Change search
Refine search result
3456789 251 - 300 of 478
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the 'Create feeds' function.
  • 251.
    Mogren, Anna
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Gericke, Niklas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    The role of school organization in ESD implementation2015Conference paper (Refereed)
  • 252.
    Mogren, Anna
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Gericke, Niklas
    Karlstad University, Faculty of Social and Life Sciences.
    Scherp, Hans-Åke
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Education for Sustainable Development (ESD), a matter of school organization2014Conference paper (Refereed)
  • 253.
    Mogren, Anna
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    Gericke, Niklas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    Scherp, Hans-Åke
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Educational Studies (from 2013).
    Whole school approaches to education for sustainable development: a model that links to school improvement2018In: Environmental Education Research, ISSN 1350-4622, E-ISSN 1469-5871, p. 1-24Article in journal (Refereed)
    Abstract [en]

    This study applies a model of school organisation developed by one of the authors to investigate school improvement processes leading to a whole school approach in Education for Sustainable Development (ESD) literature. The model is operationalized to a survey instrument and distributed to Swedish upper secondary teachers. The instrument provides empirical indications of teachers’ perceptions of their schools in terms of four major dimensions of an ESD whole school approach, the importance assigned to a holistic vision, routines and structures, professional knowledge creation, and practical pedagogical work. The aims of the study are to compare the teachers’ perception of their school organisation. We compare perceptions of teachers working in schools actively implementing ESD and teachers in comparable reference schools. Comparisons are also made between teachers from schools applying different strategies and quality approaches in implementing ESD. The results indicate that, relative to teachers in ordinary schools, those in ESD schools perceive their school organisations to have higher quality and coherence, with greater potential to support teaching and pedagogical work in practice. However, there is substantial variation in perceptions of teachers from different ESD schools. The model’s robustness is validated by coherence of earlier results in the same schools

  • 254.
    Moniruzzaman, Syed
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Divergent trends in emergency department visits for poisonings by intent in Varmland, Sweden2016In: Injury Prevention, ISSN 1353-8047, E-ISSN 1475-5785, Vol. 22, p. A227-A227Article in journal (Other academic)
  • 255.
    Moniruzzaman, Syed
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    SELMA - Research for a healthier future2008Conference paper (Refereed)
  • 256.
    Moniruzzaman, Syed
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Eriksson, Ulla-Britt
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Health Sciences.
    Janson, Staffan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Health Sciences.
    Perceptions and perspectives of child maltreatment in Bangladesh: a pilot study2016In: Injury Prevention, ISSN 1353-8047, E-ISSN 1475-5785, Vol. 22, p. A160-A160Article in journal (Other academic)
  • 257.
    Moniruzzaman, Syed
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Nilson, Finn
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Public Safety.
    Svensson, Eva
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Via Spatiosa: Festschrift to Ragnar Andersson on his 67th birthday2014Report (Other academic)
    Abstract [en]

    Risk management is a comparatively new, and most definitely complex, research field, combining knowledge from several other disciplines such as medicine, engineering, economics and psychology, to name a few. Consequently, risk management is important in a variety of subjects and disciplines, clearly illustrated in this festschrift. Professor Ragnar Andersson has played an important roll in not only promoting the importance of risk management and injury prevention, but also developing a deeper understanding of the field through always actively choosing a broad, multi-disciplinary perspective. In other words, he has always chosen “via spatiosa”. Or in Swedish, “den breda vägen”

  • 258. Moora, Mari
    et al.
    Opik, Maarja
    Davison, John
    Jairus, Teele
    Vasar, Martti
    Zobel, Martin
    Eckstein, R. Lutz
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    AM fungal communities inhabiting the roots of submerged aquatic plant Lobelia dortmanna are diverse and include a high proportion of novel taxa2016In: Mycorrhiza, ISSN 0940-6360, E-ISSN 1432-1890, Vol. 26, no 7, p. 735-745Article in journal (Refereed)
    Abstract [en]

    While the arbuscular mycorrhizal (AM) symbiosis is known to be widespread in terrestrial ecosystems, there is growing evidence that aquatic plants also form the symbiosis. It has been suggested that symbiosis with AM fungi may represent an important adaptation for isoA << tid plants growing on nutrient-poor sediments in oligotrophic lakes. In this study, we address AM fungal root colonization intensity, richness and community composition (based on small subunit (SSU) ribosomal RNA (rRNA) gene sequencing) in five populations of the isoA << tid plant species Lobelia dortmanna inhabiting oligotrophic lakes in Southern Sweden. We found that the roots of L. dortmanna hosted rich AM fungal communities and about 15 % of the detected molecular taxa were previously unrecorded. AM fungal root colonization intensity and taxon richness varied along an environmental gradient, being higher in oligotrophic and lower in mesotrophic lakes. The overall phylogenetic structure of this aquatic fungal community differed from that described in terrestrial systems: The roots of L. dortmanna hosted more Archaeosporaceae and fewer Glomeraceae taxa than would be expected based on global data from terrestrial AM fungal communities.

  • 259.
    Naslund, Joacim
    et al.
    University Gothenburg, Sweden.
    Rosengren, Malin
    University Gothenburg, Sweden.
    Del Villar, Diego
    Technical University Denmark, Denmark.
    Gansel, Lars
    SINTEF Fisheries & Aquaculture, Trondheim, Norway.
    Norrgard, Johnny R.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Persson, Lo
    Swedish University Agricultuaral Sciences, Sweden.
    Winkowski, John James
    Canada.
    Kvingedal, Eli
    Norway.
    Hatchery tank enrichment affects cortisol levels and shelter-seeking in Atlantic salmon (Salmo salar)2013In: Canadian Journal of Fisheries and Aquatic Sciences, ISSN 0706-652X, E-ISSN 1205-7533, Vol. 70, no 4, p. 585-590Article in journal (Refereed)
    Abstract [en]

    Stocking programs using hatchery-reared salmon are often implemented for augmenting natural populations. However, survival of these fish is often low compared with wild conspecifics, possibly because of genetic, physiological, and behavioural deficiencies. Here, we compared presmolt Atlantic salmon (Salmo salar) from three different environmental treatments (barren environment, plastic tube enrichment, and plastic shredding enrichment) with regard to plasma cortisol levels, shelter-seeking behaviour, and fin deterioration. Basal plasma cortisol levels were higher in barren-reared fish, indicating higher stress levels, while no differences were found in acute cortisol response after a 30 min confinement test. Shelter-seeking was higher in salmon reared in enriched tanks when tested alone, but not when tested in small groups. Barren-reared fish had higher levels of fin deterioration over winter, potentially owing to higher aggression levels. These results suggest that enrichment can reduce the impact of stressors experienced in the hatchery and thus increase fish welfare. Tank enrichment may also be used to produce salmon better adapted for the more complex environment encountered after release.

