Spatial Distribution of Soil Nutrients in a Northern Everglades Marsh: Water Conservation Area 2A

DeBusk, W. F.; Reddy, K. R.; Koch, Marguerite S.; Wang, Y.

doi:10.2136/sssaj1994.03615995005800020042x

Cited by 128 publications

(95 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Changes with regard to the effects of nutrient enrichment on biogeochemical cycling in the Everglades have been well documented (9,11,13,22), although detailed characterization at on May 10, 2018 by guest http://aem.asm.org/ the microbial level is required to understand the effects of eutrophication on processes governing biogeochemical cycles. This is the first microbial study of which we are aware to characterize the diversity and function of SRP in a freshwater wetland such as the Everglades or to characterize potential relationships between phylogenetic groups of SRP and the nutrient status of their environment.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Composition and Function of Sulfate-Reducing Prokaryotes in Eutrophic and Pristine Areas of the Florida Everglades

Castro¹,

Reddy²,

Ogram

2002

Appl Environ Microbiol

Self Cite

108

View full text Add to dashboard Cite

As a result of agricultural activities in regions adjacent to the northern boundary of the Florida Everglades, a nutrient gradient developed that resulted in physicochemical and ecological changes from the original system. Sulfate input from agricultural runoff and groundwater is present in soils of the Northern Everglades, and sulfate-reducing prokaryotes (SRP) may play an important role in biogeochemical processes such as carbon cycling. The goal of this project was to utilize culture-based and non-culture-based approaches to study differences between the composition of assemblages of SRP in eutrophic and pristine areas of the Everglades. Sulfate reduction rates and most-probable-number enumerations revealed SRP populations and activities to be greater in eutrophic zones than in more pristine soils. In eutrophic regions, methanogenesis rates were higher, the addition of acetate stimulated methanogenesis, and SRP able to utilize acetate competed to a limited degree with acetoclastic methanogens. A surprising amount of diversity within clone libraries of PCR-amplified dissimilatory sulfite reductase (DSR) genes was observed, and the majority of DSR sequences were associated with gram-positive spore-forming Desulfotomaculum and uncultured microorganisms. Sequences associated with Desulfotomaculum fall into two categories: in the eutrophic regions, 94.7% of the sequences related to Desulfotomaculum were associated with those able to completely oxidize substrates, and in samples from pristine regions, all Desulfotomaculum-like sequences were related to incomplete oxidizers. This metabolic selection may be linked to the types of substrates that Desulfotomaculum spp. utilize; it may be that complete oxidizers are more versatile and likelier to proliferate in nutrient-rich zones of the Everglades. Desulfotomaculum incomplete oxidizers may outcompete complete oxidizers for substrates such as hydrogen in pristine zones where diverse carbon sources are less available.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Nutrient-enriched runoff from the Everglades Agricultural Area (EAA) resulted in a well-documented phosphorus gradient in Florida Everglades Water Conservation Area 2-A (WCA-2A) (9,11,13,22,30). These nutrient inputs resulted in changes in vegetation and biogeochemical cycling.…”

mentioning

confidence: 99%

Composition and Function of Sulfate-Reducing Prokaryotes in Eutrophic and Pristine Areas of the Florida Everglades

Castro¹,

Reddy²,

Ogram

2002

Appl Environ Microbiol

Self Cite

108

View full text Add to dashboard Cite

show abstract

“…Wetlands, including the Everglades, are the primary source of natural global CH 4 emissions, producing more than 150 Tg of CH 4 annually (roughly 20% of global annual emissions) (2,3). The Everglades ecosystem was historically limited in nutrients, particularly phosphorus (P); however, the discharge of agricultural drainage from the adjacent Everglades Agricultural Area (EAA) led to elevated nutrient levels in the northern Everglades, particularly in Water Conservation Area 2A (WCA-2A), which is characterized by a well-documented gradient in soil and water P concentrations (4)(5)(6)(7). The alleviation of P limitation resulted in many changes to the WCA-2A ecosystem; primary productivity was significantly increased, and the dominant plant species changed from saw grass to cattail.…”

mentioning

confidence: 99%

Distribution, Activities, and Interactions of Methanogens and Sulfate-Reducing Prokaryotes in the Florida Everglades

