CHEM-UA 109 Lecture Notes - Lecture 5: Competitive Exclusion Principle, Interspecific Competition, Exponential Growth
16 Aug 2016
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Population cycles, fluctuations in population size because of population factors a. i. Limiting factors exert negative feedback on population growth when population is large a. ii. When small, limiting factors exert little negative feedback to renew growth: life history strategies for maximum fitness, r-selected species: a. i. Rapid growth (by opportunistic species like grasses: k-selected species: b. i. Constant growth at carrying capacity (i. e. humans: human population growth what made exponential growth possible a. One species outcompetes the other (other is eventually eliminated: resource partitioning b. i. By pursuing slightly different resources, individuals minimize competition: realized niche c. i. Fundamental niche when competitors are absent c. ii. Realized niche when competitors are present: character displacement (niche shift) d. i. As a result of resource partitioning, some individuals have new features (character displacement) Predation: true predator, kills and eats other animals, parasite, living off/on another organism, weakens host, parasitoid a.
