BIOS10117 Lecture Notes - Lecture 10: Exponential Growth, Carboniferous, Population Ecology
22 Jan 2016
School
Department
Course
Professor
Document Summary
Population ecology- how numbers of individuals within populations change over space. Total 3 births/deaths divided by total 3 individuals in a time unit. Change in population size a result of births, deaths, immigration, and emigration. Change in population size over time determined by births-deaths. Exponential growth occurs when population density doubles in a constant time. Logistic growth accounts for carrying capacity (k)- curve is s shaped o o. Population regulation- density dependent ecological forces that keep population. Density dependent abundances within upper and lower limits. It is the fate of all species to either go extinct or evolve into another species. Extinction rate that we are supposed to have = 1-100 per year. Extinction rates are actually much higher- 20,000-80,000 per year o. Not super specific bc so many things that hard to monitor because tropical rainforest has so many species. Background rate for mammal extinction= 1/200 years, but is 89/last 400 years o.
