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bio def 02-20-09
bio def
| Question | Answer |
|---|---|
| carrying capacity | the number of organisms of one species that an environment can support indefinitely |
| density-dependent factor | factors taht have an increasing effect as the population increases. ex. disease, competition, predators, parasites, food shortage |
| density-independent factor | abiotic factors such as volcanic eruptions, temperature, storms, floods, drought, chemical pesticides, and major habitat disruption |
| exponential growth | as population gets larger, it also grows at a faster rate |
| life-history pattern | an organisms 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 |
| deathrate | the number of deaths per 1000 population in a given year |
| demography | the study of human population size, density and distribution movement, and its birth 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 values |
| biodiversity | variety of species in a specific area |
| edge effect | the different conditions along the boundaries of an ecosystem |
| endangered species | a species whose numbers become so low that extinction is possible |
| extinction | the disappearance of a species when the last of its member dies |
| habitat degradation | the damage to a habitat by pollution |
| habitat fragmentation | the separation of wilderness areas from other wilderness areas |
| ozone layer | a layer of oxygen that absorbs some of the ultraviolet radiation reaching Earth's surface |
| threatened species | a species whose numbers are low enough to become endangered |
| captivity | an organism that is held by people |
| conservation biology | the study of 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 | those parts of the environment that are useful or necessary for living organisms |
| reintroduction programs | a program that releases organisms into an area where the species once lived |
| sustainable use | a philosophy that strives to enable people to use natural resources in ways that will benefit them and maintain the ecosystem |
Created by:
cheesemonster7
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