Trees, marine invertebrates, and
most fish have a Type III survivorship curve
. In a Type III curve, very few organisms survive their younger years. However, the lucky ones that make it through youth are likely to have pretty long lives after that.
What animal has a Type 2 survivorship curve?
any age, shown by the Type II survivorship curve, is evident as a straight line with a constant slope that decreases over time toward zero. Certain
lizards, perching birds, and rodents
exhibit this type of survivorship curve.
What is a Type III survivorship?
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
. This type of survivorship curve is drawn as a concave curve on a graph.
What animals have a Type 1 survivorship curve?
Elephants
have a Type I survivorship curve (mortality increases with age), and fecundity decreases with age.
Why do fish have a Type 3 survivorship curve?
Type III. Trees, marine invertebrates, and most fish have a Type III survivorship curve. In a Type III curve,
very few organisms survive their younger years
. However, the lucky ones that make it through youth are likely to have pretty long lives after that.
Why are trees Type 3 survivorship curves?
Trees have a Type III survivorship curve because
very few survive the younger years, but after a certain age, individuals are much more likely to survive
. The Type III survivorship curve is represented by a concave curve, which initially declines rapidly and then flattens.
Is turtle 3 a survivorship?
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 an example of a Type 3 organism?
Examples include
lizards, hydra, and some small mammals
. Type III individuals initially have a rather low chance of survival. Those that do survive may live to an advanced age. Examples include many fish and other marine organisms.
What type of survivorship are rabbits?
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 are the types of survivorship?
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 are the differences between Type 1 2 and 3 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.
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 type of survivorship curve do sea 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.
What is AK strategist species?
K-selected species, also called K-strategist,
species whose populations fluctuate at or near the carrying capacity (K) of the environment in which they reside
. Such species make up one of the two generalized life-history strategies posited by American ecologist Robert MacArthur and American biologist Edward O.
What does it mean to say that most large mammals have Type 1 survivorship curves?
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.
Are turtles Type 2 survivorship curve?
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
.
