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Schematic presentation of individual senescence in Drosophila (A) and medfly (B). There is a crucial difference in senescence between the species. In Drosophila, a constant length of maturity exists so that the only parameter associated with longevity is the exponent of the fecundity decrease. Schematic patterns (A) present the original patterns shown in Figure 8. In medfly, both the maturity period and the exponent are prolonged with the increase of life span.
