Bestandsovervåking av jerv i 2016

• Main Authors: Brøseth, Henrik, Eklund, Ann, Höglund, Linda, Tovmo, Mari
• Format: Report
• Language: Norwegian Bokmål
• Published: 2016
• Subjects: Bestandsstatus for store rovdyr i Skandinavia; NINA Rapport; jerv; Gulo gulo; antall ynglinger; overvåking; bestandsutvikling; Skandinavia; järv; antal föryngringar; inventering; populationsutveckling; Skandinavien; Norway; sami
• Online Access: http://hdl.handle.net/11250/2419123

The Norwegian Environment Agency (Miljødirektoratet) and the Swedish Environmental Protection Agency (Naturvårdsverket) have drawn up common guidelines and a common methodology for the monitoring of wolverines, and these are in force in both Norway and Sweden since 2014. The population size and the population trend for wolverines in Scandinavia is monitored through the record of reproduction areas (territories) where reproductions have occurred during the late winter. The population size estimate is calculated annually based on the registrered number of wolverine reproductions that fulfil the common criterias for Documented or Certain reproduction. Most wolverine reproductions are monitored and registrered in the common database Rovbase by the field staff from the County Administration Boards (Länsstyrelserna) in Sweden and the Norwegian Nature Surveillance (Statens Naturoppsyn) in Norway. In Sweden, the Sami villages (administrative units for reindeer herding) are active in reporting suspected den sites that the field staff from the Country Administration Board then will evaluate in the field. During the wolverine monitoring of 2016, 108 wolverine reproductions were registered in Scandinavia, a decrease of 33 % in comparison to the 2015 result. Out of these, 58 reproductions were found in Sweden, and 50 were found in Norway. This corresponds to a 39 % decrease in Sweden and a 23 % decrease in Norway in comparison to the 2015 result. Based on the number of reproductions found during the years 2014–2016, the Scandinavian population size is estimated to 848 adult wolverines, defined as one year old or above (95 % CI = 716–1072), which represents a decrease of 8 % from last year’s estimate for Scandinavia as a whole. Out of the total 848 wolverines, an estimated 349 wolverines (95 % CI = 297–440) are found in the Norwegian part of the population, and 499 wolverines (95 % CI = 391–667) in the Swedish part of the population. The Norwegian part of the population has thus seen an increase of 4 % and the Swedish part of ...