BIOL 2804 Lecture Notes - Lecture 9: Survivorship Curve, Life Table, Exponential Growth
24 Dec 2019
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Objectives: births and deaths ultimately determine population growth rates, understand terminology, basic box and arrow diagrams, exponential growth. Understanding birth and death rates in a life table: follow marked individuals over time and assess survival and reproduction (very hard, assess birth and death rates of individuals of known age at given time slice. Let x be age: nx = number of individuals alive. Birthrate is age specific: only females reproduce (few exceptions, bx = mean number of females born to a female in each age group, per capita fecundity rates for females, fecundity table = tabulation of bx for a population. Net reproductive rate = average number of female offspring that will be produced over a lifetime by a newborn female. R0 = sum of (ix times bx: = 1 stable population, > 1 population increasing, < 1 population decreasing, r0 is a key characteristic of populations, especially populations of pathogens.