  • 260.
    Nilson, Finn
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Fall-Related Injuries Amongst Elderly in Sweden: Still an Emerging Risk?2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In Sweden, injuries due to falls are the most common cause of injury-related hospitalization and injury-related death amongst elderly. Also, during the 20th century, increasing trends in fall-related injuries have been observed in many high-income countries. Whilst fall-related injury trends have been reported from national studies in other comparable countries, no studies from Sweden using national data have been published, despite this issue sometimes being pointed out as one of the most important emerging societal risks both in Sweden and elsewhere. With large individual and societal costs, as well as prognosticated continued increases in high-income countries, the aim of this thesis is to update the knowledge on the trends of fall-related injuries amongst elderly in Sweden and to determine whether the issue is still to be considered an emerging risk.

    National injury morbidity and mortality data from Sweden can show that with regards to all hospitalized fall-related injuries as well as hip fractures, the risk is decreasing. However, diverging trends are observed in age- and sex-specific groups, with younger elderly now having considerably lower rates of fall-related injuries, whilst older elderly are increasingly hospitalized due to minor fall-related injuries. Also, amongst older elderly, increasing hip fracture mortality trends are observed. With regards to sex-specific groups, although fall-related injuries in general are more common amongst women, the injury trends for women are generally decreasing at a quicker rate than for men. Also, contradictorily to almost all fall-related injury morbidity, hip fracture mortality risk is higher amongst men.

    This thesis can show a change in trend in fall-related injuries amongst elderly in Sweden since the turn of the century, apart from amongst older elderly and with regards to hip fracture mortality. The implications on prognoses needs to be studied further as do the underlying causes behind this shift in trend.

  • 261.
    Nilson, Finn
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Trends in hip fracture incidence rates among elderly in Sweden 1987-20092012Conference paper (Refereed)
  • 262.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Public Safety. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bonander, Carl
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Public Safety. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Andersson, Ragnar
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Public Safety. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    The effect of the transition from the ninth to the tenth revision of the International Classification of Diseases on external cause registration of injury morbidity in Sweden2015In: Injury Prevention, ISSN 1353-8047, E-ISSN 1475-5785, Vol. 21, no 3, p. 189-94Article in journal (Refereed)
    Abstract [en]

    Background Revisions of the International Classification of Diseases (ICD) have previously been shown to cause dramatic effects with regard to injury mortality data when implemented. However, limited knowledge exists on the effects on the coding of external causes of injury morbidity, despite this being an important aspect with regard to injury prevention.

    Method Hospitalised injuries in Sweden were studied using time series intervention analysis to observe the effect of the ICD change from ICD-9 to ICD-10 in 1997 on external cause coding.

    Results The results would suggest considerable coding issues with a large spike in the proportion of injury admissions registered without an external cause code in 1997, with continuing, although gradually diminishing, problems up to 2002. The coding change seems to have had an immediate effect on all external cause of injury categories, although the categories that were not directly convertible from ICD-9 to ICD-10 were seemingly more greatly affected.

    Discussion The study illustrates the potential issues associated with changes between ICD revisions and the importance of data quality control both during surveillance and collection of data, but also when presenting injury trends across ICD versions.

  • 263.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bonander, Carl
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Jonsson, Anders
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Differences in determinants amongst individuals reporting residential fires in Sweden – results from a cross-sectional study 2015In: Fire technology, ISSN 0015-2684, E-ISSN 1572-8099, Fire Technology, Vol. 51, no 3, p. 615-626Article in journal (Refereed)
  • 264.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bonander, Carl
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Jonsson, Anders
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Differences in determinants amongst individuals reporting residential fires in sweden-: results from a cross-sectional study2016In: Injury Prevention, ISSN 1353-8047, E-ISSN 1475-5785, Vol. 22, p. A40-A40Article in journal (Other academic)
  • 265.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013). Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Public Safety (from 2013).
    Börjesson, Mats
    Göteborgs universitet.
    Mortality in long-distance running races in Sweden - 2007–20162018In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 4, article id e0195626Article in journal (Refereed)
    Abstract [en]

    Background During the last decade, an increasing popularity of marathons has been seen. Although running has been shown to have considerable positive health effects, the risk of sudden death, most often due to sudden cardiac arrests, is also a risk runners expose themselves to. Whilst there are some studies on the mortality amongst long-distance runners, much of the evidence is dated. Given the increased popularity in running during the 21st century as well as the improvements in medical care at marathons, more knowledge is required on the mortality risk. Materials and method Publicly available racing and news databases were used to identify the number of entrants and finishers in half to full marathons in Sweden between 2007 and 2016 and the number of deaths that occurred in conjunction with the races. Results A total of 1,156,271 runners entered a long distance (21-42km) running race in Sweden between 2007 and 2016, and 834,412 runners finished the races (72.2%). A large majority of the finishers (677,050 (81%)) competed in distances under a full marathon. Two deaths occurred during the time period, meaning that the death rate was 0.24 (95% confidence interval 0.04–0.79) per 100,000 finishers. Conclusions This study can show that death rates in long distance running races between 2007 and 2016 in Sweden are very low, compared to previous studies. When added to the existing literature, the combined picture suggests a general downward trend in the risk of death during marathons since the 1980s. 

  • 266.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Gustavsson, Johanna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bonander, Carl
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Andersson, Ragnar
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Increasing hip fracture mortality amongst elderly in Sweden - a new emerging risk?Article in journal (Refereed)
  • 267.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Moniruzzaman, Syed
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Andersson, Ragnar
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    A comparison of hip fracture incidence rates among elderly in Sweden by latitude and sunlight exposure2014In: Scandinavian Journal of Public Health, ISSN 1403-4948, E-ISSN 1651-1905, Vol. 42, no 2, p. 201-206Article in journal (Refereed)
  • 268.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Moniruzzaman, Syed
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Andersson, Ragnar
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Fall-related fracture trends among elderly in Sweden – exploring transitions among hospitalized cases2013In: Journal of Safety Research, ISSN 0022-4375, E-ISSN 1879-1247, no 45, p. 141-145Article in journal (Refereed)
    Abstract [en]

    Problem

    Fall-related injuries have been a cause of worry during the end of the 20th century with increasing trends among the elderly.

    Method

    Using data from the Swedish National Patient Register (NPR) based on hospital admissions, this study explores the trends in fall-related fractures between 1998 and 2010.

