Collaborative Research: Controls on Delivery and Fate of Water, Nitrogen and Calcium in a Spring-Fed Karst River

National Science Foundation

Award Dates
03/01/2009 – 02/28/2013


Project Lead
Graham, Wendy Dimbero

Project Participants
Cohen, Matthew J
Graham, Wendy Dimbero
Martin, Jonathan Bowman

Additional Participants
Joseph Delfino
Jim Heffernam (FIU)
Ray Thomas

Goals and Objective

This funding explores the biotic and hydrology controls over riverine elemental cycles, focusing of N (of particular relevance because of high levels of N enrichment in the regional groundwater system) and Ca (relevant because the mechanisms of spring-river channel formation are unknown. In addition to developing detailed elemental budgets for these elements under different hydrologic regimes, we have leveraged this money to examine more closely the link between discharge and water age in an effort to better reconcile the links between discharge concentrations of key contaminants and the reported extremely long lags (ca. 30 years) between recharge in the springshed and discharge at the spring vent. This work is in collaboration with Florida International University.

Available Outputs

Title: Algal blooms and the nitrogen-enrichment hypothesis in Florida springs: evidence, alternatives, and adaptive management, Ecological Applications, 20(3), 2010, pp. 816-829
Authors: Heffernan, J. B., Liebowitz, D. M., Frazer, T. K., Evans, J. M. and M. J. Cohen
Title: Controls on diel metal cycles in a biologically productive carbonate-dominated river
Authors: Marie J. Kurz, Véronique de Montety, Jonathan B. Martin, Matthew J. Cohen, Chad R. Foster
Denitrification and inference of nitrogen sources in the karstic Floridan Aquifer. Biogeosciences 9, 1671-1690. doi:10.5194/bg-9-1671-2012
Authors: Heffernan, J. B., A. Albertin, M. Fork, B. Katz, and M.J. Cohen
Diel Phosphorus Variation and the Stoichiometry of Ecosystem Metabolism in a Large Spring-Fed River.
Authors: Cohen, M.J., Marie J. Kurz, James B. Heffernan, Jonathan B. Martin, Rachel L. Douglass, Chad R. Foster, and Ray G. Thomas
Environmentally-mediated consumer control of algal proliferation in Florida springs
Authors: Dina M. Liebowitz,Matthew J. Cohen, James B. Heffernan, Lawrence V. Korhnak and Thomas K. Frazer
Nitrate reduction mechanisms and rates in an unconfined eogenetic karst aquifer at two sites with different redox potential, Journal of Geophysical Research- Biogeosciences, doi:10.1002/2016JG003463
Authors: Henson, W. R., G. Huang, W.D. Graham, and A. Ogram
Organic and inorganic carbon dynamics in a karst aquifer: Santa Fe River Sink-Rise system, north Florida, USA. Journal of Geophysical Research: Biogeosciences. 2014. Vol 119, Issue 3 340-357. doi:10.1002/2013JG002350.
Authors: Jin, J., A. R. Zimmerman, P. J. Moore and J. B. Martin
Spatially Distributed Denitrification in a Karst Springshed
Authors: Henson, W.R., M. J. Cohen, and W.D. Graham
Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA. Biogeochemistry, Vol. 122, Issue 1, pgs. 131-150, 2015.
Authors: Jin, J., A. R. Zimmerman, J. B. Martin, M. B. Khadka
Transport of dissolved carbon and CO2 degassing from a river system in a mixed silicate and carbonate catchment. Journal of Hydrology. 2014. 513: 391-402
Authors: Khadka, M. B., J. B. Martin, J. Jin