What animal has 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.
Are birds Type 2 survivorship 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.
Are frogs Type 2 survivorship curve?
Most frog species display a type III survivorship curve, where the death rate is very high early in life and much lower in the middle and older age groups.
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.
What animals have a Type 3 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 animal has a Type 1 survivorship curve?
Elephants have a Type I survivorship curve (mortality increases with age), and fecundity decreases with age.
What type of survivorship curve do rabbits have?
Such organisms follow the Type II or B curve of survivorship. Within these, there are some organisms (like butterflies and other insects) that lean more towards the A curve, and therefore follow a B1 curve. Likewise, organisms (like rabbits, mice) that lean more towards the C curve, are said to be following a B2 curve.
What are Type 2 species?
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.
What survivorship type 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).
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.