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Impacts of dredging on Seagrass
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Impacts of dredging on Seagrass

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  • 1. Impacts Of Dredging On Sea grasses Mohammed Al Eid 0910659
  • 2. Contents  What Is Sea Grass?  Where Is Sea Grass In The World?  Where Does Sea Grass Grow?  Types Of Sea Grasses And Their Location  What Are The Threats To Seagrass  Dredging  The Uses Of Dredging  The Impact Of Dredging On Environmentally And On Sea Grass.  Conclusion
  • 3. What Is Sea Grass?  Flowering plants adapted to marine habitats.  Ribbon-shaped leaves  The only true flowering plants that can live completely underwater.  Provide food and habitat for many creatures such as juvenile sea turtles, manatees, crabs, shrimp, and a variety of juvenile fishes.
  • 4. Where Is Sea Grass In The World?  Seagrass beds cover less than 10% of the world's shallow coastal waters, but are important nursing grounds for commercial fish species  Greatest diversity: Indo-Pacific region  Located along the coast of all continents except Antarctica
  • 5. Where Does Sea Grass Grow?  Must be fully submerged  Require saltwater to grow  Thrive in warm temperatures: 20-30 C  Require light for photosynthesis  Grow in shallow, coastal waters  Root system needs a stable softbottom habitat
  • 6. Types Of Sea Grasses And Their Location Johnson’s grass star grass manatee grass widgeon grass shoal grass Turtle grass Paddle grass
  • 7. Location of Sea Grass Types  Turtle- Florida, Caribbean, Bermuda, area between Gulf of Mexico and Venezuela  Manatee- Florida, Bermuda, Bahamas, Gulf of Mexico, Caribbean  Shoal- North Carolina, along the Atlantic, coast of Gulf of Mexico, Caribbean  Johnson’s- Indian River Lagoon  Paddle- near Indian River Lagoon, Gulf of Mexico, Caribbean, IndoWest Pacific  Star- Florida, Bahamas, Texas, West Indies  Widgeon- Atlantic coast (New Found land-Texas)
  • 8. What Are The Threats To Seagrass  Various human activities threaten the health of sea grass ecosystems: 1. Pollution from agricultural and industrial sources. 2. Disposal of mining wastes. 3. Overfishing—disruption of ecological interactions. 4. Sediment movement from boat propellers. 5. Dredging of harbors, ports And shipping lanes.
  • 9. Dredging  Dredging is an excavation activity or operation usually carried out in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often used to keep waterways navigable. It is also used as a way to replenish sand on some public beaches, is also used as a To establish and maintain navigation channels and harbors of sufficient size to accommodate shipping vessels.
  • 10. The Uses Of Dredging  Capital: dredging carried out to create a new harbor, berth or waterway, or to deepen existing facilities in order to allow larger ships access  Construction - the removal of materials previously undisturbed to facilitate new navigation channels or water projects, e.g., locks and dams.  Maintenance - The periodic and repetitive removal of accumulated sediment from navigation channels and harbors to maintain authorized depths and widths
  • 11. The Impact Of Dredging On Environmentally And On Sea Grass.  Reduction in water clarity both from increased turbidity and increased nutrient loading.  Physical removal or burial of the vegetation and the indirect effect of increasing sedimentation  Release of toxic chemicals (including heavy metals and PCB) from bottom sediments into the water column.  Short term increases in turbidity, which can affect the amount of light penetrate which affect aquatic species metabolism and interfere with spawning.  Dredging may affect the physical environment by changing the bathymetry, altering current velocities and wave conditions  Disturbance of the substratum  Possible contamination of dredge spoils sites  Changes to the topography by the creation of "spoil islands" from the accumulated spoil  Dredging could cause a Reduction of the dissolved oxygen
  • 12. Conclusion