Type 2 survivorship curve?

Populations with Type II survivorship have a constant proportion of individuals dying over time. ... For example, the type II curve has a constant proportion of individuals dying each time period. Starting with 1,000 individuals, in the first time period if 40% survive, then only 400 will be left.

1. What organisms have a Type 2 survivorship curve?
2. What is a type 2 curve?
3. Do humans have a Type 2 survivorship curve?
4. Are reptiles Type 2 survivorship curve?
5. What is a Type 2 species?
6. Why do birds have a type 2 curve?
7. What is a Type I survivorship curve?
8. What does Type 3 survivorship curve mean?
9. What does Type 1 survivorship curve mean?
10. What type of survivorship is rabbit?
11. Are turtles Type 3 survivorship curve?
12. What type of survivorship curve do elephants have?
13. What are r selected species?
14. What is a Type 3 organism?
15. Why do humans exhibit this type of survivorship curve?
16. What statements are true about Type I survivorship?

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 is a type 2 curve?

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.

Do humans have a Type 2 survivorship curve?

A classic example of a type I survivorship curve is the human population. ... Type II survivorship curves indicate that the chance if dying is independent of age. Type II survivorship curves are used for animals, such as birds, who have many random chances of being killed or dying at all stages of their life.

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.

What is a Type 2 species?

Type II. Many bird species have a Type II survivorship curve. In a Type II curve, organisms die more or less equally at each age interval. Organisms with this type of survivorship curve may also have relatively few offspring and provide significant parental care.

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.

What is a Type I survivorship curve?

life tables

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.

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.

What does Type 1 survivorship curve mean?

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 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).

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 type of survivorship curve do elephants have?

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

What are r selected species?

r-selected species, also called r-strategist, species whose populations are governed by their biotic potential (maximum reproductive capacity, r). ... The production of numerous small offspring followed by exponential population growth is the defining characteristic of r-selected species.

What is a Type 3 organism?

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.

Why do humans exhibit this type of survivorship curve?

Survivorship curves show the distribution of individuals in a population according to age. Humans and most mammals have a Type I survivorship curve, because death primarily occurs in the older years. Birds have a Type II survivorship curve, as death at any age is equally probable.

What statements are true about Type I survivorship?

What statements are true about Type I survivorship? ... There was greater difference in survivorship between the sexes in 2010. Only $35.99/year. When a particular marine invertebrate species spawns, it releases thousands of eggs.