Survivorship Curves (College Board AP® Environmental Science): Flashcards
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Define survivorship curve.
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Cards in this collection (13)
Define survivorship curve.
A survivorship curve is a graph showing the pattern of survival within a population from birth to the maximum age reached by any individual.
What survival pattern does a Type I survivorship curve show?
A Type I curve shows high survival rates throughout most of the lifespan, with mortality increasing with age.
Define cohort.
A cohort is a group of individuals born at the same time.
A Type II survivorship curve shows a relatively mortality rate across all age classes.
A Type II survivorship curve shows a relatively constant mortality rate across all age classes.
True or False?
A Type III survivorship curve shows low mortality in early life.
False.
A Type III curve shows high mortality in early life, with high survival rates for those that reach adulthood.
What is the primary cause of death for species with a Type II survivorship curve?
Predation is the primary cause of death for species with a Type II survivorship curve.
Which survivorship curve do K-selected species usually follow?
K-selected species usually follow a Type I survivorship curve, or sometimes a Type II curve.
Which organisms typically show a Type III survivorship curve?
Insects, fish, and many plant and tree species typically show a Type III survivorship curve.
True or False?
r-selected species usually follow a Type I survivorship curve.
False.
r-selected species usually follow a Type III survivorship curve.
Which organisms typically show a Type I survivorship curve?
Humans, elephants, and other large mammals typically show a Type I survivorship curve.
Why do K-selected species have low infant mortality rates?
K-selected species have low infant mortality because they invest in parental care and in individual offspring.
What reproductive traits are typical of species with a Type III survivorship curve?
Species with a Type III curve typically produce great numbers of offspring and reproduce for most of their lifetime.
Why do many offspring of r-selected species die early?
Many r-selected offspring die early because of limited parental care and high vulnerability to environmental factors.
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