August 2, 2010 7:03 AM

Seeping oil threatens ecosystems in Gulf marshes

The marshes on the Gulf Coast serve as nurseries for shrimp, crabs and other sea life, a nesting ground for pelicans and other birds and a much-needed buffer against hurricanes. The millions of gallons of oil spilled already threatens to kill the intricate ecosystem. Without the marsh, smaller fish won't be able to hide from predators. Shrimp won't breed and birds won't nest. The grasses won't be there to block the tidal surges.

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