Reefs Formation and Growth I. The Environment of the Reef Nutrient supply: 1.Oligotrophic environment- nutrient poor Shallow waters where most reefs develop.

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Presentation transcript:

Reefs Formation and Growth I

The Environment of the Reef Nutrient supply: 1.Oligotrophic environment- nutrient poor Shallow waters where most reefs develop Low abundance of food Hermatypic corals need symbiont 2.Eutrophic- nutrient rich Dominated by phytoplankton production Reduces light for coral symbiont Not necessarily beneficial

Oligotrophic vs Eutrophic

Limiting factors for reef development: 1.Temperature o C 2.Light Symbiont Corals thrive in shallow waters where light intensity is the strongest Hermatypic corals <30m 3.Salinity Ave 35 ppt ppt; corals have a difficult time developing at extreme salinity

Framework Building Sediment Production Cementation

Scleractinian Corals Non-Scleractinian Corals Coraline Algae

Scleractinian Coral Framework Builders

Non-Scleractinian Coral Framework Builders fire coral

Coralline Algae Framework Builders

Other Framework Builders giant clam

Fragmented Coral and Coraline Algae Foraminifera Skeletons Halimeda “Dust” Sponge Spicules Other Skeletal Debris Inorganic Precipitation

Reef Sediments: Foraminifera

Reef Sediments: Halimeda Sand Reef Sediments: Halimeda Sand Reef Sediments: Halimeda Sand

Reef Sediments: Sponge Spicules

Reef Sediments: Other Skeletal Remains cone shell

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