Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2018
Abstract
No abstract has been registered
Authors
Atle Wehn HegnesAbstract
No abstract has been registered
Abstract
Questions : Land-cover maps are used for nature management, but can they be trusted? This study addresses three questions: (1) what is the magnitude of between field worker inconsistencies in land-cover maps and what may cause such inconsistencies; (2) in which ways and to what extent do spatial scale and mapping system influence inconsistencies between maps; and (3) are some biomes mapped more consistently than others, and if so, why? Location : Gravfjellet, Øystre Slidre municipality, southern Norway. Methods : Two different mapping systems, designed for mapping at different spatial scales, were used for parallel mapping by three different field workers, giving a total of six maps for the study area. Spatial consistency of the resulting maps was compared at two hierarchical levels for both systems. Results : The average pair-wise spatial consistency at the highest hierarchical level was 83% for both systems, while the average pair-wise spatial consistency at the lowest hierarchical level was 60.3% for the coarse system and 43.8% for the detailed system. Inconsistencies between maps were partly caused by the use of different land- cover units and partly by spatial displacement. Conclusions : Field workers made different maps despite using the same mapping systems, materials and methods. The differences were larger at lower hierarchical levels in the mapping systems and increased strongly with system complexity. Consistency among field workers should be estimated as a standard quality indicator in all field-based mapping programmes.
Authors
Daniel RasseAbstract
No abstract has been registered
Authors
Irene Biancarosa Ikram Belghit Christian Guido Bruckner Nina Sylvia Liland Rune Waagbø Heidi Amlund Svenja Heesch Erik-Jan LockAbstract
No abstract has been registered
Authors
Jan Alexander Lene Frost Andersen Nana Yaa Ohene Asare Dean Basic Edel Oddny Elvevoll Danica Grahek-Ogden Gro Ingunn Hemre Brit Kristine Hjeltnes Merete Hofshagen Åshild Krogdahl Torsten Källqvist Trond Rafoss Ida Skaar Janneche Utne Skåre Hilde-Gunn Opsahl Sorteberg Inger-Lise Steffensen Vigdis Vandvik Yngvild Wasteson Micael WendellAbstract
Source at <a href=https://vkm.no/>https://vkm.no/</a>
Authors
Jan Alexander Lene Frost Andersen Nana Yaa Ohene Asare Dean Basic Edel Oddny Elvevoll Danica Grahek-Ogden Gro Ingunn Hemre Brit Kristine Hjeltnes Merete Hofshagen Åshild Krogdahl Torsten Källqvist Trond Rafoss Ida Skaar Janneche Utne Skåre Hilde-Gunn Opsahl Sorteberg Inger-Lise Steffensen Vigdis Vandvik Yngvild Wasteson Micael WendellAbstract
Source at <a href=https://vkm.no/>https://vkm.no/</a>
Abstract
No abstract has been registered
Authors
Solveig Marie Stubsjøen Kristin Sørheim Matteo Chincarini Jon Bohlin Emma Brunberg Boris Fuchs Rupert Palme Lise GrøvaAbstract
Tick-borne fever (TBF), caused by the bacterium Anaplasma phagocytophilum and transmitted by the tick Ixodes ricinus, has considerable consequences for animal welfare and economy in the sheep industry. Non-invasive, objective methods to quantify chronic stress are needed in order to evaluate the welfare impact of disease. The aim of this study was 1) to evaluate hair cortisol (HC) and hair cortisone (HCn) as biomarkers of chronic stress in sheep with TBF and 2) to test whether there was an association between the development of TBF and con- centrations of HC, HCn and faecal cortisol metabolites (FCM) and body weight. The experiment took place in an area with a high prevalence of TBF, and thirty lambs were used in the study. Wool samples were collected in Week 0, in Week 3 (before turn out on homeland spring pasture), in Week 6 (before turn out on summer rangeland pasture) and at the end of the summer (Week 15). Faecal samples were collected every week (ie. Week 0–6 and Week 15). Symptoms of TBF developed in 15 lambs, of which all recovered from the disease after treatment with antibiotics. HC levels decreased progressively, and significantly, between Week 0, 3, 6 and 15 (p < 0.001), while HCn only decreased from Week 0 to Week 3 (p < 0.001) and then remained stable between Week 3–15. FCM increased between Week 0 and 5 (p = 0.027), and a significant association was found between increased FCM levels in Week 5 and lambs developing clinical signs of TBF (p = 0.022). We also found an association between lambs developing clinical signs of TBF and elevated HCn levels in Week 6 (p = 0.013). A slightly lower weight gain at later time points (Week 6 and 15) were found in the affected lambs compared to clinically healthy lambs. Our results indicate local production and/or metabolism of glucocorticoids in the hair follicles. This study strengthens our previous finding of a potential merit of hair cortisone as a biomarker of chronic stress in sheep.
Authors
Trond Rafoss Daniel Flø Leif Sundheim Per Hans Micael Wendell Guro Brodal Åshild Ergon Christer Magnusson Arild SlettenAbstract
No abstract has been registered