How Many Trophic Levels Are There?

The number of trophic levels found in most durable natural ecosystems is four as both the disequilibrium of trophic energy flow at the lowest trophic level normalized to the incoming flow there and the incoming flow itself normalized to the maximum carrying flow decrease. The flow disequilibrium at a given trophic level is defined as the magnitude of trophic energy flow to be varied both dynamically and locally in order to fulfil the condition of energy flow continuity in that level.