Global warming increases sex reversal in agile frogs, reducing reproductive success and increasing ranavirus vulnerability, potentially accelerating population decline and extinction.
NEWS: A new study in Science Advances reveals global warming increases sex reversal in frogs, driving population skew and extinction risk.
ABOUT
Focus Species -> Agile frogs (Hungary) where excessive heat during tadpole stage overrides genetic sex determination.
MECHANISM & MATING DEFICIT
- Heat Impact -> Excessive heat -> Genetically female tadpoles turn into fertile physical males.
- Wild Mating Deficit -> Sex-reversed males made up 20% of wild breeding males -> sired only 4% of egg clutches.
- Offspring Impact -> 61% of offspring from sex-reversed males underwent sex reversal vs 17% from normal males.
DISEASE & EXTINCTION RISKS
- Ranavirus Vulnerability -> Heatwaves + Ranavirus infection -> sex-reversed males carried higher viral loads.
- Accelerated Extinction -> Lower reproduction + heat reversal + ranavirus mortality -> population decline 10 years earlier -> extinction 9.5 years sooner.
- Global Context -> 40% of amphibian species face extinction risk -> most threatened vertebrates globally.