Distribution and enrichment of trace metals in marine sediments from the Eastern Equatorial Atlantic, off the Coast of Ghana in the Gulf of Guinea

Mahu, Edem; Nyarko, Elvis; Hulme, S.; Coale, Kenneth H.

doi:10.1016/j.marpolbul.2015.06.044

Cited by 45 publications

(14 citation statements)

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“…Trace metals are of environmental concern because they persist in the environment, incorporate into the food web, and can pose adverse effects to wildlife and humans (Bonanno and Giudice 2010;Zheng et al 2010;Du et al 2013;Qiu 2015). Sediments are an important sink for trace metals (Kouassi et al 2015;Mahu et al 2015;Zhang et al 2016). They are considered as appropriate indicators of metal pollution in aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

et al. 2018

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Purpose Trace metals accumulate in the food web and can pose high risks to human health and aquatic biota. We investigated seasonal and spatial variations of Cu, Zn, Pb, Co, and Ni mobility in surface sediments (0-5 cm) and their potential toxicity. Materials and methods The sampling was carried out in three embayments of the Ebrie Lagoon (Côte d'Ivoire) during the rainy and dry seasons. The sequential and kinetic extraction methods were used to assess Cu, Zn, Pb, Co, and Ni mobility and their potential toxicity. Analysis of variance (ANOVA) was performed to ascertain spatial and seasonal differences. Results and discussion The results showed that contrarily to Co, distribution patterns of Zn and Cu in the sediment fractions showed no spatial and seasonal variability. On the other hand, Pb and Ni distribution patterns varied highly across the bays but not seasonally. Nevertheless, repeated measurements over a long period of time should be carried out to better understand the seasonal variability of metal distribution in sediment phases. Cu, Pb, Co, and Ni were abundant in residual fraction (56.93-71.66%) in the bays. On the contrary, a very high portion of Zn (up to 70%) could be remobilized. Cu, Pb, Co, and Ni formed mainly inert complexes in sediments, while Zn formed labile complexes. Zn could pose high risk to biota, Co and Ni a medium risk, and Cu and Pb a low risk. Conclusions A combination of both sequential and kinetic methods revealed that both Zn and Pb formed labile complexes in the exchangeable and iron/manganese oxide fractions. Sequential extraction showed high Pb concentrations in the iron/manganese oxides. Thus, Zn and Pb may be highly available, which confirmed fish Pb concentrations exceeding WHO safe limits found by previous studies. Therefore, potential mobility of metals could be better assessed by the exchangeable and iron/manganese oxide fractions obtained by sequential extraction methods.

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Section: Introductionmentioning

confidence: 99%

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

et al. 2018

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“…Besides having an important economic value, bivalves have been well established as biomonitoring organisms to assess metal pollution due to their capability to accumulate metals within their tissues [7]. The use of bivalves as bioindicators for monitoring the concentration of heavy metals has been conducted in many areas in the world [8][9][10][11][12][13][14][15][16]. Due to their widespread distribution, cockles therefore can be used as biomonitoring organism for comparative study.…”

Section: Introductionmentioning

confidence: 99%

Concentrations of Metals in Tissues of Cockle Anadara granosa (Linnaeus, 1758) from East Java Coast, Indonesia, and Potential Risks to Human Health

