studyguide coral reefs

studyguide coral reefs - CORAL REEFS (GS100) Fall 2010 Dr...

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CORAL REEFS (GS100) Fall 2010 Dr Michela Arnaboldi STUDY GUIDE QUESTIONS WHAT IS A REEF? 1. What are coral reefs? Rock like structures made of calcium carbonate produced by living organisms; 2. Where do you mainly find them? Shallow tropical water environments, often close to the coast 3. What portion of the coral reel is alive? Only the top layer; old shells incorporated into reef structure and contribute to ‘land building’ 4. Over how long of a time span can coral reef develop? Over thousands of years 5. Approximately how much do they cover of the Earth’s surface? .71% of area of our planet; estimated at 1.28 million km2 (91.9%in Indian and Pacific oceans) 6. Why are coral reef important? Remove about 700billion kg of C/yr from the atmosphere; home to huge variety of marine organisms (25%), breeding ground for many fish, 1/3 of all ocean fish live on or depend on coral reefs, protect shorelines from erosion and flooding, used to produce medicines 7. How do coral reefs, coral heads, and polyps compare to cities, apartment complexes, and single people? Can be as tall as buildings; individuals are polyps, and several polyps make up colony (something like that) 8. What is a colony? Several polyps (individual animals) WHAT IS A CORAL? 1. What is a coral? Animal which may live w/ a plant and makes mineral based skeleton 2. What is the taxonomic classification (phylum, class, subclass, order) of stony corals? Phylum – Cnidaria; Class – Anthozoa; Subclass – Hexacorallia; Order - Scleractinia 3. What are Octocorallia? Organisms that belong to class anthozoa and have 8 tentacles 4. What are Hexacorallia? Organisms that belong to class anthozoa and have 6 tentacles or multiples 5. What is the difference between Octocorallia and Hexacorallia? 8 vs. 6; octorallia have internal skeletons and don’t build reefs (are also found worldwide, not just in tropical areas); don’t have zooxanthellae (algae) 6. What are coral polyps? Soft-bodied, invertebrate animals of which hundreds and thousands make up a coral reef 7. How is their body organized (symmetry, mouth, etc)? Radially symmetrical and tubular body w/ tentacles surrounding mouth at upper end; each polyp’s body wall consists of two layers of cells 8. How are the individual poyps connected to each other within the coral colony? Interconnected by gastrovascular canals 9. What is a corallite? The base of the polyp a skeleton is built called a corallite 10. What are nematocysts? The polyp’s tentacles that trap prey using stinging cells 1
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called nematocysts 11. What are hermatypic corals? Produce reefs, found only in tropical regions, have zooax 12. What are ahermatypic corals? No produce reefs, found worldwide, no zooax 13. What is the difference between hermatypic and ahermatypic corals? 14. What are zooxanthellae? What are dinoflagellates?
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This note was uploaded on 11/30/2010 for the course GEOSCI 100 taught by Professor Finarelli during the Spring '09 term at University of Michigan.

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studyguide coral reefs - CORAL REEFS (GS100) Fall 2010 Dr...

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