Overview
- Recordings of 35 male Sierra chorus frogs at three water temperatures showed call rates rose while individual calls shortened as water warmed.
- Body size, mass, and condition did not account for the changes in calling, indicating temperature was the primary driver.
- Females respond to the quicker tempo, treating it as a signal that conditions favor egg survival and tadpole development.
- Researchers note an approximate 8°C cutoff below which a related species did not mate, identifying a key boundary for reproduction.
- Earlier pond warming linked to climate change is bringing on the rapid calling sooner, advancing egg‑laying and heightening risks for a group with about 41% of species threatened.