    Results

    The data shows a decreasing trend in fall-related fractures in all age- and sex-specific groups apart from men 80 years and above. While hip fracture incidence rates decreased in all age- and sex-specific groups, both central fractures and upper extremity fractures have increased in all age- and sex-specific groups apart from women 65–79 years. Lower extremity fractures have increased in the older age groups and decreased in the younger. Discussion: The differences found between the groups of fractures and by age- and sex-specific groups indicate a possible transition where more serious fractures are decreasing while less serious fractures increase among hospitalized cases.

    Summary

    Perhaps due to a focus on hip fracture prevention, this study shows that while the incidence rate of hospitalized hip fractures has decreased, other fall-related hospitalized fractures have increased.

    Impact on industry

    Potentially, this could be indicative of a healthier younger elderly, coupled with a frailer older elderly requiring more comprehensive healthcare also for less serious injuries. Further research is needed to confirm our results.

  • 269.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Moniruzzaman, Syed
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Andersson, Ragnar
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Hospitalized fall-related injury trends in Sweden between 2001 and 20102016In: International Journal of Injury Control and Safety Promotion, ISSN 1745-7300, E-ISSN 1745-7319, Vol. 23, no 3, p. 277-283Article in journal (Refereed)
    Abstract [en]

    Previous studies have indicated increasing trends of hospitalized fall-related injuries amongst elderly. Whether this is true also in Sweden is unknown though it is important to study considering the potential societal impact. Data were obtained regarding hospitalized injuries with falls as external cause among those aged 65 years and above with information on injury type, gender and age, on a yearly basis, from 2001 to 2010. Age- and sex-specific incidence rates were calculated (per 100,000 population) for all fall-related injuries, and for each injury type and trend lines were drawn. Linear regression analyses and percentage change were calculated for the types of fall-related injuries. A decreasing incidence was observed in the younger age groups (65-79 years) with greater decreases amongst women (women: -14.6%, men 65-79 years: -10.5%). However, increasing rates were observed in the older age group (80 years and above), with greater increases amongst men (women: 4.3%, men: 11.4%). Superficial injuries showed greater increases than fractures amongst those aged 80 years and above. This study indicates that older elderly in Sweden are increasingly being hospitalized for less serious injuries. This changing injury panorama is important to include in the future planning of both health care and fall-related prevention.

  • 270.
    Nilson, Finn
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Moniruzzaman, Syed
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Gustavsson, Johanna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Andersson, Ragnar
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Trends in hip fracture incidence rates among elderly in Sweden 1987-20092013In: Journal of Public Health, ISSN 1741-3842, E-ISSN 1741-3850, Vol. 35, no 1, p. 125-131Article in journal (Refereed)
    Abstract [en]

    Background Previous trend studies have shown large increases in hip fracture incidence rates among the elderly. International research, however, suggests a levelling off, or decline, of hip fracture incidence rates, although for Sweden this remains to be studied.

    Methods Data were obtained regarding hip fractures among individuals 65 years and above from 1987 to 2009. Analysis was performed in three steps. First, age- and sex-specific trends in hip fracture rates per 100 000 and the mean age when sustaining a hip fracture were analysed. Secondly, the annual percentage change was used to compare time periods that helped to quantify changes in secular trends. Finally, linear and Poisson regression models were used to examine the trend data and observed rates.

    Results The absolute number of hip fractures among the elderly in Sweden has largely remained constant between 1987 and 2009, while incidence rates have decreased for all age- and sex-specific groups, with the largest changes in the younger age groups and among women. The mean age of sustaining a hip fracture has increased for both men and women.

    Conclusions This study supports other international studies in showing a decrease in hip fracture incidence rates among the elderly, especially since the mid-1990s.

  • 271.
    Nilsson, Adrian
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    En jämförelse av mängden död ved i kalhygge och produktionsskog2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Woody debris is an important part in many ecosystems and has several different functions. Many species depend on the existence of woody debris, where it is used for example as a food source, nesting site, growing site or as a refuge. In clearcut areas, where the natural production of woody debris no longer exists, it is therefore important that a certain amount of woody debris is left behind to make sure that the area continues to have good biological function? In this investigation, I compared clearcut areas with production forest to see if there was a difference in the volume of woody debris. Five sites with 70–100-year-old spruce- and pine forests were inventoried. Every site consisted of one clearcut area that was adjacent to an area with production forest. No difference in volume of woody debris was found between the areas. The inventory showed that many of the measured trunk diameters that were found in the clearcut areas were around 10 centimeters, whereas in the areas with production forest the diameter varied more. Larger volumes of woody debris were found in spruce forests then in pine forests. Thus,the conclusion is that clearcutting an area with production forest does not seem to have a big impact on the volume of woody debris. Nevertheless, the measured amounts of woody debris are far less then what are found in natural forests, which indicates management needs to see what improvements can be done to increase the amount of woody debris in many of our forests.    

  • 272.
    Nilsson, Anders
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Roach partial migration: predation, personality and propensity2015Conference paper (Other academic)
    Abstract [en]

    Migration may confer benefits, such as foraging opportunity and predator avoidance, but partial migration, i.e. that not the whole population migrates, can be expected if benefits differ between individual phenotypes. We here show that seasonal migration from lakes to connected streams in the freshwater fish roach is strongly affected by risk of cormorant predation. We show that the duration away from the lake, as well as roach individual body size, influence the probability of being predated by cormorants. We also present novel field data showing that cormorant predation acts as a selective pressure against individuals with bold personality, providing a mechanism behind the evolution and maintenance of behavioural phenotypic diversity along the bold-shy continuum. Accordingly, we argue that bold individuals have a higher migratory propensity to avoid cormorants, and that cormorant predation on bold individuals may shift animal-personality composition of roach populations, with consequences for selective processes and lake system composition and function.

  • 273.
    Nilsson, Jessica
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Fjärranalys av skogsskador efter stormen Gudrun: Skogens återhämtning efter den värsta stormen i modern tid2017Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    On January 8th, 2005 one of the most devastating storms in Sweden’s history occurred, where hundreds of thousands became powerless and seven people lost their lives. The storm Gudrun hit central Götaland worst and nearly nine years’ professional felling of forests was estimated to have fallen in some areas. Previous studies of the storm were carried out on behalf of the Swedish Forest Agency, where the results show that the proportion of windthrown forest area was 11 % in the worst affected municipality of Ljungby. About 80 % of all damaged forests were spruce, 18 % were pine and 2 % were deciduous.                       

