The influence of temperature and pH on trace metal speciation in seawater

Byrne, Robert H.; Kump, Lee R.; Cantrell, Kirk J.

doi:10.1016/0304-4203(88)90062-x

Cited by 331 publications

(200 citation statements)

References 23 publications

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“…In artificial seawater (pH 8.1) Fe solubility decreased from 0.5 nM at 5 • C to 0.03 nM at 25 • C (Liu and Millero, 1999). In contrast, the ratio between the concentrations of inorganic Fe to Fe (III) increased by 1.16-fold for each 1 • C increment (Byrne et al, 1998). Therefore, it is unclear how an increase in temperature will affect Fe bioavailability.…”

Section: Iron (Fe) Limitationmentioning

confidence: 99%

“…In the second scenario (Fig. 4b), climate-induced physical and chemical changes to the SO increase the bioavailability of Fe due to warming (Byrne et al, 1998) and lowered pH (Millero, 2009;Breitbarth et al, 2010;Gledhill et al, 2015) and favour the increase in the prevalence of large diatoms. In addition, the intensification of westerly winds, due to the increasing positive SAM index (Fig.…”

Section: Future Of So Primary Productivity?mentioning

confidence: 99%

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Southern Ocean phytoplankton physiology in a changing climate

Petrou

Kranz

Trimborn

et al. 2016

Journal of Plant Physiology

113

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Please cite this article in press as: Petrou, K., et al., Southern Ocean phytoplankton physiology in a changing climate. J Plant Physiol (2016), http://dx.doi.org/10.1016/j.jplph.2016.05.004 ARTICLE IN PRESS a b s t r a c tThe Southern Ocean (SO) is a major sink for anthropogenic atmospheric carbon dioxide (CO 2 ), potentially harbouring even greater potential for additional sequestration of CO 2 through enhanced phytoplankton productivity. In the SO, primary productivity is primarily driven by bottom up processes (physical and chemical conditions) which are spatially and temporally heterogeneous. Due to a paucity of trace metals (such as iron) and high variability in light, much of the SO is characterised by an ecological paradox of high macronutrient concentrations yet uncharacteristically low chlorophyll concentrations. It is expected that with increased anthropogenic CO 2 emissions and the coincident warming, the major physical and chemical process that govern the SO will alter, influencing the biological capacity and functioning of the ecosystem. This review focuses on the SO primary producers and the bottom up processes that underpin their health and productivity. It looks at the major physico-chemical drivers of change in the SO, and based on current physiological knowledge, explores how these changes will likely manifest in phytoplankton, specifically, what are the physiological changes and floristic shifts that are likely to ensue and how this may translate into changes in the carbon sink capacity, net primary productivity and functionality of the SO.

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Section: Iron (Fe) Limitationmentioning

confidence: 99%

Section: Future Of So Primary Productivity?mentioning

confidence: 99%

Southern Ocean phytoplankton physiology in a changing climate

Petrou

Kranz

Trimborn

et al. 2016

Journal of Plant Physiology

113

View full text Add to dashboard Cite

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“…The formation of chemical complexes depends on temperature (Byrne et al, 1988) and can be accurately calculated if enthalpy values are known for the relevant complexes. However, enthalpy values were not available for many complexes.…”

Section: Speciation Calculationsmentioning

confidence: 99%

“…However, enthalpy values were not available for many complexes. Therefore, bias associated with the absence of temperature correction was estimated for each medium and metal by considering exclusively the most abundant metal complexes for which enthalpy values were available (Martell and Smith, 1974;Byrne et al, 1988;Martell et al, 1993;Stumm and Morgan, 1995). Speciation at 25°C and at the temperature of the bioassay was calculated using HY-DRAQL.…”

Section: Speciation Calculationsmentioning

confidence: 99%

Chemical speciation and toxicity of metals assessed by three bioluminescence‐based assays using marine organisms

Deheyn

Bencheikh-Latmani

Latz

2004

Environmental Toxicology

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ABSTRACT:Metal toxicity is a function of the biology of the target organism and the chemical speciation of the metal. The toxicity of 11 metals was assessed with three cell-based bioassays based on marine organisms: the bacterium Photobacterium phosphoreum of the Microtoxா bioassay, an environmental strain of P. phosphoreum, and photocytes isolated from the brittlestar Ophiopsila californica. Metal speciation was calculated for three commonly used media: NaCl-based Microtoxா bioassay medium, artificial seawater glycerol, and artificial seawater. Decreased bioluminescence was considered a proxy for cell toxicity. In all three assays the elements Cd and Hg exhibited similar speciation as well as similar toxicity profiles. The element Cu was toxic in all three assays despite different metal speciation for the P. phosphoreum bioassay. The element Ag was toxic to both bacterial strains but not to photocytes despite a similar chemical speciation for all three assays. In general, the Microtoxா bioassay was sensitive to all metals (except Pb), whereas the photocytes were the least sensitive to the metals. The heightened response of the Microtoxா bioassay probably resulted from a combination of the limited complexing power of the medium and the greater sensitivity of the bacterial strain.

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“…Because of the lack of reliable stability constants which are necessary to describe the complexation, the speciation between Cl − and CO 3 2− is uncertain (Byrne et al, 1988). Studies of lead (II) chloride complexes have been made using potentiometric (Prasad and Prasad, 1980), solubility (Haight and Peterson, 1965;Rafal'skiy and Masalovich, 1981) and spectrophotometric (Tsai and Cooney, 1976;Byrne, 1981;Byrne and Kester, 1981;Byrne and Young, 1982;Millero and Byrne, 1984;Byrne and Miller, 1984;Seward, 1984) methods.…”

Section: Introductionmentioning

confidence: 99%