BIO 105 Lecture Notes - Lecture 24: Competitive Exclusion Principle, Four-Dimensional Space, Ecological Niche
Document Summary
3 types of interactions: positive , negative , neutral . Species 1 and 2 designated by whichever is seen first. Types for predation, parasitism, commensalism can all be switched, were arbitrarily assigned for the sake of example. Competition (neg. /neg. relationship): two (or more) organisms require the same resource that is in short supply (e. g. space) Niche: lots of charts, see notebook! n-dimensional hypervolume that describes the conditions for species persistence. N-dimensional hypervolume > 3 dimensions because volume = 3-d. 2-d area that describes optimal conditions for persistence. 2 types of niche: fundamental niche: physiological niche. Absence of enemies (no predators, competitors, parasites) Its where a species could be found (can exist under the conditions: realized niche: ecological niche. Enemies are present (or they could be present) Realized niche= always smaller than the fundamental niche: fundamental niche= physiological niche; where could be found larger area than realized niche, realized niche= ecological niche; where actually found.
