ENGL121 Lecture Notes - Lecture 18: Density Dependence, Directional Selection, Generation Time
3 Feb 2016
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Office hours for midterm: wed 12:30- 1:30 (regular hours) Has a lot to do with birth dynamics* Nt+1 = nt + b + i d e (number of individuals in a population at a time (nt) + birth + immigration death emigration. Makes it hard to compare between populations so to make comparisons per capita rates are used. Nt+1 = nt + nt (b + i d e ) b-per capita rate of birth, etc. Density independent: population density has no effect of the per capita rate of something. Example: birth and death rates don"t change depending on the number of individuals in the population. Density dependent: factors usually associated with biotic factors. Per capita rates change with the changes in number of individuals. Density of individuals would change between good years and bad years . Population was very high- the likelihood of a male of finding a territory was lower.
