survivorship curve
Type I, II, and III survivorship curves. A survivorship curve is the graphic representation of the number of individuals in a population that can be expected to survive to any specific age.
Type II survivorship curve
statistics
Type II survivorship curve, in ecology, a curve displayed on a semilogarithmic scale that tracks organisms whose mortality (or survivorship) remains relatively constant regardless of age. Survivorship curves can be created by plotting the number of those members of a cohort that are still alive at each age. The Type II survivorship curve is presented as a straight line, with a constant slope, that decreases over time toward zero.
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Certain lizards, perching birds, and rodents exhibit this type of survivorship curve. In some species that produce many offspring but provide little care for them (that is, r-selected species), mortality is greatest among the youngest individuals.