Lecture 22

Lecture 22 - Bio 121 Lecture 22 interactions among...

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Bio 121 Lecture 22 – interactions among populations A. The possibilities Ecological interactions Interactions Organism A Organism B competition - - predation + - Parasitism* + - Mutualism* + + Comencialism* + o *symbiosis – close and often long term association of different species B. The ecological niche – the range of biotic and abiotic environmental conditions in which an organism can survive and reproduce (role of the species) (set of tolerance curves). a. Fundamental niche – all of the resources that an organism and theorectically use(where you could be) b. Realized niche – subset of fundamental niche which is actually utilized by the organism, limited due to other biotic interactions (where you actually are) c. Competitive exclusion principle c.i. 1934, guass did competition studies with Protista c.i.1. Two similar species which compete for similar resources can’t exist in same place c.i.2. Biologist reformed to: there is a limit to the amount of niche overlap that allow species to coexist C. Competition – two or more species use the same resources that are limited in an environment. (mutually negative effect)
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Lecture 22 - Bio 121 Lecture 22 interactions among...

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