Seasonal variation of selected metals in sediments, water and tissues of the groovy mullet, Liza dumerelii (Mugilidae) from the Mhlathuze Estuary, South Africa

Mzimela, Hendrick Mduduzi; Wepener, Victor; Cyrus, D. P.

doi:10.1016/s0025-326x(03)00088-2

Cited by 65 publications

(22 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This fact, in addition with the results here presented sustained the occurrence of a source of Cr within the studied area of Bahía Blanca estuary. Dissolved Cr levels were compared with those reported for different estuaries: Mirlean et al (2001) at Patos Lagoon, in Brazil (0.02-2.84 lg L -1 ); Mzimela et al (2003) at Richards Bay and Mhlathuze estuary, in South Africa (14-226 lg L -1 ); or, Jayaprakash et al (2005) at Ennore Creek, in Chenai (India) (0.1-3.8 lg L -1 ). Cr data could be compared with ecotoxicological framework, thus data on 96 h, Cr LC 50 (0.5-1.0 mg L -1 ) for the grass shrimp (Palaemonetes pugio) reported as responsible of sublethal effects on this species (Doughtie and Ranga Rao 1984); or, those for grass shrimp, P. pugio, (3.60-14.50 mg L -1 ) and for sheepshead minnows, Cyprinodon variegatus, (63-1,000 mg L -1 ) reported as lethal effects by Conklin et al (1983).…”

Section: Resultsmentioning

confidence: 99%

Dissolved Heavy Metal (Cd, Pb, Cr, Ni) Concentrations in Surface Water and Porewater from Bahía Blanca Estuary Tidal Flats

Botté

Freije

Marcovecchio

2007

Bull Environ Contam Toxicol

View full text Add to dashboard Cite

The concentrations of dissolved cadmium, lead, chromium and níquel were determined in surface water column and pore water, collected from the extensive tidal plain at Bahía Blanca estuary, Argentina. Three different polluted areas were selected to study the spatial variation of these metals. The concentration ranges within the water column were slightly variable (Cd: 0.18-2.48 microg L(-1); Pb: 0.38-7.53 microg L(-1); Cr: 0.89-5.83 microg L(-1); Ni: 0.81-3.49 microg L(-1)), and displayed a clear gradient respect to the industrial area. Significant differences (contrast tests) between sites were detected for Cd, Pb and Ni. Very similar concentrations of Cd (0.18-3.41 microg L(-1)), Pb (0.38-5.83 microg L(-1)), Cr (0.89-9.37 microg L(-1)), Ni (0.81-6.56 microg L(-1)) were found in the porewater at all sites. The results suggested that both environmental compartments (water column and tidal flats porewater) may be affected by similar point and non-point heavy metal sources.

show abstract

Section: Resultsmentioning

confidence: 99%

Dissolved Heavy Metal (Cd, Pb, Cr, Ni) Concentrations in Surface Water and Porewater from Bahía Blanca Estuary Tidal Flats

Botté

Freije

Marcovecchio

2007

Bull Environ Contam Toxicol

View full text Add to dashboard Cite

show abstract

“…Many marine organisms spend a major portion of their life cycles living in or on aquatic sediments, hence the tendency for these contaminants to be consumed by higher aquatic life and humans (Calmano et al 1996). Seafoods accumulate most of the trace elements to concentrations that are many times higher than those found in seawater (Ayejuyo et al 2003;Mzimela et al 2003;O'Connor et al 1998;Wright 1995). Worst still, metals are not rapidly removed from the environment nor are they readily detoxified or degraded by metabolic activities of the organisms taking them up resulting in accumulation.…”

Section: Introductionmentioning

confidence: 99%

Sediment load and bioconcentration of heavy metals by shrimp (Peaneus notalis) from Epe Lagoon, Nigeria

