From Arizona State University. Nice site since the material is presented at various levels for both older and younger children. Ecosystems Correlation is VA SOL 7. Biological Productivity in the Oceans Information on marine food chains starting with photosynthesis and plankton. Ecology Sample lesson plans on food chains.
Food Chain Uses the sun, a field of grass, a rabbit and a fox to explain the food chain.
Good intro for both older and younger students. Rabbit Calcivirus Runs Rampant From Heinemann. Discusses effects of the spread of the calcivirus which has killed millions of rabbits in Australia. Effect on food web. Text of a series of seminars on wetlands, sponsored by U.S. Global Change Research Information Office.