Abstract
Temporal mortality in 1346 mud-cells of Zeta abdominale (Drury) (Eumenidae) was studied for 13 monthly cohorts (or seven indiscrete generations) of the species at Bushy Park, Jamaica. Time specific life tables for the cohorts are presented showing that monthly fluctuations in the number of eggs entering the population (i.e. population size) as well as in mortality, occurred. Application of the key-factor analysis showed that the major mortality factors causing population changes could be identified by 'visual correlation'. These were 'cell disappearance', and death of larvae and prepupae from predation by Melittobia sp. (hawaiiensis complex) (Eulophidae). Apart from Melittobia, the only other important predator was Amobia floridensis Townsend (Sarcophagidae), but neither of them acted as direct density-dependent factors. While Amobia predation was independent of prey density, Melittobia acted as a delayed density-dependent factor on Zeta abdominale.
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