Biological magnification of pcbs has been found in the food web of the great lakes, where the concentration of pcbs in herring gull eggs, at the top of the food web, is nearly 5,000 times that in phytoplankton,

Biological magnification of pcbs has been found in the food web of the great lakes, where the concentration of pcbs in herring gull eggs, at the top of the food web, is nearly 5,000 times that in phytoplankton, at the base of the food web.

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Biological magnification of pcbs has been found in the food web of the great lakes, where the concentration of pcbs in herring gull eggs, at the top of the food web, is nearly 5…

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