Behavior of major and minor elements in a temperate river estuary to the coastal sea

Patra, Sivaji; Liu, C. Q.; Wang, F. S.; Li, Siliang; Wang, B. L.

doi:10.1007/s13762-012-0097-8

Cited by 19 publications

(13 citation statements)

References 27 publications

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“…Marine waters have higher Mg and Ca concentrations in comparison to freshwaters (Brown et al, 1989;Bruland and Lohan, 2006), and therefore a decrease in Mg 220 concentration cannot occur at high salinity. A higher Ca concentration at a relatively constant Mg concentration is unlikely because previous studies have shown a mostly conservative behavior of Mg and Ca in estuaries and surrounding areas (Millero, 2006;Patra et al, 2012). Moreover, ostracod Sr/Ca is similar at different salinities, supporting the idea that changes in Mg, Sr and Ca water concentrations are not the main control on Mg/Ca and Sr/Ca ostracod ratios.…”

Section: Control On Mg/ca and Sr/ca Ratios Of S Impressa And N Delimentioning

confidence: 59%

Calibration of Mg / Ca and Sr / Ca in coastal marine ostracods as proxy of temperature

Rodríguez¹,

Not²

2020

Preprint

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Abstract. The Mg / Ca ratio of marine shells has been widely used in temperature paleoreconstructions to understand past marine conditions. Temperature calibrations are known to be species-specific but only available for a few species, despite the large number of known ostracod species. Here, we develop temperature calibrations for two shallow marine ostracods, Sinocytheridea impressa and Neomonoceratina delicata, using modern sediment samples. Our results show that adult specimens of these two species are useful as a paleothermometer. We observed significant correlations using the Mg / Ca ratios of both species to the annual (Mg / CaS. impressa = 3.7•T−62.7, Mg / CaN. delicata = 1.6•T−16.8) and April (Mg / CaS. impressa = 2.7•T−37.2, Mg / CaN. delicata = 1.6•T−15.7) temperatures. The correlation of temperature to the Mg / Ca ratio of S. impressa is more significant, and therefore should be preferred for paleoreconstructions. Re-analysis from satellite data allows us to validate our temperature calibration to an extended area around the Pearl River Estuary. Our results show that Mg / Ca of S. impressa and N. delicata ostracods can be used to reconstruct water temperature at a regional scale, which provides information on the oceanic circulation in coastal areas of the South China Seas. Finally, the Sr / Ca ratios of both species do not correlate with any of the 24 water parameters recorded by the Environmental Protection Department of Hong Kong, including temperature (21.7–24.1 °C), salinity (23.8–33.7 psu), dissolved oxygen (4.3–7.1 mg L−1), suspended solids (1.9–35.4 mg L−1) and pH (7.7–8.2).

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Section: Control On Mg/ca and Sr/ca Ratios Of S Impressa And N Delimentioning

confidence: 59%

Calibration of Mg / Ca and Sr / Ca in coastal marine ostracods as proxy of temperature

Rodríguez¹,

Not²

2020

Preprint

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“…3). Two periods of calcification have recently been shown for C. torosa (Roberts et al, 2020), which may also occur in S. impressa and N. delicata. The high correlation between April water temperature and Mg/Ca ratios indicates the possibility of reconstructing water temperature at a finer temporal scale, which can help to unravel coastal ocean circulation patterns.…”

Section: Temporal Variabilitymentioning

confidence: 92%

“…Marine waters have higher Mg and Ca concentrations in comparison to freshwater (Open University, 1992;Bruland and Lohan, 2006). Previous studies have shown mostly conservative behavior of Mg and Ca in estuaries and surrounding areas (Millero, 2006;Patra et al, 2012), where these concentrations increase linearly with salinity. Therefore, a higher Ca concentration over Mg concentration or a lower Mg concentration over Ca concentration toward more saline waters is unlikely in Hong Kong waters.…”

