Abstract
1. Utilizing population censuses and field experiments we investigated the dispersal behaviour and the role that dispersal plays in the population dynamics of the shoot-galling sawfly Euura lasiolepis. 2. Active, non-directional dispersal occurred out to 8 m, was strongly female biased (88% female) and relatively common (92% of dispersing sawflies). Passive, wind-directed dispersal occurred out to 128 m, was not female biased (56% female, the same sex ratio as emerging sawflies) and relatively rare (8 % of dispersing sawflies). 3. Dispersal was density-independent but increasing density decreased the number of galls per individual initiated by non-dispersers. 4. Life-table analysis was used, including field survivorship and sex ratio data, to model the role dispersal can play in the population dynamics of this sawfly
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