BIOL 203 Lecture Notes - Lecture 13: Life Table, Exponential Growth
Document Summary
Population growth: populations grow by multiplication, exponential growth - change in size of population with continuous reproduction by a constant proportion (of population size n) at each instant of time. Dn/dt = rn: n = population size, r = instantaneous per capita rate of increase (intrinsic rate of increase, units individuals/individual/unit time, dt = instantaneous individual rate of change in population size. Exponential growth: dn/dt = slope of the line, exponential growth. What if population doesn"t reproduce continuously: populations with discrete breeding periods experience geometric growth, graph: Has pulses of death and birth, but overall rising slope. Life tables: life table: age-speci c schedule of survivorship and reproduction, cohort life table: follows fate of a group of individuals born at the same time from birth to death, static life table. Survivorship curves: type 1 - most mortality occurs towards the end of life. Ex. mountain ram, humans, mammals (generally) because of extended parental care.
