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♻️  Unit 8: Aquatic and Terrestrial Pollution

3.3 Survivorship Curves

#population

#survivorshipcurves

⏱️  1 min read

written by

Karla Jauregui Sandoval

karla jauregui sandoval


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Survivorship curves are used to compare the pattern of mortality between species. The curves show the number of members of a population that reaches various age groups. There are three types of survivorship curves which detail a different pattern for each one. It's important to understand this concept in the larger picture of an environment's ecology.

Type 1 shows a curve in which most of the population dies off toward their old age. This curve shows the reproductive pattern of K-selected species because energy and time goes into parental care which is why their species dies off at old age. 

Type 2 curve shows a constant loss population that is not affected by age. Age doesn't determine survivalism or mortality. This curve shows that the survivability reality is constant regardless of age 

Type 3 curve shows a species that has an early loss population and few live to old age. This pattern can be seen in r-selected species because the huge number of offspring and no or few parental care results in the majority of offspring to die young.

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Survivability

Type 1 

Type 2 

Type 3 

Early Age 

High 

High 

High 

Middle Age 

High 

Medium

Low

Old Age 

Low

Low

Low

Example

Humans

Song Birds, Bees 

Frogs

K/r 

K

K

r

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