5.1+How+Populations+Grow_6th

= 5.1 How Populations Grow =


 * Characteristics of Population **
 * 1) **Geographic Distribution**
 * 2) **Density**
 * 3) **Growth**

**Population Growth Rates ** ** Factors affecting population size: ** <[]> When a population reaches the maximum amount of individuals for its environment, the growth slows off into a gentle "S curve". The mortality catches up with the natiality, and the population size remains consistent. Only a few dips or rises occur in the population size. This is in the natural, untouched, environment. <[]> This is called a "Boom and Crash" growth curve. When a population is inconsistent and always going through rises and falls, the growth looks like this. ^ **Population Density** **-Number of individuals per unit area** - The following are all factors that can greatly affect an population > a. Amount of food - The amount of food for a species within their ecosystem can easily determine the growth of its population. An abundance of food for the species will show a significant increase in population growth. A scarce food shortage will keep a species population at a minimum. > b. Disease - Populations can drop due to disease spreading through the organisms and their food > c. Competition- When organisms of the same or different species attempt to use an ecological resource in the same place at the same time > d. Parasites - Parasites are organisms that live and feed off other oraganisms. They give nothing back to the host and end up harming it significantly > a. Abiotic factors - The nonliving parts of the atmosphere. Abiotic factors like weather, water, temperature, and sunlight determine the survival and growth of an organism
 * 1) **Natiality - Number of births**
 * 2) **Mortality - Number of deaths**
 * 3) **Immigration - The number of individuals that enter the population**
 * 4) ** Emmigration - The number of individuals that leave the population **
 * 5) Populations can either increase or decrease in a number of ways.
 * 6) The number of births in one ecosystem is greater than the number of death, causing the population to rise.
 * 7) The number of deaths is greater than the number of births, causing the population to drop.
 * 8) More individuals immigrate into the population than those that emmigrate, causing the population to rise.
 * 9) More individuals emmigrate out of the population than those that immigrate, causing the population to drop.
 * 1) **Differs with the environment**
 * 1) **Density Independant**