competition for resources

in ecology, the use of the same resource by individuals of the same species (intraspecific competition) or of different species (interspecific competition) when the supply of the resource is insufficient for the combined needs of all individuals. It is a major factor in natural selection. Also called struggle for existence. See also Darwinism; survival of the fittest.

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Psychology term of the day

December 20th 2024

dysthymic disorder

in DSM–IV–TR, a mood disorder characterized by symptoms that are less severe but more enduring than those in major depressive disorder. It is identified as persistent depressive disorder in DSM–5. Also called dysthymia.