BIO 309 Lecture Notes - Lecture 17: Competitive Exclusion Principle, Intraspecific Competition, Interspecific Competition
28 Oct 2018
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Document Summary
When two organisms interact, there are three possible impacts on each: positive, negative, or neutral. Impacts can be severe or much more subtle (getting eaten versus having to travel farther to look for food) Interactions that result in no consequence are rarely studied. Some associations are very intimate, but does not dictate the impact on the organism involved, just because they are very close and significant does not mean death. Mycorrhizal fungi have intimate relationships with their hosts, but is not a life or death for either party. Commensalism is when one is benefited by the other is unaffected. Allelopathy is when plants change soil composition or toxicity to minimize competition. Interference competition: direct interactions between individuals-fighting, aggression, toxins, overgrowth, etc. Intraspecific competition: between same species for food, mates, territories, leadership. Interspecific competition: between two different species that reduces fitness of both, fight for territory, carrion, nesting sites, etc.
