| 1. |
- Ahrné, Karin, et al.
(author)
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Tillstånd och trender för arter och deras livsmiljöer – rödlistade arter i Sverige 2015
- 2015
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Reports (other academic/artistic)abstract
- 2015 års upplaga av den svenska rödlistan är den fjärde i ordningen. Den är baserad på IUCN:s rödlistningskriterier och revideras vart femte år. I rödlistan bedöms risken som enskilda arter av djur, växter och svampar löper att försvinna från Sverige. Bedömningen utförs av ArtDatabankens medarbetare i samverkan med över 100 externa experter, indelade i 14 expertkommittéer för olika organismgrupper. Under arbetet med 2015 års rödlista har tillstånd och trender bedömts för 21 600 arter och 1 318 lägre taxa (apomiktiska arter, underarter och varieteter), sammanlagt ca 22 900 taxa. Av de bedömda arterna klassificerades 2 029 som hotade (kategorierna CR, EN och VU) och 4 273 som rödlistade (inkluderar även kategorierna NT, RE och DD). Förhållandet mellan antalet rödlistade och antalet bedömda arter ar 19,8 %, vilket är ungefär samma värde som 2010 och 2005. I denna rapport jämförs antalet och andelen rödlistade arter mellan olika organismgrupper, biotoper, substrat och påverkansfaktorer. Texten ar indelad i en allmän del och åtta kapitel inriktade på olika landskapstyper. Landskapstyperna utgör en grov indelning av landets miljöer enligt följande kategorier: Skog, Jordbrukslandskap, Urbana miljöer, Fjäll, Våtmarker, Sötvatten, Havsstränder och Havsmiljöer. Skogen och jordbrukslandskapet är de artrikaste landskapstyperna med 1 800 respektive 1 400 arter som har en stark anknytning dit, och ytterligare flera hundra arter som förekommer där mer sporadiskt. De faktorer som påverkar flest rödlistade arter i Sverige är skogsavverkning och igenväxning, som båda utgör ett hot mot vardera ca 30 % av de rödlistade arterna. Avverkning minskar arealen av skog där naturliga strukturer och naturlig dynamik upprätthålls, och den orsakar därmed förlust av livsmiljöer. Igenväxning orsakas av ett antal faktorer, bland annat upphörande hävd (bete och slåtter), gödsling, trädplantering och brist på naturliga störningsregimer som t.ex. regelbundna översvämningar kring vattendrag och sjöar. Andra viktiga påverkansfaktorer är fiske, torrläggning av våtmarker, tillbakagång hos värdarter (främst alm och ask som drabbats av invasiva svampsjukdomar), klimatförändringar och konkurrens från invasiva arter. IUCN:s rödlisteindex beräknas för ett urval av de bedömda organismgrupperna. Rödlisteindex visar att skillnaderna mellan rödlistorna från 2000, 2005, 2010 och 2015 är små. Ett par undantag finns dock. Groddjur och stora däggdjur har fått en något förbättrad situation sedan 2000. Totalt förefaller det ändå som att trycket mot Sveriges artstock har förblivit relativt konstant under de senaste 15 åren.
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| 2. |
- Morf, Andrea, 1968, et al.
