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ECOLOGICAL NICHES • Every species interacts with other species and with its environment in a unique way. 2.5 Ecological niche • These interactions define the ecological niche of a species, or the role of a species within its ecosystem. • An ecological niche includes what a species feeds on, what eats it, and how it behaves. • Consumers can be subdivided depending on what types of organisms they eat. Food Chains • 2.5 Feeding relationships between species can be represented using food chains. food chains trophic level • In a food chain, some of the chemical energy from the producer is passed along from one species to the next. • Because all organisms continually use and release energy to their environment, energy is continuously lost from all levels of the food chain. • The trophic level describes the position of an organism along a food chain. Species can be divided into trophic levels depending on how they obtain their energy. Food Webs • Food chains are used as a tool to show simple feeding relationships. • A food web is a more accurate, but still incomplete, way to illustrate feeding relationships. • Complex food webs are usually more stable than simple food webs, because species do not depend on just one source of food. 2.5 food web