What is a Type 1 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.

Which survivorship strategy is used by the Type II species?

The survival ship strategy used by type II species is this that they lie somewhere between semelparous ( comprised by single reproductive episode before death) and iteroparous (comprised by multiple reproductive cycles throughout the lifetime).

Do elephants have a Type 1 survivorship curve?

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

What is a Type 2 species?

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 the difference between a Type 1 and Type 3 survivorship curve?

A type I survivorship curve is plotted as a convex curve on a graph. A type III survivorship curve depicts species where few individuals will live to adulthood and die as they get older because the greatest mortality for these individuals is experienced early in life.

Are K selected species type 1?

They invest a lot of parental care to their offspring which is why their family sizes are smaller. Because time, energy and resources are invested into child rearing, K -selected species tend to have a Type 1 and Type 2 survivorship curve.

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. When a particular marine invertebrate species spawns, it releases thousands of eggs. The larvae spend months in the plankton before settling down into the substrate for the adult stage.

Why do organisms have a type 1 survivorship curve?

Because they become older and more susceptible to diseases and predation. Organisms showing type 1 survivorship curves tend to produce less number progeny and invest high energy in parental care.

Which is an example of an are strategist species?

Examples of r-strategist species are dogs, cats, insects, and fish. This natural tendency is visible when you look at a survivorship curve, which is a curve that depicts the number of survivors of a particular species at each stage of their life. Source: Google Images (Research Gate).

Which is the type of curve with the greatest probability of survival?

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).

How is the survival rate of an organism calculated?

The number or proportion of organisms surviving to any age is plotted on the y-axis (generally with a logarithmic scale starting with 1000 individuals), while their age (often as a proportion of maximum life span) is plotted on the x-axis.