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Figure 25.2. (A) The hazard or force of mortality curves of the normal-lived Ra strain and of two long-lived strains (La and 2La) sequentially derived from it by a direct selection for delayed female fecundity. Each mortality curve is based on the age-specific values obtained from two or three replicate cohorts consisting of at least 250 mixed sex individuals each and was calculated using the Kaplan-Meier survival procedure in SPSS v.7. See Figure 25.1Afor statistical significance. (B) The hazard or force of mortality curves of the normal-lived Ra strain and the PQR strain selected from it by direct selection for paraquat resistance. Each mortality curve is based on the age-specific values obtained from mixed sex cohorts of 250-450 animals each and was calculated using the Kaplan-Meier survival procedure in SPSS v.7. See Figure 25.1B for statistical significance. (C) The hazard or force of mortality curves of the normal-lived Ra control strain and the longer-lived Ra heat-treated strain. The animals were subjected to a nonlethal heat shock (37°C for 90 minutes) early in life at days 5-7 after eclosion. They were then maintained under controlled optimal conditions, and their survival was monitored. The mortality curve was calculated using the Kaplan-Meier survival procedure in SPSS v.7. See Figure 25.1C for statistical significance. (After Arking et al., 2002)

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