MANGROVE FOREST

The study, conducted by researchers at the University of Delhi and Duke University, analyzed deaths in villages in the poor, mostly rural Kendrapada District of the Indian state of Orissa, just north of the cyclone's landfall.Our analysis shows a clear inverse relationship between the number of deaths per village and the width of the mangroves located between those villages and the coast," said Jeffrey R. Vincent, Clarence F. Korstian Professor of Forest Economics and Management at Duke's Nicholas School of the Environment.


Taking other environmental and socioeconomic factors into account, villages with wider mangroves suffered significantly fewer deaths than ones with narrower or no mangroves, Vincent said. We believe this is the first robust evidence that mangroves can protect coastal villages against certain types of natural disasters.Vincent conducted the analysis with Saudamini Das of the University of Delhi's Swami Shradanand College. Their findings appear in a paper in this week's online early edition of The Proceedings of the National Academy of Sciences.


Mangroves are dense forests of trees and shrubs that grow in brackish, low lying coastal swamps in the tropics and subtropics. mangroves covered nearly hectares of land in Kendrapada District and the average village had kilometers of mangroves between it and the coast. Since then, nearly half the area has been cleared, mostly for rice production. Today, the average width of mangroves between the villages and the coast has shrunk to kilometers.
The storm, which made landfall on Oct. killed nearly people, more than percent of whom drowned in its surge.Using statistical models, Das and Vincent predicted there would have been additional deaths per village within kilometers of the coast if the mangrove width had been reduced to zero.


"This is a measure of the life saving impact of the mangroves that remained in Vincent said. It implies that they cut the death toll by about twothirds.Although mangroves evidently saved fewer lives than an early warning issued by the Indian government, the retention of the remaining mangroves in Orissa is economically justified, Vincent believes, even without considering the many other environmental benefits they provide, such as acting as nurseries for economically and environmentally vital fisheries, or sites for ecotourism. Previously published estimates of Indians' willingness to pay to reduce the risk of accidental deaths are higher than Das and Vincent's estimate of the cost of saving lives in Orissa by retaining mangroves.