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10 Cards in this Set

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