1. Modified from DRERIP Foodweb Conceptual Model (Durand 2008) SF Estuary Aquatic Food Web Water Habitat Food web drivers Ecological processes Zooplankton Benthic invertebrates Plankton-eating Fish Piscivores Phytoplankton Organic carbon Terrestrial & aquatic plants Primary producers Secondary producers Living Resources

2. Modified from DRERIP Foodweb Conceptual Model (Durand 2008) SF Estuary Aquatic Food Web Water Habitat Food web drivers Ecological processes Zooplankton Benthic invertebrates Plankton-eating Fish Piscivores Phytoplankton Organic carbon Terrestrial & aquatic plants Primary producers Secondary producers Living Resources

3. Modified from DRERIP Aquatic Foodweb Conceptual Model (Durand 2008) Water Quality nutrients temperature salinity, turbidity dissolved oxygen toxic contaminants Water Quantity hydrological conditions water diversions Habitat wetland extent watershed extent geomorphology Food web drivers Ecological processes water velocity residence time water depth stratification Zooplankton Benthic invertebrates Plankton-eating Fish Delta smelt longfin smelt Chinook salmon Phytoplankton Organic carbon detritus from Estuary and upstream Terrestrial & aquatic plants Primary producers Secondary producers Living Resources Terrestrial invertebrates Insectivores fish birds mammals reptiles & amphibians Top predators / piscavores fish birds reptiles amphibians mammals humans SF Estuary Food Web – Aquatic and Terrestrial linked

4. SF Estuary Food Web – bird detail Modified from DRERIP Aquatic Foodweb Conceptual Model (Durand 2008) Water Quality nutrients temperature salinity, turbidity dissolved oxygen toxic contaminants Water Quantity hydrological conditions water diversions Habitat wetland extent watershed extent geomorphology Food web drivers Ecological processes water velocity residence time water depth stratification Zooplankton Benthic invertebrates Plankton-eating Fish Delta smelt longfin smelt Chinook salmon Phytoplankton Organic carbon detritus from Estuary and upstream Terrestrial & aquatic plants Primary producers Secondary producers Living Resources Terrestrial invertebrates Insectivores fish birds mammals reptiles & amphibians Top predators / piscavores Birds, e.g. herons, egrets, cormorants Fish, e.g. striped bass, centrarchids