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Toxic Fungus Hurting Frog Population
Written by Susan Lillard   
Tuesday, 07 February 2012 19:42

new zealand frogA toxic fungus blamed for decimating amphibian populations around the world has been found in New Zealand, prompting fears that the country's four unique frog species could be wiped out.

Six months ago the native Archey's frog population was found infected with the chytrid fungus, believed to be responsible for a rapid decline in a number of species, Canterbury University ecologist Bruce Waldman said yesterday.

New Zealand's four matchbox-sized native frog species all lack ears, don't croak and hatch directly into froglets without going through a tadpole stage.

"These are living fossil frogs...They were alive before there were dinosaurs roaming. These frogs - not necessarily the same species but frogs that morphologically are very, very similar - lived 200 million years ago."

Three of the species live entirely on land and all have little or no webbing between their toes.

New Zealand's rarest species, the Hamilton's frog, numbers less than 300 and is found only on a few hundred square meters (yards) of rocky ground on the summit of a single islet between the South Pacific country's main North and South Islands.

Populations of the most widely found native frog, the Hochstetter's frog, were also in decline and research was under way to discover if the fungus was responsible, Waldman said. The chytrid fungus, identified in Australia and Central America in 1998, was discovered in New Zealand in 1999. The fungus kills most of the frogs it infects. Frog populations around the world have been in decline in recent years, with researchers variously blaming the chytrid fungus, habitat loss, viruses and pollution for the reduced numbers.

U.S. researchers reported they had found that very low levels of a popular weed killer can cause male frogs to grow female sex organs and curtail their croaks.

Some scientists view frogs as an ecological barometer, but Waldman disputes that claim.

 

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