    The aim of this thesis is to investigate the amount of windthrown forest after the storm Gudrun through analysis of satellite remote sensing data. The proportion of windthrown coniferous and deciduous forest was calculated and the results were compared to the reports written on behalf of the Swedish Forest Agency. Furthermore, the proportion of reforested areas in 2016 was calculated. A change analysis based on satellite data from Landsat 5 from 2004 and 2005 was performed which included a forest mask created by supervised MLC classification. The forest mask was used to exclude uninteresting areas in the analyses. The result was then used for the analysis of the proportion of windthrown coniferous and deciduous forest and for the analysis of reforested areas in 2016. In the latter, a forest mask based on Landsat 8 data was used.

    The results from the analyses show that about 15.8 % of the forest was windthrown, of which 78 % were coniferous and 13 % were deciduous forest. By 2016, 25% of the windthrown areas had been reforested. The accuracy of the results is generally high, but despite this, it substantially differs from the results of earlier studies. The reason for this could be differences in satellite images and programs and additional error sources in conjunction with the analyses.

  • 274.
    Nilsson, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Mathematical models for compressible flow in porous media2014In: Proceedings of the 19th International Drying Symposium / [ed] Julien Andrieu, Roman Peczalski, Séverine Vessot, 2014Conference paper (Refereed)
    Abstract [en]

    Mechanical dewateringcan be accomplished by applying vacuum on one side of the material. In suchapplications, the air flow accompanying dewatering can be substantial and energy-efficient operation requires accurate design and control of the vacuum system. The present study analyses one-dimensional, compressible flow through porous media.Three types of flow are investigated: isothermal, isentropic and adiabatic. The results are presented in terms of relations between dimensionless numbers. The main result is that the difference between assumptions of adiabatic andisothermal flow will be quite small for the majority of foreseeable process conditions.

  • 275.
    Nilsson, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Stepwise Development of a Mathematical Model for Air Flow in Vacuum Dewatering of Paper2014In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 32, no 13, p. 1587-1597Article in journal (Refereed)
  • 276.
    Nilsson, Per Anders
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013). Lunds universitet.
    Hulthén, Kaj
    Lunds universitet.
    Chapman, Ben
    University of Nottingham & University of Manchester, UK.
    Hansson, Lars-Anders
    Lunds universitet.
    Brodersen, Jakob
    Department of Fish Ecology and Evolution, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Center for Ecology, Evolution and Biogeochemistry, Kastanienbaum, Switzerland.
    Baktoft, Henrik
    Technical University of Denmark, Denmark.
    Vinterstare, Jerker
    Lunds universitet.
    Brönmark, Christer
    Lunds universitet.
    Skov, Christian
    Technical University of Denmark, Denmark.
    Species integrity enhanced by a predation cost to hybrids in the wild2017In: Biology Letters, ISSN 1744-9561, E-ISSN 1744-957X, Vol. 13, no 7, p. 1-4, article id 20170208Article in journal (Refereed)
    Abstract [en]

    Species integrity can be challenged, and even eroded, if closely related species can hybridize and produce fertile offspring of comparable fitness to that of par- ental species. The maintenance of newly diverged or closely related species therefore hinges on the establishment and effectiveness of pre- and/or post- zygotic reproductive barriers. Ecological selection, including predation, is often presumed to contribute to reduced hybrid fitness, but field evidence for a predation cost to hybridization remains elusive. Here we provide proof-of- concept for predation on hybrids being a postzygotic barrier to gene flow in the wild. Cyprinid fishes commonly produce fertile, viable hybrid offspring and therefore make excellent study organisms to investigate ecological costs to hybrids. We electronically tagged two freshwater cyprinid fish species (roach Rutilus rutilus and bream Abramis brama) and their hybrids in 2005. Tagged fish were returned to their lake of origin, exposing them to natural predation risk from apex avian predators (great cormorant, Phalacrocorax carbo). Scanning for regurgitated tags under cormorant roosts 3–4 years later ident- ified cormorant-killed individual fish and allowed us to directly test for a predation cost to hybrids in the wild. Hybrid individuals were found significantly more susceptible to cormorant predation than individuals from either parental species. Such ecological selection against hybrids contributes to species integrity, and can enhance species diversification.

  • 277.
    Nord, Madelene
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Metabolism och personlighetstyp hos svartmunnad smörbult (Neogobuis melanostomus)2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Previous studies have shown that there is a strong correlation between the body mass of an organism, activity level and metabolism (metabolic rate, MR) where a higher body mass and activity level correlate with a higher MR. How is it then with an organism's personality and its MR; does the type of personality of the organism play a part in its MR? To test the prediction that a more active personality, such as boldness, would show a higher value of MR in comparison to a more inactive personality, such as shyness, personality, standard metabolic rate (SMR), maximum metabolic rate (MMR) and aerobic scope (MMR-SMR) were compared for the invasive fish species round goby (Neogobius melanostomus) sampled from Guldborgsund in the Western Baltic. In total, about 400 round goby were captured, of which 19 individuals underwent the entire study. Personality was assessed by two different experiments, scototaxis and boldness, where the individuals then were divided into the personality groups bold and shy. SMR, MMR and aerobic scope were analyzed by respirometry.

    There was a significant difference in SMR between the two types of personality (bold and shy), which also has been found in previous studies (Toscano & Monacos, 2015). There were no significant differences between either MMR, aerobic scope or weight between bold and shy fish. In conclusion, the significant difference in SMR between bold and shy fishes, was probably based on the fact that individuals with a higher proportion of boldness had a higher energy consumption to compensate for the phenotypic benefits (such as higher and easier dispersibility) compared to individuals with less boldness. However, further studies on round goby would have to be performed to investigate whether there is a connection between boldness and a higher dispersibility.

  • 278.
    Nordquist, Sandra
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Blankålens (Anguilla anguilla) val av flyktväg vid passage av ett småskaligt vattenkraftverk2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The European eel is an endangered species that migrates between the ocean and fresh water or brackish water during its life cycle. The eels that migrate to lakes and streams encounter obstacles, such as hydroelectric plants (HEP), which prevent the eels from moving freely between the ocean and streams. The construction of passages at the HEPs is one way to help the eel when migrating back to the ocean. The purpose of this study was to examine whether eels prefer to pass the HEP at the water surface or at the bottom during its downstream migration. The study was performed at the HEP in Alster, at the River Alsterälven, east of Karlstad. The flexibility of the eels when searching for a passage was also examined to determine if they will use the passage that is available at the moment, or if they wait until their first choice of route is available. The pipes, which led to traps that were emptied every day during September and October 2012, yielded 126 fishes out of which 112 were eels. In order to examine whether the eels are flexible or not the pipes were open either one at a time or both at the same time according to a random block design. The results showed that 63% of the eels preferred the pipe located at the water surface, and that the eels were not flexible in terms of depth preference when searching for a passage. The eel preferred the pipe at the water surface regardless of whether it had access surface pipes or pipes at both depths at the same time.

