Range
The precise historic distribution of Syncaris pacifica is not known, since geologic and climatic changes since the early Quaternary Period have significantly altered river courses of the Northern California coast. Historically, Syncaris pacifica may have occurred as far north as the Klamath River, but reductions of habitat, especially from overgrazing of cattle, along with chemical water pollution has greatly diminished the present range to 17 stream segments in Sonoma, Napa and Marin Counties. These habitat stream segments are sometimes separated by degraded portions of a given creek, effectively leading to a fragmented population. Occurrence is restricted to perennial streams below 100 meters above sea level in elevation and of gradient less than one percent. The stream segments can be grouped as follows:
- Certain stream segments which drain directly to the Pacific Ocean, including Tomales Bay, in Marin and Sonoma Counties
- Sonoma Creek, lower Napa River, Tolay Creek and Petaluma River, all of which drain to the San Pablo Bay
- Certain lower tributaries of the Russian River including the Laguna de Santa Rosa and certain of its tributaries such as Blucher Creek
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