Wild and semi-domesticated reindeer graze freely on natural pastures in Norway, often sharing these with domestic sheep and other domestic and wild ruminants. In this study, faecal samples from wild reindeer and domestic sheep were collected from two areas in southern Norway and analysed to assess the occurrence and assemblage of Among 162 wild reindeer samples, 25 (15%) were positive for , showing high infection intensities, with most of the samples belonging to sub-assemblage AI, which has zoonotic potential. Interestingly, this study did not detect subassemblage AIII, known to be found in wild ruminants. Among 45 sheep samples, 13 (29%) were positive, with most belonging to assemblage E. The finding of predominantly assemblage AI in the reindeer was surprising, particularly given the large proportion of sheep shedding assemblage E cysts. As the number of sheep on these natural pastures far outnumbers the wild reindeer, it is intriguing that they do not seem to share assemblages.
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http://dx.doi.org/10.1016/j.ijppaw.2024.101004 | DOI Listing |
Prev Vet Med
January 2025
Department of Veterinary Population Medicine, University of Minnesota, St. Paul, MN, 225 Vet Med Ctr, 1365 Gortner Avenue, St. Paul, MN 55108, United States. Electronic address:
The objective of this study was to evaluate biosecurity practices related to chronic wasting disease (CWD) transmission pathways and prevention in active cervid herds in Minnesota in 2019 by species, size and location of herds. A self-administered questionnaire was sent to all cervid producers in Minnesota to gather demographic, management, and biosecurity practices. Among producers (N=136), 63.
View Article and Find Full Text PDFCommun Biol
November 2024
School of Earth Sciences, Ohio State University, Columbus, OH, USA.
Extreme weather events are becoming more frequent, with poorly known consequences for wildlife. In December 2021, an atmospheric river brought record-shattering amounts of rain and snow to interior Alaska, creating conditions expected to cause mass mortality in grazing ungulate populations that need to access ground forage. We characterized snowpack conditions following the storm and used a 36-year monitoring dataset to quantify impacts on caribou (Rangifer tarandus) and their primary predator, wolves (Canis lupus).
View Article and Find Full Text PDFInt J Parasitol Parasites Wildl
December 2024
Parasitology, Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway.
Wild and semi-domesticated reindeer graze freely on natural pastures in Norway, often sharing these with domestic sheep and other domestic and wild ruminants. In this study, faecal samples from wild reindeer and domestic sheep were collected from two areas in southern Norway and analysed to assess the occurrence and assemblage of Among 162 wild reindeer samples, 25 (15%) were positive for , showing high infection intensities, with most of the samples belonging to sub-assemblage AI, which has zoonotic potential. Interestingly, this study did not detect subassemblage AIII, known to be found in wild ruminants.
View Article and Find Full Text PDFJ Anim Ecol
December 2024
Department of Biology, Centre for Biodiversity Dynamics, Norwegian University of Science and Technology, Trondheim, Norway.
Indirect interspecific effects (IIEs) occur when one species affects another through a third intermediary species. Understanding the role of IIEs in population dynamics is key for predicting community-level impacts of environmental change. Yet, empirically teasing apart IIEs from other interactions and population drivers has proven challenging and data-demanding, particularly in species-rich communities.
View Article and Find Full Text PDFJ Anat
January 2025
Centre for Saami Studies, UiT the Arctic University of Norway, Tromsø, Norway.
Counting growth layers in dentine and/or secondary cementum is widely used for age determination in wild mammals but the underlying seasonal changes in the structure and degree of mineralisation of dental tissue have not been well characterised. We embedded first (m1) and second (m2) mandibular permanent molar teeth from a 12-year-old female Svalbard reindeer (Rangifer tarandus platyrhynchus) in PolyMethylMethAcrylate (PMMA), prepared cut and polished surfaces coated with evaporated carbon and used 20 kV back-scattered electron imaging in a scanning electron microscope (BSE-SEM) to study aspects of dental tissue structure which depend on the degree of mineralisation at the micron and sub-micron scale. BSE-SEM revealed differences between the mineral content of growth layers (annulations) in the secondary cementum and the primary and secondary dentine, the latter, incidentally, still forming at death in m1.
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