Type III curve shows high early death rates but the death rate slows for those individuals who have. A Type II curve shows a death rate is more constant throughout the lifetime of the species. Discuss whether it is a type I, II, or III survivorship curve.ĭraw (graph) a survivorship curves of the sheep off the reserve. A Type I curve shows a low death rate in early and middle life but the death rate increases steeply in old age.
Based on this info:ĭraw (graph) a survivorship curves of the sheep on the reserve.
The vast majority of sheep on the reserve live to be quite old in comparison to those on the mountain range outside the reserve, where sheep show fairly even mortality throughout their lives. Extra food is also provided to sheep on the reserve and so the population has very low rates of juvenile mortality. The sheep population continues to grow until it levels off at some point after approximately a decade.Ī) Draw a graph that shows the size of the bighorn population over time (and thus the population growth rate), starting the day the reserve size was doubled and ending two decades later.ī) Explain if and where the graph shows: exponential growth, logistic growth, r, N, and carrying capacity (K), as well as the interactions between these variables (e.g., where N approaches K).Ĭ) Many predators are excluded from the reserve. At that point, managers realize the habitat area is too small for the growing bighorn population and so they are able to double the size of the reserve. The population grows rapidly initially, then begins to slow and taper off after there are just over 100 sheep.
#TYPE 3 SURVIVORSHIP CURVE FULL#
In an effort to prevent extinction of desert bighorn sheep, a few individuals are brought to an isolated mountain range full of open habitat and the sheep are allowed to breed.
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