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Yolo/American Basin
Ecoregion
in
Central Valley
,
CA
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The Yolo/American Basin ecoregion includes nearly level to very gently sloping stream channels, levees, overflow basins, and alluvial fans of the main alluvial plain adjacent to the lower Sacramento River. The American Basin, just east of the river, is the northern unit, and the Yolo Basin, just west of the river, is the southern unit. Elevations range from about 10 to 40 feet. Some flooding and high water tables occur during wet winters, although much of the region is protected by artificial levees, dams, and diversions. The Yolo Bypass goes through the region, carrying Sacramento River water at overflow toward the Delta ecoregion (7j). Cropland, hay and pasture land, and herbaceous wetlands cover most of the region, with rice being the most extensive crop. The soil temperature regime is thermic and soil moisture regimes are aquic and xeric. Common vegetation includes annual grasslands and in riparian areas some cottonwood, willow, and sycamore. Emergent vegetation in the permanent wetlands includes cattails, tules, and sedges. The seasonal and permanent wetlands provide resting and feeding habitat for ducks, geese, rails, and songbirds; and foraging habitat for wading birds such as herons, egrets, pelicans and ibis.
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