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Chapter 10 RAD Guide

Chapter 10 RAD Guide. November 29, 2010. What is the difference in how aquatic biomes are grouped vs. terrestrial biomes?. Aquatic biomes are determined by their depth. What are the two most important characteristics used to describe aquatic biomes?. Amount of dissolved salts

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Chapter 10 RAD Guide

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  1. Chapter 10 RAD Guide November 29, 2010

  2. What is the difference in how aquatic biomes are grouped vs. terrestrial biomes? • Aquatic biomes are determined by theirdepth

  3. What are the two most important characteristics used to describe aquatic biomes? • Amount of dissolvedsalts • Depth of water

  4. How issalinitydetermined & measured? • Salinityisdetermined by density of the water • Measured in parts per thousand

  5. Whatisbrackish water? • Water that’s more saline thanfresh water, but less saline thanocean water

  6. Name & describe each depth zone. • Photic Zone = receives sunlight • In ocean, up to 200m deep • Aphotic Zone = belowphotic; does not receiveany light • Only in ocean & verydeeplakes • Benthic Zone = oceanfloor • Supports microscopicdecomposers and scavengers

  7. VOCABULARY! • Salinity: the amount of dissolvedsalts in a sample of water • Photic Zone: • Benthic Zone: See notes above for definition!

  8. Describe what a standing-water ecosystem is & provide 3 examples. • Ecosystemwherethereislittle net flow in or out of the ecosystem • Lake • Pond • Marsh • Swamp • Bog Wetlands

  9. How does the flow of water circulating in a standing-water ecosystem help? • Helps to distributewarmth, oxygen, and nutrients

  10. Describe the levels of habitat in a standing-water ecosystem & provide examples of organisms. • Top Level: Photic Zone • Where sunlight hits • Examples: Phytoplankton & Zooplankton • BottomLevel: Benthic Zone • Sunlight does not hit • Examples: Scavengers

  11. How are phytoplankton and zooplankton different? • Phytoplanktoncanmaketheirownfood (photosynthesis) and zooplanktoncannot

  12. What is a wetland & why are wetlands so important to the biosphere? • Ecosystems in which the roots of plants are submergedunder water • Act as filtersthatdetoxifychemicals in water

  13. Why are the wetlands being destroyed by human activity? • Not attractive • Breeding grounds for mosquitoes • Smell • Property (homes, farmland) • Can beused for space for a land-fill • Think Florida Everglades!

  14. How have organisms that live in flowing-water ecosystems adapted to their environment? • Have hooksthatallowthem to grab plants • Have suckers to anchorthem to rocks • Examples; algaeeaters & mussels • Fish swimupstream to breed • Examples: Salmon & trout

  15. How do gravity, erosion, & sedimentation affect stream ecosystems? • Gravity: causes streams to flow downhill • Erosion: can cause change in stream direction • Sedimentation: provide place for plant roots to grow & can cause change in stream direction over time

  16. What condition encourages sediments to settle out of the flowing water in stream? • Sedimentssettlewhen the flow slows down

  17. Why are there fewer organisms in the headwater of stream than further downstream? • The water flowstoofast in headwaters

  18. How has the flow of streams been changed by humans? Provide an example. • We change the direction of the stream to benefit us • Examples: dams, irrigation canals

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