965 resultados para Trade Association
Resumo:
This is the second report of the ALT’s Annual Survey which was open for responses between the 1st December 2015 and 17th January 2016. In total 196 responses have been analysed as part of this report. Given a number of core questions remain unchanged between this and the 2014 edition of the survey analysis includes data from the previous survey.
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Part 2 covers the definition of an immature fish, evidence of deterioration in the North Sea trade, life history of North Sea food fish, discussion on and proposed measures to counter the destruction of immature fish.
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The rationale behind the use of analyses of estuarine organisms to assess levels of heavy-metal contamination is described and compared with alternative methods such as the analysis of waters or sediments. Based on field observations in United Kingdom estuaries and on evidence from the literature, an assessment is made of the suitability of 17 species as the indicators of metals and metalloids including Ag, As, Cd, Co, Cr, Cu, Hg, Ni, Se, Sn, Pb and Zn.
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A 64-page catalogue of material in the MBA Archive Collection containing details of documents, records, and personal papers relating to the history and development of the Marine Biological Association.
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The use of the deposit-feeding molluscs Scrobicularia plana and Macoma balthica and the burrowing polychaete Nereis diversicolor as indicators of the biological availability of heavy metals in sediments has been evaluated. Concentrations of Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Sn and Zn have been measured in organisms and sediments from more than 30 estuaries in south west England and South Wales and indicate that the biological availability of most metals varies by order of magnitude between uncontaminated and contaminated sites. The results have been compared with those obtained with the use of other species of indicator organisms in estuaries.
Resumo:
The Fal Estuary System in West Cornwall has, over many centuries, received inputs of heavy metals from various mining activities. In this context its most important tributary is the Carnon River. Analyses of organisms from the Fal Estuary have shown that some species contain abnormally high concentrations of Cu, Zn and As, especially those living in Restronguet Creek.