Abstract
SummaryThe results of simulation experiments with a stochastic model incorporating internal and external sources of heterogeneity suggest that the western tent caterpillar is a risk spreader of a type discussed byDen Boer (1968). By maintaining physiological plasticity in its population, M.c. pluviale can survive periods of bad weather and then expand rapidly in an improved climate. Intrinsic variability in the moths’ dispersal capacity also ensures that some will continue to contribute to populations in the climatic refuges where the species persists during unfavorable periods, while others can quickly colonize marginal areas as soon as favorable conditions return. This northern population of the western tent caterpillar seems distinctly less well adapted to a world in which the terrain and the weather are more homogeneous than on the Saanich Peninsula.
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