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10 Cards in this Set
- Front
- Back
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the statistical study of group properties of populations--size, age and sex structure, and changes within them
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Demography.
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The proportion of individuals dying during a specified time interval.
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Mortality Rate.
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The average number of years into the future that an individual in the population is expected to live.
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Life Expectancy.
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The proportion of individuals that died during any given time interval divided by the proportion of alive at the beginning of that interval provides.
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Age Specific Mortality Rate.
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Two ways to graphically display data from the life table.
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Mortality and Survivorship Curves.
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If the survivor rate is high throughout the life span and followed by high mortality at the end, the surviviorship curve is convex or
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Type I (typical of humans and other animals)
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If survivor rates do not vary with age, the survivorship curve is straight or
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Type II (typical of birds, rodents, reptiles, and perennial plants)
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If the survivor rate is high early in life, the survivorship curve is concave or
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Type III (typical of oysters, fish, many invertebrates, and many plant species).
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Expressed as births per 1000 population per unit of time
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Birth rate (Natality rate)
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When deaths exceed births, emigration exceeds immigration, and habitat loss forces population decline to a point where the species ceaces to exist.
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Extinction.
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