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Published byEzequiel Tansley Modified over 10 years ago
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- Environment - Climate - Landscape - Land use - Local Population (animals and humans) Depends on…
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We all need oxygen! Oxygen mixes with water in streams, rivers and oceans Waterfalls, rapids, waves High Oxygen = Healthy Ecosystem
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Fertilizer Run-off Sewage Decaying plants Temperature Increase Tumbling over rocks, rapids and waterfalls Water mixed by waves and wind Aquatic plants and algae Temperature decrease
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Measurement of relative acidity Ranges from 0 to 14 Below 7 are acidic Above 7 are basic At 7 are neutral Influenced by: Type of rocks and soil that it flows through Reacts with alkaline soils and minerals
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Acid Precipitation Mine Drainage Industrial Waste Decaying Plants Water flowing through alkaline soils and minerals Rapidly growing plants and algae Industrial wastes
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Form of Nitrogen= fertilizer for plants Streams normally have low levels of Nitrates Elevated Nitrate levels can cause: Excessive plant growth-> Large amounts of decay use up oxygen -> Fish and animals suffocate EUTROPHICATION Unsafe drinking water
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Natural water has very low levels Fertilizer run-off Wastewater from sewage treatment plants
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Salinity is the amount of dissolved salts in water Distribution of plants and animals depends on salinity Freshwater life= low/no salt 0.5ppt Brackish water= mix of salt and fresh Saltwater life= higher levels of salt 35 ppt
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Fresh water has very low levels Sea water Tides mix salt water with freshwater Run-off from road salt
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Affects: Amount of Dissolved Oxygen Rate of photosynthesis Sensitivity of organisms- small changes can cause death for some animals Thermal pollution- adding warm water to river Industries use water to cool machines and warm water goes back into river
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Ground water Shade Sunlight reaches the water Industry and power plants Run-off from warm buildings and parking lots
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Chemical testing: Dissolved oxygen pH Nitrate Salinity Take a Sample Add Testing Tabs Compare Results
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Macroinvertebrates = aquatic insects, worms and crustaceans Can be used to determine water quality Some can only live in clean water Some can live in polluted water
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