Metals in sediments and mangrove oysters (Crassostrea rhizophorae) from the Caroni Swamp, Trinidad

Kanhai, La Daana K.; Gobin, Judith; Beckles, Denise M.; Lauckner, Bruce; Mohammed, Azad

doi:10.1007/s10661-013-3510-y

Cited by 23 publications

(10 citation statements)

References 44 publications

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“…Several anthropogenic sources, however, such as agriculture, aquaculture, and mining increase metal burdens exceeding natural levels. Since bivalves accumulate and exhibit efficient strategies to deal with the potential toxic effect of metals (Arifin & Bendell-Young, 1997), they are used as biomarkers for monitoring metal contamination in aquatic systems (Kanthai et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Heavy-metal contents in oysters (Crassostrea gigas) cultivated on the southeastern coast of the Gulf of California, Mexico

García-Ulloa¹

2017

Hidrobiológica

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Heavy-metal contents in oysters (Crassostrea gigas) cultivated on the southeastern coast of the Gulf of California, Mexico Contenido de metales pesados en ostiones (Crassostrea gigas) cultivados en la costa sureste del Golfo de California, México ABSTRACT Background. For its flesh and flavor, the Pacific oyster Crassostrea gigas is cultivated worldwide, but as filter feeders, this bivalve bioaccumulates heavy metals from different pollution sources, rendering them unsafe for human consumption. Goals. We carried out this study to assess the heavy metal concentrations in cultivated oysters from a farm located on the southeastern coast of the Gulf of California during 2011. Methods. Oyster samples were analyzed monthly (March-December 2011) for cooper (Cu), cadmium (Cd), chromium (Cr), nickel (Ni), lead (Pb), zinc (Zn), arsenic (As), and mercury (Hg). Results. The mean values (µg g -1 , dry weight) for each metal were Cu = 51.42 ± 25.92, Cr = 24.97 ± 32.38, Cd = 13.84 ± 4.22, Ni = 10.26 ± 12.18, Pb = 2.18 ± 1.28, As = 0.37 ± 0.08, Zn = 267.42 ± 92.29, and Hg = 0.02 ± 0.01. Conclusions. The results suggest that metal burdens could be influenced by anthropogenic activities such as agriculture and aquaculture surrounding the culture zone. Cu, Cr, Cd, and Pb levels (µg g -1 , fresh weight) were above the maximum permissible values and thus pose a threat to human health. Metal concentrations must be monitored periodically. RESUMENAntecedentes. El ostión del pacífico, Crassostrea gigas, es cultivado en el mundo por su sabor y textura de la carne, pero por ser un organismo que se alimenta mediante filtración, puede acumular metales pesados haciéndolo peligroso para su consumo. Objetivos. El presente estudio evaluó la concentración de metales pesados en ostiones cultivados en una granja localizada en la costa sureste del Golfo de California durante 2011. Métodos. Se tomaron muestras de ostión cada mes (marzo-diciembre 2011) para analizar el contenido de cobre (Cu), cadmio (Cd), cromo (Cr), níquel (Ni), plomo (Pb), zinc (Zn), arsénico (As) y mercurio (Hg). Resultados. Los valores promedio (µg g -1 , peso seco) de cada metal fueron: Cu = 51.42 ± 25.92, Cr = 24.97 ± 32.38, Cd = 13.84 ± 4.22, Ni = 10.26 ± 12.18, Pb = 2.18 ± 1.57, As = 0.37 ± 0.26, Zn = 267.42 ± 92.29 and Hg = 0.02 ± 0.01. Conclusiones. Los resultados obtenidos sugieren que la carga de metales pudo haber sido influenciada por actividades antropogénicas desarrolladas en los alrededores del área de cultivo, como agricultura y acuacultura. Los niveles de Cu, Cr, Cd y Pb en peso húmedo rebasaron los límites máximos permitidos representando un riesgo para la salud humana. La carga de los metales estudiados debe ser monitoreada periódicamente.