Section: E/ca Calibrations To Water Parametersmentioning

confidence: 99%

“…A weak control of water temperature and alkalinity on Sr/Ca ratios has also been documented in lacustrine species (De Deckker et al, 1999;Gouramanis and De Deckker, 2010). In spite of this use in lacustrine systems, Sr/Ca of ostracod shells does not seem to be related to salinity or temperature in shallow marine environments (Dettman and Dwyer, 2012;Gouramanis and De Deckker, 2010;Ingram, 1998;Roberts et al, 2020). Here, we develop parametric calibrations for Mg/Ca and Sr/Ca of two geochemically unknown species, Sinocytheridea impressa and Neomonoceratina delicata.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have focused their efforts on the development of calibrations for deep water genera, such as Krithe, which are found in the Pacific, Atlantic and Arctic oceans (Corrège and De Deckker, 1997;Cronin et al, 1996;Dwyer et al, 1995Dwyer et al, , 2002Elmore et al, 2012;Farmer et al, 2011Farmer et al, , 2012Rodriguez et al, 2020). Other studies have investigated species found in shallow marine environments, such as those from the genus Loxoconcha (Cronin et al, 2003(Cronin et al, , 2005a and Cyprideis (Holmes and De Deckker, 2016;Roberts et al, 2020). However, there is uncertainty in temperature calibrations to Mg/Ca of marine ostracods due to the low number of calibrations developed in comparison to the number of known species (Holmes and De Deckker, 2012) and the contrasting cali-bration slopes observed in different species (Yamada et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Calibration of Mg ∕ Ca and Sr ∕ Ca in coastal marine ostracods as a proxy for temperature

Rodríguez¹,

Not

2021

Biogeosciences

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Abstract. The Mg/Ca and Sr/Ca ratios of marine shells have been widely used in environmental paleoreconstructions to understand past marine conditions. Temperature calibrations to ostracod Mg/Ca ratios are known to be species-specific but only available for a few species, despite the large number of known ostracod species. Here, we develop temperature calibrations for two shallow marine ostracods, Sinocytheridea impressa and Neomonoceratina delicata, using modern sediment samples. Our results show that adult specimens of these two species might be useful as a paleothermometer. We observed significant correlations using the Mg/Ca ratios of both species to the annual (Mg/CaS. impressa=3.7 ⋅ T−62.7; Mg/CaN. delicata=1.6 ⋅ T−16.8) and April (Mg/CaS. impressa=2.8 ⋅ T−39.2; Mg/CaN. delicata=1.6 ⋅ T−15.7) temperatures. The correlation of temperature to the Mg/Ca ratio of S. impressa is more significant and therefore should be preferred for paleoreconstructions. Re-analysis from satellite data allows us to validate our temperature calibration to an extended area around the Pearl River estuary. Our results show that Mg/Ca of S. impressa and N. delicata ostracods can be used to reconstruct water temperature at a regional scale, which provides information on the oceanic circulation in coastal areas of the South China Sea. Sr/Ca ratios of both species do not correlate with any of the 24 water parameters recorded by the Environmental Protection Department of Hong Kong, including temperature (21.7–24.1 ∘C), salinity (23.8–33.7 PSU), dissolved oxygen (4.3–7.1 mg L−1), suspended solids (1.9–35.4 mg L−1) and pH (7.7–8.2).

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Effects of water chemistry and surface contact on the toxicity of silver nanoparticles to Bacillus subtilis

Cheng

2017

Ecotoxicology

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The growing use of silver nanoparticles (AgNPs) has created concerns about its potential impacts on natural microbial communities. In this study, the physicochemical properties of AgNPs and its toxicity on natural bacteria Bacillus subtilis (B. subtilis) were investigated in aqueous conditions. The characterization data showed that AgNPs highly aggregated in aqueous conditions, and the hydrodynamic diameter of AgNPs in aqueous conditions was larger than its primary size. The studied AgNPs was less toxic to B. subtilis in estuarine water as compared to that in Milli-Q water and artificial seawater, which might be due to the observed enhanced aggregation of AgNPs in estuarine water. The toxicity of AgNPs to B. subtilis was greatly reduced when their surface contact was blocked by a dialysis membrane. Scanning electron microscope images showed that exposure contact to AgNPs resulted in damage of the microbial cell wall and enhanced formation of fibrillar structures. These results suggest that particle-cell contact is largely responsible for the observed toxicity of AgNPs in B. subtilis. This study can help to understand the potential impacts of AgNPs to natural microbes, especially in the complex aquatic environments.

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Behavior of major and minor elements in a temperate river estuary to the coastal sea

Cited by 19 publications

References 27 publications

Calibration of Mg / Ca and Sr / Ca in coastal marine ostracods as proxy of temperature

Calibration of Mg / Ca and Sr / Ca in coastal marine ostracods as proxy of temperature

Calibration of Mg ∕ Ca and Sr ∕ Ca in coastal marine ostracods as a proxy for temperature

Effects of water chemistry and surface contact on the toxicity of silver nanoparticles to Bacillus subtilis

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