Arsenic, barium, germanium, tin, dimethylsulfide and nutrient biogeochemistry in Charlotte Harbor, Florida, a phosphorus-enriched estuary

Froelich, Philip N.; Kaul, L; Byrd, James T.; Andreae, Meinrat O.; Roe, Kevin K.

doi:10.1016/0272-7714(85)90041-1

Cited by 120 publications

(42 citation statements)

References 50 publications

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“…Thus, the exhaustion of phosphate was considered to be essential for the conversion of As(V). These results are consistent with those of Sohrin et al (1997a) and Froelich et al (1985). Biological activities, which use a substantial amount of dissolved oxygen, are higher in eutrophic lakes while the activities are limited in mesotrophic lakes (AErtebjerg et al, 2003;Genkai-Kato and Carpenter, 2005;Kennish and Townsend, 2007;Moncreiff, 2002;OECD, 1982;Smith et al, 2006;Smith et al, 1999).…”

Section: Relationship Between As and Phosphate Or Chl-a In Lake Waterssupporting

confidence: 89%

Seasonal changes of arsenic speciation in lake waters in relation to eutrophication

Hasegawa

Rahman

Kitahara

et al. 2010

Science of The Total Environment

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Section: Relationship Between As and Phosphate Or Chl-a In Lake Waterssupporting

confidence: 89%

Seasonal changes of arsenic speciation in lake waters in relation to eutrophication

Hasegawa

Rahman

Kitahara

et al. 2010

Science of The Total Environment

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“…Most of this exchange is through the Boca Grande Pass at the southern end of the estuary. The Peace River is naturally enriched with dissolved phosphate from watershed phosphorites in the Bone Valley formation and from phosphate mining activities (originally in the river, and then on land after 1900s), including occasional catastrophic releases (Froelich et al 1985).…”

mentioning

confidence: 99%

“…Growth limitation of phytoplankton begins at a salinity of Ͻ10, which is within the river channel and upstream of where the estuary headwaters broaden significantly into the open water of the estuary (Froelich et al 1985). The evidence that phytoplankton production is usually nitrogen limited for most of the estuary is based on the results of nutrient bioassay experiments, analyses of nutrient concentrations along the river-to-sea continuum, and the very low N : P atomic ratios, which are typically 1 : 1 or less (Fraser and Wilcox 1981;McPherson et al 1990;Montgomery et al 1991).…”

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confidence: 99%

Paleo‐indicators and water quality change in the Charlotte Harbor Estuary (Florida)

Turner

Rabalais

Fry

et al. 2006

Limnology & Oceanography

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We reconstructed water quality changes for 1800 to 2000 in Charlotte Harbor (Florida), a shallow subtropical estuary, by using a suite of biological and geochemical proxies in dated sediments collected in the region of a present day, midsummer hypoxic zone. The declining freshwater loading into the estuary from 1931 to the 1980s is not the probable causal agent encouraging the appearance or expansion of a hypoxia zone (measuring up to 90 km 2 in summer). Rather, the reconstructed trends in nitrogen loading indicate increased phytoplankton production has likely caused a decline in bottom water oxygen concentrations. Sedimentary biogenic silica (BSi), carbon, nitrogen, and phosphorus concentrations increased concurrently with known or inferred changes in nutrient loadings. There were direct relationships between phytoplankton pigments and BSi, heavier ␦ 34 S with increased carbon loading, and sequestration of P, Al, and Fe as carbon loading increased. The results from the sediment analyses and the results from mixing models using C : N ratios and ␦ 13 C suggest an estuarine system that is responsive to increased carbon loading from the nitrogen-limited phytoplankton community and whose sediments are becoming increasingly anoxic as a result. The present nitrogen loading is about three times above that prior to the 1800s, suggesting that without management intervention the anticipated doubling of the watershed's population from 1990 to 2020 will greatly increase the nitrogen loading to this estuary and will lead to much higher amounts of phytoplankton biomass and accumulation and exacerbate hypoxic conditions.

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“…Although it might be expected that arsenic uptake (and methylation) increases as phosphorus concentrations decrease, this is not always the case. For example, in some studies a high degree of arsenic methylation has been found when phosphorus is not limiting [Froelich et al, 1985;Millward et al, 1996; Pettine et al, 1997], while other work has found no evidence of arsenic methylation, despite an arsenic-phosphorus ratio >1 [Morris et al, 1984;Apte et al, 1986]. It has been suggested [Sanders and Riedel, 1987] that the relative nutrient (phosphorus) affinity of a phytoplankton community influences its ability to discriminate between arsenate and phosphorus.…”

mentioning

confidence: 99%

Meridional distribution of arsenic species in the subantarctic zone of the Southern Ocean, south of Australia

Featherstone¹,

Butler²,

O'Grady³

2001

J. Geophys. Res.

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Abstract. Distribution of the arsenic species total inorganic arsenic [As(V+III)], arsenite [As(III)], monomethyl arsenic (MMA), and dimethyl arsenic (DMA) was studied in the Subantarctic Zone (SAZ) of the Southern Ocean, south of Australia, during the austral autumn (March 1998). As(V) was the dominant arsenic species in both vertical profiles and surface waters along the meridional transect 42ø-55øS, 141ø30'E. It was also the only species observed at depths >600 m. Concentrations of the reduced arsenic species (As(III), MMA, and DMA) were low in these waters compared with other oceanic sites with similar concentrations of chlorophyll a. As(III) concentrations could not be reliably quantified at any sites (<0.04 nM). The greatest conversion of As(V) to "biological" species was found at the surface in the Subtropical Convergence Zone (2.5%) and decreased heading southward to 1% in the Polar Front (PF). While the decline in methyl arsenic concentrations was broadly associated with water temperature and measures of biological production, slightly different trends were found in the SAZ and PF. North of the Subantarctic Front (SAF), methyl arsenic concentrations were well correlated with water temperature, while south of the front, no such relation existed. In addition, the ratio DMA/MMA increased south of the SAF, associated with a change in the microalgal community composition. Low water temperature, phosphatereplete conditions, and low biological productivity in the Southern Ocean all contribute to the concentrations of biologically produced arsenic species in this region being among the lowest reported for oceanic waters.

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Arsenic, barium, germanium, tin, dimethylsulfide and nutrient biogeochemistry in Charlotte Harbor, Florida, a phosphorus-enriched estuary

Cited by 120 publications

References 50 publications

Seasonal changes of arsenic speciation in lake waters in relation to eutrophication

Seasonal changes of arsenic speciation in lake waters in relation to eutrophication

Paleo‐indicators and water quality change in the Charlotte Harbor Estuary (Florida)

Meridional distribution of arsenic species in the subantarctic zone of the Southern Ocean, south of Australia

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