1. Ecosystems Note series for Environmental Science “Are dynamic complexes of biotic communities and their associated abiotic environments interacting as functional units.” -U.S. Fish and Wildlife Service

2. Composition of Ecosystems Individuals (species) live together in groups called populations

3. Ecosystem Energy Flows http://www.globalchange.umich.edu

4. Earth as a support system Composition of the troposphere http://liftoff.msfc.nasa.gov/academy/space/atmosphere.html

5. http://otn.uoregon.edu/skmiller

6. marine.rutgers.edu

7. Biogeochemical Cycles Cycles on earth including gases… - Oxygen - CarbonCarbon - NitrogenNitrogen Cycles involving solids… - PhosphorusPhosphorus - SulfurSulfur

8. Ecosystem Interactions There are many types of ecosystems in the world with many levels of interactions called “trophic interactions” http://www.globalchange.umich.edu

10. Lake Trophic Interactions

12. Carbon Cycle NYU Image www.cotf.edu/ete/module s/carbon/earthfire.html www.cotf.edu/ete/module s/carbon/earthfire.html

13. Nitrogen Cycle http://muextension.missouri.edu/xplor/waterq/wq0252.htm

14. Phosphorus Cycle http://www.bsi.vt.edu/chagedor/biol_4684/Cycles/Pcycle.html

15. Sulfur Cycle www.agnr.umd.edu/users/agron/nutrient/Factshee/sulfur/Sulfur.html

16. Taken from Garfield.com