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Intensities o f warble fly larvae Hypoderma tarandi (L.) were examined in slaughtered reindeer Rangifer tarandus tarandus (L.) from different summer grazing areas o f Finnmark county, N o r t h e r n Norway. To test the hypothesis that larval abundance decreases as post-calving migration distance increases (i.e. distance from calvinggrounds), herds with differing migration lengths were sampled. T h e prevalence o f infection in the total sample o f 1232 animals was 99.9%. T h e study reveals significant differences in larval abundance between herds from different summer grazing areas. H e r d s with post-calving migrations have significantly lower larval abundances than herds remaining on the calving grounds the whole summer. T h e between herd variation in H.tarandi larval abundance was assumed to reflect differing densities o f the infective stage on the herd's summer ranges. Larval abundance, in turn, is negatively correlated with the distance between the main larval shedding area (i.e. calving grounds) and the area o f infection (i.e. summer pastures). T h i s has led to the new hypothesis that the post-calving migration, common in wild reindeer, is a behavioural adaptation which reduces levels o f warble fly infections. Rangifer, Special Issue No. 3, 1990: 239 Rangifer, Special Issue No. 3, 1990. 239

rangifer

Abundance of warble fly larvae Hypoderma tarandi (L.) (Diptera:oestridae) in reindeer Rangifer tarandus tarandus (L.) and its relation to reindeer postcalving migration