  • 279. Noren, Viveca
    et al.
    Hedelin, Beatrice
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Nyberg, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bishop, Kevin
    Flood risk assessment: Practices in flood prone Swedish municipalities2016In: International Journal of Disaster Risk Reduction, E-ISSN 2212-4209, Vol. 18, p. 206-217Article in journal (Refereed)
    Abstract [en]

    Risk assessments are important to ensure efficient and effective flood risk management. Methods and strategies for flood risk assessment are described in the literature, but less is known about how assessments are actually performed. We have studied local flood risk assessments in Sweden by interviewing flood risk managers in municipalities and analyzing documentation of flood risk assessment efforts. There is a large variation between municipalities in how flood risk assessment has been done. The efforts made in association with the EU Floods Directive together with a Government Commission about a flood in Lake Malaren are the most advanced assessments. Only a few of the municipalities have done comparable assessments. Generally, however, there is a lack of experience and theoretical knowledge about concepts and methods of flood risk assessment in the municipalities. In the assessments studied, the flood itself had been rather well defined in hazard maps. The consequences of a flood had been studied in the larger projects but only by half of the municipalities. It is mainly direct, tangible consequences that have been included. It is mainly the exposure of assets that has been investigated while little attention has been paid to vulnerability. To improve flood risk assessment in Sweden there is a need for knowledge and resources in the municipalities. Prioritization and motivation are needed to actually perform the assessments. National guidelines for may be helpful to guide municipalities in this work and to have more uniform risk assessment. (C) 2016 Elsevier Ltd. All rights reserved.

  • 280.
    Norrgård, Johnny R
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Migration and quality of landlocked Atlantic salmon smolt: Implications for conservation and management2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Atlantic salmon Salmo salar has a complex life cycle, including long migrations and habitat shifts for both juveniles and adults. As such, salmon populations are vulnerable to habitat degradation and fragmentation along their migratory routes. This makes management and conservation a complex task requiring knowledge of salmon ecology at different temporal and spatial scales. In this thesis I highlight the use of a holistic life-history based approach in the conservation and management of wild and hatchery-reared salmon in regulated rivers and lakes.

    Small populations of wild-reproducing landlocked salmon and trout Salmo trutta exist in the regulated River Klarälven, Sweden. Since the 1930s, transportation of adult spawners upstream of eight dams has given the fish access to spawning grounds. The number of returning wild spawners became critically low in the 1960s, but stocking of hatchery smolts resulted in an increase in spawners that continues today. My data show that wild smolt may suffer high mortality due to multiple dam passages. To ensure viable populations of wild populations, future management should include both up- and downstream solutions that ensure connectivity in the system.

    The recreational and commercial salmonid fishery are maintained by compensatory stockings, yielding annual catches of about 75 tons, and a river return rate of hatchery fish of about 1%. As a large portion of the stocked smolts does not survive downstream migration to the lake, there has been discussion about the quality of the stocked smolt and about stocking strategies. Based on my studies, producing hatchery smolts more closely resembling wild-born conspecifics should result in reduced loss rates. I suggest changes in the hatchery and stocking procedures to increase the survival of stocked smolts. The results of my research should be applicable to other regulated systems, particularly those with mixed stocks of wild and hatchery salmonid populations.

  • 281.
    Norrgård, Johnny R
    et al.
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Bergman, Eva
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Greenberg, Larry
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Schmitz, Monika
    Department of Organism Biology, Comparative Physiology, Uppsala University.
    Effects of feed quality and quantity on growth, early maturation and smolt development in hatchery-reared landlocked Atlantic salmon Salmo salar2014In: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649, Vol. 85, no 4, p. 1192-1210Article in journal (Refereed)
    Abstract [en]

    The effects of feed quality and quantity on growth, early male parr maturation and development of smolt characteristics were studied in hatchery reared landlocked Atlantic salmon Salmo salar. A 2x2 factorial design was used, with two levels of feed rations and lipid content of the feed. The fish were reared from first feeding until release in May the second year. At the end of the experiment salmon fed high rations, regardless of lipid content, grew the most, whereas salmon fed low lipid feed with low rations grew the least. In addition, fish fed low lipid feed had lower body lipid levels than fish fed high lipid feed. Fish from all treatments showed some reduction in condition factor (CF) and lipid levels during their second spring. Smolt status was evaluated using both physiological and morphological variables. These results, based on Na+, K+-ATPase (NKA) enzyme activity, saltwater tolerance challenges and visual assessments, were consistent with each other, showing that salmon from all treatments except the treatment in which fish were fed low rations with low lipid content, exhibited characteristics associated with smolting at two-years of age. Smolting was mainly affected by feed rations; fish fed higher rations experienced enhanced smolting. Sexually mature male parr from the high ration, high lipid content treatment were also subjected to saltwater challenge tests, and were found to be unable to regulate plasma sodium levels. Low feed rations noticeably reduced the proportion of sexually mature male parr, while there was no difference related to lipid content of feed. Fish fed low rations with low lipid content exhibited the highest degree of severe fin erosion.

  • 282.
    Norén, Viveca
    et al.
    Uppsala University, Sweden.
    Hedelin, Beatrice
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bishop, Kevin
    Swedish University of Agricultural Sciences, Sweden.
    Drinking water risk assessment in practice: the case of Swedish drinking water producers at risk from floods2016In: Environment Systems and Decisions, ISSN 2194-5403, E-ISSN 2194-5411, Vol. 36, no 3, p. 239-252Article in journal (Refereed)
    Abstract [en]

    To achieve a safe and reliable drinking water supply, water producers need to manage a large range of risks regarding both water quality and quantity. A risk management approach where risks are systematically identified and handled in a preventive manner is promoted by the World Health Organization and supported by researchers and drinking water experts worldwide. Risk assessment is an important part of such a management approach, and a variety of tools for risk assessment are described in the literature. There is, however, little knowledge of how drinking water risk assessment is performed in practice, including which tools that are actually used. This study investigates the use of risk assessment tools, and the approach to risk management, on a local level in the Swedish water sector. It is based on interviews with key persons from a targeted selection of water producers. We find that the application of tools as well as the approach to risk assessment and management differs considerably between the water producers. The tools most frequently used are mainly the ones promoted or required by Swedish national organizations. Although many of the water producers have done some kind of risk assessment, most have not implemented a risk management approach. Furthermore, their knowledge of the concepts of risk and risk management is often limited. The largest challenge identified is to prioritize risk assessment, so that it is actually performed and then used as a basis for managing risk in a systematic way.

