Biology 3445F Lecture Notes - Lecture 7: Character Displacement, Covariance, Competitive Exclusion Principle
Document Summary
The concept of the niche *reading, nov. 19, 2012* Competitive exclusion principle, mechanisms of coexistence, resource partitioning. Interactions among species niche overlap, niche packing. Grinnell (1917) habitat or environment an organism is capable of occupying. Elton (1927) the role a species plays in the community. Gause (1934) niche overlap = competition. Niche definition hutchinson (1957) n-dimensional hypervolume defined by axes of resource use and/or environmental conditions, within which a population of a species can persist (i. e. r0 1) Types of niches they can be delineated along several lines. Resource use, temporal/spatial, habitat, life form, phenology, regeneration. Niche packing various perspectives (next page pic 1) Fill: number of species accommodated per unit resource space. Pattern: spacing of resource use distributions for non- overlapping species. Niche overlap use of same resources by two or more species (right pic 2) Early niche models = direct interactions between an organism and its environment.
