Biology 2483A Lecture Notes - Lecture 10: Mountain Pine Beetle, Logistic Function, Exponential Growth
3 Jan 2018
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Document Summary
Population growth patterns include exponential growth, logistic growth, fluctuations and regular cycles. Delayed density dependence can cause populations to fluctuate in size. The risk of extinction increases greatly in small populations. In metapopulations, sets of spatially isolated populations are linked by dispersal. N is small causes what looks like exponential growth. N= k causes the decrease in the rate, reverse exponential. Together make the s curve: population growth patterns include exponential growth, logistic growth, fluctuations and regular cycles, population size changes in response to four biological processes: Nt+1 = nt + b d + i e. Population dynamics: the ways in which populations change in abundance over time. Biological factors (b, d, e,i are important, but density independent factors are also important) Week 7 population crash, some density independent event. 2008 (cid:449)e see it isn"t the ti(cid:373)e of year. Deviations from the theoretical logistical growth due to density dependent and independent factors: four patterns of population growth, exponential growth.
