Everglades: The Ecosystem and Its Restoration

Davis, Steve; Ogden, John C.

doi:10.2307/1521832

Cited by 151 publications

(86 citation statements)

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“…Another such focal point was observed in 3AN where the S339 WCS delivers water from the Miami Canal into the interior of 3AN. Plant cover data from WCA-3 showed that Typha had become dominant in these areas by the early 1990s (Davis & Ogden, 1994). While the 1992 map indicated that TPm values in certain areas were elevated (500-1,600 mg kg −1 range), these values were still not as high as those observed in enriched areas of WCA-2A (1,900-3,750 mg kg −1 ) (Grimshaw, Rosen, Swift, Rodberg, & Noel, 1993;McCormick & O'Dell, 1996;Grunwald, Reddy, Newman, & DeBusk, 2004).…”

Section: Geostatistical Analysesmentioning

confidence: 99%

Recent Changes in Soil Total Phosphorus in the Everglades: Water Conservation Area 3

Bruland

Osborne

Reddy

et al. 2006

Environ Monit Assess

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We assessed recent changes in the distribution of soil total phosphorus (TP) in Water Conservation Area 3 (WCA-3) of the Everglades. Soil cores were collected in 1992 and 2003 at 176 sites. To reflect hydrologic boundaries within the system, WCA-3 was divided into three zones (3AN, 3AS, and 3B). Total P was mapped on both a mass (TPm) and a volumetric basis (TPv) to determine if spatial distributions varied depending on the choice of units.Interpolated maps for both years showed that the highest levels of TPm were located in 3AN and in boundary areas of all zones that received surface water inputs of P from canals. Increases in TPm were greatest in central 3AN in an area adjacent to the Miami Canal that received inputs from a water control structure. Interpolated maps for TPv illustrated that a hotspot present in 1992 had disappeared by 2003. The highest levels of TPv in 2003 were located in northwestern 3AN, a region of WCA-3 that has been chronically overdrained and burned in 1999. From 1992 to 2003, increases in TPm were observed for 53% of the area of WCA-3, while only 16% of WCA-3 exhibited increases in TPv. In 1992, approximately 21% of WCA-3 had TPm concentrations in the 0-10 cm layer > 500 mg kg −1 , indicating P enrichment beyond historic levels. Eleven years later, 30% of the area of WCA-3 had TPm > 500 mg kg −1 . This indicated that during this period, the area of WCA-3 with enriched TPm concentrations increased about one % year −1 .

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Section: Geostatistical Analysesmentioning

confidence: 99%

Recent Changes in Soil Total Phosphorus in the Everglades: Water Conservation Area 3

Bruland

Osborne

Reddy

et al. 2006

Environ Monit Assess

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“…Vegetation in this wetland ecosystem has been affected by a variety of anthropogenic influences in the past several decades, which has led to a surge of recent studies designed to infer the causes of observed changes. Reputedly sustained by fire and hydropattern (Loveless 1959;Craighead 1971) while limited by phosphorus Ornes 1975a, 1975b;Davis 1991;Noe and others 2001), the historic heterogeneous mosaic of vegetation communities described by Davis (1943) has been altered by disruption of natural environmental variation and degradation of water quality (SFWMD 1992;Davis and Ogden 1994). However, intercorrelations and spatial autocorrelation of multiple factors have made it difficult to isolate the linkages between specific environmental variables and observed changes in vegetation patterns.…”

Section: Introductionmentioning

confidence: 99%

Spatial Dependency of Vegetation?Environment Linkages in an Anthropogenically Influenced Wetland Ecosystem

et al. 2004

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“…TP in these interior, reference areas of WCA-2A typically ranges between 5-10 g/L, while often exceeding 100 g/L in areas near inflow structures on the Hillsboro Canal (Vaithiyanathan and Richardson 1998; SFWMD 2000). Maps and greater detail about physical and chemical characteristics of the study area are provided in Davis and Ogden (1994), others (1999), SFWMD (2000), and King and Richardson (2002). …”

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confidence: 99%

Integrating Bioassessment and Ecological Risk Assessment: An Approach to Developing Numerical Water-Quality Criteria

King

Richardson

2003

Environmental Management

139

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/ ioassessment is used worldwide to monitor aquatic health but is infrequently used with risk-assessment objectives, such as supporting the development of defensible, numerical water-quality criteria. To this end, we present a generalized approach for detecting potential ecological thresholds using assemblage-level attributes and a multimetric index (Index of Biological Integrity-IBI) as endpoints in response to numerical changes in water quality. To illustrate the approach, we used existing macroinvertebrate and surface-water total phosphorus (TP) datasets from an observed P gradient and a P-dosing experiment in wetlands of the south Florida coastal plain nutrient ecoregion. Ten assemblage attributes were identified as potential metrics using the observational data, and five were validated in the experiment. These five core metrics were subjected individually and as an aggregated Nutrient-IBI to nonparametric changepoint analysis (nCPA) to estimate cumulative probabilities of a threshold response to TP. Threshold responses were evident for all metrics and the IBI, and were repeatable through time. Results from the observed gradient indicated that a threshold was Ն50% probable between 12.6 and 19.4 g/L TP for individual metrics and 14.8 g/L TP for the IBI. Results from the P-dosing experiment revealed Ն50% probability of a response between 11.2 and 13.0 g/L TP for the metrics and 12.3 g/L TP for the IBI. Uncertainty analysis indicated a low (typically Ն5%) probability that an IBI threshold occurred at Յ 10 g/L TP, while there was Ն95% certainty that the threshold was Յ 17 g/L TP. The weight-of-evidence produced from these analyses implies that a TP concentration Ͼ 12-15 g/L is likely to cause degradation of macroinvertebrate assemblage structure and function, a reflection of biological integrity, in the study area. This finding may assist in the development of a numerical waterquality criterion for TP in this ecoregion, and illustrates the utility of bioassessment to environmental decision-making.Bioassessment has become a widely accepted technique for monitoring aquatic health in streams, lakes, and wetlands throughout the world (Rosenberg and Resh 1993). Bioassessment has a long history in Europe (reviewed by Cairns and Pratt 1993) and has more recently become popular in North America, largely in response to the mandate of §101(a) of the Clean Water Act (CWA) to restore and maintain the biological integrity of the USA's waters (Karr 1981). One bioassessment approach that has received considerable attention in the USA is the multimetric approach (sensu Karr 1981). Multimetric indices, such as the Index of Biological Integrity (e.g., Karr and Chu 1997), are an aggregation of a suite of biological attributes that represent key elements of structure or function of an aquatic assemblage and show a consistent, predictable response to human influence. The strength of multimetric assessments lies in their ability to integrate multiple facets of biological condition (Barbour and others 1995), and thus provid...

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Everglades: The Ecosystem and Its Restoration

Cited by 151 publications

References 0 publications

Recent Changes in Soil Total Phosphorus in the Everglades: Water Conservation Area 3

Recent Changes in Soil Total Phosphorus in the Everglades: Water Conservation Area 3

Spatial Dependency of Vegetation?Environment Linkages in an Anthropogenically Influenced Wetland Ecosystem

Integrating Bioassessment and Ecological Risk Assessment: An Approach to Developing Numerical Water-Quality Criteria

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