Copper-binding ligands in the NE Pacific

Whitby, Hannah; Posacka, Anna M.; Maldonado, María T.; Berg, Constant M.G. van den

doi:10.1016/j.marchem.2018.05.008

Cited by 57 publications

(85 citation statements)

References 100 publications

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“…Further, [L] exceeded [Cu T ] and the [Cu T ] was significantly higher at C3 and the [L] followed that trend, which strongly hints towards an active biological ligand production by local biota to mitigate the toxic effects of elevated Cu 2þ concentrations around C3. This theory is further supported by the mean log(K) value of 12.6 AE 0.6 for sulfide-free samples around Whakaari, because log(K) values in the range of 10-13 are predominantly attributed to marine-derived humic substances or thiols (Whitby et al 2018) produced by bacteria (e.g. Shimotori et al 2009;Romera-Castillo et al 2011), decaying phytoplankton (e.g.…”

Section: Copper Speciationmentioning

confidence: 88%

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A unique temperate rocky coastal hydrothermal vent system (Whakaari–White Island, Bay of Plenty, New Zealand): constraints for ocean acidification studies

Zitoun

Connell

Cornwall

et al. 2020

Mar. Freshwater Res.

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In situ effects of ocean acidification are increasingly studied at submarine CO2 vents. Here we present a preliminary investigation into the water chemistry and biology of cool temperate CO2 vents near Whakaari–White Island, New Zealand. Water samples were collected inside three vent shafts, within vents at a distance of 2m from the shaft and at control sites. Vent samples contained both seawater pH on the total scale (pHT) and carbonate saturation states that were severely reduced, creating conditions as predicted for beyond the year 2100. Vent samples showed lower salinities, higher temperatures and greater nutrient concentrations. Sulfide levels were elevated and mercury levels were at concentrations considered toxic at all vent and control sites, but stable organic and inorganic ligands were present, as deduced from Cu speciation data, potentially mediating harmful effects on local organisms. The biological investigations focused on phytoplankton, zooplankton and macroalgae. Interestingly, we found lower abundances but higher diversity of phytoplankton and zooplankton at sites in the direct vicinity of Whakaari. Follow-up studies will need a combination of methods and approaches to attribute observations to specific drivers. The Whakaari vents represent a unique ecosystem with considerable biogeochemical complexity, which, like many other vent systems globally, require care in their use as a model of ‘future oceans’.

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Section: Copper Speciationmentioning

confidence: 88%

“…Organic ligands generally increase the stability and effective solubility of trace metals in the water column, and thereby decrease the biologically available metal fraction in the surrounding water and the metal toxicity to marine biota (e.g. Laglera and Van den Berg 2009;Bundy et al 2015;Whitby et al 2018).…”

Section: Copper Speciationmentioning

confidence: 99%

A unique temperate rocky coastal hydrothermal vent system (Whakaari–White Island, Bay of Plenty, New Zealand): constraints for ocean acidification studies

Zitoun

Connell

Cornwall

et al. 2020

Mar. Freshwater Res.

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“…At the air-sea interface, aerosol Cu may have shown different characters (Box 2). [102], Chen [105], Wen et al [106], Vance et al [107], Chase et al [98], Sunda [30], Vu and Sohrin [108], Lagerström et al [109], Pinedo-Gonzalez et al [110], Middag et al [111], Posacka et al [95], and Whitby et al [112].…”

Section: Box 1 Residence Time Of Cumentioning

confidence: 99%

“…Seasonal changes of Cu speciation may be partly attributed to the variation of phytoplankton community composition [138,139]. The weaker L 2 ligands (as well as L 3 ligands) may be derived from activated sludge or humus in some coastal areas [140], which contributes to 1%-27% of the total ligand concentration in the northeast Pacific [112]. The conditional stability constants of Cu with humic acid (HA) and fulvic acid (FA) are stronger than Zn, Co, Fe, and Al [141].…”

Section: Copper Speciation In the Seawatermentioning

confidence: 99%

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Impacts of Aerosol Copper on Marine Phytoplankton: A Review

et al. 2019

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Atmospheric deposition brings both nutrients and toxic components to the surface ocean, resulting in important impacts on phytoplankton. Field and lab studies have been done on the iron (Fe) fertilization on marine phytoplankton. However, studies on other trace metals are limited. Both bioassay experiments and field observations have suggested that aerosols with high copper (Cu) concentrations can negatively affect the primary productivity and change phytoplankton community structure. Note that with increasing human activities and global environmental changes (e.g., ocean acidification, warming, deoxygenation, etc.), the input of aerosol Cu could exceed toxicity thresholds at certain times or in some sensitive oceanic regions. Here, we provide a comprehensive review on aerosol Cu and marine phytoplankton studies by summarizing (1) physiological effects and toxicity thresholds of Cu to various phytoplankton taxa, (2) interactions between Cu and other metals and major nutrients, and (3) global distribution of surface seawater Cu and atmospheric Cu. We suggest that studies on aerosols, seawater chemistry, and phytoplankton should be integrated for understanding the impacts of aerosol Cu on marine phytoplankton, and thereafter the air–sea interaction via biogeochemical processes.

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