coral reefs coral reefs are similar to rain forests in that they are complex and diverse
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Coral reefs are similar to rain forests in that they are complex and diverseTRANSCRIPT
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Coral Reefs
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Coral Reefs
Coral reefs are similar to rain forests in that they are complex and diverse
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Coral ReefsCoral reefs are made of calcium carbonate CaCO3 deposited by
reef-building organisms like coral.
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Coral Reefs
Coral polyp is a sac like stage of a Cnidarian with mouth and
tentacles on top.
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Coral polyp
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Coral ReefsWhat is a coral colony?
“Founder” coral divides over and over so all are clones that have a connected digestion system and
share a common nervous system. Touch one and they all respond.
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Coral Colony cutaway
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Coral Colony
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Coral Reef What are zooxanthellae? Dinoflagellates that live within animal tissue Have symbiotic mutualistic relationships with
organisms providing food and color• They do photosynthesis and pass on some of
the organic matter to the coral.• Feed coral from inside.• Enable coral to make CaCO3 faster
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zooxanthellae living in a mutualistic relationship with coral
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Five Ways Coral Feed
1.Zooxanthellae are most important source of nutrition
2.Capture zooplankton with stinging nematocysts on tentacles
3.Capture zooplankton with mucus nets4.Digest organic material outside the body
with mesenterial filaments5.Absorb DOM dissolved organic matter
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Coral polyp
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Stinging Nematocysts
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mesenterial filaments
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Encrusting Coralline Algae
• Deposit of CaCO3 (limestone) add to structure of reef
• Forms algal ridge, block waves, prevents erosion
• Cements sediments in place,keeps reef from washing away
• Food source for fish
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Encrusting Coralline Algae
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Encrusting Coralline Algae
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algal ridge
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Coral reproduction
• Sometimes asexual, cloning• Some corals hermaphroditic….. Some
separate sexes • Have mass spawning ex. Great Barrier
Reef between Oct- Nov• Larva is called planula larva
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Budding
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Budding
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coral spawning
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coral spawning
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Life cycle of a coral polyp
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coral spawning
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coral spawning
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Conditions for reef growth
• Shallow clear water• Good light • Warm water- just right • Stable salinity
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Clear Water
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Other Reef Builders:• Oysters
• Polychete worms
• Shells of snails, clams, other mollusks, sea urchins, crustaceans, sponge.