BISC 102 Lecture Notes - Lecture 17: Secondary Succession, Chthamalus, Commensalism
21 Apr 2016
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Community: an assemblage of different species inhabiting a common environment that interacting with one another (plant, bird, mammal, reptile, insect etc. communities, or. Species interactions: effect they have on each other. (negative effect) Competition: interaction between organisms using the same limiting resource. Can be intraspecific (within species) or interspecific (between species). Nutrient competition, territorial (space) competition, overgrowth (light) competition. A unique set of interactions with its biotic and abiotic environment. The ecological role ( profession ) played by a species in a community. (habitat is the. Patterns and timing of activities (e. g. nesting sites, feeding times, food preferences) Example: the niches of chthamalus and balanus barnacles overlap. Chthamalus" realized niche is smaller than its fundamental niche. Realized niche: actual niche in presence of competitors. Competitive exclusion principle: two species cannot occupy the same niche; one will outcompete the other. Complete overlap of niches; asymmetric competition (one weaker, one stronger)
