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.
2014
Authors
Emir Malikov Subal Chandra KumbhakarAbstract
No abstract has been registered
Authors
Arnstein Øvrum Elling BereAbstract
To assess impacts of the nationwide Norwegian School Fruit Scheme (NSFS) using nationally representative data. The NSFS is organized such that primary-school children (grades 1–7) are randomly assigned to one of three school fruit arrangements: (i) the child receives one free fruit or vegetable per day; (ii) the child is given the option to subscribe to one fruit or vegetable per day at a subsidized price; and (iii) the child attends a school that has no school fruit arrangement. Data from an Internet survey are used to compare child and parental fruit and vegetable intakes across the three NSFS groups focusing mainly on groups (i) and (iii). The analysis was conducted using multivariate regression techniques. Parents of primary-school children (n 1423) who report on behalf of themselves and their children. Children who receive free school fruit eat on average 0·36 more fruit portions daily – or 25·0 % more fruits – than children who attend schools with no fruit arrangement (P < 0·001). Moreover, parents of children who receive free school fruit eat on average 0·19 more fruit portions daily – or 12·5 % more fruits – than parents of children who attend schools with no fruit arrangement (P = 0·040). No significant associations were found between the NSFS and the vegetable intakes of children and their parents. The study shows, using nationally representative data, that free school fruit is associated with increased child fruit intake and that it may also affect parental fruit intake.
Authors
Enjun Kuang Fengqin Chi Alhaji S. Jeng Qingrui Su Jiuming ZhangAbstract
No abstract has been registered
Authors
Derek Stewart Gordon McDougallAbstract
No abstract has been registered
Authors
Derek Stewart Anne Kennedy Anthony PavelAbstract
No abstract has been registered
Authors
Sebastian Mazur Arnfinn Nes Anne-Berit Wold Siv Fagertun Remberg Kjersti AabyAbstract
No abstract has been registered
Authors
Ragnhild Aabøe Inglingstad Håvard Steinshamn Binyam Sime Dagnachew Bernardo Valenti Andrea Criscione Elling-Olav Rukke Tove Gulbrandsen Devold Siv Borghild Skeie Gerd Elisabeth VegarudAbstract
No abstract has been registered
Authors
Lauri Rautkari Juhani Honkanen Callum Aidan Stephen Hill Daniel Ridley-Ellis Mark HughesAbstract
No abstract has been registered
Authors
Heleen de Wit Aksel Granhus Markus Lindholm Martin J. Kainz Yan Lin Hans Fredrik Veiteberg Braaten Joanna BlaszczakAbstract
Forest harvesting practices can potentially increase mercury run-off from catchments. A paired catchment experiment was conducted in a boreal forest in southern Norway, to test effects of forest harvest operations on (i) concentrations and fluxes of methylmercury (MeHg), total mercury (HgT), nutrients and dissolved organic matter (TOC), and on (ii) MeHg bioaccumulation in stream foodwebs. Thirty percent of a catchment was harvested in winter time with snow cover but no soil frost, resulting in wheel tracks and soil compaction. Pre-harvest differences included higher streamwater MeHg, HgT and TOC, and lower pH in the treated catchment compared to the reference. No significant treatment effects on concentrations of MeHg, HgT and TOC were detected, whereas concentrations of nutrients (ammonium, nitrate, phosphorus (P)) increased significantly. Estimated catchment export of nitrate and ammonium increased fourfold, as a combined effect of changed discharge and concentrations. Export of MeHg and HgT increased weakly, primarily because of an increase in discharge. Levels of MeHg in stream invertebrates mirrored differences in aquatic MeHg between the two streams, resulting in higher MeHg in biota in the harvest catchment in pre-harvest conditions. After harvest, MeHg levels in primary consumers (herbivorous stoneflies) were no longer different between the two streams, despite continued exposure to higher aqueous MeHg in the harvested catchment. Simultaneously, dietary biomarkers (δ15N signature, lipid- and algal fatty acid content) in the stoneflies had changed significantly, consistent with higher nutrient loadings and associated higher diet availability in the harvested stream. The results of our experiment do not support that forest management has a strong impact on catchment MeHg production. Catchment disturbance through forest harvesting may decrease MeHg in aquatic biota, because of higher stream productivity and associated higher quality of dietary sources, at least in the short-term. Other studies on catchment MeHg production to disturbance have shown a range in responses, from strong to none. So far, no factor has emerged to explain such range in responses. Predictions of forest management effects on MeHg in streamwater and aquatic food webs are hampered by limited understanding of catchment controls on MeHg production.
Abstract
No abstract has been registered