(author)
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The Road Towards Koster Sea National Park - Potentials and Challenges of Implementing Ecosystem Based and Participatory Maritime Management
- 2011
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Reports (other academic/artistic)abstract
- This report provides results from a comprehensive analysis of the process leading towards Koster Sea national park, Sweden’s first marine national park. International pressure for participatory and ecosystem based management of marine resources is increasing (e.g. Convention of Biodiversity or EU’s Integrated Maritime Policy, Marine Strategy Directive, and ICZM-recommendations). Introducing integrative, participatory management of marine resources to a centralist, sector-based system of governance as in Sweden presents challenges. Various management experiments are under way. An interesting one combines protection and sustainable use in Sweden’s most valuable marine cold-water habitats: Koster Sea national park was inaugurated 2009 in parallel to the Norwegian park Ytre Hvaler and covers a large part of the archipelago and territorial waters in the municipalities of Tanum and Strömstad. The park makes an example for innovative marine management. The road towards it has been long and curvy. In the wake of proposals and protests, a process of community development with an integrative sustainability perspective has developed through an intensive dialogue between authorities and local stakeholders. After 30 years of recurring clashes locals and authorities agree that ecological and cultural values can be protected and used at the same time – under the condition that these uses are designed to be long-term sustainable, and evaluated and developed further in collaboration. Top-down management has met bottom-up initiative. Conservation is no more seen as a dead end by the users but as providing potential for rural development with sustainable tourism. The park’s goals include conservation, education, and sustainable use. Locals are not merely tolerated but an important part in the park's co-management structure – the steering committee Koster Sea Delegation and its working groups. Many participants are interested in analysing this process, which they call the ”Koster Sea Dialogue” in order to learn from it. The participation-process has been documented by the project “The Road Towards Koster Sea National Park”, financed by the Swedish Environmental Protection Agency. The study focused on the process, its drivers, the institutional framework, participation, stakeholders’ roles and networks, and conflict management. Methods include semi-structured interviews, observation and document analysis. An important process characteristic has been the long-term, active involvement of those living and working in the area. Local perspectives and knowledge have reached authorities to a larger extent than usual, making solutions adapted to local circumstances. Another characteristic is a linking of fisheries and local socio-economic development with conservation. The use of a rural development perspective, an evolving collaboration over years and active individuals at many levels have been important too. Researchers at the local marine research station have been important knowledge bearers and defenders of conservation but also translators and mediators in clashes between conservation and use. Other, more “usual” factors have been political interest, time, and resources. However, delegating the responsibility for a participation process to locals and letting it develop ad-hoc has its challenges. In rural areas it is important to proceed with care. Here, individuals are a main driving force – on leisure time. It cannot be expected from all to have the skills and resources for process leadership. People depend on each other and may be reluctant to confront neighbors. Conflicts easily become destructive if escalated. Locally based, ad-hoc process management allows for adaptation to local needs but is less transparent for outsiders. Continuous collaboration over years builds trust among those involved. On the flip side, an insider-elite with access to knowledge but little time to work with outreach may unintentionally be excluding others. Even if delegated to local forces, such processes require authorities’ back up with financial and other resources. The planning is concluded; implementation has just begun. Assessing the process from an adaptive co-management and ecosystem approach perspective – using criteria such as integration along various dimensions, adaptation and learning, participation, and a sustainable development perspective integrating ecological limits with socio-economic needs – the process and its institutional arrangements score relatively high. Some things need to be developed further: • A larger scale marine planning perspective including uses and environment in the surroundings. • The management system with working groups and the roles of the Delegation. • An more structured communication and participation planning and readiness for conflict management. • Monitoring effects in all three dimensions of sustainable development: ecological, social, economic. • Developing structures for organizational learning.
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| 3. |
- Baumann, Henrikke, 1964, et al.
(author)
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One, two, three, many! or…? Mapping of the controversy over the Swedish West Coast shrimp
- 2016
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In: 22nd International Sustainable Development Research Society Conference.
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Conference paper (peer-reviewed)abstract
- 'Controversy mapping' can provide insights about issues related to actors, their networking, and governance where the interpretation of science is at stake. In turn, these insights can be useful for advocacy processes and collective problem-solving. In order to illustrate this statement a case study was conducted for the North Sea prawn (Pandalus borealis) in the West Coast of Sweden which was the main subject of a controversy that started in 2014 and ended in October 2015 with a Marine Stewardship Council labeling for the contested prawn. We used a method from the scientific humanities, 'controversy mapping', following the methodology suggested by Venturini (2010) and Latour (2012). The method enabled us to trace statements, literatures, and actors involved in the shrimp controversy. By assembling these elements over time, we were able to describe the process of the controversy and identify the networks that 'wrestled' over the scientific interpretation of the (same) data on shrimp population size along the Swedish West Coast. By using network visualisation and analysis software, the case study shows the extension of the network of actors that were part of the controversy, their roles, influence, perspectives and relationships. The material gathered on the controversy was subsequently analysed from the perspective of the production and consumption system of the shrimp. It shows how advocacy actors build alliances with selected product chain actors in order to gather momentum for change. Based on the findings from this research it is possible to suggest that controversy study can help the product chain actors understand their production and consumption system better and provide a basis for product chain roundtables for conflict resolution and problem solving. Latour, Bruno. “Mapping controversies: syllabus 2012 -13.” MediaLab. Science Po. Retrieved from www.medialab-dev.sciences-po.fr October 15, 2015. Venturini, Tommaso. “Diving in magma: How to explore controversies with actor-network theory.” Public understanding of science 19.3 (2010): 258-273
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| 4. |
- Otero, Juana Camacho, 1979, et al.
