What types of organisms exhibit a type 2 survivorship curve?

For populations with Type II survivorship, the mortality of an individual does not depend on its age. Commonly listed examples of this include rodents, adult birds, and certain turtle species.

1. What organisms have a Type 2 survivorship curve?
2. What does a type II survivorship curve display?
3. Are reptiles Type 2 survivorship curve?
4. Are turtles Type 2 survivorship curve?
5. Is Rabbit Type 1 or 2 survivorship?
6. Why do birds have a type 2 curve?
7. Is Type 2 survivorship curve K selected species?
8. What are the different types of survivorship curves with examples?
9. What animals are r selected?
10. What type of survivorship is rabbit?
11. What type of survivorship curve Do turtles have?
12. Are turtles Type 3 survivorship curve?
13. What is a type one survivorship curve?
14. What type of survivorship curve do elephants have?
15. What does Type 3 survivorship curve mean?

What organisms have a Type 2 survivorship curve?

life tables

In contrast, the Type II curve considers birds, mice, and other organisms characterized by a relatively constant mortality or survivorship rate throughout their life expectancies. ... Certain lizards, perching birds, and rodents exhibit this type of survivorship curve.

What does a type II survivorship curve display?

A type II survivorship curve shows a roughly constant mortality rate for the species through its entire life. This means that the individual's chance of dying is independent of their age. Type II survivorship curves are plotted as a diagonal line going downward on a graph.

Are reptiles Type 2 survivorship curve?

Many birds, small mammals such as squirrels, and small reptiles, like lizards, have a Type II survivorship curve. The straight line indicates that the proportion alive in each age interval drops at a steady, regular pace. The likelihood of dying in any age interval is the same.

Are turtles Type 2 survivorship curve?

Worldwide, reptile populations are in decline due to habitat destruction and human disturbances. ... Healthy populations of turtles normally show this type of survivorship curve, where there is nearly equal probability of death for all ages (Frazer 1991). A Type II survivorship curve is linear, with a negative slope.

Is Rabbit Type 1 or 2 survivorship?

In between, there are some organisms like birds, mice, rabbits, butterflies, etc. that neither fit the k-, or r-strategist type of survival. They lie in a zone where their chances of survival remain the same throughout their lifespan. Such organisms follow the Type II or B curve of survivorship.

Why do birds have a type 2 curve?

Birds are an example of an intermediate or Type II survivorship curve because birds die more or less equally at each age interval. These organisms also may have relatively few offspring and provide significant parental care.

Is Type 2 survivorship curve K selected species?

(K-selected species), usually have a Type I survivorship curve. ... A constant probability of dying at any age, shown by the Type II survivorship curve, is evident as a straight line with a constant slope that…

What are the different types of survivorship curves with examples?

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 animals are r selected?

Typical examples of r-species are mice, rabbits, weeds and bacteria, which have a lot of offspring, but a short life expectancy. Examples of organisms undergoing K-selection are tortoises, elephants, people, and sequoia trees: their offspring are few but long-lived.

What type of survivorship is rabbit?

A slightly concave or sigmoid survivorship curve is characteristic of many birds, mice and rabbits. In these animals, the mortality rate is high during the younger stage but becomes lower and almost constant in the adult stage (1 year or older).

What type of survivorship curve Do turtles have?

However, the current litera- ture on turtle survivorship (see Appendix) suggests that turtles are better characterized by a type I11 survivorship curve (Table 1, Fig. l), with mortality rates inversely related to age.

Are turtles Type 3 survivorship curve?

Survivorship varies significantly across age-classes, with mortality generally inversely related to age (type III survivorship). Survivorship also varies significantly across habitat types, with marine and terrestrial turtles exhibiting higher survivorship early in life than freshwater turtles.

What is a type one survivorship 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 type of survivorship curve do elephants have?

Elephants have a Type I survivorship curve (mortality increases with age), and fecundity decreases with age.

What does Type 3 survivorship curve mean?

life tables

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.