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Unit 3

3.3 Survivorship Curves

1 min readapril 29, 2020

Karla Jauregui Sandoval


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Image Courtesy of Pixabay

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.
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2FCapture.JPG?alt=media&token=14ef3095-0cf0-4c75-abc5-1f37fe233848
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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