Question

Please explain and describe the three types of survivorship curves observed in natural populations and give some examples of organisms that might exhibit each one. Be sure to discuss the strategy involved wit each one.

Answer 1

Survivorhsip curve is a graph that measures the proportion of individula in a given species that are alive at different ages. Number of individual are on y axis and ages is plotted on x axis. there are three types called type I, II and III

type I shows individual that have a high probability of serviving though early and middle life age but have rapid decline in the number of individual surviving into late life. That measn this group make it to adult hood but surviing in olg age is less. It shows convex curve on graph. including humans and many other large mammals.

Type II Shows a roughly constant mortality rate for the species through its entire life. means they are dying at different age and they shows diagonal line on graph going down to x axis. Some birds and some lizards follow this pattern.

type III Depicts species where few individuals wil live to adulthood and die as they get older because the greatest mortality for theses individual experienced early in life.They haev concave curve on graph. This includes most marine invertebrates.