BIS 2B Lecture 6: BIS 2B Notes - Lecture 6

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

Document Summary

Population - a group of individuals of the same species that can interbreed. Population density - number of individuals per unit area. Usually refer number of individuals in population as (n) When graphing: n as a function of t (time) factors that influence dynamics. B = births (the only factor in closed population) D = deaths (the only factor in closed population) E = emigrants (included in open population) Nt+1 = nt + b - d + i - e t = time. Exponential/geometric: per individual / per capita growth rate is constant or density independent. Density independent - birth/death rate not influenced by number of individuals in a population. Density population growth in closed population: nt+1 = nt + b - d. B = bnt ; d = dnt. Nt+1 = nt + bnt - dnt nt+1 - nt = (b-d)nt dn/dt = (b-d)n change in pop.