•Producers at bottom, tertiary consumers at top
•Maximum of 4 levels to the pyramid.
Why?
•Biomass (total combined dry mass) is 90-99% less at each higher level. Why?
•Two Reasons
–Most energy consumed is not converted to consumer tissue (i.e. growth), most burned
–Supply of plant material far exceeds demand (most is not eaten, enters detritus)
–