Our new Ecological Monograph on diel variation of phosphorus in the Ichetucknee River is available online as an unformatted pre-print. I am really excited about this paper, which was led by Matt Cohen at the University of Florida. Basically this paper extends our previous research on diel variation in NO3 to estimate P uptake by vegetation in a spring-fed river, but with several interesting wrinkles. First, to understand how biotic processes influence diel variation in P, we had to correct for the precipitation of calcite in the water column, because P binds strongly to it. Second, the P budget for the Ichetucknee River suggests that there are unaccounted inputs, which is consistent with what we have found based on other elements. Third, the diel variation of P is out of phase with that of O2 and NO3, which may represent differential timing of the cellular processes that metabolize these different elements. Nonetheless, the stoichiometry of C,N,and P uptake that we estimate based on diel variation matches pretty well with the stoichiometry of the dominant plants in the river. With all these different as
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 Heffernan
I 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.
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