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Section: Introductionmentioning

confidence: 99%

Heavy-metal contents in oysters (Crassostrea gigas) cultivated on the southeastern coast of the Gulf of California, Mexico

García-Ulloa¹

2017

Hidrobiológica

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“…The literature emphasizes the abiotic importance through local hydrodynamics, the chemical form of pollutants, the presence of other substrates competing for binding sites, and the physicochemical composition of the adjacent medium 27,61,62 , whereas the biotic ones include the life-cycle stage, gender, specific genetics, and physiological conditions [63][64][65][66] . In this study, we found that the variations appear predominantly as a combined effect of the biomonitors' proximity to the source of pollution, seasonal and hydrodynamic variation, and prior exposure of the biomonitor to metal-contaminated environments.…”

Section: Resultsmentioning

confidence: 99%

Heavy metals bioconcentration in Crassostrea rhizophorae: A site-to-site transplant experiment at the Potengi estuary, Rio Grande do Norte, Brazil

Mello

Crapez

Silva

et al. 2020

Sci Rep

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in this study, we analyzed the bioconcentration of cd, cr, cu, pb, ni, and Zn in the soft tissue of transplanted oysters in two sites in the potengi estuary for six months. native oysters collected before and after the transplantation experiment provided the background for statistical analyses. cd, cr, and ni showed a strong inverse correlation with oyster weight in both sites. transplantation upstream of the estuary presented increasing concentrations of Zn, cu, and pb and condition index (ci) and decreasing trends for Cd and Ni, whereas Cr oscillated significantly. In the downstream transplantation, cu, pb, and Zn and the ci tended to decrease, whereas for ni, cd, and cr, the concentrations increased. Spatiotemporal principal component analysis correlated these results mainly with proximity to the polluting source, seasonality, and previous exposure to heavy metals. these results helped interpret the responses provided by these biomonitors to environmental changes, whether they are natural or anthropogenic.Industrialization and urbanization are primary sources of heavy-metal contamination in estuaries and coastal ecosystems of tropical and subtropical countries (e.g., Brazil) 1,2 . Deforestation of estuarine margins also impairs the ability of the environment to withstand heavy-metal pollution, as mangrove forests are an important agent in the process of cycling organic matter and nutrients, acting as a "filter" by retaining and detoxifying harmful elements and substances 3-5 . It is a fact that metal pollution in aquatic systems will significantly increase in the future owing to the popularity of new technologies, such as nanotechnology, and the improper disposal of the so-called e-waste 6 .Metals widely available in estuarine environments tend to be trapped in sediments and incorporated into the local food chain. Thus, the presence of heavy metals in sediments can induce toxic effects in living organisms when they exceed certain concentration limits 5 . These limits, according to Farrington et al. 2 , are dependent on the half-life of the metal itself (or the metallic compound) and its nature (whether essential or nonessential) and on the tolerance of the organism to the environment it is exposed to. Once discarded in an estuarine system, heavy metals can undergo various processes, such as dissolution, precipitation, adsorption, and complexation (with organic and inorganic dissolved ligands and particulate matter), and become deposited in bottom sediments 7 . These processes can create a potential source of pollution and adversely affect the environmental quality 8,9 . Certain marine organisms, such as barnacles and bivalve mollusks, can metabolically accumulate large amounts of these metals in their tissues, having efficient strategies to tolerate toxicity and reduce damage in such a way that they can be employed in multipurpose environmental monitoring and several levels of environmental degradation, thus signifying the extent of pollution present in the adjacent water column 10,11 .Bioaccumulation of he...

