![]() Reference level: The reference level for the Arctic fox can be defined as a relatively stable population with some interannual variations.Īction limit: Consistent decline in the population over time linked to climate drivers or hunting, where the population trend can no longer support harvesting. This information is exempt from public disclosure. Information about the sites can be found in the Norwegian Polar Institute’s Arctic fox den database. QualityĪdequate training of personnel is provided by a responsible person at the Norwegian Polar Institute. Since 2012, wildlife cameras have been used to validate the observation method and give more reliable cub numbers in each den. Mortality in cubs during the denning period varies from one year to another, and can also influence data on litter size. The use of camera boxes at the dens reduces this underestimation. To reduce the errors, the personnel try postpone the registration until after the adult foxes have visited the den, if this is practical. ![]() Litter sizes can also be underestimated because all the cubs from one den are rarely outside the den at the same time. To reduce this error, the monitoring should be carried out as early as possible, but that can also lead to underestimating the number of dens as some litters are born late. This may result in too many litters being recorded in an area. The foxes may move the cubs or divide them between several dens. Fresh prey remains and faeces are then used as indication of the den being used. If no cubs are observed, the den is inspected. Automatic cameras (game cameras) at the dens.Ĭontinuous observation of each den are performed using monocular and telescopes from fixed locations for at least 2 hours or until adult foxes visit the den.Observation using binoculars/telescope from fixed points at a safe distance from the dens so that they are not disturbed.This den monitoring is based around two methods: Known breeding dens in both study areas are observed during the period from around 25 June to around 28 August.
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