E2: Life Tables
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What is a life table?
Age-specific mortality schedule of a population.
Who origionally developed life tables?
Human demographers working for insurance companies.
What are the two kinds of life tables?
• Cohort life tables • Static life tables
What makes a cohort life table?
It is based on following a cohort throughout life.
Provide an example of a cohort life table.
Song Sparrow on Mandarte Island - 78% die during first year interval
What are the three types of survivorship curves?
Type I, type II, type III
Describe a type I survivorship curve.
• low mortality for most of life • higher losses of older organisms
Provide an example of a type I survivorship curve.
Humans
Describe a type II survivorship curve.
Constant rate of mortality
Provide an example of a type II survivorship curve.
Small mammals
Describe a type III survivorship curve
• high mortality early in life • followed by lower or constant mortality rates
Provide an example of a type III survivorship curve.
Invertebrates
What makes a static life table?
Calculated from cross section of a population at a specific time, like a snapshot