Environmental Science 20 Unit 3: Aquatic Ecosystems Review Part A: Vocabulary Salinity Wetlands Plankton Marsh Nekton Swamp Benthos Bog River Mouth Ecology Turbidity Species Transparency Population Detritus Ecosystem Productivity Metabolic rate Benthic Zone Tides Eutrophication Euphotic Zone River Source Aphotic Zone River Course Littoral Zone Estuary Biotic factors Mesotrophic Habitat Index Species Niche Keystone Species Respiration Abiotic factors Oligotrophic Part B: Short Answer Questions 1. What are three important functions of wetlands? Filters absorbs and removes pollutants from water, control flooding by absorbing extra water, provide home for large biodiversity 2. What is a coral reef made of? Why does it need sunlight to survive? Where is Coral Reefs usually found? Accumulated skeletons of coral polyps. It has a mutualistic relationship with algae. Usually found along the shore, in shallow waters, close to the equator. 3. What is a tide? What happens during high and low tide? When do they occur? Rise and fall of sea levels, low tide water recedes away from the shore( occurs when water closest to the moon), high tide water comes into the shore (occurs when water is farthest from moon) 4. What are geophysical properties and list 5 of these properties? Abiotic factors Temperature, turbidity, speed, depth, nature of bottom 5. Describe the relationship between temperature and dissolved oxygen. Warmer water holds less dissolved oxygen then cold water, triggering higher plant growth and respiration rates. 6. What is respiration and give the equation. When animals use oxygen to burn up foods Glucose + oxygen → CO2 + H20 + Heat 6. How does temperature affect respiration? Warmer water, increase plant growth which increase respiration rate. 7. What is thermal pollution and describe 5 sources of thermal pollution? Source of water temperature warming. Power plants, paper mills discharge water into bodies of water. Rainwater running over warm surfaces, removing of shade over water, eroding soil causes turbid water, sediment build-up makes stream/rivers shallow heating water up 8. What is turbidity and list biotic causes, abiotic causes? Know sources of turbidity. Amount of cloudiness in a body of water Low- clear, High- cloudy, Biotic causes: living organic matter, Abiotic- dead organisms, sewage, clay 9. List three chemical properties of freshwater ecosystems. Oxygen, pH, CO2 10. What are the four factors that affect the amount of dissolved oxygen in water? Number of Organisms, Dgree of activity, water temp, pollutants 11. What is the pH range for well-balanced fish population? Between 6.7 - 8.6 12. What five organisms are index species? Algae, bacteria, zooplankton, fish, bottom fauna 13. Give two examples of keystone species, describe why they are. An organism that is crucial to the way other species interrelate. The removal would drastically affect the ecosystem. Sea star- eat mussels if there are too many mussels in crowds out other species. Ivory tree coral- home for many invertebrate species which provide food for larger fish 14. Briefly describe what happens in an algal bloom. Sewage, manure, farm run-off Adds nutrients, this causes algae to grow very quickly, forming an algal bloom. Algae are food for other organisms produce 02, when they die bacteria feed on them and use up oxygen that fish and other organisms need to survive. 15. Label the light zones in an ocean and be able to describe where the energy comes from for each. Littoral Zone- shallow zone in a freshwater where light reaches, locate along the shore. Capture solar energy to make their own food during photosynthesis. Benthic Zone- is a dark region deep underwater. Located at the bottom. No photosynthesis, food source is dead and decaying organisms that sink into this zone. 16. Fill in the table below Water Temperature Dissolved Oxygen Respiration How does increasing turbidity affect it? (Explain your answer!) Increases temp Decreases Decreases Particles absorb heat from sun Due to warmer water Less oxygen How does thermal pollution affect it? (Explain your answer!) Increase water temp Hold less oxygen due to warmer temp Less oxygen How does water speed affect it? Slow has warmer temp Slow has less oxygen Slow has less oxygen How does water depth affect it? Deeper water Cooler temp Deeper water Less plants, less oxygen Deeper water Less plants Less oxygen Less respiration