Ornithologists observed decline in the bird population in an area near a lake after the setting of an industrial unit in the same area.Explain the cause responsible for the decline observed.(PS:I am not sure about the chapter)

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This is due to the contamination of lake water by DDT from the industries. Fishes present in water consumes those DDT and it subsequently gets magnified in a food chain. Birds which consumes those fish also gets affected as DDT affects calcium metabolism. As a result of which the egg shell of birds does not properly develop, which causes early breakdown of shells and the embryo remains under-developed. This leads to the decline in the bird population in an area near a lake after the setting of an industrial unit in the same area​.

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