Monitoring Effects of Highway Traffic on Wild Reindeer

Some of the major wildlife problems associated with transport infrastructure development in Norway involve the negative effects on reindeer populations. Documented effects include barrier effects resulting in fragmented populations and indirect impacts on reindeer grazing caused by disturbance from road traffic and human activities in general. Wild reindeer are sensitive to disturbance and are known to have high alertness and tend to be extremely shy of human activities. The disturbance caused by road traffic and human activities can reduce the reindeer's use of areas for large distances (several kilometres) on either side of roads. The result of this avoidance is a reduction in the available grazing resources, which during the winter consist mainly of lichens, in wide zones parallel to roads, and an equivalent increase in grazing pressure in a zone at some distance from roads in undisturbed areas. Because lichens needs 20 – 30 years to recover after periods of intensive grazing, the wild reindeer are regarded as especially vulnerable to barriers that reduce their possibilities to reach new grazing grounds. At the Hardangervidda, the biggest mountain plateau in Southern Norway, the functional use of the wild reindeer area has probably changed from being a large-scale rotation in the use of the food resources and calving areas, to a more restricted use of a smaller and central area, becoming an overexploitation of a too small area. The northern parts of the Hardangervidda, for example, are functionally parted from the rest by Highway (Hw) 7 and the railroad. This situation is not unique to the northern parts of Hardangervidda, but appears to be a general problem for most of the edges, and many of the surrounding of the plateau areas that also happen to be most affected by humans and are no longer used by the reindeer. The Norwegian directorate for nature management has suggested closing down a stretch of about 40 km of Hw 7 crossing the Hardangervidda, during the winter months. The aim is to resume reindeer habitat use in this part of the area. Even if the road has very low traffic in the winter months (ADT 300-400), the suggestion has caused a lot of protests and discussions locally. In 2002 scientists from the Norwegian Institute of Nature Research (NINA) were engaged by the Norwegian Public Roads Administration (NPRA) in a five-year study to undertake research on patterns of reindeer habitat use and utilization of the lichen grazing resources and on the movements of wild reindeer in the areas believed to be influenced by the road. The main purpose of the project is to find out to which degree the road and/or the traffic generated by the road constitute a barrier for the wild reindeer, and if it has a repelling effect on the animals. The NPRA will draw up its recommendation to the Parliament on the future management of the road based on the results of the project. The project has equipped a total of more than 20 animals with GPS transmitters, providing continuous detailed and accurate data on their habitat use and movements. The GPS units are programmed to register each animal each third hour. The data are stored in the computer in the collar, which includes a possibility for remote data transfer, and the computer is programmed to deliver the data every second week. The collar also sends out a VHF signal, so the animal can be tracked, and the data downloaded to a portable computer. Because the fragmentation is the result of the cumulative effects of different disturbance sources, the project also aims to look into the relative contribution level of disturbance from other sources than road traffic, e.g., power lines, the settlement of cottages and alpine resorts, and recreational use by skiers and snow scooters. Maps of the distribution of different reindeer food resources (e.g., lichens) have been produced both by using field surveys and by the use of satellite images. When the preliminary GPS data are compared with the distribution of lichen resources in the area, it is clear that the animals do not use the areas richest in lichens: going to the outskirts of the plateau and in a zone 5 – 7 km from the road. This zone of avoidance also strengthens the barrier effect of the road such that the migration routes to and from the North are more or less cut off. This is both a problem of reduced genetic flow, and the availability of winter grazing resources. The field work closes in 2005, and the results will be presented in 2006. The data will hopefully also give valuable information about the relative disturbance from other disturbance factors, so that action can be taken based on the right factors. Future research should focus more on the relative and cumulative effects of different disturbance factors, and whether placing selected stretches of the road in tunnels can eliminate or reduce the negative effects on reindeer.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Maps; Photos; References;
  • Pagination: pp 292-300
  • Monograph Title: Proceedings of the 2005 International Conference on Ecology and Transportation (ICOET 2005)

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Filing Info

  • Accession Number: 01567195
  • Record Type: Publication
  • ISBN: 0977809412
  • Files: TRIS
  • Created Date: Jun 24 2015 1:28PM