Wine Country (California) - Ecology

Ecology

A diversity of aquatic and terrestrial organisms populate the Wine Country and its riparian zones. Winter-run Chinook salmon (Oncorhynchus tsawytscha), Delta smelt (Hypomesus transpacificus) and steelhead (Onchorhynchus mykiss) are the most prominent fishes. Anadromous fish movements in Sonoma Creek and the Napa River as well as the Laguna de Santa Rosa have been studied extensively not only in the mainstems, but in many of the tributaries. These investigations have demonstrated a historical decline in spawning and habitat value for these species, primarily due to sedimentation and secondarily to removal of riparian vegetation since the 19th century.

A variety of salamanders, snakes and frogs are also present in the Wine Country. The federally listed as threatened California red-legged frog is present in the northern reach draining the south slopes of Annadel State Park. Several endangered species (mostly associated with the Napa Sonoma Marsh) present include California clapper rail (Rallus longirostris), California Black Rail (Laterallus jamaicensis), California brown pelican (Pelicanus occudentalis), California freshwater shrimp (Syncaris pacifica), Salt marsh harvest mouse (Reithrodontomys raviventris ), Suisun Shrew (Sorex ornatus sinuosus), Sacramento splittail (Pogonichtys macrolepidotus). The above are endangered species with the exception of the splittail, steelhead and black rail, which species are federally designated as Threatened.

Upland ecosystems drained include mixed California oak woodland, chaparral and savannah woodland. In these upland reaches one finds plentiful Black-tailed Deer, coyote, skunk, raccoon, opossum, wild turkey, turkey vulture, red-tailed hawk and occasionally bobcat and mountain lion. Prominent higher elevation trees include: Coast live oak, Garry Oak, Pacific madrone, California Buckeye, Douglas fir, whereas Valley oak is prevalent on the Wine Country valley floors.