Abstract
Age-related changes in the mobility of adult Monochamus alternatus was analysed by repeated weekly marking and recapture in a stand of Pinus thunbergii. During periods of adult emergence in 1980-1983, 1-5 day old adults, which had emerged in field cages, were released. The proportion of beetles recaptured a week after release decreased with ages up to 17 days after emergence. After the age of 17 or 24 days they were caught at an almost constant rate. Wild beetles were also caught, marked individually, and released in the same stand. The proportion of wild beetles recaptured a weel after release was about 10% in June and July, and about 20% in August and September. These results suggest that the beetles' mobility rose from the time of emergence to the time of reproductive maturation, at which point it dropped.
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