| Term | Definition |
|---|
| direct observation | method of counting one-by-one; e.g. there are twelve raccoons in our backyard |
| indirect observation | method of observing tracks or other signs; e.g. 100 nests x 5 swallows per nest = 500 swallows |
| sampling | method of estimating; count # of organisms in one small area and multiply it by many more areas; e.g. 8 oaks in 10 square miles = 800 oaks in 1000 square miles |
| mark-and-recapture studies | # of marked x # captured/# recaptured with marks = population density |
| birth rate | # of births in a population in a certain amount of time (usually one year); increases population size |
| death rate | # of deaths in a population in a certain amount of time (usually one year); decreases population size |
| population equation | if birth rate > death rate, population size increases; if death rate > birth rate, population size decreases |
| immigration | moving into a population (think coming in) |
| emigration | moving out of a population (think exiting the population) |
| limiting factor | an environmental factor that prevents a population from increasing e.g. food, space, and weather conditions |
Combine with other sets
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