BIOA02H3 Lecture Notes - Intraspecific Competition, Secondary Succession, Interspecific Competition
9 Dec 2012
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The species that live an interact in an area. Ecological communities are not an aggregate unit of organisms that move together when environmental conditions change. Rather, each separate unit independently interacts with its biotic and abiotic environment. Consists of the organisms whose energy source has passed through the same number of steps to reach them. The organisms in a community can be divided into different trophic levels based on their source of energy: primary producers: Consists of plants and other photosynthetic organisms which gain their energy from the sun (consists the tropic level: photosynthesizers: primary consumers: Non-photosynthetic organism that consume the energy rich organic molecules of the primary producers (constitute the trophic level: herbivores: secondary consumers: organism that eat primary consumers, tertiary consumers: Organism that eat secondary consumers: decomposers, omnivores: Organisms that eat the dead bodies of organisms or their waste products a. k. a. detritivors. Organisms that receive their food source from more than one trophic.
