Biology 1001A Lecture Notes - Interspecific Competition, Ecological Niche, Coevolution
23 Mar 2014
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46. 1 interspecific interactions: coevolution involves genetically based, reciprocal adaptations in two or more interacting species. Coevolution is not restricted to two species but often involves complex interactions among several species in a community. Community ecology: populations that interact in a given place. Why are populations distributed the way they are: some species limited by a single critical factor, many species have multidimensional tolerance limits (day, length, temperature, etc ) Ecological niche (2 definitions: role based- what an organism does, resource based- what an organism needs (and thus where it lives) Fundamental niche: where a species could potentially live (n-dimensional zone of tolerance, pre-interactive niche, don"t occupy fully competition, too many parasites, predators. Realized niche: where a species actually lives, post interactive niche, often smaller than the fundamental niche. Intraspecific competition- the dependence of two or more individuals in a population on the same limiting resource (can occur between two different species)
