BIOL 121 Lecture Notes - Lecture 24: Intraspecific Competition, Interspecific Competition
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Document Summary
A biological community consists of interacting species, usually living within a defined area. A community lies between the spatial scales of a population and a biome. A relationship between 2 species that provides a fitness benefit to members of one species. A relationship that hurts members of the other species is a interaction. A relationship that has no effect on the members of either species is a 0 interaction: competition is a -/- interaction that occurs when individuals use the same limited resources. Intraspecific competition occurs between members of the same species. Because intraspecific competition for resources intensifies as a population"s density increases, it is a major cause of density-dependent growth. Interspecific competition occurs between members of different species. Interspecific competition occurs when the niches of two species overlap. Fundamental niches: the resources used or conditions tolerated in the absence of competitors (no significant competitors b/c you can"t completely be isolated)
