Phosphorus and Nitrogen Inputs to Florida Bay: The Importance of the Everglades Watershed

Rudnick, David T.; Chen, Z.; Childers, Daniel L.; Boyer, Joseph N.; Fontaine, Thomas D.

doi:10.2307/1353207

Cited by 140 publications

(99 citation statements)

References 43 publications

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“…In upstream sites of TS/Ph, TP and TN were higher than downstream, likely due to anthropogenic nutrient loads from upstream, as per Hypothesis 2. However, TN increased downstream in TS/Ph (Figure 3b) with consequent increase in N:P (Figure 3f; Table 3), as expected (Hypothesis 3), consistent with findings by Iwaniec et al [25], but in contrast with results in Rudnick et al [58]. This trend may be due to the more limited marine P supply from Florida Bay and/or higher N supplies, as Figure 3d suggests, perhaps from agricultural activities, into the lower part of TS/Ph [28,61].…”

Section: Long-term Periphyton Nutrient Dynamics Across Spacesupporting

confidence: 91%

“…The data did show that mean TP and median TP and TN decreased from SRS 1 to SRS 3 (Figure 3a,c; Table 3), comparable to Rudnick et al [58] and Gaiser et al [29] observing a TP increase and a TN decrease downstream in SRS. In more upstream areas of the Everglades, McCormick et al [27] and Gaiser et al [29] also found TP to decrease downstream of canals.…”

Section: Long-term Periphyton Nutrient Dynamics Across Spacesupporting

confidence: 79%

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Short-Term Effects of Drying-Rewetting and Long-Term Effects of Nutrient Loading on Periphyton N:P Stoichiometry

Sola

Marazzi

Flores

et al. 2018

Water

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Nitrogen (N) and phosphorus (P) concentrations and N:P ratios critically influence periphyton productivity and nutrient cycling in aquatic ecosystems. In coastal wetlands, variations in hydrology and water source (fresh or marine) influence nutrient availability, but short-term effects of drying and rewetting and long-term effects of nutrient exposure on periphyton nutrient retention are uncertain. An outdoor microcosm experiment simulated short-term exposure to variation in drying-rewetting frequency on periphyton mat nutrient retention. A 13-year dataset from freshwater marshes of the Florida Everglades was examined for the effect of long-term proximity to different N and P sources on mat-forming periphyton nutrient standing stocks and stoichiometry. Field sites were selected from one drainage with shorter hydroperiod and higher connectivity to freshwater anthropogenic nutrient supplies (Taylor Slough/Panhandle, TS/Ph) and another drainage with longer hydroperiod and higher connectivity to marine nutrient supplies (Shark River Slough, SRS). Total P, but not total N, increased in periphyton mats exposed to both low and high drying-rewetting frequency with respect to the control mats in our experimental microcosm. In SRS, N:P ratios slightly decreased downstream due to marine nutrient supplies, while TS/Ph increased. Mats exposed to short-term drying-rewetting had higher nutrient retention, similar to nutrient standing stocks from long-term field data. Periphyton mat microbial communities may undergo community shifts upon drying-rewetting and chronic exposure to nutrient loads. Additional work on microbial species composition may further explain how periphyton communities interact with drying-rewetting dynamics to influence nutrient cycling and retention in wetlands.

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Section: Long-term Periphyton Nutrient Dynamics Across Spacesupporting

confidence: 91%

Section: Long-term Periphyton Nutrient Dynamics Across Spacesupporting

confidence: 79%

Short-Term Effects of Drying-Rewetting and Long-Term Effects of Nutrient Loading on Periphyton N:P Stoichiometry

Sola

Marazzi

Flores

et al. 2018

Water

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“…The connection between phytoplankton productivity and nutrient loading inputs to estuaries has been repeatedly demonstrated (Boynton et al, 1982). However, data from eastern Florida Bay show that while nutrient loading increases with flow through the Taylor Slough, inflowing nutrient concentrations actually decline Rudnick et al, 1999). This pattern does not follow the typical eutrophication model because the limiting nutrient actually becomes more dilute as the input flows increase.…”

Section: Introductionmentioning

confidence: 99%

The role of dissolved organic matter bioavailability in promoting phytoplankton blooms in Florida Bay

