GEV 1050 Lecture Notes - Lecture 8: Exponential Growth, Environmental Science, Primary Producers
28 Nov 2016
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Tracking organisms: tedious process (could use collars but inefficient) Density differs with each organism: territory, mating patterns, level of movement. Bacteria has highest level of density because smallest area that it occupies/the vast amount of them: hong kong v. greenland. 6690 people per sq k v. 0. 0026 (differs immensely) clumped elephant uniform bush (territorial, sea gulls) random-dandelions (clumped and random are most common) Amount of food, range, water, nutrients, light, oxygen. Birthrate, death rate most important factors to determine size: reindeer: boom and bust (initially lots of resources, use up, reproduce, overpopulate, ecosystem crash) (birth rate, death rate, dispersal, migration =4 factors to population change) Intrinsic growth rate r=b-d (global scale ) local scale r=b-d +(i-e) [immigration and emigration] Intrinsic growth rate: maximum potential for organism to grow (cockroaches produce more offspring thn can survive, have high intrinisc growth rate: exponential under ideal conditions. Each species has own based on life history characteristics. Age at first reproduction (humans =slow, 14-21)
