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KRIS E. Marin Sonoma: Chart Page

Area Regional
Topic Fish: Presence/Absence of Coho Salmon Central Coast ESU
Caption:  The chart above shows the findings of field surveys (Adams et al., 1999) to determine the presence or absence of juvenile coho salmon within the Central California ESU in streams that were known to harbor coho historically. The ESU extends south of the Mattole River to Santa Cruz, including some San Francisco Bay tributaries. Thirty-six percent of Mendocino streams surveyed lacked coho while 72% of Sonoma streams surveyed lacked coho. The loss of coho salmon from tributary basins and portions of large rivers shows fragmentation of the distribution of coho, which is a warning sign for declines toward extinction according to the authors. Absence data are provisional pending more extensive study, because coho may exist in some streams but only occur in some years. This would be due to complete losses of year classes. See Info Links for more information.

To learn more about this topic click Info Links .
To view additional information (data source, aquisition date etc.) about this page, click Metadata .
To view the table with the chart's data, click Chart Table web page.
To download the table with the chart's data, click adamscohoprabs.dbf (size 462 bytes)
To download the table with the chart's data as an Excel spreadsheet, click adamscohoprabs.dbf.xls (size 4,096 bytes) .