BIOLOGY 152 Lecture Notes - Lecture 32: Generation Time, Inflection, Logistic Function
Document Summary
Environment of an organism consists of anything that might affect its chance to survive and reproduce. We only model the important things: driving variables variables that push the behavior of the system. General: air temperature, soil moisture, humidity, presence/absence of predators, etc. Population dynamics: the patterns of and mechanisms of population change. Simple model of population growth: change in population size = births deaths. N = b d (ignoring immigration and emigration: this is a very limited model that can only track closed environments such as isolated islands. A more useful way of looking at the data is rates. Per capita birth rate: births / total population = rate births/person/year. Per capita death rate: deaths / total population = rate deaths/person/year. Per capita growth rate (r): r = b d (per capita birth rate per capita death rate) r > 0: growing population r < 0: shrinking population r = 0: population is stable ->
