BIO 2129 Chapter Notes -Axa, Net Reproduction Rate, Exponential Growth
Document Summary
In the presence of abundant resources, populations can grow at geometric or exponential rates. When growing at max rates, some grow exponentially or geometrically. A population growing at its maximum rate grows slowly at first and then faster and faster (accelerates); some geometrically and some exponentially. Growth with pulsed reproduction, successive generations differ in size by constant ratio. Continuous population growth in an unlimited environment can be modelled as exponential population growth. (equation pg 312). Expresses the rate of population growth: may be positive or negative, subject to factors (disease, competition, actual r (realized) is less than rmax (constant, n = population size, rmax= rate of increase. Subscript because maximum capita rate of increase achieved by a species under ideal environmental conditions where birth, death, and age are constant (intrinsic rate of increase) Increases the rate of population increase, expo gets larger because r is times by large n.
