Benthic Communities living along the bottom of the ocean

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  • Benthic Communities living along the bottom of the ocean
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  • Benthic Communities living along the bottom of the ocean
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  • Benthic Communities Rocky Intertidal Zones Coral Reefs
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  • Rocky Intertidal Zones
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  • Hard places to live Drying out during low tide Close shells, move to moist areas Wave Shock Have holdfasts, cement, tube feet Lack of space to hold on competition Rapid changes in temperature & salinity Close shells or be able to withstand it
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  • Table 15.1
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  • Coral Reefs Corals Are animals (Cnidarians) Small (ant-sized) polyps live in large colonies Hermatypic corals secret a calcium carbonate skeletonthe reef
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  • Coral Reefs Zooxanthellae Dinoflagellate that lives within the coral polyp A mutualism Algae provide food, speeds up calcium carbonate deposition & get nutrients in return
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  • Coral Reefs Hermatypic Corals ideal habitat is 5-10 m (16-33 ft) depth & temperatures warmer than 18-21 o C (64-70 o F)
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  • Fig. 14-12, p. 294
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  • Coral Reefs Reefs support a large diversity of other organisms Home to 25% of the worlds marine species
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  • Symbiosis the co-occurrence of two species in which the life of one is closely tied with the life of another
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  • Symbiosis Three types mutualism (++) Anemone fish, cleaner shrimp or wrasse, zooxanthellae commensalism (+0) pea crabs, remoras & shark, whale barnacles parasitism (+-) isopods, roundworms, etc.
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  • Figure 14.15b
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  • Figure 10 p.221
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  • Figure 14.15a
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  • Figure 14.15c