Researchers track chytrid in mountains of Cameroon
Africa’s frogs may also be succumbing to the chyrid fungus that has wiped out species around the world, researchers reported this week in the journal PLOS ONE.
Tracking frogs on Cameroon’s Mount Oku and Mount Manengouba over a span of more than 12 years, University of Florida herpetologist David Blackburn and colleagues at the Museum für Naturkunde in Berlin have linked declines of at least five frog species linked with chytrid — possibly exacerbated by habitat destruction, pollution and climate change.
“There’s been this perception that frogs in Africa are not affected by chytrid at all, but we have evidence of the disease in some animals,” said Blackburn, co-author of the new study. “This is the first real case of a decline across multiple amphibian species in Africa.”
Study scientists collected and documented abundance and diversity of frog species living on the two mountains before and after the emergence of the amphibian-killing fungus in the area between 2008-2010.
Blackburn said many of the once common species, like the bright red Cardioglossa manengouba, a frog he discovered and named during graduate fieldwork in the early 2000s, are now scarce and nearly impossible to find.
“It’s looking like some of these frogs may not be around by the time my kids are old enough for me to take them to Cameroon to see them,” he said.
While chytrid is to blame for most of the patterns of decline in frogs worldwide, Blackburn said scientists have linked the fungus to climate change, which may drive the emergence of chytrid in some places.
In studies exploring declines of amphibians in Latin America, University of South Florida herpetologist Jason Rohr has shown that unpredictable climate fluctuations associated with climate change can increase chytrid-related die-offs.
“Our research has shown there may be an underappreciated link between climate change, disease and biodiversity losses,” Rohr said. “Global warming and the severity of unpredictable variations in temperature increase chytrid growth on amphibians.”
Blackburn said extreme temperature changes may affect the biology of the frogs by making them more, or less, susceptible to pathogens. He said this could easily be a factor in Cameroon, though he and colleagues have not yet collected enough data to make that call.
In captivity, frogs with chytrid are treated with an effective fungicide bath. In the Sierra Mountains of California, scientists have successfully released frogs inoculated with bacteria that make them less vulnerable to chytrid. But these methods are less practical in the mountains of Cameroon.
“Even if a cure was found, it would be hard to inoculate all of the individual frogs out there,” Backburn said. “Promoting a healthier environment in general for Africa’s amphibians in terms of water quality and habitat protection is our best shot for keeping these species around.”