Food Web Changes in the Delta Species assemblages

Food Web Changes in the Delta Species assemblages dominated by natives Robust populations at all trophic levels Habitat • Decreased & degraded habitat v aquatic v intertidal v riparian v floodplain v uplands Living Resources • Change in species assemblages v increase in non-natives v decrease in natives Water • Quality: changed nutrients temperature & salinity levels, new toxic chemicals, decreased sediment • Quantity: Less freshwater input, altered timing and duration of river flows, increased Delta outflow Historic (post. European) Conditions Abundant, high quality habitat Ecosystem Processes • Climate change • Decreased sediment & nutrient input (from upstream dams) • Decreased soil accretion • Decreased wetland/floodplain inundation • Increased predation on native species More pollutants Impacts from nonnatives Many native species declining or imperiled, Less habitat, severely degraded in some cases Drivers of change Current Conditions

Habitat • Restored & improved habitat v aquatic v intertidal v riparian v floodplain v uplands Living Resources • Change in species assemblages v increase in non-natives v decrease in natives Water • Quality: changed nutrients temperature & salinity levels, new toxic chemicals, decreased sediment • Quantity: Less freshwater input, altered timing and duration of river flows ? Ecosystem Processes • Climate change • Decreased sediment & nutrient input (from upstream dams) • Increased wetland/floodplain inundation (due to habitat restoration) Predicted Future drivers of change Unknown Future Conditions

Food Web Components of the Delta Historic (post. European) Conditions Habitat • Decreased & degraded habitat v aquatic v intertidal v riparian v floodplain v uplands Living Resources • Change in species assemblages v increase in non-natives v decrease in natives Water • Quality: changed nutrients temperature & salinity levels, new toxic chemicals, decreased sediment • Quantity: Less freshwater input, altered timing and duration of river flows, increased Delta outflow Ecosystem Processes • Climate change • Decreased sediment & nutrient input (from upstream dams) • Decreased soil accretion • Decreased wetland/floodplain inundation • Increased predation on native species Drivers of change Current Conditions