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- Moberg, Christina, et al.
(författare)
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De unga gör helt rätt när de stämmer staten
- 2022
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Ingår i: Aftonbladet. - 1103-9000.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- 1 620 forskare och lärare i forskarvärlden: Vi ställer oss bakom Auroras klimatkrav
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| 5. |
- Aronson, Åke, et al.
(författare)
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Ulv i Skandinavia : Statusrapport for vinteren 2009-2010
- 2010
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The wolves in Sweden and Norway are members of a joint Scandinavian wolf population. In a combined Swedish-Norwegian monitoring project, wolves on the Scandinavian Peninsula were located and counted during the winter of 2009-2010. In Sweden, County administrative boards perform the fieldwork and collection of field data (snow-tracking, DNA-samples), whereas the Wildlife Damage Center (VSC) at Grimsö Research Station was responsible for evaluating and summarizing the results of the wolf monitoring. In Norway, wolf biologists at Hedmark University College and a genetist at Rovdata (Trondheim) in cooperation with the Norwegian Nature Inspectorate (SNO) were responsible for the monitoring of resident and non-resident wolves, respectively. Furthermore, cooperative wolf pack monitoring has been carried out in Fennoscandia in collaboration with Finland. A large number of volunteers and organizations such as hunting associations in both countries and the Swedish Carnivore Association also report observations and participate in wolf monitoring activities. The estimated number of wolves in Scandinavia is mainly based on long distances of ground tracking on snow, but also by radio-telemetry and DNA-analysis. The estimate was restricted to the period of October 1, 2009 – February 28, 2010. To guarantee the quality of the reports used, the majority have been checked in the field by the project, or by other personnel with experience of ground tracking wolves on snow. Wolves were classified as 1) family groups (packs), 2) scent-marking pairs, 3) other resident wolves, or 4) other wolves. The results were presented as minimum-maximum numbers where the minimum was exclusively based on confirmed field-checked reports, while the maximum also included other reports. A total of 252-291 wolves were estimated on the Scandinavian Peninsula during the 2009-2010 winter. Among these, 28 packs included 165-175 wolves, and 44-49 wolves belonged to 21-24 scent-marking pairs. The majority of the wolves (186-215) were located in Sweden. Of the 33-39 wolves restricted to Norway, 21-23 were members of 3 packs, 6 were scent-marking pair members, none were classified as “other resident wolves”, and 6-10 were classified as “other wolves”. Areas were utilized on both sides of the national border between Sweden and Norway by 33-37 resident wolves. Successful reproduction in the spring of 2009 was confirmed in 26 of the Scandinavian wolf territories. Among these, 19 litters were born in Sweden, 4 litters was born in a transboundary packs, and 3 litters grew up in Norway. In 2009, two Finnish-Russian male wolves reproduced for the second time, one litter in Sweden (the Galven territory) and one in Norway (the Kynna territory). In Finland, during the winter 2009-10, a total of 76-78 wolves in 15 packs were estimated to have exclusively Finnish territories. In addition 72-74 wolves were pack members within 13 territories across the Finnish-Russian border
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| 6. |
- Aronson, Åke, et al.
