BIOL-UA 12 Lecture 27: Lecture 27
31 May 2016
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Lecture 27: communities: community: group of species that coexist and interact within a de ned area. They can be of different shapes and sizes: interspeci c interaction: Interactions between species in the community will greatly affect population structure and dynamics: competition: Compete for resource that limits their growth and survival. Occurs when two species overlap for a particular resource and degree of overlap de nes outcome of interaction. Niche: sum of a species" use of the biotic and abiotic resources in the environment. Two species cannot permanently coexist in a community if they have identical niches. One species would exclude the other (competitive exclusion principle). Ecologically similar species can coexist if one or more signi cant differences arise in their niches through time (resource partitioning). Fundamental niche: the overall potential of the species. Realized niche: portion of the fundamental niche it truly occupies due to interactions with other species.
