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Ecosystems “Are dynamic complexes of biotic communities and their associated abiotic environments interacting as functional units.” -U.S. Fish and Wildlife Service Note series for Environmental Science Composition of Ecosystems • Individuals (species) live together in groups called populations Ecosystem Energy Flows http://www.globalchange.umich.edu Earth as a support system Composition of the troposphere http://liftoff.msfc.nasa.gov/academy/space/atmosphere.html http://otn.uoregon.edu/skmiller marine.rutgers.edu Biogeochemical Cycles • Cycles on earth including gases… - Oxygen - Carbon - Nitrogen • Cycles involving solids… - Phosphorus - Sulfur Ecosystem Interactions • There are many types of ecosystems in the world with many levels of interactions called “trophic interactions” http://www.globalchange.umich.edu Lake Trophic Interactions Carbon Cycle NYU Image www.cotf.edu/ete/module s/carbon/earthfire.html Nitrogen Cycle http://muextension.missouri.edu/xplor/waterq/wq0252.htm Phosphorus Cycle http://www.bsi.vt.edu/chagedor/biol_4684/Cycles/Pcycle.html Sulfur Cycle www.agnr.umd.edu/users/agron/nutrient/Factshee/sulfur/Sulfur.html Taken from Garfield.com
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