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Environmental Issues
In an area where DDT had been used extensively, the population of birds declined significantly because
birds stopped laying eggs
earthworms in the area got eradicated
cobras were feeding exclusively on birds
many of the birds eggs laid, did not hatch
D.
many of the birds eggs laid, did not hatch
DDT, its breakdown products and other chlorinated hydrocarbon pesticides posed an insidious threat to birds. These persistent poisons enter the food chain and they accumulate in the fatty tissues of organisms at lower trophic level and then tend to concentrate as they move through the food chain. This is called biomagnification or bioconcentration. The insidious aspect of this phenomenon is that large concentrations of chlorinated hydrocarbons do not usually kill the bird out right. Rather, DDT and its relatives alter the bird's calcium metabolism in a way that results in thing egg shells which are unable to support the weight of incubating bird. So, many of the birds eggs laid are not hatched. This causes a significant decline in the population of birds.
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