Olusegun

Olalekan

Oladipo

2009

Environ Monit Assess

View full text Add to dashboard Cite

In many developing countries, surface waters, especially rivers and lagoons, have become deposition sites for all sorts of wastes. Three sampling sites located trigonally on Epe lagoon, Lagos, Nigeria were identified, and water, sediment, and commonly farmed shrimp, Peaneus notalis, were sampled and assessed for heavy metal concentrations. Zn, Pb, Ni, Cu, Cr, Cd, and Mn were determined in the aqua regia digests of the samples by means of Perkin Elmer AAnalyst 200 atomic absorption spectrophotometer. Heavy metals occurred above detection limits at all sites. The highest load of these trace elements was found in sediment samples followed by the water samples. The levels observed in the shrimp samples, however, were much lower than WHO levels. In the distribution, zinc was the highest metal found in the samples ranging from 17.94 +/- 2.60 mg/L in water to 37.85 +/- 9.35 microg/g in sediments. The least was Cd 0.03 +/- 0.01 mg/L in water and 0.28 +/- 0.04 microg/g in sediments. Lead was the most widely varied metal in shrimp with a 84.38% coefficient of variation. Apart from Cr, the metals appeared to be fairly and evenly distributed in the sediment, with coefficient of variation ranging from 14.29% (Cd) to 24.76% (Mn) The variations were between 14.49% (Zn) and 66.67% (Cr) in the water samples. The paired t test carried out between water and sediment, water and shrimp, and shrimp and sediment was significant at p = 0.05. Three-factor analysis of variance did not reveal any significant difference in metal burdens among the trigonally located sites under investigation. Shrimp samples showed evidence of bioaccumulation but are still below internationally established levels.

show abstract

“…Among aquatic organisms, fish cannot escape the detrimental effects of these pollutants, and are therefore generally considered to be the most relevant organisms for pollution monitoring in aquatic ecosystems (van der Oost et al, 2003). During all contamination processes in fish, heavy metals cross biological barriers; the gill epithelium and skin for direct route, and the wall of digestive tract for indirect route (Mzimela et al, 2003) and accumulate mainly in metabolically active tissues, such as the kidney, liver and gills.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant responses and metal accumulation in tissues of Nile tilapia Oreochromis niloticus under Zn, Cd and Zn + Cd exposures

Fırat

Çoğun

Aslanyavrusu

et al. 2008

J of Applied Toxicology

View full text Add to dashboard Cite

We investigated the effects of Zn, Cd and a Zn + Cd mixture on antioxidant parameters and metal accumulation in Oreochromis niloticus. Fish were exposed to 0.5 and 5.0 mg l(-1) Zn, 0.1 and 1.0 mg l(-1) Cd, and 0.5 mg l(-1) Zn + 0.1 mg l(-1) Cd and 5.0 mg l(-1) Zn + 1.0 mg l(-1) Cd mixtures for 7 and 28 days to determine Zn and Cd accumulation, reduced glutathione (GSH) level and glucose-6-phosphate dehydrogenase (G6PD) activity in gill and liver. There was increasing accumulation of the metals in the tissues with increasing concentrations of metals in the exposure medium and with increasing duration of exposure (except at the lower concentration of Zn). Concentration of metals in the tissues of fish exposed to the Zn + Cd combination were significantly lower than in fish exposed to the single metal. The highest metal accumulation was observed in the liver. Exposure to the heavy metals affected the antioxidant parameters in the tissues, with both GSH level and G6PD activity in the gill and liver being increased under Zn, Cd and Zn + Cd exposures, especially in their higher concentrations. These increases in the antioxidant responses were higher with the Cd alone, and in combination with Zn, than with Zn alone. Furthermore, GSH level and G6PD activity increased with increasing exposure period only for Cd alone, and in Cd combination with Zn. The results indicate that O. niloticus resisted oxidative stress induced by heavy metal exposure by antioxidant mechanisms.

show abstract

Seasonal variation of selected metals in sediments, water and tissues of the groovy mullet, Liza dumerelii (Mugilidae) from the Mhlathuze Estuary, South Africa

Cited by 65 publications

References 12 publications

Dissolved Heavy Metal (Cd, Pb, Cr, Ni) Concentrations in Surface Water and Porewater from Bahía Blanca Estuary Tidal Flats

Dissolved Heavy Metal (Cd, Pb, Cr, Ni) Concentrations in Surface Water and Porewater from Bahía Blanca Estuary Tidal Flats

Sediment load and bioconcentration of heavy metals by shrimp (Peaneus notalis) from Epe Lagoon, Nigeria

Antioxidant responses and metal accumulation in tissues of Nile tilapia Oreochromis niloticus under Zn, Cd and Zn + Cd exposures

Contact Info

Product

Resources

About