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When a zebra eats the grass, it does not obtain all of the energy the grass has When a lion eats a zebra, it does not get all of the energy from the zebra The energy flow from one trophic level to the other is know as a food chain A food chain is simple and direct It involves organisms at separate trophic levels Notice that the direction the arrow points the arrow points in the direction of the energy transfer The arrow indicates “is eaten by” The linkages in a food web illustrate the feeding pathways The food web is an illustration of the various feeding methods that links an ecosystem into a unified system of exchange. If “something happens” to one member of the food web, it will affect the entire ecosystem. Niche: the role the organism has in an ecosystem Niches exist in food webs; if more than one species occupies the same niche in a food web, they will eventually need to compete to resources.