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Trophic level *Each stage of a food chain is called a trophic level. *The producers occupy the first trophic level of any ecosystem . Level 1. Plants and algae /producers Level 2. Herbivores / primary consumers Level 3. Carnivorous/secondary consumers Level 4.Carnivorous / tertiary consumers Level 5.Apex predators which have no predators are at the top of the food web. * As we go from the lower (first)to the upper trophic level, the amount of initial energy decreases. This is because the producers use some of the energy for their own life processes and pass only a portion of the trapped chemical energy to the primary consumers. As a result more energy is available at the lower (first ) trophic level than the upper. BIOLOGICAL PYRAMIDS Basically there are three types of ecological pyramids. These are pyramid of number, pyramid of biomass and pyramid of energy PYRAMIDS OF NUMBERS *As the ...
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