Bae

Holmes

Chanton

et al. 2015

Appl Environ Microbiol

View full text Add to dashboard Cite

bTo gain insight into the mechanisms controlling methanogenic pathways in the Florida Everglades, the distribution and functional activities of methanogens and sulfate-reducing prokaryotes (SRPs) were investigated in soils (0 to 2 or 0 to 4 cm depth) across the well-documented nutrient gradient in the water conservation areas (WCAs) caused by runoff from the adjacent Everglades Agricultural Area. The methyl coenzyme M reductase gene (mcrA) sequences that were retrieved from WCA-2A, an area with relatively high concentrations of SO 4 2؊ (>39 M), indicated that methanogens inhabiting this area were broadly distributed within the orders Methanomicrobiales, Methanosarcinales, Methanocellales, Methanobacteriales, and Methanomassiliicoccales. In more than 3 years of monitoring, quantitative PCR (qPCR) using newly designed group-specific primers revealed that the hydrogenotrophic Methanomicrobiales were more numerous than the Methanosaetaceae obligatory acetotrophs in SO 4 2؊ -rich areas of WCA-2A, while the Methanosaetaceae were dominant over the Methanomicrobiales in WCA-3A (with relatively low SO 4 2؊ concentrations; <4 M). qPCR of dsrB sequences also indicated that SRPs are present at greater numbers than methanogens in the WCAs. In an incubation study with WCA-2A soils, addition of MoO 4 2؊ (a specific inhibitor of SRP activity) resulted in increased methane production rates, lower apparent fractionation factors [␣ app ; defined as (amount of ␦ 13 CO 2 ؉ 1,000)/ (amount of ␦ 13 CH 4 ؉ 1,000)], and higher Methanosaetaceae mcrA transcript levels compared to those for the controls without MoO 4 2؊ . These results indicate that SRPs play crucial roles in controlling methanogenic pathways and in shaping the structures of methanogen assemblages as a function of position along the nutrient gradient.

show abstract

“…This soil phosphorus gradient has been widely documented and studied (DeBusk et al 1994;Grunwald et al 2004Grunwald et al , 2008Rivero et al 2007a,b;Grunwald 2010). Given the unavailability of spatial soil phosphorus data beyond map classifications (Grunwald 2010), soil phosphorus input maps were created by overlaying the WCA2A mesh on the existing maps obtained from Grunwald et al (2004Grunwald et al ( , 2008.…”

Section: Soil Phosphorusmentioning

confidence: 92%

A spatially distributed, deterministic approach to modeling Typha domingensis (cattail) in an Everglades wetland

et al. 2012

View full text Add to dashboard Cite

Introduction: The emergent wetland species Typha domingensis (cattail) is a native Florida Everglades monocotyledonous macrophyte. It has become invasive due to anthropogenic disturbances and is out-competing other vegetation in the region, especially in areas historically dominated by Cladium jamaicense (sawgrass). There is a need for a quantitative, deterministic model in order to accurately simulate the regional-scale cattail dynamics in the Everglades. Methods: The Regional Simulation Model (RSM), combined with the Transport and Reaction Simulation Engine (TARSE), was adapted to simulate ecology. This provides a framework for user-defineable equations and relationships and enables multiple theories with different levels of complexity to be tested simultaneously. Five models, or levels, of increasing complexity were used to simulate cattail dynamics across Water Conservation Area 2A (WCA2A), which is located just south of Lake Okeechobee, in Florida, USA. These levels of complexity were formulated to correspond with five hypotheses regarding the growth and spread of cattail. The first level of complexity assumed a logistic growth pattern to test whether cattail growth is density dependent. The second level of complexity built on the first and included a Habitat Suitability Index (HSI) factor influenced by water depth to test whether this might be an important factor for cattail expansion. The third level of complexity built on the second and included an HSI factor influenced by soil phosphorus concentration to test whether this is a contributing factor for cattail expansion. The fourth level of complexity built on the third and included an HSI factor influenced by (a level 1-simulated) sawgrass density to determine whether sawgrass density impacted the rate of cattail expansion. The fifth level of complexity built on the fourth and included a feedback mechanism whereby the cattail densities influenced the sawgrass densities to determine the impact of inter-species interactions on the cattail dynamics. Results: All the simulation results from the different levels of complexity were compared to observed data for the years 1995 and 2003. Their performance was analyzed using a number of different statistics that each represent a different perspective on the ecological dynamics of the system. These statistics include box-plots, abundance-area curves, Moran's I, and classified difference. The statistics were summarized using the Nash-Sutcliffe coefficient. The results from all of these comparisons indicate that the more complex level 4 and level 5 models were able to simulate the observed data with a reasonable degree of accuracy.

show abstract

Spatial Distribution of Soil Nutrients in a Northern Everglades Marsh: Water Conservation Area 2A

Cited by 128 publications

References 0 publications

Composition and Function of Sulfate-Reducing Prokaryotes in Eutrophic and Pristine Areas of the Florida Everglades

Composition and Function of Sulfate-Reducing Prokaryotes in Eutrophic and Pristine Areas of the Florida Everglades

Distribution, Activities, and Interactions of Methanogens and Sulfate-Reducing Prokaryotes in the Florida Everglades

A spatially distributed, deterministic approach to modeling Typha domingensis (cattail) in an Everglades wetland

Contact Info

Product

Resources

About