  • 283.
    Nylin, Soren
    et al.
    Stockholms universitet.
    Österling, Martin
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    Janz, Niklas
    Stockholms univesitet.
    Embracing Colonizations: A New Paradigm for Species Association Dynamics2018In: Trends in Ecology & Evolution, ISSN 0169-5347, E-ISSN 1872-8383, Vol. 33, no 1, p. 4-14Article in journal (Refereed)
    Abstract [en]

    Parasitehost and insectplant research have divergent traditions despite the fact that most phytophagous insects live parasitically on their host plants. In parasitology it is a traditional assumption that parasites are typically highly specialized; cospeciation between parasites and hosts is a frequently expressed default expectation. Insectplant theory has been more concerned with host shifts than with cospeciation, and more with hierarchies among hosts than with extreme specialization. We suggest that the divergent assumptions in the respective fields have hidden a fundamental similarity with an important role for potential as well as actual hosts, and hence for host colonizations via ecological fitting. A common research program is proposed which better prepares us for the challenges from introduced species and global change.

  • 284.
    Nyqvist, Daniel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Atlantic salmon in regulated rivers: Migration, dam passage, and fish behavior2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Hydropower dams block migration routes and disrupt longitudinal connectivity in rivers, thereby posing a threat to migratory fish species. Various fish passage solutions have been implemented to improve connectivity with varying success. A well-functioning passage solution must ensure safe and timely passage routes that are used by a substantial portion of the migrating fish. In this thesis, I report the results from telemetry studies where the behavior and survival of migrating Atlantic salmon spawners, post-spawners and smolts have been evaluated in relation to hydropower dam passage. I evaluate downstream passage performance at dams with no passage solutions in the River Klarälven, and with simple passage solutions in in the Winooski River. In the River Ätran, I study both upstream- and downstream passage performance at a dam with sophisticated passage solutions based on the best available technology. In addition, I have studied the survival and behavior of post-spawners and hatchery-released smolts.

    A substantial portion of the spawners survived spawning and initiated downstream migration. Most males migrated downstream in autumn following spawning, whereas females tended to stay in the river until spring. For hatchery-reared smolts, early release was associated with faster initiation of migration and higher survival compared to late release. Multiple dam passage resulted in high mortality for both smolts and kelts. For smolts, dam passage, even with simple passage solutions, was associated with substantial delay and mortality. High spill levels were linked to high survival and short delay for downstream migrating salmon. The best available passage solution, which consisted of a nature-like fishway and a low sloping intake rack to guide fish to a bypass, resulted in rapid passage of a large portion of the adult migrants.

  • 285.
    Nyqvist, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bergman, Eva
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Calles, Olle
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Greenberg, Larry
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Intake Approach and Dam Passage by Downstream-migrating Atlantic Salmon Kelts2017In: Rivers Research and Applications: an international journal devoted to river research and management, ISSN 1535-1459, E-ISSN 1535-1467, Vol. 33, no 5, p. 697-706Article in journal (Refereed)
    Abstract [en]

    Studying fish behaviour at hydropower dams is needed to facilitate the design and improvement of fish passage solutions, but few studies have focused on Atlantic salmon kelts. Here, we used radio telemetry (n = 40, size range = 50–81 cm) and acoustic sonar to study kelt movements in the forebay as well as their dam passage survival and subsequent migration success past multiple dams. We also compare radio telemetry and acoustic sonar observations of fish behaviour and used acoustic sonar to measure the depth distribution of fish approaching the turbine intake zone. Passage success at the dam was 41%, and mortality was largely associated with turbine passage (62%). The two fish that passed via the spill gates survived and continued their downstream migration. At the dam, all but one radio-tagged kelt approached the intake zone shortly after arrival to the forebay, and sonar data showed that approaching fish were predominantly surface oriented (72%, 88% and 96% of the observations were less than 1, 2 and 3 m deep, respectively). Turbine passage rate from the intake zone was higher at night than at day, indicating that the lack of visual cues may reduce the barrier effect of the 70-mm conventional trash rack. Turbine passage rate also increased with increasing hydropower generation. The percentage of observed upstream movements away from the intake zone compared with the total number of observations was considerably greater in the radio telemetry data (41%) than in the sonar data (4%). Only one fish survived passage of all eight hydropower dams to reach the lake. This low-passage survival underscores the need for remedial measures to increase the survival of migrating kelts, and the fish's surface orientation as well as their rapid approach to the intake rack should be taken into account when designing such measures.

  • 286.
    Nyqvist, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Calles, Olle
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Bergman, Eva
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Hagelin, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Greenberg, Larry
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Post-Spawning Survival and Downstream Passage of Landlocked Atlantic Salmon (Salmo salar) in a Regulated River: Is There Potential for Repeat Spawning?2016In: Rivers Research and Applications: an international journal devoted to river research and management, ISSN 1535-1459, E-ISSN 1535-1467, Vol. 32, no 5, p. 1008-1017Article in journal (Refereed)
    Abstract [en]

    Repeat salmonid spawners may make large contributions to total recruitment and long term population stability. Despite their potential importance, relatively little is known about this phase of the life history for anadromous populations, and nothing has been reported for landlocked populations. Here, we studied post-spawning behaviour and survival of landlocked Atlantic salmon in relation to downstream dam passage in the River KlarÀlven, Sweden. Eight hydropower stations separate the feeding grounds in Lake VÀnern from the spawning grounds in the River KlarÀlven, and no measures to facilitate downstream migration are present in the river. Forty-nine percent of the salmon survived spawning and initiated downstream migration. Females and small fish had higher post-spawning survival than males and large fish. The post-spawners migrated downstream in autumn and spring and remained relatively inactive in the river during winter. Downstream migration speed in the free flowing part of the river was highly variable with a median of 9.30km/day. Most fish passed the first hydropower station via upward-opening spill gates after a median residence time in the forebay of 25min. However, no tagged fish survived passage of all eight hydropower stations to reach Lake VÀnern. This result underscores the need for remedial measures to increase the survival of downstream migrating kelts.

