Strong copper complexation in an organic-rich estuary: the importance of allochthonous dissolved organic matter

Shank, Gregory; Skrabal, Stephen A.; Whitehead, Robert F.; Kieber, Robert J.

doi:10.1016/j.marchem.2004.03.001

Cited by 88 publications

(72 citation statements)

References 48 publications

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“…Similar results have been reported for the adjacent Adriatic Sea (Zago et al, 2002) and the eastern coast of USA (Shank et al, 2004a). For example, in Cape Fear River, strong Cu-complexing ligands concentrations ranging from 7 to >200 nM were also found in excess of dissolved Cu concentrations (3 -25 nM; Shank et al, 2004a). These results suggests that the ecological importance of the CuCC may go beyond Cu, since the excess of ligands detected with Cu ++ does not necessarily mean that the organic ligands are specific to Cu but may also bind other trace metals.…”

Section: Relationship Between Cu T and Cuccsupporting

confidence: 89%

“…However, in the Venice Lagoon, the CuCC:Cu T molar ratio was much higher, 55:1 on average, indicating that a large excess complexation capacity exists and because of this excess of CuCC, almost all Cu is likely to be organically complexed. Similar results have been reported for the adjacent Adriatic Sea (Zago et al, 2002) and the eastern coast of USA (Shank et al, 2004a). For example, in Cape Fear River, strong Cu-complexing ligands concentrations ranging from 7 to >200 nM were also found in excess of dissolved Cu concentrations (3 -25 nM; Shank et al, 2004a).…”

Section: Relationship Between Cu T and Cuccsupporting

confidence: 80%

“…Our results are consistent with other studies, which have also shown a positive relationship between Cu complexation and bulk organic matter concentrations (Gerringa et al, 1998;Shank et al, 2004a, b). For instance, in the organic-rich Cape Fear estuary (USA), DOC and ligand concentrations exhibited strong linear correlations (r 2 = 0.93, p<0.01) among transect samples at DOC concentrations <1000 µM and among all size fractions of ultrafiltered estuarine samples (r 2 = 0.94; Shank et al, 2004a). Similarly, Tang et al (2001) have demonstrated the importance of colloidal ligands in the organic complexation of Cu in brackish waters of Galveston Bay (USA) and Zirino et al (1998a) reached the same conclusions in San Diego Bay.…”

Section: Relationship Between Doc and Cuccmentioning

confidence: 99%

See 2 more Smart Citations

Copper complexation capacity in surface waters of the Venice Lagoon

Delgadillo‐Hinojosa

Zirino

Nasci³

2008

Marine Environmental Research

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Section: Relationship Between Cu T and Cuccsupporting

confidence: 89%

Section: Relationship Between Cu T and Cuccsupporting

confidence: 80%

Section: Relationship Between Doc and Cuccmentioning

confidence: 99%

See 1 more Smart Citation

Copper complexation capacity in surface waters of the Venice Lagoon

Delgadillo‐Hinojosa

Zirino

Nasci³

2008

Marine Environmental Research

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“…Therefore, the negative effect on phytoplankton does not depend on the total Cu concentration but rather on the concentrations of the biologically available forms (7,22). The latter are controlled primarily by Cu-binding organic ligands, which include phytoplankton cell exudates and dissolved organic matter (22,23). Consequently, the speciation of Cu is not straightforward.…”

Section: Resultsmentioning

confidence: 99%

Copper aerosols inhibit phytoplankton growth in the Mediterranean Sea

Jordi

Basterretxea

Tovar-Sánchez

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

125

103

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Aerosol deposition plays an important role in climate and biogeochemical cycles by supplying nutrients to the open ocean, in turn stimulating ocean productivity and carbon sequestration. Aerosol particles also contain elements such as copper (Cu) that are essential in trace amounts for phytoplankton physiology but that can be toxic at high concentrations. Although the toxicity of Cu associated with aerosols has been demonstrated in bioassay experiments, extrapolation of these laboratory results to natural conditions is not straightforward. This study provides observational evidence of the negative effect of aerosols containing high Cu concentrations on marine phytoplankton over a vast region of the western Mediterranean Sea. Direct aerosol measurements were combined with satellite observations, resulting in the detection of significant declines in phytoplankton biomass after atmospheric aerosol events characterized by high Cu concentrations. The declines were more evident during summer, when nanoflagellates predominate in the phytoplankton population and stratification and oligotrophic conditions prevail in the study region. Together with previous findings concerning atmospheric Cu deposition, these results demonstrate that the toxicity of Cu-rich aerosols can involve large areas of the world's oceans. Moreover, they highlight the present vulnerability of oceanic ecosystems to Cu-rich aerosols of anthropogenic origins. Because anthropogenic emissions are increasing, large-scale negative effects on marine ecosystems can be anticipated.atmospheric dust | trace metal

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“…Changes in production or transport of DOC will modify the mobility, toxicity, speciation and bioavailability of elements such as mercury (Ravichandran, 2004), silica (e.g. Klaminder et al, 2011a), copper (Brooks et al, 2007;Shank et al, 2004), lead (Klaminder et al, 2006) and cesium (Tegen and Dorr, 1996) as well as persistent organic pollutants (e.g. Bergknut et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Long-term patterns in dissolved organic carbon, major elements and trace metals in boreal headwater catchments: trends, mechanisms and heterogeneity

Oni

Bishop

et al. 2013

Biogeosciences

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The boreal landscape is a complex, spatio-temporally varying mosaic of forest and mire landscape elements that control surface water hydrology and chemistry. Here, we assess long-term water quality time series from three nested headwater streams draining upland forest (C2), peat/mire (C4) and mixed (C7) (forest and mire) catchments. Acid deposition in this region is low and is further declining. Temporal trends in weather and runoff (1981–2008), dissolved organic carbon concentration [DOC] (1993–2010) and other water quality parameters (1987–2011) were assessed. There was no significant annual trend in precipitation or runoff. However, runoff increased in March and declined in May. This suggested an earlier snowmelt regime in recent years. Significant monotonic increasing trends in air temperature and length of growing season suggested a decrease in snowfall and less spring runoff. Stream [DOC] was positively correlated with some trace metals (copper, iron and zinc) and negatively with several other chemical parameters (e.g. sulfate, conductivity, calcium). Both sulfate and conductivity showed declining trends, while a significant increase was observed in pH during winter and spring. Calcium and magnesium showed monotonic decreasing trends. The declining trajectories of stream base cation and sulfate concentrations during other times of the year were not accompanied by changes in pH and alkalinity. These results indicate subtle effects of recovery from acidification. Water temperature increased significantly both annually and in most months. A simultaneous monotonic increase in iron (Fe) and [DOC] in autumn suggests co-transport of Fe-DOC in the form of organometallic complexes. A monotonic increase in UV absorbance in most months without co-occurring changes in DOC trend suggests a shift in DOC quality to a more humic-rich type. The observed increase in soil solution [DOC] and subtle trends in stream [DOC] suggest that climate rather than recovery from acidification is the dominant driver of DOC trends in the Svartberget catchment

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Strong copper complexation in an organic-rich estuary: the importance of allochthonous dissolved organic matter

Cited by 88 publications

References 48 publications

Copper complexation capacity in surface waters of the Venice Lagoon

Copper complexation capacity in surface waters of the Venice Lagoon

Copper aerosols inhibit phytoplankton growth in the Mediterranean Sea

Long-term patterns in dissolved organic carbon, major elements and trace metals in boreal headwater catchments: trends, mechanisms and heterogeneity

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