LS Chapter 6 Populations, Communities, and Ecosystems

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Niche

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How an organism makes its living and interacts with the biotic and abiotic factors in its habitat

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Competition

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The struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time

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Predation

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An interaction in which one organism kills another for food or nutrients

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Symbiosis

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Any relationship in which two species live closely together and that benefits at least one of the species

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Commensalism

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A type of symbiosis between two species in which one species benefits and the other species is neither helped nor harmed

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Mutualism

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A type of symbiosis in which both species benefit from living together

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Parasitism

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A type of symbiosis in which one organism lives with, on, or in a host and harms it

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Succession

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The series of predictable changes that occur in a community over time

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Pioneer Species

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The first species to populate an area during succession

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Biodiversity

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The number and variety of different species in an area