GEOG 310 Lecture Notes - Lecture 2: Exponential Growth, Logistic Function, Doubling Time
Document Summary
Limits to growth and basic concepts for ecological understanding: Influence that we as humans have based on where we live: one way is measuring the intensity of the human footprint. Outline: population growth from an ecological perspective, human population growth, its limits and the impacts of growth on the planet. Quantity inc. by fixed amount over successive time periods(slow and steady: exponential/geometric growth. Quantity increase by fixed fraction over successive time periods(faster and faster) Building model of population growth(slide 8: nt: (no. of individuals this year) + births deaths = nt+1(no. of individuals next year, rate of increase(r)= rate of new births rate of new deaths. We can make a prediction based on this data. Growth: we can calculate the population size at any time(t, nt(future population size) = n0(current population size, no. of individuals when time = 0 or starting point) x e(constant for exponential function[~2. 718] On assumption that r(pop growth rate) = constant.
