Why food chains rarely exceed five levels of life
In short: Understanding trophic levels reveals the hidden physics of biology. This video breaks down how energy flows through ecosystems and why most food chains are surprisingly short.
Ecosystems are organized into trophic levels based on how organisms obtain energy. Producers, such as plants, form the first level. They are followed by primary consumers (herbivores), secondary consumers (carnivores), and tertiary consumers. At the top of these chains sit apex predators.
The primary constraint on these chains is energy loss. Only about 10% of energy is transferred from one level to the next, with the rest lost as heat or through metabolic processes. This '10% rule' explains why food chains are limited in length; there is simply not enough energy remaining to support a high number of successive predator levels.
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Sources
- Summary by Intellect · source: GCSE Biology - Trophic Levels - Producers, Consumers, Herbivores & Carnivores (2026/27 exams)
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