MEXICO: A deadly fungus which has been ravaging amphibian populations across the world has somehow found its way to the isolated island of Madagascar, according to new surveys. And that’s the stuff of nightmares for conservationists, as the island happens to be countless frog species, 99 percent of which can be found nowhere else in the world.
A study, recently published in the journal Nature details how the fatal fungus Batrachochytrium dendrobatidis (Bd) seems to have first appeared in the Madagascar wild nearly five years ago. The researchers are quick to add that they are unsure how it got there, or even if it wasn’t already there and simply not at endemic levels, but now it can be found in up to 100 percent prevalence in five different major amphibian habitats on the island.
“Representatives of all native anuran (frogs, toads, and other non-tailed amphibians) families have tested Bd-positive, and exposure trials confirm infection by Bd is possible. Bd’s presence could pose significant threats to Madagascar’s unique “megadiverse” amphibians,” the study authors wrote in their report.
This was determined after an international team of researchers examined skin swabs and tissue samples from 4,155 amphibians tested for Bd between 2005 and 2014.
A stunning number of these samples, representing all 500+ species of frogs in Madagascar – representing about seven percent of the world’s total number of amphibian species – tested positive for the fungus.
What subsequent field studies didn’t find, however, was sick frogs. That’s despite Bd epidemics in the rest of the world causing mass-deaths and even extinctions of entire species. A PNAS study published back in 2010 revealed that one forest in Panama even lost 30 species to the fungus over the course of a single year.
