pcb 3044 chapter 11 - Chapter 11: Competition Interspecific...

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Chapter 11: Competition Interspecific competition: an interaction between two species in which each is harmed when they both use the same limiting resource. Intraspecific competition: can occur between individuals of a single species (within). Competition for Resources Examples of resources that can be consumed to depletion: o Food o Water in terrestrial habitats. o Light for plants. o Space, essentially for sessile organisms. o For mobile animals, space for refuge, nesting. Physical factors affect population growth rates but are not consumed or depleted. o Examples: salinity, pH o Oxygen for marine vs. terrestrial organisms? How important is competition in ecological communities? Schoener (1983) found that of 390 species studied, 76% showed effects of competition under some circumstances, and 57% showed effects of competition under all circumstances tested. Connell (1983) found that competition was important for 50% of 215 species in 72 studied. Gurevitch et al. (1992) analyzed the magnitude of competitive effects
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This note was uploaded on 11/13/2009 for the course PCB PCB 3044 taught by Professor Woo during the Fall '09 term at University of Central Florida.

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pcb 3044 chapter 11 - Chapter 11: Competition Interspecific...

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