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KEY CONCEPT Every organism has a habitat and a niche.

KEY CONCEPT Every organism has a habitat and a niche. A habitat differs from a niche. A habitat is all aspects of the area in which an organism lives. biotic factors abiotic factors.

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KEY CONCEPT Every organism has a habitat and a niche.

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  1. KEY CONCEPT Every organism has a habitat and a niche.

  2. A habitat differs from a niche. • A habitat is all aspects of the area in which an organism lives. • biotic factors • abiotic factors • An ecological niche includes all of the factors that a species needs to survive, stay healthy, and reproduce. • food • abiotic conditions • behavior Fig. A lion must hunt and kill its prey in order to survive on the African savannah. Its role as a top predator is part of the lion's niche.

  3. Resource availability gives structure to a community. • Species can share habitats and resources. • Competition occurs when two species use resources in the same way. • Competitive exclusion keeps two species from occupying the same niche.

  4. One species is better suited to the niche and the other will either be pushed out or become extinct. • The niche will be divided. • The two species will further diverge. • Competitive exclusion has different outcomes. Fig. Even though bees and butterflies both use these flowers for food, they occupy different niches. Many species with similar niches can coexist.

  5. Madagascar South America • Ecological equivalents are species that occupy similar niches but live in different geographical regions.

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