1 / 13

Columbia River estuary – overview of physical features and habitats

Columbia River estuary – overview of physical features and habitats. Colin Levings ISAB. Thanks owing to Jen Burke UW and Chris Hathaway LCREP for graphics. What is an estuary? -a semi-enclosed body of water where freshwater and saltwater mix (common usage)

aishaa
Download Presentation

Columbia River estuary – overview of physical features and habitats

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. Columbia River estuary – overview of physical features and habitats Colin Levings ISAB Thanks owing to Jen Burke UW and Chris Hathaway LCREP for graphics

  2. What is an estuary? -a semi-enclosed body of water where freshwater and saltwater mix (common usage) -the entire portion of a river that is influenced by ocean tides (Williams et al 2006 for the Columbia River estuary)

  3. Why should we concerned about physical features of the estuary ? -interacting with biological factors (competition, predation) physical factors influence the distribution, abundance, and survival of fish. John Ferguson and Don Lyons will discuss. Examples -temperature influences growth and food requirements -salinity influences the smolting process when salmon migrate from fresh to salt water -currents and water depth can affect distribution

  4. Regional setting for the Columbia River estuary -water from the largest watershed on the northeast Pacific coast drains through this drowned river valley (map from Emmett et al 2000)

  5. Salinity and tidal influence

  6. Temperatureat Warrendale (from Fuhrer et al 1996) Flow at The Dalles 1901-1950 and 1980-2003 (from Naik and Jay 2005)

  7. Why should we be concerned about wetland habitat in the estuary? Dan Bottom will discuss. -detritus (complex of decaying vegetation and microbes) is recognized as a main source of energy for invertebrates (fish food) supporting estuarine food webs -vegetation area can be measured and used as a surrogate for fish habitat because vegetation is also influenced by physical factors

  8. Historical wetlands

  9. Contemporary wetlands

  10. Cover and bathymetry by mapping

  11. Satellite imagery

  12. Video inventory of shoreline to help plan restoration Wetland Loss – Grays River

  13. LCREP will describe restoration activities

More Related