| Area | Regional |
| Topic | Fish: Presence/Absence of Coho in Central Coast ESU 1999 |
| Caption: This chart shows the findings of field surveys (Adams et al., 1999) to determine the presence or absence of juvenile coho salmon within the Central California Evolutionarily Significant Unit (ESU) where known to harbor coho historically. The ESU extends south of the Mattole River to Santa Cruz, including some San Francisco Bay tributaries. The loss of coho salmon from tributary basins and portions of large rivers shows fragmentation of the distribution of coho, which, according to the authors, is a warning sign for declines toward extinction. Absence data are provisional pending more extensive study, because coho may exist in some streams but only occur in some years or may have resided in other reaches of streams not surveyed. See Info Links for more information. | |
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