Geochemical studies in several rivers and estuaries used for oyster rearing

Thornton, I.; Watling, H.R.; Darracott, Ann

doi:10.1016/0048-9697(75)90025-x

Cited by 66 publications

(10 citation statements)

References 13 publications

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“…Although the Helford catchment has moderate copper and zinc mineralisation (Thornton et al, 1975), the estuarine waters are considered to be relatively little contaminated by trace metals. By contrast, Restronguet Creek has received considerable attention because of its extreme contamination by cadmium, copper and zinc in particular, derived from past and present mining activities.…”

Section: Seasonal Studiesmentioning

confidence: 99%

“…Mean ing degree of mineralisation; the Helford Estuary is concentrations of zinc, their standard deviations and relatively uncontaminated by metals, whereas the corresponding coefficients of variation (%, calcuRestronguet Creek is one of the most contaminated lated as X 100) were calculated for each of these estuaries in England for certain elements (Bryan and mean subsamples in each population. Data for each subsamHummerstone, 1971subsamHummerstone, , 1973aThornton et al, 1975; ple category were then subjected to t-tests to indicate Boyden, 1977). A random subsample of 38 individuals the probability that the subsamples were derived from was taken at transplantation for determination of inipopulations differing in zinc concentration.…”

Section: Variability Studiesmentioning

confidence: 99%

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Seasonal Variation and Inherent Variability of Trace Elements in Oysters and Their lmplications for Indicator Studies

Phillips¹

1981

Mar. Ecol. Prog. Ser.

106

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The seasonal variation in concentrations and body burdens of 8 trace elements in the Pacific oyster Crassostrea gigas Thunberg was investigated, using individuals transplanted from Menai Strait in Wales to 2 Cornish estuaries. Seven of the 8 elements exhibited generally similar profiles for concentration, maxima occurring in winter and minima in summer. Some differences were noted in profiles for body burdens of these elements, depending on the loss of metals with gametes at spawning or on the rate of element uptake during autumn and winter. However, in each case, seasonal variation in concentration of the element was defined largely by changes in the weights of the whole soft parts of oysters, which in turn were dependent on the gametogenesis-spawning cycle. The 8th element, manganese, exhibited quite different kinetics; tissue weights of the oysters were of much less importance in defining seasonality of this metal. These data are compared to those of other authors in attempts to produce general conclusions on the seasonality of trace elements in blvalve molluscs. The inherent variability of zinc levels in three populations of two species of oyster, C. gigas and Ostrea edulis (L.), was also investigated to estimate the minimum number of individuals required to characterise element levels in a n oyster population. The possible reasons for the existence of inherent variability of element concentrations in bivalves are discussed, and the implications of both inherent variability and seasonallty of elements are considered with respect to monitoring studies using bivalves as biological indicators of metal abundance.

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Section: Seasonal Studiesmentioning

confidence: 99%

Section: Variability Studiesmentioning

confidence: 99%

Seasonal Variation and Inherent Variability of Trace Elements in Oysters and Their lmplications for Indicator Studies

Phillips¹

1981

Mar. Ecol. Prog. Ser.

106

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“…This enabled corrections to be made for the effect of iron on chromium analyses of sediments and showed that analyses of silver in tissues were not seriously affected by lipids which are difficult to digest with nitric acid (Anderlini, 1974). Thornton, Watling & Darracott (1975) have advocated the analysis of freshwater sediment as a means of recognizing areas of mineralization or metal contamination. Results for silver and lead in freshwater sediments are compared with those in the estuary in Fig.…”

Section: E T H O D Smentioning

confidence: 98%

Indicators of heavy-metal contamination in the Looe Estuary (Cornwall) with particular regard to silver and lead

1977

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A map of the Looe Estuary in south-east Cornwall is shown in Fig. 1. As it flows to the western branch of the estuary, the West Looe River passes through the Herodsfoot mining area which lies about 5 km above Sowden's Bridge. By Cornish standards, this was a productive area for lead and Dewey (1921) gives the output of Herodsfoot mine as 13470 tons of metal between 1848 and 1884 and more than 17 tons of silver between 1853 and 1884.

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“…Speciation studies of the trace metals indicate predominantly labile inorganic species (Johnson 1984). Together the tributaries combine to cause considerable trace-element contamination of the waters and sediments of the river and estuary (Hosking and Obial 1966; Thornton et al 1975;Boyden et al 1979;Thorne 1983;Johnson 1984Johnson , 1986.…”

Section: Study Areasmentioning

confidence: 99%

Positively charged suspended particles: Studies in an iron‐rich river and its estuary1

Newton

Liss

1987

Limnology & Oceanography

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Natural particles in suspension in fresh, marine, and estuarine surface waters generally display a narrow range of negative electrophoretic mobilities. The measured mobilities are thought to bc controlled by organic and oxide surface coatings, and there is considerable evidence for control by the organic coatings. Here we present results which indicate that oxide-hydroxide coatings can control the mobility under conditions found in a river fed by acid-mine drainage, but that organic coatings, when present, assume overall mobility control. Electrophoretic measurements show positivcly charged river particles acquiring less positive and then negative charges in estuarine waters. In the river and at low salinities mobility is affected by the pH of the water. At higher salinities the oxide-hydroxide character is less evident, and particles assume the negative mobilities normally found in natural waters and attributed to organic surface coatings.

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Geochemical studies in several rivers and estuaries used for oyster rearing

Cited by 66 publications

References 13 publications

Seasonal Variation and Inherent Variability of Trace Elements in Oysters and Their lmplications for Indicator Studies

Seasonal Variation and Inherent Variability of Trace Elements in Oysters and Their lmplications for Indicator Studies

Indicators of heavy-metal contamination in the Looe Estuary (Cornwall) with particular regard to silver and lead

Positively charged suspended particles: Studies in an iron‐rich river and its estuary1

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