(author)
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Unravelling the shrimp nets.
- 2016
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Reports (other academic/artistic)abstract
- 'Controversy mapping' can provide insights about issues related to actors, their networking, and governance where the interpretation of science is at stake. In turn, these insights can be useful for advocacy processes, collective problem-solving and decision-making. In order to explore the potential of controversy mapping, a case study was conducted for the North prawn (Pandalus borealis), which was the main subject of a controversy that started in 2014 on the West Coast of Sweden. A temporary stabilization in the controversy was reached in May 2016 when WWF endorsed the Marine Stewardship Council labeling for the also red-listed and red-lighted prawn. We used ‘controversy mapping’ from the scientific humanities, following the methodology suggested by Venturini (2010) and Latour (2012). The method allows to tracing of statements, literatures, and actors involved in a controversy. By assembling these elements, we described the process of the controversy and identify the networks that 'wrestled' over the scientific interpretation of the (same) data on population size for the Swedish West coast shrimp. Using network visualisation and analysis softwares, we map the extent of the actor networks in the controversy, and analyse the roles and influence of different actors. The material gathered was subsequently analysed through a life cycle lens in order to see how the controversy played out in the shrimp’s product chain organization. This shows advocacy actors seeking to enrol the consumption system in order to protect the shrimp, resulting in many reactions from production system actors. Based on the findings, we discuss implications for life cycle thinking and life cycle management of product chains. Among else, we suggest that controversy study can help product chain actors better understand their production and consumption system. This, in turn, may support shared conflict resolution and problem-solving, for example, in product chain roundtables.Latour, Bruno. “Mapping controversies: syllabus 2012 -13.” MediaLab. Science Po. Retrieved from www.medialab-dev.sciences-po.fr October 15, 2015.Venturini, Tommaso. “Diving in magma: How to explore controversies with actor-network theory.” Public understanding of science 19.3 (2010): 258-273
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| 5. |
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| 6. |
- Eriksson, Max, et al.
(author)
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Viltvårdsavgiften : En studie av svenskarnas vilja att betala det statliga jaktkortet
- 2018
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Reports (other academic/artistic)abstract
- Viltvårdsavgiften ska enligt Jaktförordningen (SFS 1987:905, 49 §) betalas av alla över 18 år som jagar i Sverige. Avgiften är 300 kr och gäller för ett jaktår, vilket omfattar tiden 1 juli–30 juni. Det statliga jaktkortet är ett kvitto på att denna avgift är betald. Under de senaste decennierna har antalet personer som löser det statliga jaktkortet minskat. I den här rapporten, som är ett utredningsuppdrag från Naturvårdsverket till Sveriges lantbruksuniversitet (SLU), undersöks varför antalet personer som löser jaktkort minskar, och om antalet jaktkortslösare som ägnar sig åt jakt också minskat över tid. Rapporten omfattar endast personer bosatta i Sverige.
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| 7. |
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| 8. |
- Sandström, Alfred, et al.
(author)
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Fisk- och skaldjursbestånd i hav och sötvatten 2018 : Resursöversikt
- 2019
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Reports (other academic/artistic)abstract
- Den 14:e utgåvan av den samlade resursöversikten av fisk- och kräftdjursbeståndens status i våra vatten.I rapporten kan du ta del av bedömningen som görs av situationen för bestånd som regleras inom ramen för EU:s gemensamma fiskeripolitik (GFP). Bedömningarna baseras på det forskningssamarbete och den rådgivning som sker inom det Internationella Havsforskningsrådet (ICES).De bestånd som förvaltas nationellt baseras på de biologiska underlagen, och rådgivningen i huvudsak på den forskning och övervakning samt analys som bedrivs av Institutionen för akvatiska resurser vid Sveriges lantbruksuniversitet (SLU Aqua) samt yrkesfiskets rapportering.Rapporten omfattar 41 fiskarter och åtta skaldjursarter.Nytt för i år är att flodkräftan och signalkräftan har fått egna presentationer. Vi har även ett nytt kapitel "Hållbarhetsbedömning av fisk- och skaldjursbestånd i havsområden runt Sverige”. Det består av en sammanfattning av den årliga bedömningen av hållbarheten i nyttjandet av fisk- och skaldjursbestånd i kust och hav runt Sverige. Bedömningenär baserad på de senaste tre åren vilket möjliggör en jämförelse över tid iantalet hållbart nyttjade bestånd. Jämförelsen visar inga tydliga förändringar över de senaste tre åren.Det finns ett nytt avsnitt i kapitlet ”Från biologi till förvaltning” om hur Havs- och vattenmyndighetens tillståndsgivning går till, och hur bedömningen baseras på resursöversikten vid ansökan om fiskelicens eller annan tillståndsgivning. Kapitlet har också utökats med ett avsnitt där SCB:s fritidsfiskeundersökning beskrivs och hur resultatet används i beståndsanalyserna.
