Concentrations of zinc, manganese, copper, cadmium, magnesium and iron in ten species of algae and sea water from Aqaba, Jordan

Wahbeh, Mohammad I.; Mahasneh, Dureid M; Mahasneh, I. A.

doi:10.1016/0141-1136(85)90011-x

Cited by 29 publications

(15 citation statements)

References 14 publications

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“…U. lactuca was used successfully in a comparative study of four sites in Hong Kong waters (Wong et al, 1982), and in a study on heavy metals it was found to be a good metal accumulator (BFC values of 810 for Cr, 540 for Ni and 280 for Co) in natural coastal waters of Egypt (El-Nady and Atta, 1996). Concentration factors of 1500 (Zn), 900 (Mn), 800 (Cu) and 310 (Cd) for U. lactuca, and 1200 (Zn), 900 (Mn), 700 (Cu) and 340 (Cd) for Enteromorpha clathrata were reported from Aquaba, Jordan (Wahbeh, 1985). U. lactuca has been used widely as a heavy metal indicator (e.g.…”

Section: Bioindicatorsmentioning

confidence: 70%

Coastal Pollution and Potential Biomonitors of Metals in Mauritius

Daby

2006

Water Air Soil Pollut

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Contaminant metals are potentially toxic, accumulate in the sediment, are bioconcentrated by organisms and may cause health problems to humans via the food chain. Discharge of industrial wastewaters and untreated sewage pose a particularly serious threat to the coastal environment of Mauritius, but very little information exists on contaminant metals. This study aimed principally to assess such contamination by (i) reviewing available data, (ii) examining the results of metal (Cd, Cu, Cr, Pb and Zn) analysis in (a) seawater, sediment and biota from an island-wide survey of 20 sites in 1999-2000, (b) seawater from a water quality survey (high tide and low tide) in 2003 of a 10 km stretch of sewage-impacted coast.UNEP reference methods were used for sample collection and processing, and metal analysis was perfomed by flame atomic absorption spectrophotometry (AAS). Results were compared with established guidelines and data reported from elsewhere, and examined for suitable plant and animal species as biomonitors.The pioneering study by SOGETI (1995) provided indications of high marine sediment contamination in Mauritius compared to data reported from elsewhere. The 1999-2000 islandwide survey indicated even higher sediment contamination, namely at hotspots, requiring the use of sediment quality guidelines (SQG) for monitoring and assessment. Maximum metal concentrations from these two studies were as follows: 736 μgg −1 Zn, 329 μgg −1 Mn, 98.1 μgg −1 Pb, 93.38 μgg −1 Cu, 91.39 μgg −1 Cr, 65.53 μgg −1 Sn and 55.01 μgg −1 Cd. Seawater contamination corresponded closely to the pattern of sediment contamination, both showing a downstream and away-from-the-outfall gradient. Applicable guidelines for seawater were exceeded at more than 50% of the sites around Mauritius with maximum concentrations of Cr, Cu, Zn, Pb and Cd as follows: 0.41, 0.352, 0.312, 0.247 and 0.232 mgl −1 , respectively. Maximum concentrations of Cu, Cd, Zn, Pb and Cr along the sewageimpacted shoreline occurred during low tide as follows: 0.454, 0.329, 0.259, 0.138 and 0.123 mgl −1 , respectively. The recommended limits for Cu, Cd and Zn were exceeded in all the samples. High tissue accumulation by marine biota corresponded to high levels of seawater and sediment contamination at hotspots. Species showing the highest potential as biomonitors (namely Ulva lactuca, Enteromorpha ramulosa,Crassostrea cuculatta, Isognomon isognomon and Echinometra mathaei) were identified based on their common occurrence, high bioconcentration potential and successful utilization in studies elsewhere.Enhanced levels of contaminant metals were recorded and suitable biomonitors were identified. It is advocated that a rigorous use of the suite of biomonitors proposed in this study and others later will allow identification of the different metal sources as well as provide an improved assessment of the magnitude of metal contamination in the coastal marine environment of Mauritius.

