Definition of Survivorship Curve

A survivorship curve can be defined as the graphical representation that shows the number of individuals that belong to a certain age for a specific species or group. These types of graphs are constructed for such a group of individuals who are of somewhat the same ages.

Types of Survivorship Curve:

Three types of survivorship curves are present. Type I also have known as convex curve includes such individuals who have high age survival possibility but there comes a rapid decline later in life e.g. humans. Type II also known as diagonal curves includes such individuals whose possibility of survival remains almost constant e.g. birds and lizards. Type III is also known as concave curve and this type includes such individuals which have a very high mortality rate in early life e.g. marine invertebrates. Several reasons like environment contribute to this particular behaviour shown by species and population.