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Acidification resulting from the increase of carbon dioxide in the ocean is one of the main effects of global warming. Models predict that a decrease of pH in surface sediments results in higher mobility of metals in sediment pore water and overlying water. This hypothesis has been tested in an exposure sediment bioassay using the clam R. philippinarum. Different sediment samples (toxic mud from a...
The effects of heavy metals on the structure of phytoplankton and zooplankton communities were determined in Sado River, Portugal, during the period of highest production (summer). Two tributaries, receiving wastes from pyrite mines, enter the river and gave rise, in the middle reaches, to dissolved metal concentrations up to 88 μg1 -1 Cu, 2.6 μg1 -1 Cd and 1800 μg1 ...
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