January 22 - DDT is good for Me o Agricultural yields...

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January 22, 2010 What do plants have to do with social issues? Agricultural issues o Pesticides o Genetically modified organisms o Genetic diversity o Pollinator crisis Invasive Species Weird Sex Agricultural Issues and Environmental Impacts What are the environmental impacts of agricultural intensification Impacts of agricultural include Chemical inputs Reduced genetic diversity Habitat loss Reduced bio diversity Chemical Inputs form agriculture Fertilizers Steroids/hormones Insecticides Herbicides Fungicides DDT – dichloral diphenyl trichlorethane First synthesized in 1872 Insecticide properties discovered in 1939 by Paul Hermann Muller – won Nobel Prize A miracle of the 1950s
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Unformatted text preview: DDT is good for Me o Agricultural yields increased o Malaria eradicated in North America and Europe o Worldwide malaria reduced from 192 to 7 per 100,000 Why so effective? o Toxic to many insects, less to mammals o Fat soluble, doesnt wash away with water o Persistent (not easily broken down) o Cheap and easy to apply o Birds Colonies of gulls began to decline in 1960s Many predatory birds declines Reproductive failure: interferences with egg shell development o Why are predatory birds most affected? Bioaccumulation an increase in concentration as you go up the food chain DDT accumulates in fatty tissues...
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This note was uploaded on 11/18/2011 for the course BIO 105 taught by Professor Adler,irschick,podos during the Fall '08 term at UMass (Amherst).

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