March 08, 2010
In 2008 Luke Pearce, a fisheries conservation officer, stumbled on a frog that had been thought to be extinct for over thirty years. Not recorded since the 1970s, Pearce rediscovered the yellow-spotted bell frog (Litoria castanea) on rural Australian farmland in the Southern Tableland of New South Wales.
Last year Pearce and others returned to the same stream and confirmed a colony of 100 yellow-spotted bell frogs. Some tadpoles were also collected for a breeding program in captivity. Although the species is back from extinction, it is still gravely threatened since there are so few individuals and all are known from only one location.
The yellow-spotted bell frog's population collapsed due to the chytrid fungus. Although researchers are not certain why this population survived, they speculate that these individuals could have a genetic resistance to the fungus.
"Scientists were convinced the Yellow-spotted Bell Frog had become extinct, following the tragic path of seven other Australian frog species," said Frank Sartor, the Minister of the Environment and Climate Change, in a press release. "I’m advised that finding this frog is as significant as discovering a Tasmanian tiger. This discovery is a reminder of the need to protect the environment so future generations can enjoy the noise and color of our native animals.”
The announcement wasn't made until conservation measures could be put in place to protect the remaining population of the yellow-spotted bell frog. In addition, the location of the frogs is being kept a closely-guarded secret for their protection.
The yellow-spotted bell frog is known locally as the 'motorbike' frog due to its unique call.
One third of the world's amphibians are in danger of extinction according to the IUCN Red List. Approximately 170 species have gone extinct since 1980, but as the yellow-spotted bell frog sometimes a species can come back from the dead.
Photos: Madagascar's wonderful and wild frogs, an interview with Sahonagasy
(03/03/2010) To save Madagascar's embattled and beautiful amphibians, scientists are turning to the web. A new site built by herpetologists, Sahonagasy, is dedicated to gathering and providing information about Madagascar's unique amphibians in a bid to save them from the growing threat of extinction. "The past 20 years have seen resources wasted because of a poor coordination of efforts," explains Miguel Vences, herpetologist and professor at the Technical University of Braunschweig. "Many surveys and reports have been produced that were never published, many tourists found and photographed amphibians but these photos were not made available to mapping projects, many studies carried out by Malagasy students did not make use of literature because it was not available."
Common pesticide changes male frogs into females, likely devastating populations
(03/01/2010) One of the world's most popular pesticides, atrazine, chemically castrates male frogs and in some instances changes them into completely functionally females, according to a new study in the Proceedings of the National Academy of Sciences. The authors conclude that atrazine likely plays a large, but unsuspected role in the current global amphibian crisis.
Bronx Zoo puts 'extinct' frogs on display
(02/02/2010) The Bronx Zoo has a put a most unusual frog on display: the Kihansi spray toad. For one thing, the Kihansi spray toad survived on only 5 acres in the Kihansi gorge in Tanzania, adapted to the areas' unique and constant mist from the gorge and a waterfall. For another, female Kihansi spray toads give birth to live young, instead of laying eggs. Finally, the Kihansi spray toad is extinct—at least in the wild.