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| 9. |
- Hansson, Sture, et al.
(author)
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Competition for the fish - fish extraction from the Baltic Sea by humans, aquatic mammals, and birds
- 2018
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In: ICES Journal of Marine Science. - : Oxford University Press (OUP). - 1054-3139 .- 1095-9289. ; 75:3, s. 999-1008
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Journal article (peer-reviewed)abstract
- Seals and fish-eating birds have increased in the Baltic Sea and there is concern that they compete with fisheries. Using data from around year 2010, we compare consumption of different fish species by seals and birds to the catch in the commercial and recreational fishery. When applicable this is done at the geographical resolution of ICES subdivisions. Predation by birds and mammals likely has limited impact on the populations of the commercially most important species (herring, sprat, and cod). In the central and southern Baltic, seals and birds consume about as much flatfish as is caught by the fishery and competition is possible. Birds and seals consume 2-3 times as much coastal fish as is caught in the fishery. Many of these species are important to the fishery (e. g. perch and whitefish) and competition between wildlife and the fishery is likely, at least locally. Estimated wildlife consumption of pike, sea trout and pikeperch varies among ICES subdivisions and the degree of competition for these species may differ among areas. Competition between wildlife and fisheries need to be addressed in basic ecosystem research, management and conservation. This requires improved quantitative data on wildlife diets, abundances and fish production.
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| 10. |
- Sundblad, Eva-Lotta, 1956, et al.
(author)
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Social analysis: A marine societal analysis. A report prepared for Sweden’s initial assessment as required by the Marine Environmental Ordinance (SFS 2010:1341) : Social analys – en havsrelaterad samhällsanalys. Underlagsrapport för Sveriges inledande bedömning i havsmiljöförordningen.
- 2012
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Reports (other academic/artistic)abstract
- The Marine Environmental Ordinance (SFS 2010:1341) is part of a strategy to bring about ecosystem-based management and sustainable use of the marine environment in accordance with the EU’s the Marine Strategy Framework Directive (MSFD, 2008/56/EC). The ordinance is intended to maintain or achieve good environmental status in the marine environment. Under the Marine Environmental Ordinance, the Swedish Agency for Marine and Water Management (SwAM) must ensure that an initial assessment is carried out on the marine environment in the Swedish waters of the two regions, the North Sea and the Baltic Sea (Articles 13–16). The initial assessment, which is to be completed by 15 July 2012 and reported to the European Commission not later than 15 October of the same year, is to provide a basis for the establishment of good environmental status, environmental targets and environmental monitoring programmes, as well as the preparing of programmes of measures by which established targets may be achieved. The initial assessment will include conducting an economic and social analysis. The former can be divided into two parts, the first of which is designed to analyse the use of the marine region and the second to describe the cost of the degradation of the marine environment (Marine Environmental Ordinance, Article 13, para. 4, and the Marine Strategy Framework Directive, Article 8.1c). The primary purpose of the social analysis in the initial assessment is to create a picture of the underlying conditions of the upcoming work to achieve the aims of the directive, that is, good environmental status (GES, Article 9). The analysis is also intended to provide basic information for the establishment of environmental targets (Article 10) that will subsequently form the foundation of programmes of measures and administrative funding (Article 13). The assessment includes an analysis of how different groups in society can be affected by how the sea is used and by marine environmental problems and measures taken to address them. This study presents a method by which such an analysis can be conducted. The method includes a conceptual model that consists of the components 'Indirect driving forces, 'Direct driving forces , 'Environmental pressures, state and impact', 'Impact on society', and 'Response'. The model is used in combination with a question template to analyse actors, activities and driving forces. Case studies involving three environmental problems – selective overfishing of cod and the unwanted dispersion of mercury and phosphorous – show that a large number of actors are involved, directly and indirectly. In addition, these actors operate on several levels –local/regional, national and international. Every environmental problem requires its own analysis and has its own set of conditions. The study shows that the information needed for making decisions regarding the measures that should be taken is relatively extensive. The determination of the amount of information necessary and therefore how much should be systematically collected in future can have a great impact on the development of society and the environment. Finally, suggestions are given as to how future social analyses relating to the marine environment might be carried out.
