Computer simulated host selection in Ips typographus
1989
Gries, G. | Nolte, R. | Sanders, W.
Foraging behaviour by Ips typographus L. (Coleoptera; Scolytidae) was simulated to assess host finding and reproductive success of beetles following four different strategies: 1. random search, 2. upwind search, in which beetles follow a prevailing flight direction, 3. random search with short range olfactory attraction to susceptible trees (primary attraction), and 4. upwind search with primary attraction. For each strategy we varied three parameters in equidistant steps including number of susceptible trees per hectare (0.06-0.33), population size (200-1000 beetles), and flight capacity (500-3000 m). All possible combinations of these parameters were tested in 12 replicates with more than 400 000 imaginary beetles flown through the simulated forest. Reproductive success of strategy 4, which combined upwind flight with primary attraction, exceeded that of the other strategies (1-3) circa 27, 7, and 4 times, respectively. In random search, maintenance of the population required a flight capacity, population size and host tree abundance which are unlikely to occur at suboutbreak levels in nature.
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