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Fish & Aquatic Life: Sensitive Amphibians

Richness of amphibian species in three forest types 

 
Source:  H. Welsh, U.S.F.S. - PSW Redwood Sciences Lab, Arcata, CA 

This graph shows that late seral forests (old growth) contain significantly more amphibian species than either second growth or mixed second growth and grassland.  At half the 14 sites in late seral forests, an average of three and a half to four and a half species were found. In second growth, half of the 8 sites had between two and three species, while in mixed second growth and grassland, half the 9 sites had an average of about one half to two species. Data is from research conducted by the herpetology group at the USFS Redwood Sciences Lab which is awaiting publication.  

Graphs and photographs from Dr. H. H. Welsh, Redwood Sciences Lab

From the Mattole River Basin:    

Richness of amphibian species in 3 forest cover types (47 KB)

Air temperatures vs. distance from stream for three forest types (45 KB)

Abundance of Black Salamanders in perennial and intermittent streams (40 KB)

From regional studies:

Number of tailed frogs plotted against age of forest and air temperature (45 KB)

Abundance of So. torrent Salamander vs. % canopy (35 KB)