ECOHYDROLOGY LAB

AT THE UNIVERSITY OF FLORIDA

My lab group focuses on ecosystem processes in wetlands, streams, lakes, aquifers and forests. While most of the work we do is in Florida, we focus on general questions that apply to watersheds and ecosystems elsewhere. Our work falls into three main areas. First, work on Florida’s spring fed and blackwater rivers. In this work we are interested in how river ecosystems and river organisms affect and are affected by nutrient supply. Second, we work in wetlands, with research on the role that geographically isolated wetlands play in watershed systems, a topic of considerable regulatory and legal importance. We also investigate pattern emergence in wetlands (Big Cypress Preserve and the Everglades, both in South Florida), with emphasis on wetland processes that raise (peat accretion) or lower (carbonate dissolution) the soil surface and thus impact hydrology, both locally and more regionally. Finally, we have recently begun work on forest water and nutrient yield as part of statewide projects exploring the role of plantation forests in landscapes subject to stringent new regulatory requirements for water quality and quantity. We adopt the same systems-level approach to those projects, and now capture the hydrologic flowpath from the ridges to the rivers.
Cohen
Matthew J. Cohen PhD.

Our Study Settings

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Springs and Karst Rivers
Florida boasts the highest density of 1st magnitude springs in the world, and some of the most storied springs in the world (Silver, Wakulla, Rainbow, Ichetucknee). As we've made progress understanding these systems, their environmental properties (unparalleled thermal, discharge, and chemical stability; extraordinarily clear water) make them absolutely incredible model systems, a fact reflected in their use in H.T. Odum's early work on ecosystem metabolism and trophic structure.

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Isolated Wetlands
Geographically isolated wetlands are critically imperiled ecosystems; by virtue of being small and not always obviously hydrologically connected, they are under-valued by our regulatory framework for wetlands protection. However, they are particularly well situated to confer to all of us the many services that wetlands provide, and because they are small and only intermittently flooded, they provide a critically important habitat setting, supporting far more than their share of threatened and rare taxa.

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Forest Watersheds and Streams
We work in the Santa Fe River, a river in north Florida that adopts the character of a black-water system at times, and is more similar to a spring-fed river at others. We use sensors to document the temporal variation of solutes that are both ecologically meaningful (nutrients, dissolved organic carbon), and that also serve as proxies for water source, their concentration can assist in deconvolving the provenance of water at all times.

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Big Cypress and Everglades
Our work in the Everglades, and the Big Cypress National Preserve, is fundamentally focused on autogenic patterned landscapes. These sites exhibit surface topography and spatial patch arrangements that can only be understood as emerging from local and spatial ecological interactions. Restoration requires that we understand the underlying processes and appropriately diagnose when they are in decline.

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Lab Opportunites

Contact Info and Location

Email: mjc@ufl.edu  -  Phone: 352.846.3490  -  Office Address: 328 Newins Ziegler Hall, Gainesville FL 32611-0410

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