  • 287.
    Nyqvist, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Greenberg, Larry
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Calles, Olle
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Goerig, Elsa
    nst Natl Rech Sci, Ctr Eau Terre & Environm, Quebec City, PQ, Canada.
    Bergman, Eva
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Ardren, William
    S Fish & Wildlife Serv, Western New England Complex, Essex Jct, VT USA.
    Castro-Santos, Theodore
    USGS Leetown Sci Ctr, SO Conte Anadromous Fish Res Ctr, Turners Falls, MA USA.
    Migratory delay leads to reduced passage success of Atlantic salmon smolts at a hydroelectric dam2017In: Ecology of Freshwater Fish, ISSN 0906-6691, E-ISSN 1600-0633, Vol. 26, no 4, p. 707-718Article in journal (Refereed)
    Abstract [en]

    Passage of fish through hydropower dams is associated with mortality, delay, increased energy expenditure and migratory failure for migrating fish and the need for remedial measures for both upstream and downstream migration is widely recognised. A functional fish passage must ensure safe and timely passage routes that a substantial portion of migrating fish will use. Passage solutions must address not only the number or percentage of fish that successfully pass a barrier, but also the time it takes to pass. Here, we used radiotelemetry to study the functionality of a fish bypass for downstream-migrating wild-caught and hatchery-released Atlantic salmon smolts. We used time-to-event analysis to model the influence of fish characteristics and environmental variables on the rates of a series of events associated with dam passage. Among the modelled events were approach rate to the bypass entry zone, retention rates in both the forebay and the entry zone and passage rates. Despite repeated attempts, only 65% of the tagged fish present in the forebay passed the dam. Fish passed via the bypass (33%), via spill (18%) and via turbines (15%). Discharge was positively related to approach, passage and retention rates. We did not detect any differences between wild and hatchery fish. Even though individual fish visited the forebay and the entry zone on multiple occasions, most fish passed during the first exposures to these zones. This study underscores the importance of timeliness to passage success and the usefulness of time-to-event analysis for understanding factors governing passage performance.

  • 288.
    Nyqvist, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    McCormick, S. D.
    S.O. Conte Anadromous Fish Research Center USGS-Leetown Science Center.
    Greenberg, Larry
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Ardren, W. R.
    U.S. Fish and Wildlife Service.
    Bergman, Eva
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Calles, Olle
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Castro-Santos, Theodore
    2 S.O. Conte Anadromous Fish Research Center USGS-Leetown Science Center.
    Downstream migration and multiple dam passage by Atlantic salmon smolts2017In: North American Journal of Fisheries Management, ISSN 0275-5947, E-ISSN 1548-8675, Vol. 4, no 37Article in journal (Refereed)
    Abstract [en]

    The purpose of this study was to investigate behavior and survival of radio-tagged wild and hatchery-reared landlocked Atlantic Salmon Salmo salar smolts as they migrated past three hydropower dams equipped with fish bypass solutions in the Winooski River, Vermont. Among hatchery-reared smolts, those released early were more likely to initiate migration and did so after less delay than those released late. Once migration was initiated, however, the late-released hatchery smolts migrated at greater speeds. Throughout the river system, hatchery-reared fish performed similarly to wild fish. Dam passage rates varied between the three dams and was highest at the dam where unusually high spill levels occurred throughout the study period. Of the 50 fish that did migrate downstream, only 10% managed to reach the lake. Migration success was low despite the presence of bypass solutions, underscoring the need for evaluations of remedial measures; simply constructing a fishway is not synonymous with providing fish passage.

  • 289.
    Nyqvist, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Nilsson, Anders
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences. Lunds universitet.
    Alenäs, I
    Falkenberg Energi.
    Elghagen, J
    Falkenberg Energi.
    Hebrand, M
    Fiskevårdsteknik AB.
    Karlsson, S
    SLU.
    Kläppe, S
    Fiskevårdsteknik AB.
    Calles, Olle
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Upstream and downstream passage of migrating adult Atlantic salmon: Remedial measures improve passage performance at a hydropower dam2017In: Ecological Engineering: The Journal of Ecotechnology, ISSN 0925-8574, E-ISSN 1872-6992, Vol. 102, p. 331-343Article in journal (Refereed)
  • 290.
    Nyqvist, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Nilsson, P. Anders
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences. Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden.
    Alenäs, I.
    Cristiansson, Jonas
    Hedbrant, M.
    Karlssson, S.
    Kläppe, S.
    Calles, Olle
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Two-way hydropower dam passage of migrating adult Atlantic salmonManuscript (preprint) (Other academic)
  • 291.
    Obregón, C.
    et al.
    Estuaries & Wetlands Conservation Programmes, Conservation Programmes Department, Zoological Society of London, Regents Park, London.
    Lyndon, A. R.
    Centre for Marine Biodiversity and Biotechnology, Institute of Life and Earth Sciences, Heriot-Watt University, John Muir Building, Edinburgh, United Kingdom.
    Barker, J.
    Estuaries & Wetlands Conservation Programmes, Conservation Programmes Department, Zoological Society of London, Regents Park, London, United Kingdo.
    Christiansen, H.
    Laboratory of Biodiversity and Evolutionary Genomics, Department of Biology, KU Leuven.
    Godley, B. J.
    Centre for Ecology and Conservation, Daphne du Maurier Building, College of Life and Environmental Sciences, Department of Biosciences, University of Exeter,.
    Kurland, S.
    Populations genetics, Department of Zoology, Stockholm University, Stockholm.
    Piccolo, John
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    Potts, R.
    Biosciences, College of Life and Environmental Sciences, Department of Biosciences, University of Exeter.
    Short, R.
    Department of Life Sciences, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot, United Kingdom.
    Tebb, A.
    Sussex Inshore Fisheries and Conservation Authority, Shoreham-by-Sea, West Sussex, United Kingdom.
    Mariani, S.
    School of Environment and Life Sciences, University of Salford, Peel Building, Salford, United Kingdom.
    Valuing and understanding fish populations in the Anthropocene: Key questions to address2018In: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649, Vol. 92, no 3, p. 828-845Article in journal (Refereed)
    Abstract [en]

    Research on the values of fish populations and fisheries has primarily focused on bio-economic aspects; a more nuanced and multidimensional perspective is mostly neglected. Although a range of social aspects is increasingly being considered in fisheries research, there is still no clear understanding as to how to include these additional values within management policies nor is there a cogent appreciation of the major knowledge gaps that should be tackled by future research. This paper results from a workshop held during the 50th anniversary symposium of the Fisheries Society of the British Isles at the University of Exeter, UK, in July 2017. Here, we aim to highlight the current knowledge gaps on the values of fish populations and fisheries thus directing future research. To this end, we present eight questions that are deeply relevant to understanding the values of fish populations and fisheries. These can be applied to all habitats and fisheries, including freshwater, estuarine and marine.

