Biodynamic modelling of the bioaccumulation of arsenic by the polychaete Nereis diversicolor

2011 ◽  
Vol 8 (1) ◽  
pp. 1 ◽  
Author(s):  
P. S. Rainbow ◽  
B. D. Smith ◽  
M. C. Casado-Martinez
Keyword(s):  
Assimilation Efficiency ◽  
Estuarine Sediments ◽  
Food Chains ◽  
Efflux Rate ◽  
Nereis Diversicolor ◽  
Water And Sediment ◽  
Uptake Rate Constant ◽  
Deposit Feeding ◽  
Context Models ◽  
Very High

Environmental context Models that explain the uptake and bioaccumulation of an element in an aquatic ecosystem are valuable for predicting its potential ecotoxicity in coastal areas. Arsenic is a toxic element that is strongly adsorbed to sediments, offering a potential risk to deposit-feeding invertebrates, and ultimately to consumers higher up coastal food chains. This study uses biodynamic modelling to predict the uptake and accumulation of arsenic from water and sediment in a deposit-feeding polychaete worm that is a major source of food to fish and wading birds in estuaries. Abstract Arsenic (AsV) uptake and bioaccumulation from water and ingested sediment by the deposit-feeding polychaete Nereis diversicolor has been investigated using biodynamic modelling. Worms accumulated As from solution linearly at dissolved concentrations from 2 to 20 µg L–1 (uptake rate constant 0.057 l g–1 day–1 at 10°C, 16-psu salinity), and the As assimilation efficiency from ingested sediment was 28.9%. Efflux rate constants of As taken up from water and ingested sediment were 0.0488 and 0.0464 day–1 and did not differ significantly. Sediment As concentrations, ranging from very high to low, were measured at eight estuarine sites, and the model predicted accumulated As concentrations in resident N. diversicolor. Comparisons of predicted against independently measured As concentrations in locally collected worms showed that the model generally performed well, highlighting the potential of biodynamic modelling in predicting the uptake and therefore ecotoxicity of As in estuarine sediments.

The Distribution of Mercury in British Estuarine Sediments and Its Availability to Deposit-Feeding Bivalves

1982 ◽  
Vol 62 (3) ◽  
pp. 667-684 ◽  
Author(s):  
W. J. Langston
Keyword(s):  
Estuarine Sediments ◽  
Food Chains ◽  
Aquatic Environments ◽  
Essential Metals ◽  
Cadmium And Lead ◽  
Deposit Feeding ◽  
Harmful Effects

The recognition that non-essential metals, such as mercury, cadmium and lead, could, upon entering aquatic environments, produce harmful effects to man, directly or through food chains, has resulted in studies directed towards the identification of potentially hazardous levels.

scholarly journals Effect of polluted water on soil and plant contamination by heavy metals in El-Mahla El-Kobra, Egypt

Solid Earth ◽  
2016 ◽  
Vol 7 (2) ◽  
pp. 703-711 ◽  
Author(s):  
Esawy Kasem Mahmoud ◽  
Adel Mohamed Ghoneim
Keyword(s):  
Heavy Metals ◽  
Cynodon Dactylon ◽  
Oxygen Demand ◽  
Polluted Water ◽  
Contaminated Water ◽  
Water And Sediment ◽  
Bioaccumulation Coefficient ◽  
The Mean ◽  
Very High ◽  
Irrigated Soils

Abstract. The discharge of untreated waste water in Zefta drain and drain no. 5 is becoming a problem for many farmers in the El-Mahla El-Kobra area, Egypt. The discharged water contains high levels of contaminants considered hazardous to the ecosystem. Some plants, soil, water, and sediment samples were collected from the El-Mahla El-Kobra area to evaluate the contamination by heavy metals. The results showed that the heavy metals, pH, sodium adsorption ratio (SAR), biochemical oxygen demand (BOD), and chemical oxygen demand (COD) in the water of Zefta drain and drain no. 5 exceeded permissible limits for irrigation. In rice and maize shoots grown in soils irrigated by contaminated water from Zefta drain and drain no. 5, the bioaccumulation factors for Cd, Pb, Zn, Cu, and Mn were higher than 1.0. The heavy metals content of irrigated soils from Zefta drain and drain no. 5 exceeded the upper limit of background heavy metals. In this study, the mean contaminant factor values of the drain no. 5 sediments revealed that Zn, Mn, Cu, Cd, Pb, and Ni > 6, indicating very high contamination. The bioaccumulation coefficient values of Cynodon dactylon, Phragmites australis, and Typha domingensis aquatic plants growing in Zefta drain are high. These species can be considered as hyperaccumulators for the decontamination of contaminated water.

A suitable model for the biomonitoring of trace metal bioavailabilities in estuarine sediments: the annelid polychaete Nereis diversicolor

2006 ◽  
Vol 86 (1) ◽  
pp. 71-82 ◽  
Author(s):  
Laurence Poirier ◽  
Brigitte Berthet ◽  
Jean-Claude Amiard ◽  
Anne-Yvonne Jeantet ◽  
Claude Amiard-Triquet
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Metal Contamination ◽  
Estuarine Sediments ◽  
Suitable Model ◽  
English Channel ◽  
Metal Concentrations ◽  
Trace Metal Contamination ◽  
Nereis Diversicolor ◽  
Total Sediment

The need to use biomonitors representative of the sedimentary compartment has been recognized, particularly in estuaries. Thus, trace metal contamination has been monitored in an infaunal polychaete worm Nereis diversicolor and sediments in the Seine estuary and comparatively in the relatively clean Authie estuary (French coast of the English Channel) over two years taking samples every three months at both sites. No correlations were shown between total metal (Ag, Cd, Cu, Pb, Zn) concentrations in raw sediments and ragworms. Because these worms are known to be good biomonitors of the bioavailabilities of sedimentary trace metals, it follows that total sediment metal concentrations have a poor predictive ecotoxicological value. Using a correction factor to minimize the influence of weight, it is possible to make a good estimation of the average metal concentrations in a population of worms at a given site, sampling only a limited number of specimens. Metallothioneins are often considered to be good biomarkers of the presence of significant availabilities of trace metals. Metallothionein-like proteins (MTLPs) are present in N. diversicolor, but there is no significant relationship between MTLPs and metal concentrations. This situation might result from the importance of metal-containing granules, both extra- and intracellular, in ragworms.

