Graduate Thesis Or Dissertation
 

Fecundity and longevity in Tribolium castaneum : a selection experiment

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  • Recent experimental and theoretical work has examined the possible genetic causes of senescence. These are reviewed, and four types of factors are found to be responsible for the evolution of senescence and age specific fecundity curves: 1. Age specific mortality schedules, 2.Density dependent factors, 3. Density independent factors, 4. Random fluctuations in environmental conditions. A discussion of al leles with different age specific effects explores their behavior under a variety of mortal ity schedules. An experiment involving natural and artificial selection for high fecundity at 10 and 100 days of age in a laboratory population of Iriloilan LAatamgam resulted in significant increases in 100 day fecundity in al 1 lines. No change in 10 day fecundity was seen in any I ine. Percent mortal ity was not changed by selection. The heritabil ity of fecundity at 10 and 100 days was measured: heritabil ity was estimated to be .53 + .35 for 10 day fecundity and zero at 100 days. These results are shown to support the hypothesis that this I, cAliamlam population is polymorphic with respect to age specific fecundity distributions and that the life history strategy of this organism has been molded by fluctuating juvenile mortality.
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