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Aerobic bacteriology of waste stabilization ponds 总被引:1,自引:0,他引:1
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Environment Systems and Decisions - 相似文献
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Brian Baily Alastair Pearson Peter Collier Dominic Fontana 《Journal of Coastal Conservation》2002,8(1):77-86
This paper discusses a research project dealing with the mapping of the intertidal vegetation of several harbours along the
southern coastline of England. It describes in detail the methods used to map the vegetation and gives examples of the results
from these studies. This paper then goes on to explain how these results are applied by the Environment Agency of England
and Wales to improve water quality in the harbours. This type of vegetation mapping is useful in monitoring the development
of the intertidal species includingSpartina, Zostera and of particular importance to this study the green algaeUlva andEnteromorpha. The work was undertaken with funding from the Environment Agency and at present has taken place over a four year period.
The data collected will be used by the Environment Agency to assess macro-algae covervalues for the intertidal area of the
harbours concerned. This forms part of the Agency's commitment to the EU Nitrates Directive and the Urban Waste Water Treatment
Directive. Some of the species mapped act as suitable indicators of water quality and are symptoms of entrophication. Other
species are of interest for nature conservation and were recorded to provide a record for longer-term trends in vegetation
patterns within the harbour. This paper aims to provide readers with an understanding of the techniques involved as well as
an evaluation of the methodology. 相似文献
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The acute toxicity of 11 heavy metals to embryos of the American oyster Crassostrea virginica was studied and the concentrations at which 50% of the embryos did not develop were determined. The most toxic metals and their LC50 values were mercury (0.0056 ppm), silver (0.0058 ppm), copper (0.103 ppm) and zinc (0.31 ppm). Those metals that were not as toxic and their LC50 values were nickel (1.18 ppm), lead (2.45 ppm) and cadmium (3.80 ppm). Those metals that were relatively non-toxic and their LC50 values were arsenic (7.5 ppm), chromium (10.3 ppm) and manganese (16.0 ppm). Aluminum was non-toxic at 7.5 ppm, the highest concentration tested. 相似文献
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Environment Systems and Decisions - 相似文献
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Rapinski Michel Payette Fanny Sonnentag Oliver Herrmann Thora Martina Royer Marie-Jeanne S. Cuerrier Alain Siegwart Collier Laura Hermanutz Luise Guanish George 《Regional Environmental Change》2018,18(1):189-203
Regional Environmental Change - For Inuit and Naskapi living in the eastern Canadian Subarctic, local meteorological and environmental conditions (e.g., snow and ice cover extent, thickness, and... 相似文献