Aquatic ecosystem stressors in the delta slideshow


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"Stressors" are those factors that can harm native species, and the Delta has a long list of them, including agricultural and urban discharges, invasive species, altered flows, loss of habitat, and of course, water diversions. The PPIC report, Aquatic Ecosystem Stressors in the Sacramento-San Joaquin Delta, focuses on organizing these multiple stressors in a useful way for setting and discussing Delta environmental policy.

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Aquatic ecosystem stressors in the delta slideshow

  1. 1. ECOSYSTEM STRESSORS IN THE DELTA: MORE THAN JUST FLOW A slideshow Free Powerpoint Templates Page 1 Photo by Chris Austin
  2. 2. This slideshow accompanies the article, “Ecosystem stressors in the Delta: It’s more than just flow” from Maven’s Notebook. The slideshow and article are based on the PPIC report,Aquatic Ecosystem Stressors in the Sacramento San-Joaquin Delta. Free Powerpoint Templates Page 2
  3. 3. The PPIC report, Aquatic Ecosystem Stressors in the Delta, categorizes the Delta’s multiple stressors into 5 categories: 1. Discharges 2. Fisheries Management 3. Flow Management 4. Invasive Species 5. Physical Habitat Loss or Alteration Free Powerpoint Templates Page 3
  4. 4. 1. DISCHARGES (1 of 3) Agricultural discharges from both within and upstream of the Delta can add salts, fertilizers, herbicides, pesticides, nitrates, and other dissolved solids to the Deltas waterways.Drainage ditch in the Delta Free Powerpoint TemplatesPhoto by Chris Austin Page 4
  5. 5. 1. DISCHARGES (2 of 3) Municipal discharges can includesalts, metals, pharmaceuticals, and personal care products. Outfall from municipal wastewater treatment plant Free Powerpoint Templates (Photo by Brett Baker.) Page 5
  6. 6. 3. DISCHARGES (3 of 3) Stormwater can contain fertilizers, herbicides,pesticides, petroleum products and heavy metals. Free Powerpoint TemplatesMunicipal stormwater outfall in the Delta Photo by Page 6 Chris Austin
  7. 7. 2. FISHERIES MANAGEMENT Hatchery operations havesustained fisheries for decades, but at the expense of wild populations. Free Powerpoint Templates Page 7
  8. 8. 3. FLOW MANAGEMENT (1 of 2) Upstream dams impound water for water supplies and floodmanagement, changing the flows intothe Delta and eliminating much of the historical variability to which native species were well-adapted. Free Powerpoint Templates Page 8
  9. 9. Harvey Banks Pumping Plant(State Water Project)Photo by Chris Austin 3. FLOW MANAGEMENT (2 of 2) The pumps in the south Delta pull the water from the north, altering flows by introducing cross-Delta and even net reverse flows in some Delta channels. Jones Pumping Plant (Central Valley Project) Free Powerpoint Templates Photo by Chris Austin Page 9
  10. 10. 4. INVASIVE SPECIES (1 of 2) More than 200 non-native species have been introduced, both intentionally and accidentally. Once established in an environment free from natural predators and competitors, non-native species can become aggressive invaders and cost millions of dollars. Geukensia demissa A group of Diadumene lineata on a rock Asian Clam Ficopomatus enigmaticus Chinese mitten crab Spartina Free Powerpoint Templates HydrillaWater Hyacinth Page 10
  11. 11. 4. INVASIVE SPECIES (2 of 2)Invasive plants can clog the Deltas waterways, making it difficult for water operations, boaters and native species. Free Powerpoint Templates Page 11
  12. 12. 5. PHYSICAL HABITAT LOSS ORALTERATION (1 of 2)New equipment, suchas Holt Steamer No.77, helped earlysettlers reclaim theDelta for agriculture.Land reclamationbegan in the 1850s andwas largely completeby the 1930s. Free Powerpoint Templates Page 12
  13. 13. 5. PHYSICAL HABITAT LOSS OR ALTERATION (2 of 2) With 95% of the Delta’s original tidal marsh and floodplain habitat converted to agricultural and other land uses after reclamation, loss or alteration of physicalhabitat is an underappreciated stressor in current debates over the Delta ecosystem, the report says. Free Powerpoint Templates Page 13
  14. 14. For more information:Ecosystem Stressors in the Delta: More than just flow from Maven’s Notebook This slideshow is based on the PPIC Report,Aquatic Ecosystem Stressors in the Sacramento-San Joaquin Delta Free Powerpoint Templates Page 14
  15. 15. Slideshow by Chris Thank you for looking! Free Powerpoint Templates Page 15