The Development and Expression of Population Tables for the Bark Beetle Scolytus scolytus (F.)

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Abstract
A population of S. scolytus was sampled at intervals during 1 year to determine the changes in the population with time and their causes. Because there is considerable overlap in the stages of development present at one time, the results are expressed not as a life table, but as a series of population tables, each representing the structure of the population at one sampling time. The changes in the numbers alive and in mortality in the various stages are followed by combining the tables graphically. The changes with time in mortality due to parasites and predators agree well with information from field observations. The change in the fourth and fifth instar larval population accounts for most of the change in the total live population. This is, therefore, the key stage of development. The ratio of parents to offspring indicates a declining population in the area considered.

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