Soegianto

Putranto

Lutfi

et al. 2020

International Journal of Food Science

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This study reports the presence of Cd, Pb, Zn, Hg, Cu, and Cr in the cockles (Anadara granosa, Linnaeus, 1758) harvested along the East Java Coast, Indonesia. The concentrations of metals were determined by atomic absorption spectrometer and expressed in mg kg -1 wet weight. The concentrations of metals ranged from 0.11 to 0.82 mg kg −1 for Cd, 0.10 to 0.54 mg kg −1 for Pb, 10.22 to 19.04 mg kg −1 for Zn, 0.02 to 1.47 mg kg −1 for Hg, 1.79 to 4.76 mg kg −1 for Cu, and 1.64 to 3.79 mg kg −1 for Cr. The metal concentrations in the whole tissues of cockles were in the order Zn>Cu>Cr>Hg>Cd>Pb. The Cd and Pb levels in cockles were found to be higher than the permissible limit for human consumption according to EC and FAO; the levels of Hg exceeded the EC, Hong Kong, Australia, and Indonesia standards; and the levels of Cr exceeded the Hong Kong standard. The estimated weekly intake (EWI) of cockles indicates that the concentrations of Cd and Hg in the cockle tissues from Gresik were higher than the provisional tolerable weekly intake (PTWI); meanwhile, the concentrations of Cr of cockles from all locations were higher than and close to the PTWI. The THQ values for Cd at Gresik, for Hg at Gresik, Surabaya, and Pasuruan, and for Cr at all locations were higher than one indicating that these metals pose potential noncarcinogenic effects to consumers. Reducing the consumption of cockles should be done in order to minimize the adverse effects of metals especially Cd, Hg, and Cr to human health.

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“…Because of this, research on sea turtles has been largely restricted to nesting females, which has led to conservation efforts primarily focused on nesting beaches, rather than in-water habitat. Since in water habitats come with a variety of unique threats, including resource mining, fishing, and anthropogenic pollution, understanding oceanic habitat use and migration patterns is imperative to designing effective marine conservation strategies [4][5],[6],[7]. For example, endangered leatherback turtle populations in South Africa as well as Gabon have been unable to recover without in-water habitat protection, despite protection at nesting beaches, in part because of intensive long-line fishery operations off the coast of both countries with high rates of turtle bycatch [8],[9].…”

Section: Introductionmentioning

confidence: 99%

“…In West Africa, the Gulf of Guinea has experienced an increase in anthropogenic disturbances, putting the turtle population at risk from many threats including ship traffic, pollution, commercial and small-scale fishing operations [33], [5], and oil and gas development [7], [34]. Marine and coastal pollution in the waters of the Gulf of Guinea has caused a host of environmental threats, including oxygen depletion, faunal die-offs, and heavy metal and hydrocarbon accumulation in marine consumers [6], [35].…”

Section: Introductionmentioning

confidence: 99%

Newly Discovered migratory corridor and foraging ground for Atlantic green turtles, Chelonia mydas, nesting on Bioko Island, Equatorial Guinea

Mettler

Clyde-Brockway

Paladino

et al. 2019

Preprint

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This study is the first to use satellite telemetry to track post-nesting movements of endangered green turtles (Chelonia mydas) in the Gulf of Guinea. Satellite transmitters were attached in 2018 to six Atlantic green turtles nesting on Bioko Island, Equatorial Guinea, to track their post-nesting movements and locate their foraging grounds. Track lengths of 20-198 days were analyzed, for a total of 536 movement days for the six turtles. Migratory pathways and foraging grounds were identified by applying a switching state space model to locational data, which provides daily position estimates to identify shifts between migrating and foraging behavior. Turtles exhibited a combination of coastal and oceanic migrations pathways that ranged from 957 km to 1,131 km. Of the six turtles, five completed their migration and maintained residency at the same foraging ground near the coastal waters of Accra, Ghana until transmission was lost. These five resident turtles inhabit heavily fished and polluted waters and are vulnerable to a variety of anthropogenic threats. The identification of these foraging grounds highlights the importance of these coastal waters for the protection of the endangered Atlantic green turtle.

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Distribution and enrichment of trace metals in marine sediments from the Eastern Equatorial Atlantic, off the Coast of Ghana in the Gulf of Guinea

Cited by 45 publications

References 9 publications

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

Concentrations of Metals in Tissues of Cockle Anadara granosa (Linnaeus, 1758) from East Java Coast, Indonesia, and Potential Risks to Human Health

Newly Discovered migratory corridor and foraging ground for Atlantic green turtles, Chelonia mydas, nesting on Bioko Island, Equatorial Guinea

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