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Coral Reefs

Chia sẻ: Le Van Hanh | Ngày: | Loại File: PPT | Số trang:39

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Importance of Coral Reefs: 0.2% of world’s ocean. Habitat for 1/3 of marine fishes. Habitat for tens of thousands of other animals. The rainforests of the oceans. Destruction of other ecosystems upon which coral reefs depend. Possible disruption of reproduction and recruitment.

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Nội dung Text: Coral Reefs

  1. Coral Reefs http://tools.coralreef.org/content/ http://ourworld.compuserve.com/homepages/ objects/view.acs?object_id=545 mccarty_and_peters/coral/C­intro.htm
  2. Importance of Coral Reefs • 0.2% of world’s oceans • Habitat for 1/3 of marine fishes • Habitat for tens of thousands of  other animals • The rainforests of the oceans
  3. Importance of Coral Reefs PROTECTION TO COASTLINES • ECONOMIC RESOURCES • BIODIVERSITY • NATURAL BEAUTY •
  4. Importance of Coral Reefs • PROTECTION TO COASTLINES – absorb energy of ocean waves – reduce erosion of shoreline – storm damage – flooding
  5. Importance of Coral Reefs • ECONOMIC RESOURCES  –Fisheries for food –Fisheries for jobs –Tourism –Building materials –Aquarium trade
  6. Importance of Coral Reefs • BIODIVERSITY –The rainforests of the sea –Genetic diversity –Pharmaceuticals
  7. Importance of Coral Reefs • NATURAL BEAUTY http://sustainableseas.noaa.gov/missions/ florida2/background/coralspawning.html
  8. $375 billion in environmental goods and services Reefs at Risk 1998 (http://www.wri.org/powerpoints/reefswww/sld011.htm
  9. Caribbean reef values (annual net benefits in 2000) • Fisheries: $310 million • Dive tourism: $2.1 billion • Shoreline protection: $0.7­2.2  billion Total: $4.1­4.6 billion
  10. REEFS WORLDWIDE ARE  THREATENED •11% of reefs have been lost •16% of reefs severely damaged •~60% of studied reefs threatened  by human activities •No pristine reefs left
  11. CARIBBEAN REEFS DECLINING •1970s: ~50% coral cover •Present: ~10% coral cover •=80% reduction in coral cover over  last 30 years Gardner et al. 2003 Science 301: 958­960
  12. Threats to coral and  coral reefs: 1) Natural  2) Anthropogenic  –of human origin
  13. Natural disturbances that affect  corals and coral reefs? •Hurricanes •Tsunamis •Volcanoes •Earthquakes •Predators & competitors •Bleaching •Pathogens
  14. Hurricanes • Physical damage •Smothering  •Freshwater poisoning http://www.nhc.noaa.gov/ 1989hugo.html •Destruction of other ecosystems upon  which coral reefs depend
  15. Tsunamis • Physical damage  •Erosion •Possible disruption of  reproduction and recruitment
  16. Volcanoes • Depends upon  where volcano  occurs •Heat •smothering and  sedimentation http://volcano.und.nodak.edu/vwdocs/ current_volcs/montserrat/montserrat.html
  17. Earthquakes • Little direct impact  •Indirect impacts ­triggers tsunamis ­coastal landslides
  18. Predators crown of thorns starfish  • snails • parrotfish • butterflyfish • http://www.aims.gov.au/pages/reflib/ cot­starfish/pages/cot­q07.html http://www.sanctuaries.nos.noaa.gov/pgallery/pgflower/living/fg_living.html
  19. Competitors • algae http://catbert.er.usgs.gov/african_dust/algae.html
  20. • Loss of  zooxanthellae • causes  –  higher than usual  ocean temperature  –  sharp changes in  salinity http://ourworld.compuserve.com/homepages/ mccarty_and_peters/coral/Bleach.htm – heavy UV light  exposure
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