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Historic (post-European) Conditions

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Presentation on theme: "Historic (post-European) Conditions"— Presentation transcript:

1 Historic (post-European) Conditions
Food Web Changes in the Delta Historic (post-European) Conditions Species assemblages dominated by natives Abundant, high quality habitat Robust populations at all trophic levels Habitat Decreased & degraded habitat aquatic intertidal riparian floodplain uplands Living Resources Change in species assemblages increase in non-natives 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 Hover over photo for explanation of key drivers: e.g. less turbidity and associated problems Introduced - Striped bass (1879) and American Shad ( ), largemouth bass 1891 (to california, spread widely), green sunfish (1891) Threadfin shad = 1959 in Sac-San Joaquin drainage Current Conditions More pollutants Impacts from non-natives Many native species declining or imperiled, Less habitat, severely degraded in some cases

2 ? Predicted Future drivers of change Unknown Future Conditions Habitat
Restored & improved habitat aquatic intertidal riparian floodplain uplands Living Resources Change in species assemblages increase in non-natives 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

3 Historic (post-European) Conditions
Food Web Components of the Delta Historic (post-European) Conditions Habitat Decreased & degraded habitat aquatic intertidal riparian floodplain uplands Living Resources Change in species assemblages increase in non-natives 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 Introduced - Striped bass (1879) and American Shad ( ), largemouth bass 1891 (to california, spread widely), green sunfish (1891) Threadfin shad = 1959 in Sac-San Joaquin drainage Current Conditions

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