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Test: ACT Science
Survivorship curves are constructed and used to compare population growth and survival between species. A Type I curve is characterized by a population whose individuals live to old age, indicating that there is high survivorship in the early and middle years. These individuals produce few offspring and have long periods of parental care. In a Type II curve, there is a constant survivorship across the individuals’ life spans. A Type III curve is characterized by a population of individuals that possess low survivorship early in age; however, this is followed by high survivorship of older individuals. These species produce large numbers of offspring with little or no parental care. Figure 1 is a graphical representation of these curves.
| 9. | Which of the following organisms is likely to possess a type 1 curve? |
A large mammal that has 1 to 2 offspring per lifetime
A fish species that produces many offspring per annual reproductive event
A rodent that has several offspring per annual reproductive event
None of these species possess a type 3 survivorship curve.
