Parasite avoidance: the cause of post-calving migrations in Rangifer?
Intensities of warble fly larvae, Hypoderma tarandi (L.), were examined in slaughtered reindeer (Rangifer tarandus tarandus L.) from different summer grazing areas of Finnmark County, northern Norway. To test the hypothesis that larval abundance decreases with increase in post-calving migration dist...
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Canadian Science Publishing
1991
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Online Access: | http://dx.doi.org/10.1139/z91-340 http://www.nrcresearchpress.com/doi/pdf/10.1139/z91-340 |
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crcansciencepubl:10.1139/z91-340 2024-09-15T18:06:13+00:00 Parasite avoidance: the cause of post-calving migrations in Rangifer? Folstad, Ivar Nilssen, Arne C. Halvorsen, Odd Andersen, Johan 1991 http://dx.doi.org/10.1139/z91-340 http://www.nrcresearchpress.com/doi/pdf/10.1139/z91-340 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 69, issue 9, page 2423-2429 ISSN 0008-4301 1480-3283 journal-article 1991 crcansciencepubl https://doi.org/10.1139/z91-340 2024-08-08T04:13:40Z Intensities of warble fly larvae, Hypoderma tarandi (L.), were examined in slaughtered reindeer (Rangifer tarandus tarandus L.) from different summer grazing areas of Finnmark County, northern Norway. To test the hypothesis that larval abundance decreases with increase in post-calving migration distance (i.e., distance from calving grounds), herds with differing migration distances were sampled. The prevalence of infection in the total sample of 1168 animals was 99.9%. The study revealed significant differences in larval abundance among herds from different summer grazing areas. Herds with post-calving migrations have significantly lower larval abundances than herds remaining on or near the calving grounds for the whole summer. Between-herds variation in abundance of H. tarandi larvae is assumed to reflect differing densities of the infective stage (adult flies) on the herds' summer ranges. Larval abundance in a herd is in turn negatively correlated with the distance between the main larval shedding areas (i.e., calving grounds) and the areas of greatest transmission (i.e., summer pastures). These results are discussed in relation to transmission of other parasites common to Rangifer and suggest that this host's post-calving migration may be a behavioural adaptation that reduces levels of parasitic infections. Article in Journal/Newspaper Finnmark Northern Norway Rangifer tarandus Finnmark Canadian Science Publishing Canadian Journal of Zoology 69 9 2423 2429 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Intensities of warble fly larvae, Hypoderma tarandi (L.), were examined in slaughtered reindeer (Rangifer tarandus tarandus L.) from different summer grazing areas of Finnmark County, northern Norway. To test the hypothesis that larval abundance decreases with increase in post-calving migration distance (i.e., distance from calving grounds), herds with differing migration distances were sampled. The prevalence of infection in the total sample of 1168 animals was 99.9%. The study revealed significant differences in larval abundance among herds from different summer grazing areas. Herds with post-calving migrations have significantly lower larval abundances than herds remaining on or near the calving grounds for the whole summer. Between-herds variation in abundance of H. tarandi larvae is assumed to reflect differing densities of the infective stage (adult flies) on the herds' summer ranges. Larval abundance in a herd is in turn negatively correlated with the distance between the main larval shedding areas (i.e., calving grounds) and the areas of greatest transmission (i.e., summer pastures). These results are discussed in relation to transmission of other parasites common to Rangifer and suggest that this host's post-calving migration may be a behavioural adaptation that reduces levels of parasitic infections. |
format |
Article in Journal/Newspaper |
author |
Folstad, Ivar Nilssen, Arne C. Halvorsen, Odd Andersen, Johan |
spellingShingle |
Folstad, Ivar Nilssen, Arne C. Halvorsen, Odd Andersen, Johan Parasite avoidance: the cause of post-calving migrations in Rangifer? |
author_facet |
Folstad, Ivar Nilssen, Arne C. Halvorsen, Odd Andersen, Johan |
author_sort |
Folstad, Ivar |
title |
Parasite avoidance: the cause of post-calving migrations in Rangifer? |
title_short |
Parasite avoidance: the cause of post-calving migrations in Rangifer? |
title_full |
Parasite avoidance: the cause of post-calving migrations in Rangifer? |
title_fullStr |
Parasite avoidance: the cause of post-calving migrations in Rangifer? |
title_full_unstemmed |
Parasite avoidance: the cause of post-calving migrations in Rangifer? |
title_sort |
parasite avoidance: the cause of post-calving migrations in rangifer? |
publisher |
Canadian Science Publishing |
publishDate |
1991 |
url |
http://dx.doi.org/10.1139/z91-340 http://www.nrcresearchpress.com/doi/pdf/10.1139/z91-340 |
genre |
Finnmark Northern Norway Rangifer tarandus Finnmark |
genre_facet |
Finnmark Northern Norway Rangifer tarandus Finnmark |
op_source |
Canadian Journal of Zoology volume 69, issue 9, page 2423-2429 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z91-340 |
container_title |
Canadian Journal of Zoology |
container_volume |
69 |
container_issue |
9 |
container_start_page |
2423 |
op_container_end_page |
2429 |
_version_ |
1810443711935414272 |