BIS 2B Lecture Notes - Lecture 5: Exponential Growth, Carrying Capacity, Logistic Function

• School: UC-Davis
• Department: Biological Sciences
• Course: BIS 2B
• Professor: Mark Schwartz; Sharon Strauss

Document Summary

Factors influencing whether a population grows or shrinks. Exponential growth and how we write that mathematically. Factors that influence population growth: b= # of birth, d= # of deaths. I= # of immigrants: e= # of emigrants. Open population: changes in population due to immigrants and immigrants in addition to birth and deaths. Closed population: numbers change only due to births and death. Model of population growth in a open population. Population in the future = population now + (# of births - # of deaths) + (# of immigrants - 2 types of population growth affected by population size. Exponential: per-capita (per-individual) growth rate is constant or density independent. The net number of individual gained or lost per capita is not. Model of population in a closed population b. T time as a function of the birth rates and death rates and initial population. It"s the rates not actual number of birth and death.