And for now, there is no smoking gun pointing to a single reason for the decline. That means there’s no easy answer, either, the scientists said, explaining that, across the U.S. there are multiple and geographically diverse factors that play role.
Warming and tainted waters raise threats to wood frog tadpoles
FRISCO — With more than a third of the world’s amphibian species threatened by extinction, scientists have been try to figure out what’s driving the decline. For some species, the chytrid fungus has been pinpointed as the biggest threat, but a study by scientists from California and Alaska shows that climate change and pollution may also be big factors.
Lab tests showed that wood frog tadpoles were attacked by dragonfly larvae 30 minutes sooner and three times more often in warmer water with a slight increase in copper pollution, than in cooler, copper-free treatments. The attacks either killed the tadpoles directly, left them with injuries that could become abnormalities in later life, or increased levels of stress measured by the behavior of other tadpoles in the tanks. Continue reading “Climate change, pollution linked with amphibian decline”→
Voluntary conservation easements would protect habitat and traditional land use
FRISCO — Federal biologists are seeking input on a draft plan to protect habitat for the endangered Wyoming toad. The species was common in the Laramie plains area through the 1970s, when populations crashed, leading to an endangered species listing in 1984.
“I’m so glad these severely endangered frogs will finally get a recovery plan,” said Collette Adkins Giese, a Center of Biological Diversity attorney and biologists dedicated to protecting rare amphibians and reptiles. “Recovery plans really need to be developed soon after species are protected, because they give us a roadmap of exactly what we need to do to ensure those species won’t go extinct.”
There are only nine known populations of the frogs, all living in isolated headwaters streams where they rely on snowmelt and freshwater springs for habitat. Most of the frogs were wiped out by the introduction of non-native trout, and habitat degradation is another factor in their decline. Continue reading “Rare California frogs finally get recovery plan”→
Research suggests some species can develop or acquire an immunity to deadly fungal pathogens
By Summit Voice
FRISCO — Florida-based researchers say they may have some answers for the puzzling wave of amphibian deaths that’s been wiping out populations of some species. At least some frogs and snakes may be able to develop immunity to the deadly chytrid fungus that’s been implicated in the die-off, University of South Florida biologists said this week.