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Human Impacts on Coral Reefs. Part 1 Natural Stresses and Human Uses. Factors Correlated with Healthy Coral Reef Growth. water temperature range: 18 – 29  C normal seawater salinity: 32 – 35 ‰ low inorganic nutrient concentrations (oligotrophic waters) clear, transparent water

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human impacts on coral reefs
Human Impacts on Coral Reefs

Part 1

Natural Stresses and Human Uses

factors correlated with healthy coral reef growth
Factors Correlated with Healthy Coral Reef Growth
  • water temperature range: 18 – 29C
  • normal seawater salinity: 32 – 35 ‰
  • low inorganic nutrient concentrations (oligotrophic waters)
  • clear, transparent water
  • little or no sedimentation
  • vigorous water motion
natural sources of stress on coral reefs
Natural Sources of Stress on Coral Reefs
  • intense storms
  • El Niño
  • disease
  • volcanic eruptions
  • predator population explosions
  • natural stream and river runoff
  • exceptionally low tides
impacts of el ni o
Impacts of El Niño

Forest Fires

Drought

Bird life impacted

Marine Life Impacted

Coral Reef Damage

Coastal Erosion

Tropical Storm

Floods

some local human impacts
Some Local Human Impacts
  • thermal effluents
  • sewage discharges and agricultural runoff
  • mechanical damage to reefs
  • sedimentation
  • destructive resource extraction practices
  • introduced species
  • loving a reef to death
global human impacts
Global Human Impacts
  • global warming
  • ozone depletion
  • ocean acidification
possible consequences of stresses and impacts on corals and coral reefs
Possible Consequences of Stresses and Impacts on Corals and Coral Reefs
  • outright mortality of coral tissues
  • breakage of coral colonies
  • bleaching
  • diseases
  • slower growth
  • reduced reproduction and recruitment
  • competitive exclusion by other organisms
  • increased reef erosion
hawaiian fish ponds
Hawaiian Fish Ponds

He'eia fishpond

slide24

Ahupua’a

Ranges from the tip of the mtn to the reef area

  • Upland
  • Plains
  • Ocean
modern uses of coral reefs
Modern Uses of Coral Reefs
  • Seafood
  • Food Additives and Toiletries
  • Health and Medicine Products
  • Research and Education
  • Jewelry and Art
  • Marine Aquarium Specimens
  • New Land
  • Cement & Other Building Supplies
  • Shoreline Protection
  • Recreation