✓Explain why there is a reduction in available energy at each trophic level in a food chain.
✓Explain how energy is used at each trophic level by organisms.
✓Explain what is shown by pyramids of numbers and pyramids of biomass.
✓Relate energy loss to the limited length of food chains and to Caribbean ecosystems.
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Imagine a coral reef off the coast of Barbados. Tiny phytoplankton use sunlight to make food. Small fish eat the plankton, larger fish eat the small fish, and sharks are at the top of this food chain. There are thousands of plankton, hundreds of small fish, fewer big fish, and only a few sharks. Why are there so many at the bottom and so few at the top? The answer lies in how energy flows through the ecosystem.
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How confident are you about energy through an ecosystem right now?
💡Engage
Imagine a coral reef off the coast of Barbados. Tiny phytoplankton use sunlight to make food. Small fish eat the plankton, larger fish eat the small fish, and sharks are at the top of this food chain. There are thousands of plankton, hundreds of small fish, fewer big fish, and only a few sharks. Why are there so many at the bottom and so few at the top? The answer lies in how energy flows through the ecosystem.