Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: > 300
Comments: Presumed extant in several hundred sites (USFWS 2004); likely there are a smaller number of distinct occurrences (discrete populations). In the Los Vaqueros watershed, Contra Costa County, Alvarez (2004) found this species in 66 of 90 stock ponds.
The Santa Barbara County distinct population segment occupies six habitat complexes with 27 documented breeding sites; these represent six metapopulations (USFWS 2000).
Sonoma County distinct population segment: currently there are 8 known breeding sites (USFWS 2003).
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