biology list three vocab
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Created by:
aefinatic77 on February 18, 2010
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26 terms
Terms | Definitions |
|---|---|
 carrying capacity | the number or organisms of one species that an environment can support indefinitely. |
| density-dependent factor | have an increasing effect as the population increases. |
| density-independent factor | affect populations, regardless of their density |
| exponential growth | as a population gets larger, it also grows at a faster rate |
| life-history pattern | organism's reproductive pattern |
| age structure | the proportions of the population that are in different age levels |
| birthrate | the number of live births per 1000 population in a given year |
| death rate | the number of deaths per 1000 population in a given year |
| demography | the study of human population size, density and distribution, movement, and its birthrates and death rates |
| doubling time | the time needed for a population to double in size |
| acid precipitation | rain, snow, sleet, and fog with low ph levels |
| biodiversity | the variety of species in a specific area |
| edge effects | the different conditions along the boundaries of an ecosystem |
| endangered species | when its numbers become so low that extinction is possible |
| exotic species | not native to a particular area |
| extinction | disappearance of a species when the last of its members die |
| habitat degradation | damage to habitat by pollution |
| habitat fragmentation | the separation of wilderness areas from other wilderness areas |
| ozone layer | helps to protect living organism's on Earth's surface from damaging doses of uv radiation from the sun |
| threatened species | when the population of a species is likely to become endangered |
| captivity | an organism that is help by people |
| conservation biology | the study and implementation of methods to protect biodiversity |
| habitat corridors | protected strips of land that allow the migration of organisms from one wilderness area to another |
| natural resources | parts of the environment that are useful or necessary for living organisms |
| reintroduction programs | release organisms into an area where the species once lived |
| sustainable use | strives to enable people to use natural resources in ways that will benefit them and maintain the ecosystem |
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