BIOL 180 Chapter Notes - Chapter 3: Parasitism, Metapopulation, Exponential Growth

• School: UW
• Department: Biology
• Course: BIOL 180
• Professor: John W Parks

Document Summary

Four processes affect a population size: births and immigration add to a population, deaths and emigration remove them. Change in a population size (delta n) per unit time (delta t) If population is isolated (no immigration or emigration) Exponential growth equation: number of individuals (n) in the population times the difference between the birth. Rate per individual (b) and death rate per individual (d) Per capita rate of increase (r): difference between the birth rate and death rate per individual (b-d) If b>d, r>0 --> population is growing. If b population is declining. Delta n / delta t = a change in population size over a discrete time interval (ex. Instantaneous change in population size over a time intervale: ^^^ exponential population growth r = instantaneous rate of increase. Does not change over time o o dn/dt increases as population size n increases. Intrinsic rate of increase (rmax): when conditions are optimal for a particular species o.