What are the 3 types of survivorship curve?
What are the 3 types of survivorship curve?
There are three types of survivorship curves. Type I curves depict individuals that have a high probability of surviving to adulthood. Type II curves depict individuals whose chance of survival is independent of age. Type III curves depict individuals that mostly die in the early stages of their life.
What are mortality curves?
A graph that depicts the change in mortality rates throughout life.
What is a Type III mortality curve?
In survivorship curve. The Type III curve, characteristic of small mammals, fishes, and invertebrates, is the opposite: it describes organisms with a high death rate (or low survivorship rate) immediately following birth.
What animals have a Type 1 survivorship curve?
Humans and most mammals have a Type I survivorship curve, because death primarily occurs in the older years. The Type I survivorship curve is represented by a convex curve, which rapidly declines at the end. Birds have a Type II survivorship curve, as death at any age is equally probable.
What is a Type 1 curve?
Type I or convex curves are characterized by high age-specific survival probability in early and middle life, followed by a rapid decline in survival in later life. They are typical of species that produce few offspring but care for them well, including humans and many other large mammals.
What causes a Type 3 survivorship curve?
Type III or concave curves have the greatest mortality (lowest age-specific survival) early in life, with relatively low rates of death (high probability of survival) for those surviving this bottleneck. This type of curve is characteristic of species that produce a large number of offspring (see r/K selection theory).
What is a characteristic of Type 1 survivorship curves?
What does Type 1 survivorship curve mean?
In survivorship curve. The Type I curve, illustrated by the large mammals, tracks organisms that tend to live long lives (low death rate and high survivorship rate); toward the end of their life expectancies, however, there is a dramatic increase in the death rate.