Population estimates and dispersal of Hydrotaea irritans Fallén

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Abstract
1. Population estimates of Hydrotaea irritans were made by a mark and recapture technique at one site from 1976 to 1978.2. Population densities of five to 200 thousand ha‐1 were found with large‐scale immigration and emigration occurring from the site.3. The dispersal of marked adults from a point of release was rapid and marked flies were captured up to 3 km from the release point.4. The distribution of flies along a woodland strip was not homogeneous; certain areas appeared to be more attractive and held more flies over a period of time.5. The importance of the increasing area within which flies may be found as they move outwards from the release point is discussed.