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| 11. |
- Eriksson, Louise, 1973-, et al.
(author)
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The importance of structural, situational, and psychological factors for involving hunters in the adaptive flyway management of geese
- 2023
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In: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 13:1
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Journal article (peer-reviewed)abstract
- Adaptive flyway management of superabundant geese is emerging as a strategy to reduce damage to agricultural crops and other ecosystem disservices, while also ensuring sustainable use and conservation objectives. Given the calls for intensified hunting as part of flyway management in Europe, we need to increase the understanding of structural, situational, and psychological factors important for goose hunting among hunters. Our survey data, retrieved in southern Sweden, showed a higher potential to intensify hunting among goose hunters than other hunters. In response to hypothetical policy instruments (including regulations, collaborative, and others), hunters declared a minor increase in their intention to hunt geese, with the greatest expected increase among goose hunters should the hunting season be extended. Situational factors (e.g., access to hunting grounds) were associated with goose hunting (frequency, bag size, and intention to increase hunting). In addition, controlled motivation (derived from external pressures or to avoid guilt) and more importantly autonomous motivation (due to hunting being enjoyable or valuable) were along with goose hunter identity positively associated with goose hunting. Hunters’ involvement in flyway management may be encouraged by using policy instruments to remove situational barriers and facilitate their autonomous motivation.
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| 12. |
- Andersson, Magnus, et al.
(author)
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Fiskbestånd och miljö i hav och sötvatten : Resurs- och miljööversikt 2012
- 2012
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Reports (other academic/artistic)abstract
- Detta är den nionde utgåvan av den samlade översikten över fisk- och kräftdjursbeståndens status i våra vatten. Kunskap om fiskbestånden och miljön är en förutsättning för att utnyttjandet av fiskresurserna skall bli bärkraftigt. För svenska vattenområden beskrivs miljöutvecklingen i ett ekosystemsperspektiv, dels för att tydliggöra fiskens ekologiska roll och beskriva yttre miljöfaktorer som påverkar fiskbestånden, dels för att belysa fiskets effekter på miljön.Fiskbestånd och miljö i hav och sötvatten är utarbetad av Sveriges lantbruksuniversitet (SLU), Institutionen för akvatiska resurser (SLU Aqua), på uppdrag av Havs- och vattenmyndigheten. Rapporten sammanfattar utveckling och beståndsstatus för de kommersiellt viktigaste fisk- och kräftdjursarterna i våra vatten. Bedömningar och förvaltningsråd är baserade på Internationella Havsforskningsrådets (ICES) rådgivning, SLU Aquas nationella och regionala provfiskedata, samt yrkesfiskets rapportering.
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| 13. |
- Öhrman, Phillip, et al.
(author)
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En studie om tillit till inventeringssystemet för stora rovdjur
- 2019
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Reports (other academic/artistic)abstract
- Tillit, att lita på samhället och på sina medmänniskor, är samhällets kitt. Ett samhälle, inklusive dess olika komponenter, som präglas av hög tillit antas fungera bättre än om tilliten är låg. Syftet med vår studie är att utvärdera tilliten till inventeringssystemet för stora rovdjur bland de myndigheter och intresseorganisationer som är direkt berörda av systemet. På basis av intervjuer utvärderade vi tilliten genom sex olika delkomponenter; kommunikation,ansvars- och kompetensfördelning, resurser, respekt, kunskap och rättvisa. Vi har identifierat brister i alla sex delkomponenterna vilket sammantaget resulterar i att tilliten för systemet kan betecknas som låg. • Kommunikationen i systemet; hur kommunikationen sker, vad somkommuniceras, och på vilket sätt beslut kommuniceras upplevs som undermålig.• Ansvars- och kompetensfördelningen upplevs som otydlig. Det finns en klyfta mellan de som fastställer regler och riktlinjer och de som utför inventeringarna, varför relationerna präglas mer av kontroll och misstro än av handlingsutrymme och tillit.