Genetic subdivision and small population size can have considerable evolutionary consequences, as illustrated by studies of the cynipid gallwasp Andricus quercuscalicis which has recently colonised large areas of Western Europe. Population processes associated with colonisation were investigated by allozyme analysis of 1400 wasps in 57 populations. Patterns of genetic variation showed that very severe serial genetic subsampling occurred in a westerly direction which generated diverse new genetic combinations in the invaded range. Colonisation appeared to occur with very small numbers of founders reaching suitable habitat patches, and invasion progressed in a generally linear directional 'stepping-stone' pattern with topography dictating the routes of colonisation. The genetic structure of colonising or subdivided insect populations is reviewed.
|Title of host publication||FRONTIERS OF POPULATION ECOLOGY|
|Editors||RB Floyd, AW Sheppard, PJ DeBarro|
|Place of Publication||EAST MELBOURNE|
|Publisher||Royal Institute of Chartered Surveyors|
|Number of pages||11|
|Publication status||Published - 1996|