COMMUNITY ECOLOGY I pp. 399-403.

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Presentation transcript:

COMMUNITY ECOLOGY I pp. 399-403

Species (organism) Population Community (interaction of different populations) Ecosystem Biosphere

SYMBIOSIS Close interactions between two (populations) of organisms

Mutualism

Competition Niches overlap and resources are limited a) Interspecific competition: two different species use same food source b) Intraspecific competition: competition within the same species (population) - very intense because they have identical requirements

Niches overlap and resources are limited Fundamental niche: set of resources a population is capable of using under ideal conditions Realized niche: resources a population actually uses due to interspecific interactions

c) Competitive exclusion: one species presence causes other species to die, move, or switch to a new food source

d) Character displacement: divergence of characteristics (i. e d) Character displacement: divergence of characteristics (i.e. beaks in finches) e) Resource (niche) partitioning: using specific parts of the same resource (i.e. trees)