Population+Growth+Curves_6th

 5.1 Population Growth Curves A. Exponential Growth  **(**[|**http://members.optusnet.com.au/exponentialist/Exponential%20Growth_files/Constant70.gif**]**)** 
 * 1) occurs when a population growth increases at same rate
 * 2) Over time, the population becomes larger and larger until it approaches an infintely large size
 * 3) Under the best conditions with unlimited resources, the population will grow exponential (supposedly).
 * example- Bacteria grows at a constant rate **

B. Logistic Growth  example- Rabbits are known to breed very quickly and very often. However, though they may continue the breed, predators such as hawks will consume the rabbits, causing the population growth to slow or stop.  C. Carrying Capacity <span style="font-size: 14px; font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);"><span style="background-color: rgb(255,255,255);">3. In the natural world, there are many factors that can slow the growth of a population (discussed in next section) <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);"> ([])
 * 1) <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">occurs when a population's growth slows or stops after a period of exponential growth ("stop being generally- the population still continues to go up and down though at a signifigantly smaller rate)
 * 2) <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">graph identifiable by the distictive S-curve
 * 3) <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">The ups (exponential growth) and downs (logisic growth) help a population from going over the carrying capacity
 * 4) <span style="font-size: 14px; color: rgb(0,0,0); font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">DOES NOT mean that the size of the population decreases
 * 5) <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);"><span style="font-size: 14px; color: rgb(0,0,0); background-color: rgb(255,255,255);">Possible reasons for Logistic Growth <span style="font-size: 14px; color: rgb(100,32,60); background-color: rgb(255,255,255);">
 * <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">birth rate decreases/ deathrate increases/both at the same rate
 * <span style="font-size: 14px; background-color: rgb(255,253,0);"><span style="background-color: rgb(255,255,255);"> rate of immigration descreases/ rate of emigration increases/ both at the same time
 * <span style="font-size: 14px; background-color: rgb(255,253,0);"><span style="background-color: rgb(255,255,255);"> less resources available.
 * 1) <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">largest number of individuals of a population that a given environment can support
 * 2) <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">often represented with a graph
 * <span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);">tells the size of the population when the average growth rate reaches zero on the y-axis
 * example- Northborough and Southborough can only carry a certain number or inhabitants. It would be impossible to try to fit the United States's population in Nboro/Sboro- it goes over the carrying capacity.

Short Movie About Exponential and Logistic Growth (with bunnies)<span style="font-family: Verdana,Geneva,sans-serif; background-color: rgb(255,255,255);"> [<-- MUST WATCH]media type="youtube" key="0HJpGF5yaDc" height="344" width="425"

credits: Nicole A.-Exponential/Logistic Growth; Ariel C.- Logistic Growth and Carrying Capacity; videos and pictures found by both