Thrust Areas Ecosystem Water Institute Classification Level
Water, Land Use and Ecosystems Water and Climate Water and Society Water Resources Sustainability Springs Wetlands Watersheds Aquifers Lakes Coastal Zone  Water Institute Classification 1  Water Institute Classification 2  Water Institute Classification 3  Water Institute Classification 4

Collaborative Research: Controls on Delivery and Fate of Water, Nitrogen and Calcium in a Spring-Fed Karst River
Goals and Objectives
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.
Planned Outputs
Final Report
Journal Articles
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, VĂ©ronique de Montety, Jonathan B. Martin, Matthew J. Cohen, Chad R. Foster

Title: 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

Title: 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

Title: 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

Title: 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

Title: 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

Title: 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

Title: 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
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
Level 3: WI Directed Project
Water, Land Use and Ecosystems
Partner Name(s)
Florida International University
Grant Award Dates
3/1/2009 to 2/28/2013