinal patterns of nitrogen isotopes in the Ichetucknee River was just published in the Journal of Geophysical Research - Biogeosciences. You can get it here.
Building on our previous studies of diel variation in nutrient chemistry, we found large variation in N isotopes in the Ichetucknee River, FL. Unfortunately, it appears that uptake by plants (autotrophic assimilation) and denitrifying microbes have similar effects in this system, so we were not able to discriminate between these pathways. On the plus side, we observed some novel behaviors such as diel hysteresis, and found evidence that denitrification varies over the course of the day. Check it out! This is the home page of the Heffernan Lab at Duke University. We are part of the Ecohydrology and Hydroecology Research Group in the Nicholas School of the Environment at Duke University. Here you can find all sorts of information about our research, teaching, and outreach. If you have any questions, contact Dr. Heffernan. Feel free to look around!
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Welcome!This is the homepage of the Heffernan Lab at Duke University. Here you can find all sorts of information about our research, teaching, and outreach. If you have any questions, contact Dr. Heffernan. 
Dr. Jim HeffernanI am an Assistant Professor in the Nicholas School of the Environment at Duke University. My research is focused on the causes and consequences of major changes in ecosystem structure, mostly in streams and wetlands. Archives
May 2018
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