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 GEER'10 Conference

Selected Slide Shows       (CLICK pictures for full PDFs)   

Greater Everglades Ecosystem Restoration

Conference in Naples, FL - July 12-16, 2010
This major Conference consisted of ORAL presentations (with SLIDES) and POSTERS, attracting more than 500 participants. A special web-page is devoted to GEER'10 oral presentations.
Full SLIDE shows are available for viewing, some supported by VIDEOS.
POSTER files are more dificult to obtain from the authors and only some selected posters could be posted for viewing on the web-site (please click the LINKS).
Recent slide presentations               for you here as available - -
AQUIFER RECHARGE CONFERENCE             (held in Orlando, Sept.2011):
l Ephemeral Arsenic: 2 Years, 3 Cycles at Kissimmee River ASR Site Show "Natural Attenuation" of Arsenic (by J. Mirecki, Hydrogeologist, US-ACE, Jacksonville FL)
l Utilizing ASR for Cost-Effective Water Resource Management and Ecological Restoration at the SFWMD (by R. Verrastro, Hydrologist, SFWMD, W-Palm Beach, FL)
NEXT slide presentation will be entered here when available

The Everglades Foundation
   Fellowship Symposium - FIU, January 2010    
Measuring aquatic ecosystem metabolism in the southern Everglades. Koch, G., Stæhr, P.A., Gaiser, E.E. & Childers, D.L.
Everglades restoration calls for an increase in water delivery to the major watersheds of Everglades National Park. The responses of the estuarine end-members of these watersheds to hydrologic restoration are not entirely understood. Carbon fluxes were studied in estuarine Taylor River, an important linkage between Taylor Slough and Florida Bay, that are related to seasonal changes in hydrology and other environmental drivers.  We present daily estimates of whole-ecosystem, aquatic metabolism derived from high-frequency (10 minute) changes in water column dissolved oxygen.  By measuring environmental variables at very fast increments we obtain data that are very sensitive to subtle environmental dynamics.
Effect of phosphorus enrichment on periphyton structure, composition, and metabolism. Munyon, J. & Gaiser, E.E. (FIU - Miami, FL)
Periphyton is one of the most productive elements in the Florida Everglades ecosystem (17-10,371 g C m-2 yr-1) existing as cohesive mats that attain biomass levels higher than those found in many other wetlands. Historically oligotrophic Everglades (water total P < 10 ug L-1) is sensitive to this limiting nutrient that can alter the ecosystem.  Small increases in P loading can result in major changes to periphyton productivity, structure, and composition and this was studied. Dissolved oxygen, mat biomass, composition, nutrients and extracellular polysaccharide (EPS) concentrations were measured before and after a 4 day incubation period.  Results show significant differences in EPS concentrations (p = 0.011) when enriched with phosphorus.
Development of In-field Portable Sensor for Detection of Phosphates and Heavy Metals in Everglades Water Systems. Prahbukar, S. (FIU - Miami, FL)
Improvement of Everglades water quality is an important factor that is addressed by the CERP as high levels of heavy metals and phosphorus are a primary cause of concern. Transportation of water samples for analysis causes accuracy problems calling for a rapid, low cost, easy-to-use, multiarray, magnetic electrochemical sensor in a lab-on-a-chip format. Magnetic nanoparticles coated with chemicals that show an affinity for heavy metals will enable preconcentration and highly sensitive detection using small sample volumes. A multianalyte chip based sensing system that can be used for in the field, and anywhere else, is being developed.
The Importance of Seagrassin Upper Florida Bay in Modulating Flow, Waves, and Sediment Dynamics. Romanowich, J. (U-of-Virginia)
Seagrass meadows are highly productive ecosystems with great ecological and socioeconomic significance. The ability to reliably describe and predict the success of both standing and restored meadows in response to environmental change is not yet possible. Of particular interest in seagrass ecosystems is the influence of these biological structures on hydrodynamics as it relates to fluid retention as well as sediment and nutrient transport. This study proposes comprehensive and novel field studies of combined hydro-, sediment, and nutrient dynamics in seagrass meadows, within the Florida Everglades under variable wave and tide conditions.
Trade-offs between nutrient and predator effects conceal the influence of canals on snails. Ruehl, C. & Traxler, J. (FIU - Miami, FL)
Canals are used to control flooding and they deliver phosphorus rich waters to adjacent marshes. That can increase periphyton quality and increased predators near canals. Predators affect prey in two ways: by killing them and scaring them. The effects of phosphorus enrichment and increased predation threats near canals were isolated by switching periphyton between sites near (enriched) and far (ambient) from canals in experimental bags. Snails grew fastest on periphyton that originated near canals (enriched) but that was placed far from canals (less risky) signifying that enriched periphyton stimulates growth, while predator cues depress snail growth. However, the net effects are similar because the strong factors near the canal cancel out.
Groundwater‐Surface Water interactions on Satinleaf Tree Island, Everglades National Park. Sullivan, P. (FIU - Miami, FL)
Since the 1940’s there has been marked loss in tree island cover across the Everglades, which has been attributed to the altered hydrology. They provide a critical refuge for flora and fauna that require the increased elevation and nutrients found on these islands. In order to better understand the hydrology of tree islands, groundwater and surface water levels and chemistry were monitored on Satinleaf tree island. The interaction between the groundwater and surrounding surface water was driven by three main mechanisms: evapotranspiration, water levels, and rainfall amounts. In addition, the interaction between groundwater and surface played an important role in the transport of nutrients and ions within the tree island.
Linking hydroperiodwith water use and nutrient accumulation in Everglades tree island habitats. Wang, X., Sternberg, L., Engel, V., & Ross, M. (U-of-Miami)
The tree island upland hammock plant communities in the Florida Everglades accumulate nutrients to a much greater extent than the surrounding fresh water marshes. Stable isotopes, transpiration analysis, and remote sensing were used to understand this nutrient accumulation mechanism. Prairie tree islands, located in a drier landscape, suffer greater water deficits during the dry season than slough tree islands. The water limited prairie tree islands harvest less phosphorus from the surrounding marshes than slough tree islands. These findings are consistent with the transpiration driven nutrient harvesting chemohydrodynamic model.
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