01:119:115 Lecture Notes - Lecture 25: Niche Differentiation, Commensalism, Character Displacement
8 Dec 2017
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Document Summary
Community : association of populations that live and interact in the same place at same time -- Resource : anything from the environment that meets needs of a particular species many species. Limiting resource : a resource in scarce supply. Ecological niche : sum of species" use of biotic and abiotic resources = organism"s ecological role: how an organism uses materials in its environment, all physical, chemical, and biological factors a species needs. If an organism"s habitat is its address , the niche is the organism"s profession. 2 types of ecological niches: fundamentals niche, realized niche. Niche potentially occupied by that species -- broad. Niche actually occupied by that species -- more narrow resources actually used: competition. Competitive exclusion -- identical ecological niches competing for the same limiting resources cannot coexist (so what happens when two species try to occupy the same niche?: one can be extirpated (go locally extinct) Raised separately each pop reached k.
