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Unformatted text preview: 1 Feb 28: Groundwater and Ecosystems March 2: Sinkholes and Subsidence Quiz 6 PRESENTATION TOPIC DEADLINE ( No reply = no presentation ) : By next Wednesday (March 2), provide a short description (a few sentences) of your presentation topic If you have a preference for date please of your presentation topic. If you have a preference for date, please specify (first come, first choice). Paper or email. Please see the class web page for topics and dates already selected. Groundwater and Ecosystems Percent of total Water Oceans 97.61 Polar ice/Glaciers 2.08 Groundwater 0.29 Freshwater lakes 0.009 Saline lakes Surface freshwater is small percentage of volume, and of earths surface (~1%) but important in terms of 0.008 Soil and subsoil 0.005 Rivers 0.00009 Atmosphere 0.0009 From R.G. Wetzel important in terms of number of species (12% of animals; 40% of fish) Role of isolation: many endemic species (native only to small area) found in surface water Producers Photosynthesis: CO 2 , nutrients, water...
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- Spring '09