11 ECOLOGICAL PYRAMIDS -Used to show relationships among trophic levels of food chains.
12 WHAT USUALLY DECREASES AS YOU GO UP THE PYRAMID? 1. Number of organisms - More blades of grass than rabbits, more rabbits than foxes.2. Biomass - Total dry weight of organisms at each level of the pyramid.Energy - energy is lost as you move up the pyramid due to metabolism of the plant /animal below. 10% energy continues to next level.
13 CHANGES IN THE ECOSYSTEM CAUSE CHANGES IN THE PYRAMID - BUT THESE WILL EVENTUALLY BALANCE THEMSELVES OUT.