Well the trophic model is like the pyramid (Food Chain).
But the difference is that trophic model's change every time you go to a different ecosystem.
(Ecosystem Definition - http://dictionary.reference.com/browse/ecosystem)
Pristine Ecosystems have a wine shaped trophic model and Near - Pristine Ecosystems have a upside down wine shaped trophic model. Human affected ecosystems have a triangle trophic model.
The bottom-up model postulates a unidirectional influence from lower to higher trophic levels.
Food Web
The first trophic leval
Scavengers are on every trophic level
trophic as in higher trophic levels feed on lower ones
Trophic level
Third trophic level. It eats insects.
they are tertiary consumers. the first trophic level.
Their trophic level is primary consumer.
Trophic level efficiency is typically measured by calculating the amount of energy transferred from one trophic level to the next. This is done by analyzing the ratio of energy present in the biomass of one trophic level compared to the trophic level below it. The efficiency of energy transfer between trophic levels is usually around 10%, meaning that only around 10% of energy is transferred from one trophic level to the next.
Due to poor trophic transfer efficiency, most energy is lost at higher trophic levels.
Producers make up the first trophic level. A trophic level is each step in a food chain or food web is called a trophic level.