Abstract
Census data from an outbreaking population of the pine looper moth, Bupalus piniaria L. (Lepidoptera: Geometridae) are used to derive a life-table for the population. A comparative analysis is made of this life-table with one published for a non-outbreaking population of the moth. The stage-specific survival rates are found to exhibit qualitatively similar patterns, though the absolute survival rates differ substantially in some cases. There is evidence for the operation of density-dependent processes at several points in the moth's life-cycle. The results of published experimental studies are used in deriving proposals for the mechanisms underlying the patterns of stage-specific survival. Finally, it is suggested that the underlying mechanisms are fundamentally similar in both populations and that differing environmental conditions modulate the differential expression of these mechanisms in the two populations, so generating the observed differences in their population dynamics
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