Question

Ecologists use survivorship curves to visualize how to the number of individuals in population drops off with time. By plotting the number of survivors per 1,000 individuals on a log scale versus time, three basic patterns emerge, seen here in the graph. All BUT ONE statement describes Type I survivorship. That is

A. In general, this is more typical of K-selected species.

B. Heavy parental investment improves competitive ability and makes it more likely that individuals will survive to reproduction.

C. In general, this is more typical of r-selected species that experience a frequent disturbance or uncertainty in the environment.

D. Much effort is invested in each individual, resulting in high survivorship throughout the life cycle. Most individuals die of old age.

Answer 1

Type I survivorship curve represents k-strategists with significant parenting investement. C) this is more typical of r-selected species that experience a frequent disturbance or uncertainty in the environment.

What is the type I survivorship curve?

Type I survivorship curve is one of the three types of survivorship curves.

Mortality often occurs at the end of the cycle, representing species with low mortality.

Organisms exhibiting this type of survivorship curve have long cycles of life and high probability to survive until they are old enough. For instance, human beings are represented by this curve.

These species have few descendants and spend too much time and energy in parental care to ensure their reproductive success.

K strategists take care of their offspring and invest too much energy in doing it.

According to this information, the only statement that does not describe Type I survivorship curve is option C.

In general, this is more typical of r-selected species that experience a frequent disturbance or uncertainty in the environment.

You will learn more about survivorship curves at

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