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“…The gently sloping foothills of the northern and central ranges and the nonflood prone areas of the Caroni floodplain are used extensively for built development, both industrial and residential. At present, there are also a number of agricultural ventures that exist in the area (Kanhai, Gobin, Beckles, Lauckner, & Mohammed, 2013). These ventures contribute to the chemical contamination of the Caroni Swamp through runoff into the rivers.…”

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confidence: 99%

“…Common land-based sources may include surface runoff from roadways as well as riverine inputs, while marinebased sources may include discharges from maritime vessels operating in adjacent waters as well as tidal deposition of mainland contaminants. In addition, it must be highlighted that the operation of boats (for ecotourism and fish/shellfish harvesting) within the boundaries of the swamp may also contribute to chemical contamination in the swamp (Siung-Chang, Norman, & Dalipsingh, 1987;Kanhai et al, 2013). The Caroni Swamp is therefore susceptible to different sources of pollution, both land-based and marine-based, and from within its boundaries (Kanhai et al, 2013).…”

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confidence: 99%

“…In addition, it must be highlighted that the operation of boats (for ecotourism and fish/shellfish harvesting) within the boundaries of the swamp may also contribute to chemical contamination in the swamp (Siung-Chang, Norman, & Dalipsingh, 1987;Kanhai et al, 2013). The Caroni Swamp is therefore susceptible to different sources of pollution, both land-based and marine-based, and from within its boundaries (Kanhai et al, 2013). While there have been many ecological assessments of this wetland (Bacon, 1970;Cuffy, 1999;Juman & Hassanali, 2013), information on the macrobenthic fauna is limited.…”

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confidence: 99%

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The effect of seasonal and human pressure on macrobenthic fauna in the Caroni Swamp Ramsar Site, Trinidad and Tobago

Kanhai¹,

Juman²

2018

RBT

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Human pressures have placed many tropical estuaries in developing countries under increased levels of stress. The Caroni Swamp Ramsar Site, the largest mangrove swamp along the west coast of Trinidad, has been subjected to high levels of anthropogenic impacts including hydrological alteration and pollution from land-based sources since the 1920’s. While most of these impacts have been well documented, limited information exists on the macrobenthic communities in the swamp. This study addresses the paucity of information. The macrobenthic fauna in the main waterways of Caroni Swamp was sampled at 12 locations using a Van Veen 0.025m2 grab, once in the dry (April) and wet (August) season of 2015 with a total of 144 samples. The samples were sorted, counted and species were identified to the lowest possible taxonomic level. A total of 55 taxa were identified with polychaetes being the most abundant taxa. The ecological status of the macrobenthos was assessed using AZTI’s Marine Biotic Index (AMBI) and the multivariate-AMBI (M-AMBI). Physicochemical parameters were measured with a YSI multiparameter metre. Chemical analyses were also conducted on nitrates, nitrites, ammonia and reactive phosphates using standard methods. Overall, AMBI characterised the Caroni Swamp as “slightly disturbed” with a macrobenthic community of “poor” ecological status according to M-AMBI. Generally, the quality of the environment improves from the dry season to the wet season. However, seasonal variations in AMBI and M-AMBI were found to be site specific as some showed improvement in ecological status and macrozoobenthos quality while others showed degradation from the dry season to the wet season. The stations to the north of the swamp showed improvement from the dry season to the wet season while the opposite was observed in the more southern stations. One notable characteristic of the swamp was the high levels of pollutants, particularly ammonia, recorded in one of its major waterways, the Caroni River. This is in contrast to the other waterways within the swamp which experience much lower levels of pollutant input from land-based sources. The assessment of the Caroni Swamp using AMBI and M-AMBI may be useful for informing management strategies to conserve the wetland and improve environmental quality.

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Metals in sediments and mangrove oysters (Crassostrea rhizophorae) from the Caroni Swamp, Trinidad

Cited by 23 publications

References 44 publications

Heavy-metal contents in oysters (Crassostrea gigas) cultivated on the southeastern coast of the Gulf of California, Mexico

Heavy-metal contents in oysters (Crassostrea gigas) cultivated on the southeastern coast of the Gulf of California, Mexico

Heavy metals bioconcentration in Crassostrea rhizophorae: A site-to-site transplant experiment at the Potengi estuary, Rio Grande do Norte, Brazil

The effect of seasonal and human pressure on macrobenthic fauna in the Caroni Swamp Ramsar Site, Trinidad and Tobago

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