Spatial, geomorphological, and seasonal variability of CDOM in estuaries of the Florida Coastal Everglades

Maie, Nagamitsu; Boyer, Joseph N.; Yang, Chenyong; Jaffé, Rudolf

doi:10.1007/s10750-006-0128-x

Cited by 76 publications

(54 citation statements)

References 33 publications

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“…of older DOM during the dry season may also help explain the seasonal differences in bioavailability (Maie et al, 2006). BDOC estimates from this study were low but comparable to other studies with low anthropogenic impacts (Table 3).…”

supporting

confidence: 85%

“…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 (Maie et al, 2006). The highest bioavailability that we observed was from the Whipray Basin site with 2ÂDOM treatment (35.5%).…”

Section: Bioavailability Of Dissolved Organic Carbon (Bdoc)mentioning

confidence: 70%

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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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supporting

confidence: 85%

Section: Bioavailability Of Dissolved Organic Carbon (Bdoc)mentioning

confidence: 70%

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

et al. 2006

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“…The magnitudes of DOC and FDOM fluxes from rivers are generally dependent on rainfall, discharge, and temperature (Maie et al, 2006;Jaffé et al, 2004;Huang and Chen, 2009). In the estuarine mixing zone, intensive biogeochemical processes occur through photooxidation, microbial degradation, or physicochemical transformations (i.e., flocculation, sedimentation; Bauer and Bianchi, 2011;Moran et al, 1991;Benner and Opsahl, 2001;Raymond and Bauer, 2001).…”

Section: Introductionmentioning

confidence: 99%

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

Lee¹,

Kim²

2018

Biogeosciences

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Abstract. We monitored seasonal variations in dissolved organic carbon (DOC), the stable carbon isotope of DOC (δ 13 C-DOC), and fluorescent dissolved organic matter (FDOM) in water samples from a fixed station in the Nakdong River Estuary, Korea. Sampling was performed every hour during spring tide once a month from October 2014 to August 2015. The concentrations of DOC and humic-like FDOM showed significant negative correlations against salinity (r 2 = 0.42-0.98, p < 0.0001), indicating that the river-originated DOM components were the major source and behave conservatively in the estuarine mixing zone. The extrapolated δ 13 C-DOC values (−27.5 to −24.5 ‰) in fresh water confirm that both components are mainly of terrestrial origin. The slopes of humic-like FDOM against salinity were 60-80 % higher in the summer and fall due to higher terrestrial production of humic-like FDOM. The slopes of proteinlike FDOM against salinity, however, were 70-80 % higher in spring due to higher biological production in river water. Our results suggest that there are large seasonal changes in riverine fluxes of humic-and protein-like FDOM to the ocean.

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“…phytoplankton, nutrients, zooplankton); (2) oysters are only put into the system when the water temperature will support growth and are removed once they reach 25 mm; therefore, the load to the system changes weekly; and (3) this embayment is affected by many other seasonal human activities (boating, fishing, dredging). However, because the FLUPSY takes water from the embayment (input) and has a known discharge pipe, we can use the fixed-station, estuarine-transect approach commonly used in estuaries to determine anthropogenic point and non-point sources in a watershed (Cutter & San Diego-McGlone 1990, Maie et al 2006, Wu et al 2012. This approach involves a 2-step process: (1) quantification of the inputs (nutrients, total suspended material [TSM], chlorophyll [chl] a) from the freshwater endmember (salt marsh), saltwater endmember (Great Peconic Bay), sediments within the embayment, and the FLUPSY; and (2) sampling a fixed-station, estuarine transect during different time periods throughout the season when the FLUPSY is utilized.…”

Section: Introductionmentioning

confidence: 99%

Effects of a commercial, suspended eastern oyster nursery upon nutrient and sediment chemistry in a temperate, coastal embayment

Meseck¹,

Li²,

Dixon³

et al. 2012

Aquacult. Environ. Interact.

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We explored chemical effects of a commercial Floating-Upwelling-System (FLUPSY) stocked with juvenile oysters Crassostrea virginica in a small embayment. Water from the FLUPSY outflow was analyzed for nutrients (total ammonia, nitrate+nitrite, phosphate, and silicate), total suspended material (TSM), chlorophyll (chl) a, and particulate organic carbon and nitrogen (C:N). The output from the FLUPSY was compared to estuarine transects in the Bay to determine if any outputs from the FLUPSY could be detected within the embayment. Sediment samples taken near the FLUPSY and throughout the embayment were analyzed for fluxes of total ammonia, hydrogen sulfide, and oxygen. Dissolved nutrient concentrations in the FLUPSY output were no higher than in the rest of the embayment. There were, however, elevated concentrations of TSM and chl a near the FLUPSY compared to other sites in the embayment. Furthermore, suspended organic matter near the FLUPSY had a C:N ratio near the Redfield ratio, while the rest of the embayment had an elevated C:N ratio indicative of phytoplankton nitrogen limitation. These findings suggest that nutrient recycling by microbes may have been occurring in the vicinity of the FLUPSY. Sediment data showed no difference in fluxes of oxygen, hydrogen sulfide, or total ammonia between the FLUPSY output and elsewhere in the embayment. These findings suggest that the FLUPSY had very minimal effects on the chemical ecology of the embayment.

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Spatial, geomorphological, and seasonal variability of CDOM in estuaries of the Florida Coastal Everglades

Cited by 76 publications

References 33 publications

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

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

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

Effects of a commercial, suspended eastern oyster nursery upon nutrient and sediment chemistry in a temperate, coastal embayment

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