A promising enterprise became an economical and ecological disaster. The golden apple snail (Pomacea canaliculata) that was brought to Asia in 1980 to be cultured in ponds for human consumption instead spread through rice fields, irrigation channels and wetlands. It had a voracious appetite for rice seedlings and soon became a dreaded pest in the rice fields. In the Philippines alone, accumulative crop losses since the snail introduction is estimated to 1 billion US dollars. The snail is still spreading in South East Asia and it has recently invaded North Australia, Hawaii and southern USA. Recent research, however, shows that the invasive snail is a serious threat to natural environments as well.
This is because the snail consumes the aquatic plants in natural wetlands. These wetlands harbor great biodiversity, and many of the animals depend on aquatic plants for their survival at some life stage. These wetlands are also an important resource in the “unofficial economy” since the rural poor harvest plants, catch fish and collect drinking water in the wetlands.
– The ongoing invasion is nothing but an ecological disaster says Nils O L Carlsson at Lund University, who has quantified the effects of the invasive snail on natural wetlands in Laos and Thailand.
Göran Frankel | alfa
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