ENV100Y5 Lecture Notes - Lecture 18: Logistic Function, Carrying Capacity, Interspecific Competition
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ENV100Y5 Full Course Notes
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Session 18: species interactions and community ecology (i) (21-10-15) Populations may grow, shrink, or remain stable: natality = births, mortality = deaths. Immigration = arrival from outside: emigration = departure to outside. Unregulated populations: steady growth rates cause exponential population growth, cannot be sustained indefinitely, small population and ideal conditions. Topics: species interactions, feeding relationships, energy flow, trophic levels and food webs, biomes. In 1988 european ships discharged water into lake st. clair, canada: within 2 years, in all 5 great lakes, no natural predators, competitors, or parasites, hundreds of millions of dollars of damage to property. Competition: competition = multiple organisms seek the same limited resources, competitive exclusion or species coexistence. Resource partitioning: species divide shared resources by specializing in different ways, warblers ex from last lecture (in last slide too, they do this to avoid competition because competition would be too much effort and waste energy.
