USDA Forest Service

Pacific Southwest Research Station

Pacific Southwest
Research Station

800 Buchanan Street
Albany, CA 94710-0011
(510) 883-8830
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Mangroves, Sediment and Water: Impacts of Urban Development and Global Change

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About The Presenter

Katie Friday, USDA Forest Service, Pacific Southwest Region


About This Presentation

Running time: 22 minutes and 26 seconds.
Given: September 20, 2006, Mangrove Management Workshop, Palau
Production by: M.J. Furniss and J. Guntle, Communications and Applications, PNW and PSW Research Stations

Topics covered:

  • Mangroves, sediments, and water
  • Mangrove ecology
  • Are mangrove forests expanding?
  • Mangrove ecosystem reinforcement
  • Sometimes forests retreat instead of expand
  • Harvesting and ocean currents
  • Mangrove soils are ever-changing
  • Slumping
  • Which mangroves trap the most sediment
  • Do mangroves protect coral reefs from sediments
  • How do mangroves protect coastlines from waves
  • Density of roots and branches
  • Example: a few strong trees have little effect
  • Width of mangrove along coastline
  • Mangroves removed from coastline- no protection
  • Fill
  • Elevation of fill sites on mangrove
  • Typhoons
  • Sea level changes
  • Unpaved roads and earthmoving
  • Sediment trapping
  • Roads
  • Changes in water circulation
  • Road and causeways may impound water
  • Road
  • Impounding
  • Causeway in Ngatpang, Palau
  • Roads between mangrove and uplands
  • Road
  • Effects of road
  • Effects of rising sea level
  • Mangroves grow toward interior
  • Deeper water mangroves will die
  • Coral reefs and mangroves
  • Old sea level
  • New sea level
  • Summary of management recommendations