| A | B |
|---|
| population density | the number of organisms in a specific area |
| estimate | an approximate number, based on good observations |
| death rate | the number of deaths in a population in a certain amount of time |
| immigration | moving into a population |
| emigration | leaving a population |
| limiting factor | an environmental factor that prevents a population from increasing |
| carrying capacity | the largest population that an environment can support |
| population density formula | Density =#organisms/area |
| direct observation | actually counting all the organisms in the population |
| indirect observation | counting organisms using traces of them like footprints |
| sampling | count the organisms in a small area and multiply to estimate the number in a larger area |
| mark and recapture | capture organisms, mark and release them and recapture, then use a formula to estimate population |
| mark and recapture formula | # organisms marked x total #captured/nubmer recaptured with marks= population |
| birth rate | number of births in a population over a period of time |
| death rate | number of deaths in a population over a period of time |
| space | too little area to live will cause organisms to die or leave the area |
| food | populations cannot exceed the amount of this available to them for energy |
| weather | a limiting factor based on temperature and rainfall |
| 5 deer/acre | population density of 20 deer found on 4 acres of land |
| 2 deer/acre | population density of 30 acres with 60 deer living on it |