(författare)
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Ulv i Skandinavia : statusrapport for vinteren 2010-2011
- 2011
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The wolves in Sweden and Norway are members of a joint Scandinavian wolf population. In a combined Swedish-Norwegian monitoring project, wolves on the Scandinavian Peninsula were located and counted during the winter of 2010-2011. In Sweden, County administrative boards perform the fieldwork and collection of field data (snow-tracking, DNA-samples), whereas the Wildlife Damage Center (VSC) at Grimsö Research Station was responsible for evaluating and summarizing the results of the wolf monitoring. In Norway, wolf biologists at Hedmark University College and a genetist at Rovdata (Trondheim) in cooperation with the Norwegian Nature Inspectorate (SNO) were responsible for the monitoring of resident and non-resident wolves, respectively. Furthermore, cooperative wolf pack monitoring has been carried out in Fennoscandia in collaboration with Finland. A large number of volunteers and organizations such as hunting associations in both countries and the Swedish Carnivore Association also report observations and participate in wolf monitoring activities. The estimated number of wolves in Scandinavia is mainly based on long distances of ground tracking on snow, but also by DNA-analysis and radio-telemetry. The estimate was restricted to the period of October 1, 2010 – February 28, 2011. To guarantee the quality of the reports used, the majority have been checked in the field by the project, or by other personnel with experience of ground tracking wolves on snow. Wolves were classified as 1) family groups (packs), 2) scent-marking pairs, 3) other resident wolves, or 4) other wolves. The results were presented as minimum-maximum numbers where the minimum was exclusively based on confirmed field-checked reports, while the maximum also included other reports. A total of 289-325 wolves were estimated on the Scandinavian Peninsula during the 2010-2011 winter. Among these, 31 packs included 183-189 wolves, and 57-61 wolves belonged to 27-30 scent-marking pairs. The majority of the wolves (235-266) were located in Sweden, of which 149-154 were members of 25 packs, 43-44 lived in 20-22 scent-marking pairs, 4 were classified as “other resident wolves”, and 39-64 were classified as “other wolves”. Of the 32-34 wolves restricted to Norway, 18-19 were members of 3 packs, 8 were scent-marking pair members, one was classified as “other resident wolves”, and 5-6 were classified as “other wolves”. Another 22-25 resident wolves lived in 6-7 packs or scent-marking pairs in territories covering areas on both sides of the Swedish-Norwegian border. Successful reproduction in spring 2010 was confirmed in 31 of the Scandinavian wolf territories. Among these, 25 litters were born in Sweden, 3 litters were born in transboundary packs, and 3 litters grew up in Norway. In 2010, two Finnish-Russian male wolves reproduced for the third time, one litter in Sweden (the Galven territory) and one in Norway (the Kynna territory). In Finland, during the winter 2010-11, a total of 48 wolves in 8 packs were estimated to have exclusively Finnish territories. In addition 59-64 wolves were pack members within 11 territories across the Finnish-Russian border
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| 9. |
- Chapron, Guillaume, et al.
(författare)
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Estimating wolf (Canis lupus) population size from number of packs and an individual based model
- 2016
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Ingår i: Ecological Modelling. - : Elsevier BV. - 0304-3800 .- 1872-7026. ; 339, s. 33-44
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Tidskriftsartikel (refereegranskat)abstract
- Estimating wildlife population-size is fundamental for wildlife management and conservation. However, making monitoring of population size less resource demanding while still keeping a high monitoring accuracy and precision remains a recurrent challenge. One proposed alternative to count individuals is to instead focus on counting a segment of the population that is easier to monitor but at the same time well informative on total population size. We show how total population size can be estimated from group counts by using an individual-based population model in a social living species. We developed a wolf (Canis lupus) specific Individual Based Model and used Approximate Bayesian Computation (ABC) to fit this population model to the time series of annual number of packs, reproductions and pairs obtained from Scandinavian monitoring data. Model informative priors were obtained with data from collared individuals by the Scandinavian wolf research project. The fitted model was then used to estimate a conversion factor from number of packs to total number of individuals and to number of reproductions. There was a good fit between the retained simulations by ABC and the observed Scandinavian wolf population trajectory. The fitted simulations returned a conversion factor of 8.0 (95% CI = 6.62-10.07) from number of packs to total population size and of 1.0 (95% CI = 0.93-1.12) to number of reproductions in December. A sensitivity analysis revealed that the conversion factor from packs to total population size was positively correlated with pup survival and litter size and negatively correlated with subadult, vagrant and adult survivals. Using an individual based model allowed us to model the full complexity of demographic traits of a social-living species such as the wolf. The flexibility of the model also meant that the conversion factor could be estimated for any month during the year. Our approach to estimate total population size from counts of groups requires having a population model where both individuals and groups are explicitly described and can be applied to other wolf populations and group-living species where counting all individuals over a large area is unfeasible.
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