  • 292.
    Ogla, Ali
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Halter av bekämpningsmedel i rå- och dricksvatten i Sverige2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Undesirable effects from pesticides have been noted not only in Sweden but also all over the world where chemical agents are used without any restriction. Raw water is a raw material for drinking water. In Sweden raw water originates from both surface and groundwater; results of water surveys in Sweden have shown that different pesticides are present both in raw and drinking water. This study presents the concentrations of pesticides in raw and drinking water in Sweden and the study has shown that there are significant differences in the proportions of samples with pesticides between raw and drinking water. The results also show that the highest proportion of samples with pesticide residues in drinking water (30.43%) was registered in the County of Blekinge. The highest proportion of samples with pesticide residues in raw water (42.30%) was registered in the County of Gävleborg. For surface and groundwater, the results show that at least one pesticide (active substance) has been found in all samples in surface and groundwater in Sweden in 2015. 

    Some prohibited substances were found in groundwater even though they were banned more than 20 years ago. Prohibited substances were also detected in water operations.          

    Most of pesticides in Sweden are used by industry; herbicides are mainly used in agriculture while households use mostly moss pesticides.

    The study shows that there are high concentrations of pesticides in raw water in Sweden.  Some prohibited substances were detected in surface water, groundwater and water operations.

     

  • 293.
    Olofsson, Angélica
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    ”See something, say something”: - En kvalitativ undersökning om arenaansvarigas arbete kring säkerhetsinteraktion med besökare.2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Historical events have shown the potential danger and the serious and sometimes tragic consequences that can occur at arenas and places where large crowds are gathered. There are several challenges when communicating safety to a broad audience whose focus lays on the event and its adventures.

    The purpose of this study is to examine how managers at arenas operate and interact around the safety of visitors in an arena. A total of six qualitative interviews with eight people who work with arenas was done and thematically analysed.

    The results of the study show that safety and security are on top of the priority list of both the arenas and organizers. The organisation’s size and thus resources affects the conditions for work and therefore the approach can differ. Although there is a clear division of responsibilities in terms of laws and regulations most arenas consider themselves as a form of controller on certain fundamental aspects of safety. Collaboration between stakeholders and government has evolved during the last years and is considered to be good.

    There are several challenges since risk perception is subjective, and also because each event is unique. Planning and analysis is therefore crucial, taking into account the nature of the event, expected audience, potential threats and local conditions. Social media has opened up new possibilities related to information and dialogue but also new risks since uncontrolled information can spread rapidly. Exchange of experience between the arenas appears to mainly be done informally, although research has shown that by learning from own and others' mistakes, new mistakes can be avoided and potential impacts milder. The result shows that there is a movement towards a more proactive safety approach and that safety and service are key factors. The future will hold a shared responsibility - “see something, say something”.

  • 294.
    Olsson, Daniel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Sustainability Consciousness Questionnaire - categorization of items2017Data set
  • 295.
    Olsson, Daniel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Sustainability Consciousness Questionnaire - grade six version2017Data set
  • 296.
    Olsson, Daniel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Sustainability Consciousness Questionnaire - grade twelve version2017Data set
  • 297.
    Olsson, Daniel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Sutstainability Consciousness Questionnaire - grade nine version2017Data set
  • 298.
    Olsson, Daniel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Young People's "Sustainability Consciousness": Effects of ESD Implementation in Swedish Schools2014Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The UN Decade of Education for Sustainable Development is approaching its end and it is important to investigate the effects of the efforts to implement education for sustainable development (ESD) nationally, before decisions on forthcoming efforts are made. There are few investigations of the effect of ESD implementation that take a broad approach. In order to measure the educational effects of ESD implementation broadly and inclusively, I introduce the concept of sustainability consciousness (SC), which will be operationalized into the research through a Likert scale questionnaire. This licentiate thesis contributes new knowledge on the implementation of ESD in the Swedish school system as reflected in young people’s SC. Two studies have been conducted. In the first study, I investigated the effects of ESD implementation by a comparison of SC between students in schools with an explicit ESD approach and control schools without an explicit approach. In the second study, I investigated whether the perceptual dip among adolescents found in the field of environmental education was also present in the economic and social dimensions of their SC in addition to the environmental one. The total sample included 2 413 students in 6th, 9th and 12th grades of the Swedish schools system. Results of the two studies indicate that the implementation of ESD in the Swedish compulsory school system does not seem to have been particularly successful as there are only small positive effects of an explicit ESD approach in 6th grade and even a small negative effect of an explicit ESD approach in the 9th grade. Furthermore, the dip in adolescent 9th graders’ SC is confirmed. This indicates that different age groups tackle the effects of the prevailing traditional sustainability teaching in different ways, which suggests that ESD in schools need to be adapted to different levels.

  • 299.
    Olsson, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Gericke, Niklas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Adolescents and the dip in sustainability consciousness2015Conference paper (Refereed)
    Abstract [en]

    Previous research has shown that interest in and concern about environmental issues tends to decline in adolescence, in this paper referred to as a “dip”. However, less is known whether adolescents’ interests and concerns for sustainable development (SD), i.e. a more inclusive concept including economic and social issues, also dip in adolescence. Education for sustainable development (ESD) could be regarded as a teaching approach that in a good way meets the educational needs of adolescents. Therefore before promoting widespread adoption of such an approach it is important to rigorously test the hypothesis whether adolescents’ broader consciousness of SD really dip.  A research group in Sweden has recently developed an instrument for surveying students’ sustainability consciousness (SC), a broad concept integrating affective and cognitive aspects of the three dimensions of SD. Thus, this study aims to investigate students’ SC in the transition to adolescence. This was done by surveying 2413 Swedish students in the 6th, 9th and 12th grade using an age-adapted questionnaire. The results unambiguously show that Swedish students’ SC dips in adolescence, strongly indicating a need to modify the sustainability education of adolescents. Education for Sustainable Development is recommended as an approach to meet that need. However, further research is needed to evaluate the potential utility of ESD as a teaching approach for tackling the adolescent dip in students’ SC.

  • 300.
    Olsson, Daniel
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Gericke, Niklas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Eco-Schools in Sweden and the Effects on Students’ Sustainability  Consciousness. Oral presentation within the symposia: “Evaluation of the Effectiveness of Eco-school Programs – Different Approaches”, including the participants: Vinterek, M., Sund, P., Rauch, F., Varga, A., Saly, E., Konczey, R., Borg, F., Winberg, M., Olsson, D. & Gericke, N.2016Conference paper (Refereed)
3456789 251 - 300 of 478
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf