BSC 2011 Lecture Notes - Lecture 31: Centaurea Solstitialis, Exponential Growth, Hectare
8 Apr 2015
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Bsc2011 - integrated principles of biology 2 - lecture 31: population part 3. How many total years would it take for the star-thistle to completely cover jane"s. Year 1: 1 hectare, year 2: 2x1=2, year 3: 2x2=4, year 4: 2x4=8, year 5: 2x8=16, year 6: 2x16=32, year 7: 2x32=64, year 8: 2x64=128 hectares. Under ideal conditions, populations can grow rapidly. Geometric (additive) growth model: compares population sizes at regular time intervals. Multiplicative (exponential) growth model: population increases continuously at an exponential rate. Growth rate is the number of new individuals produced in a given amount of time minus the number of individuals that die. Intrinsic growth rate (r): highest possible per capita growth rate for a population. Multiplicative (exponential) growth model (population growth under ideal conditions): N(t) = current size of the population. E = base of the natural log (e = 2. 72) T = amount of time over which population grows.
