- Associated Press - Wednesday, September 19, 2012

ROBINSON CRUSOE ISLAND, CHILE (AP) - It’s still a natural paradise far out in the Pacific, with thick jungles and stunningly steep and verdant slopes climbing out of the sea. But much of the splendor in the tiny Chilean islands that likely inspired Daniel Defoe’s “Robinson Crusoe” castaway novel is being eaten away.

Nearly four centuries of human contact have left many slopes denuded, their trees and plants lost to logging and fires, or devoured by imported goats and rabbits. Jungles remain, but invasive species are crowding out the unique native plants and birds that evolved during more than a million years of splendid isolation.

“It’s a textbook example of how to degrade an ecosystem,” said Cristian Estades of the University of Chile, an expert on the islands’ birds.

A handful of biologists, environmentalists, teachers and Chilean government officials are working with islanders on projects to save endangered species by eliminating non-native plants and animals. In a world full of daunting environmental challenges, they say this one can be solved with enough time, effort and money, in part because the three islands are so remote _ 416 miles (670 kilometers) west of the Chilean mainland.

Chile has a $12 million plan to keep more outside species from reaching the Juan Fernandez archipelago and control what’s already here. Island Conservation and other nonprofit groups say $20 million is needed just to start, by baiting the jungles with poison and flying hunters in on helicopters to eliminate animals that don’t belong. Millions more would then be needed to keep invaders out and restore the natives.

Neither plan is fully funded, however, and at this point the scientists involved can do little more than document what’s disappearing.

The islands were declared a world biosphere reserve by the United Nations in 1977. For their size, a total of just 38 square miles (100 square kilometers), they are 61 times richer in plant diversity and 13 times richer in bird life than the Galapagos, according to Island Conservation.

They still have 137 plants and a handful of bird species found nowhere else in the world, including a brilliant red hummingbird and the Dendroseris gigantea, a species so rare that until a few years ago, there was only a single tree left alive.

Forty-nine of the islands’ plant species and seven kinds of birds are classified as critically endangered by the International Union for the Conservation of Nature. At least eight others have already become extinct.

Their main enemies are the plants and animals imported by humans: Not only goats and rabbits, but cats, rats, mice and the carnivorous coati, a type of raccoon native to the American tropics. The cats are particularly adept at hunting the hummingbirds, whose numbers have dropped to as low as 1,000, in part because they didn’t evolve in ways that made them fear feline predators.

Chilean settlers have cut down native trees and planted other types that foster wildfires and transform birds’ habitats. Fast-growing blackberry brambles native to Europe and North Africa and maqui fruit trees native to mainland Chile have done the most damage, along with imported eucalyptus trees that grow as high as 230 feet (70 meters), sucking up groundwater and acidifying the soil.

“I don’t want to think that this kind of cancer can’t be solved,” said Juan Carlos Ordenes, who teaches history and geography in the islands’ only school, and regularly leads his students on root-pulling expeditions.

Skeptics wonder if it’s worth spending millions of dollars to preserve a few birds and plants on islands so small that they don’t appear on many maps. But Hugo Arnal, the South America director for Island Conservation, says “the cost of inaction is much more expensive.”

Without the dense jungles and unique trees and hummingbirds, tourists won’t come, topsoil will blow away and fresh water for the 700 islanders will dry up. Supplying their town with food and essentials would become much more expensive for Chile’s navy, which currently sails to the island once a month.

“The economic development of Juan Fernandez will depend on maintaining a healthy biodiversity: controlled and sustainable shrimp fishing, and ecotourism based on its unique species,” he said.

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