et al. 2006

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The clear, shallow, oligotrophic waters of Florida Bay are characterized by low phytoplankton biomass, yet periodic cyanobacteria and diatom blooms do occur. We hypothesized that allochthonous dissolved organic matter (DOM) was providing a subsidy to the system in the form of bound nutrients. Water from four bay sites was incubated under natural light and dark conditions with enrichments of either DOM (>1 kD, 2ÂDOM) or inorganic nutrients (N+P). Samples were analyzed for bacterial numbers, bacterial production, phytoplankton biomass, phytoplankton community structure, and production, nutrients, and alkaline phosphatase (AP) activity. The influence of 2ÂDOM enrichment on phytoplankton biomass developed slowly during the incubations and was relatively small compared to nutrient additions. Inorganic nutrient additions resulted in an ephemeral bloom characterized initially as cyanobacterial and brown algae but which changed to dinoflagellate and/or brown algae by day six. The DIN:TP ratio decreased 10-fold in the N+P treatments as the system progressed towards N limitation. This ratio did not change significantly for 2ÂDOM treatments. In addition, these experiments indicated that both autotrophic and heterotrophic microbial populations in Florida Bay may fluctuate in their limitation by organic and inorganic nutrient availability. Both N+P and 2ÂDOM enrichments revealed significant and positive response in bioavailability of dissolved organic carbon (BDOC). Potential BDOC ranged from 1.1 to 35.5%, with the most labile forms occurring in Whipray Basin. BDOC at all sites was stimulated by the 2ÂDOM addition. Except for Duck Key, BDOC at all sites was also stimulated by the addition of N+P. BDOC was lower in the dry season than in the wet season (5.56% vs. 16.86%). This may be explained by the distinct chemical characteristics of the DOM produced at different times of year. Thus, both the heterotrophic and autotrophic microbial communities in Florida Bay are modulated by bioavailability of DOM. This has ramifications for the fate of DOM from the Everglades inputs, implicating DOM bioavailability as a contributing factor in regulating the onset, persistence, and composition of phytoplankton blooms.

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“…Tortugas shrimp), (Nance 1994, Costello & Allen 1996, sport fisheries (Tilmant 1989) and manatees (McIvor et al 1994) within the bay. Although Florida Bay receives its freshwater flow from the Everglades, this flow results from managed discharge rather than from natural hydrological conditions (Rudnick et al 1999). Longterm management plans for the Southern Florida area call for restoration of the natural flow conditions within the Everglades.…”

mentioning

confidence: 99%

“…The sources of these central bay nutrients (e.g. the Everglades via Shark River Slough inputs, or local benthic or pelagic regeneration) are complex (Rudnick et al 1999). One of the major unknowns is the role of organic nutrient forms in supporting these blooms.…”

mentioning

confidence: 99%

Evidence for dissolved organic nitrogen and phosphorus uptake during a cyanobacterial bloom in Florida Bay

Glibert¹,

Heil²,

Hollander³

et al. 2004

Mar. Ecol. Prog. Ser.

169

121

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Florida Bay, a shallow, seagrass-dominated bay in southern Florida, USA, receives significant nutrient inputs and has experienced seagrass losses and microalgal blooms within the last several decades. Inorganic nutrient inputs have been well characterized, but the role of organic nutrients, specifically of dissolved organic nitrogen (DON) and organic phosphorus (DOP), in supporting microbial processes in the bay is unknown. In this study various techniques were used to assess the importance of these nutrients along a transect in Florida Bay when a cyanobacterial bloom occurred in the central region in November 2002. These techniques included measurements of ambient particulate and dissolved nutrients, enzyme (urease and alkaline phosphatase) activities, and experiments to determine rates of 15 N uptake (nitrate, ammonium, urea, and amino acids over a period of 0.5 h) and long-term (48 h) changes in microbial biomass and 15 N natural abundance in enrichment bioassays. The cyanobacterial bloom in central Florida Bay was associated with the highest concentrations of DON and DOP, whereas the microflagellate-and diatom-dominated eastern bay region was associated with the highest concentrations of inorganic nutrients. The zeaxanthin:chlorophyll a ratio (an indicator of the relative contribution of cyanobacteria to phytoplankton biomass) was positively correlated with the rate of uptake of urea, and negatively correlated with the rate of uptake of inorganic nitrogen. The opposite pattern was observed for the fucoxanthin:chlorophyll a ratio (indicative of relative diatom biomass) and the peridinin:chlorophyll a ratio (indicative of relative photosynthetic dinoflagellate biomass), suggesting that different algal groups were using different N substrates. Biomass responses in the bioassay experiments showed that phytoplankton (as chlorophyll a) responded to DON additions in the western region and to DOP additions in the eastern region, but heterotrophic bacteria, in contrast, responded to DOP additions in the west and DON additions in the east. These findings thus demonstrate the potential for different sources of N, including DON, to stimulate different components of the algal community, and for the phytoplankton and bacteria to respond differently to N and P.KEY WORDS: Florida Bay · Cyanobacteria · Organic N · Organic P · Nutrient limitation · Urease · Alkaline phosphatase · Bioassay · Nutrient uptake rates Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 280: [73][74][75][76][77][78][79][80][81][82][83] 2004 changes. Since the onset of industrialization in the 1880s, the health of the Florida Bay ecosystem has been negatively impacted on both decadal (e.g. increasing eutrophication) and centurial (e.g. changes in land use and water management practices within southern Florida) time-scales (Fourqurean & Robblee 1999). These anthropogenic changes have led to a significant alteration in freshwater flow patterns within the Everglades, causing declines in seagrass d...

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Phosphorus and Nitrogen Inputs to Florida Bay: The Importance of the Everglades Watershed

Cited by 140 publications

References 43 publications

Short-Term Effects of Drying-Rewetting and Long-Term Effects of Nutrient Loading on Periphyton N:P Stoichiometry

Short-Term Effects of Drying-Rewetting and Long-Term Effects of Nutrient Loading on Periphyton N:P Stoichiometry

The role of dissolved organic matter bioavailability in promoting phytoplankton blooms in Florida Bay

Evidence for dissolved organic nitrogen and phosphorus uptake during a cyanobacterial bloom in Florida Bay

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