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18 Cards in this Set
- Front
- Back
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birth rate
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the number of births in a population in a certain amount of time
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carrying capacity
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the largest population that an area can support
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death rate
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the number of deaths in a populaton in a certain amount of time
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emigration
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leaving a population
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estimate
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an approximation of a number based on reasonable assumptions
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immigration
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moving into a population
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limiting factor
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an environmental factor that causes a population to decrease
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population density
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the number of individuals in an area of a specific size
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population
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all the members of one species in a particular area
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reproduction potential
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the theoretical unlimited growth of a population over time
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abiotic limiting factors
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weather, pollution, space, water, climate
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biotic limiting factors
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disease, food, predator/prey, competition, injury, old age
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survival rate
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the percentage of a population that survives to reproduce
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male/female ratio
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the number of males verses the number of females in a population
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direct observation
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counting all of individuals in a population
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indirect observation
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observe signs of organisms instead of actually counting them
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sampling
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count all the individuals in a small area and then estimate how many are in the entire area
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mark and recapture
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organisms of a population are caught and marked some how, banding etc. and then released, later organisms are captured again and a count is made of how many were caught that were marked the first time
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