1 / 26

Nutrients Salinity Temperature Turbidity Dissolved Oxygen Chlorophyll

Nutrients Salinity Temperature Turbidity Dissolved Oxygen Chlorophyll. www.sfbay.wr.usgs.gov/access/wqdata. North Bay. South Bay. Story 1: North Bay. USGS + Interagency Ecological Program. Corbula amurensis. Interagency Ecological Program. California Department of Fish & Game.

dot
Download Presentation

Nutrients Salinity Temperature Turbidity Dissolved Oxygen Chlorophyll

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Nutrients Salinity Temperature Turbidity Dissolved Oxygen Chlorophyll www.sfbay.wr.usgs.gov/access/wqdata

  2. North Bay South Bay

  3. Story 1: North Bay USGS + Interagency Ecological Program

  4. Corbula amurensis Interagency Ecological Program

  5. California Department of Fish & Game

  6. Story 2: South Bay Chlorophyll a (mg/L) 1977-1998

  7. Chlorophyll a (mg/L) 1977-2004

  8. Seasonal Kendall Test (Helsel & Hirsch 1992) % per year

  9. Ecologically Important • NOT related to nutrient (N,P) increases

  10. Why is phytoplankton increasing in San Francisco Bay? Four Hypotheses Resources Light Nutrients 1 4 Growth Mortality Impairments Herbicides Metals Transport 2 3

  11. Resources Light Growth 1 Sediment Input (Mt/y) McKee et al. (2006) “sediment yield of the Sacramento River decreased by about half from 1957-2001” (Wright & Schoellhamer 2004).

  12. Growth Impairments Metals 2 City of San Jose, Environmental Services (2006)

  13. Upwelling Intensity Transport 3 NOAA PFEL

  14. Speckled Sanddabs English Sole Mortality 4 California Dept. Fish & Game

  15. Lessons • aquatic ecosystems are in perpetual state of change • unraveling the processes is particularly challenging in estuaries • water quality is influenced by connectivity to the coastal ocean and local watersheds • alien species can be as disruptive as chemical pollution • phytoplankton dynamics are influenced by more than nutrient loadings Thanks to Tara Schraga, Kate Dallas, Alan Jassby, Jan Thompson, Dave Schoellhamer, Kathy Hieb, San Jose Environmental Services, Regional Monitoring Program

  16. Photo: Steve Hager

  17. Chlorophyll varies at time scales from hours to decades

  18. Conceptual Model Resources Light Nutrients Growth Mortality Impairments Herbicides Metals Transport Nancy Monsen

  19. Robin Stewart (USGS): Selenium concentrations in fish Striped Bass White Sturgeon 50 Mean ± SE *** 40 30 * Se conc. (µg/g) 20 10 0 1990 n=25 2000 n=15 1986 n=5 1990 n=10 1999 n=15 1986 n=10 CDFG (data 1986, 1990)

  20. Seasonal Kendall Test for Trends (Helsel & Hirsch 1992) % per year

  21. % per year

  22. Not associated with nutrient increases % per year

  23. Estimated Primary Production (g C/m2-y) 215 120

More Related