Trophic pyramid

A trophic pyramid is a graphical representation of the biomass, energy, or numerical abundance of organisms at each trophic level in an ecosystem. The classic pyramid shows producers at the base, herbivores above them, and carnivores at the apex — with each successive level containing roughly one-tenth the biomass of the level below, a pattern known as the ten percent law. The pyramid is a powerful visual tool but a dangerous oversimplification. In aquatic ecosystems, inverted pyramids are common, where primary consumers outweigh producers because phytoplankton reproduce and are consumed rapidly. In systems with high omnivory, the pyramid collapses into a web. The trophic pyramid persists in education because it is easier to draw than a food web, not because it is more accurate. Its pedagogical utility is real; its descriptive validity is limited.