AmphibiaWeb provides information on amphibian declines, natural history, conservation, and taxonomy.

Species of the Week:
Rana cascadae

Amphibian News
Rana cascadae is in decline throughout much of its range, and its near extirpation in the Lassen Peak region of northern California was an early example of the general decline of amphibians that has attracted so much attention. Piovia-Scott et al. (2015) studied the relationship of the chytrid pathogen (Batrachochytrium dendrobatidis, Bd) to juvenile survival of R. cascadae in a lake in the Klamath Mts., and a lake in the southern Cascade Mts., northern California. In the first site, Section Line Lake, abundance of juvenile frogs declined by more than 99% between 2009 and 2012, and Bd was 5 times as prevalent as in the other lake, where no clear trend was recorded. Lab experiments showed that the virulence of Section Line Lake Bd was much greater than isolates from other lakes, and genomic differences were also recorded. The study highlights the significance of local processes in host-pathogen dynamics and population declines.

Current number of amphibian species: 7,430 (Jul 7, 2015) Newly added species