Interactions between benthic molluscs in a Sulawesi mangal, Indonesia: the cerithiid mud-creeper Cerithium coralium and potamidid mud-whelks, Terebralia spp.

2003 ◽  
Vol 83 (3) ◽  
pp. 483-487 ◽  
Author(s):  
R.S.K. BARNES
Keyword(s):  
Feeding Rate ◽  
Inhibitory Effect ◽  
High Density ◽  
Sediment Surface ◽  
Normal Range ◽  
Numerous Species ◽  
Faecal Pellets ◽  
Strong Inhibitory Effect ◽  
Deposit Feeding ◽  
Very High

The sediment surface within the Osbornia belt of a mangal on Pulau Hoga, Tukang Besi Islands, Sulawesi, Indonesia, is dominated inter alia by deposit-feeding gastropod molluscs at a mean density of some 230 ind m−2 although, unusually, species of Cerithidea do not occur. Densities of the two most numerous species, the potamidid mud-whelk Terebralia sulcata and the Cerithidea-like cerithiid mud-creeper Cerithium coralium, are inversely correlated, although the species occurred together in 42% of quadrat samples. Within and beyond the normal range of field densities of each species (C. coralium mean 153 m−2; T. sulcata mean 75 m−2) there was no evidence of intraspecific depression of feeding rate, as assessed by the production of faecal pellets, although this was significantly reduced in the occasional very high density aggregations of C. coralium (>1100 m−2). The presence of the larger T. sulcata did appear to have a strong inhibitory effect on feeding in C. coralium; the converse, however, could not be demonstrated. Abundances of Terebralia palustris and C. coralium were also inversely correlated where the two co-occurred.

Adaptation of the PolychaeteNereis Diversicolorto Estuarine Sediments Containing High Concentrations of Zinc and Cadmium

1973 ◽  
Vol 53 (4) ◽  
pp. 839-857 ◽  
Author(s):  
G. W. Bryan ◽  
L. G. Hummerstone
Keyword(s):  
The Other ◽  
Estuarine Sediments ◽  
Nereis Diversicolor ◽  
Other Hand ◽  
High Concentrations

In the first paper of this series (Bryan & Hummerstone, 1971) it was shown that in the estuarine polychaeteNereis diversicolorO. F. Müller the concentration of copper is roughly proportional to that of the surrounding sediment. On the other hand, concentrations of zinc appeared to be relatively independent of those in the sediment and it was suggested that the level of zinc in the worm is regulated.

Heavy Metals in the Burrowing Bivalve Scrobicularia Plana From Contaminated and Uncontaminated Estuaries

1978 ◽  
Vol 58 (2) ◽  
pp. 401-419 ◽  
Author(s):  
G. W. Bryan ◽  
L. G. Hummerstone
Keyword(s):  
Heavy Metals ◽  
Life Span ◽  
Mytilus Edulis ◽  
Shell Length ◽  
Estuarine Sediments ◽  
Biological Availability ◽  
The South ◽  
Scrobicularia Plana ◽  
Deposit Feeding

Analysis of the deposit-feeding bivalve Scrobicularia plana (da Costa) has been proposed as a method of assessing the biological availability of heavy metals in estuarine sediments (Bryan & Hummerstone, 1977; Bryan & Uysal, 1978). Scrobicularia has a number of attributes which are useful in this type of indicator: (i) it is common in many British estuaries, particularly in the south, and often penetrates much farther upstream than other common bivalves such as Mytilus edulis; (ii) it is a convenient size for analysis and, during its life span of perhaps 10 years, reaches a shell length of 40-50 mm (Green, 1957; Hughes, 1970); (iii) it is a good accumulator of metals and appears to reflect changes in their biological availability.

Uptake and Efflux of Noradrenaline from Platelets; a Model System for Neurogenic Mechanisms in Essential Hypertension

1979 ◽  
Vol 57 (s5) ◽  
pp. 225s-227s ◽  
Author(s):  
I. Mattiasson ◽  
B. Mattiasson ◽  
B. Hood
Keyword(s):  
Blood Pressure ◽  
Essential Hypertension ◽  
Family History ◽  
Model System ◽  
Efflux Rate ◽  
Efflux Of Noradrenaline ◽  
High K ◽  
History Of ◽  
Family History Of Hypertension ◽  
Very High

1. The rate (k) of initial efflux of noradrenaline from platelets was determined in 63 individuals. A highly significant correlation was found between diastolic blood pressure and efflux rate. 2. When platelets are incubated in buffers with various Na+ concentrations in the range 110–170 mmol/l a higher Na+ concentration will give a faster efflux of noradrenaline for each concentration tested. 3. The value for k was determined in 41 normotensive first-degree relatives of hypertensive individuals and 21 persons with no family history of hypertension. Efflux rate of noradrenaline was significantly higher in the relatives and within this group was a subgroup with very high k values.

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