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Nepal. The lush jungles of the Chitwan national park in southern Nepal are among the last remaining refuges of the endangered royal Bengal tiger and the rare one-horned rhino.

But conservationists say the huge wildlife reserve is under threat from a foreign invader that is destroying its delicate eco-system, with potentially catastrophic implications for the animals that live there.

Over the past decade and a half, a non-native creeper dubbed “mile-a-minute” for its rampant growth has covered large swathes of the 932-square-kilometer park, a Unesco world heritage site.

Biologist Naresh Subedi says the plant, micania micrantha, has already engulfed more than a third of prime rhino habitat in the national park, and believes its impact could be devastating.

“Micania is ... one of the most invasive plants in the world,” said Subedi, who works for the National Trust for Nature Conservation (NTNC) in Chitwan.

“It can smother, choke and pull over other plants, it causes soil erosion, and no single technique has yet proved effective for its long-term control.

“More than a third of the rhino habitat in Chitwan has now been covered to a greater or lesser degree, posing a serious threat to the population.”

Although micania is edible, it is nutritionally deficient compared to the native grasses of Chitwan which can sustain “mega-herbivores” like rhinos which require a large, daily intake of nutrient-rich vegetation.

Native to South America, micania grows over the plants that make up the diet of the rhinos, blocking the sunlight they need.

A single plant can produce between 20,000 and 40,000 seeds, which are dispersed by wind, and its shoots are reported to grow by up to 2.7 centimeters a day.

The threat to the rhino population comes as numbers are beginning to recover after a 10-year Maoist insurgency in Nepal, during which poachers were given free rein as soldiers protecting the park left to battle the rebels.

The last count, in 2008, found 408 rhinos living in Chitwan, the second largest population in the world and up from 372 in 2005, a year before the conflict ended.

Conservationists say the park’s tigers, already hunted to the brink of extinction, will also suffer if the deer and other herbivores they prey on are hit by the diminished availability of food.

Bengal tigers were once found throughout Nepal’s southern lowlands, which border India, but poaching and the destruction of their natural habitat have drastically reduced numbers.

A World Wildlife Fund survey carried out two years ago found just 121 tigers of breeding age living in Nepal, most of them in the Chitwan national park.

WWF conservationist Rinjan Shrestha is working on a national strategy to control the spread of the weed, which he says is critical to the survival of rhinos and elephants in the park.

But he acknowledges it will be difficult.

No reliable method of killing the weed without harming the vegetation around it has yet been found, although experiments with a fungus that poisons it are being conducted in India.


Agence France-Presse