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Section: Bioindicatorsmentioning

confidence: 70%

Coastal Pollution and Potential Biomonitors of Metals in Mauritius

Daby

2006

Water Air Soil Pollut

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“…It has been recently shown that the skeletal Mg/Ca ratio in echinoid species Paracentrotus lividus may vary according to the type of consumed macroalgal diet (Asnaghi et al, 2014). More specifically, it was found that sea urchins fed non-calcifying algae Cystoseira displayed low Mg/Ca ratios in their skeletons comparing with those feeding on noncalcifying Dictyota and calcifying Corallina, that are generally thought to have higher Mg level (Wahbeh et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

Effects of seawater chemistry (Mg2+/Ca2+ ratio) and diet on the skeletal Mg/Ca ratio in the common sea urchin Paracentrotus lividus

Kołbuk

Dúbois

Stolarski

et al. 2019

Marine Environmental Research

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It has been argued that concentration of major metallic ions such as Mg 2+ and Ca 2+ plays a role in determining the composition of the echinoderm skeleton. Consequently, in several studies Mg/Ca ratio from modern and fossil echinoderm ossicles was used as a reliable proxy of secular Mg 2+ /Ca 2+ changes of Phanerozoic seawater. However, although significant progress has been made in understanding biomineralization of echinoderms, it is still largely unknown what are the sources and physiological pathways of major ions that contribute to skeleton formation. Herein we tested the effects of modifications of ambient seawater Mg 2+ /Ca 2+ ratio (~5) and Mg-enrichment of the diet on the Mg/Ca ratio in regenerating spines of sea urchin Paracentrotus lividus under experimental conditions. We found that sea urchins cultured in seawater with decreased Mg 2+ /Ca 2+ ratio (~1.9) produced a skeleton with also decreased Mg/Ca ratio. However, the skeleton of specimens fed on a Mg-enriched diet showed significantly higher Mg/Ca ratio. This suggests that the seawater is an important but not the only source of ions that contributes to the Mg/Ca ratio of the skeleton. Consequently, the reliability of geochemical models that link directly seawater chemistry with the Mg/Ca ratio of the skeleton should be reevaluated.

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“…Moreover, the study of bioaccumulation of Cd and Pb by seaweeds is of interest because these metals are toxic (Wood, 1974). In the Chlorophyta and Phaeophyta used in our study, only accumulation of Al (Malea, 1993) and of Fe, Zn, Cd, Pb, Cu and Mg by Cladophora albida and Padina pavonica, have so far been studied (Wahbeh et al, 1985;Haritonidis & Nikolaidis, 1989, 1990.…”

Section: Introductionmentioning

confidence: 99%

Metal content of some green and brown seaweeds from Antikyra Gulf (Greece)

1995

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An analysis was made of the levels of Fe, Cu, Zn, Cd, Pb, Na, K, Ca and Mg in three green and four brown seaweeds, abundant in the Antikyra Gulf (Viotia, Greece). After Ca and the macroelements K, Mg, Na, the higher concentrations found were of Fe and Pb, with Fe>Pb. Cadmium content was low in most species. Differences between species and taxonomic groups were also considered. Fe, Zn, Cd and Ca in the green alga Dasycladus vermicularis increased from March to July and had their maxima in summer or autumn (Cd), whereas Cu, Pb and Mg showed an opposite pattern of seasonal variation with maxima in winter. Cu, Zn, Cd and K in D. vermicularis were correlated with their concentrations in the sediment and not with their dissolved levels in seawater. Iron in D. vermicularis was positively correlated with Zn and negatively with Cd.

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Concentrations of zinc, manganese, copper, cadmium, magnesium and iron in ten species of algae and sea water from Aqaba, Jordan

Cited by 29 publications

References 14 publications

Coastal Pollution and Potential Biomonitors of Metals in Mauritius

Coastal Pollution and Potential Biomonitors of Metals in Mauritius

Effects of seawater chemistry (Mg2+/Ca2+ ratio) and diet on the skeletal Mg/Ca ratio in the common sea urchin Paracentrotus lividus

Metal content of some green and brown seaweeds from Antikyra Gulf (Greece)

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