• Inventeringsresurserna räcker inte till eller prioriteras fel; t.ex. prioriteras varg på bekostnad av de övriga arterna. Det minskar förutsättningarna att fatta välgrundade beslut om ersättningar för rovdjurspredation ochom licens- och skyddsjakt.• Respekten för kunskap, näringsverksamhet och ideellt arbete upplevs som bristfällig. Respekten missgynnas också av den rigida kontrollkultur som upplevs ha utvecklats till följd av mål- och resultatstyrning i kombination med strikta inventeringskriterier.• Integrationen av ny kunskap är bristfällig. Bristen på ett systematiskt s.k. adaptivt lärande leder till att nya lösningar inte tillämpas eller utvecklas i tillräckligt hög grad.• Systemet upplevs som orättvist och slutet. En översyn av hur kostnader och nytta fördelas efterlyses av aktörerna, både vad gäller direkta kostnader,men även transaktionskostnader, dvs. kostnader förknippade med samråd och samverkan. Det är också oklart hur aktörerna aktivt tillåts delta i utvecklingen av systemet. Aktörerna lyfter fram en rad förslag till hur tilliten kan stärkas. Det utgör grunden till förbättringar som också kan accepteras av de flesta:• Inled ett systematiskt kvalitetssäkringsarbete med fokus på dialog och aktörssamverkan, till exempel inom ramen för Dialog för Naturvård.• Arbeta gemensamt fram en tydlig rollfördelning som beskriver vem som gör vad, när och varför inom hela inventeringskedjan, med syftet att öka förutsägbarheten för alla inblandade.• Skapa incitament och strukturer för adaptiv förvaltning inom hela inventeringskedjan,på alla nivåer.• Ta fram en översyn av hur kostnader och nytta fördelas för alla aktörer.Det ska inkludera direkta kostnader och transaktionskostnader, dvs. kostnader förknippade med samråd och samverkan.• Utveckla och effektivisera inventeringsmetoderna, gärna med ny teknik som DNA, kameror och drönare. Utöka samarbetet med forskningsprojekt som till exempel ScandCam.• Återkoppla direkt till intresseorganisationernas och allmänhetens observationerför att öka motivationen att rapportera.• Utveckla ett regelverk för de år där det saknas inventeringsdata (t.ex.på grund av snöbrist), genom till exempel en rutin för framskrivning av antalet djur baserat på trendanalys.• Minska fjärrstyrningen, NVs roll bör vara mer koordinerande än kontrollerande.• Verka för kunskapsintegration (s.k. kollektiv intelligens) genom att samordnakunskaper, vetenskaplig samt lokal och traditionell kunskap, så att det gagnar hela systemet.• Gör en översyn av hur resurser fördelas och prioriteras i systemet.
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| 14. |
- Mulokozi, Deogratias Pius, et al.
(author)
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An ecological and economical assessment of integrated amaranth (Amaranthus hybridus) and Nile tilapia (Oreochromis niloticus) farming in Dar es Salaam, Tanzania
- 2020
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In: Fishes. - : MDPI AG. - 2410-3888. ; 5:3
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Journal article (peer-reviewed)abstract
- Organic wastes can be recycled in an ecologically sound way in fishponds by applying integrated agriculture and aquaculture systems (IAA). This kind of waste recycling can help to protect the environment from pollution and improve fishpond yields. Additionally, IAA provides an opportunity for diversification of the output from two or more existing subsystems leading to higher overall farm economic returns. This study explored the potential application of amaranth wastes (AW) as a dietary ingredient for tilapia in a tilapia-amaranths integrated system (ITA). An experimental diet (AD) contained 10% (based on the control diet, CD) inclusion of AW collected from a nearby vegetable market. The experiments included triplicate treatments with; (i) fish fed on AD, where the pond water was used for irrigating the amaranth plants (IAA-fish), and (ii) fish fed on CD, where no pond water was used for irrigating the amaranth plants (non-IAA fish). 90 days after fish stocking, eighteen 4 m2 amaranth plots were prepared and treated with (i) tap water without fertilization (control amaranths), (ii) water from IAA-fish pond and organically fertilized (IAA amaranths), and (iii) tap water and inorganically fertilized (non-IAA amaranths). The use of AW improved the fish feed conversion ratio. The overall net income from ITA was 3.2, 2.3, 2.6, and 1.8 higher than from non-IAA amaranths, IAA-amaranths, non-IAA fish, and IAA fish sub-systems respectively.
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| 15. |
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| 16. |
- Johansson, Maria, et al.
(author)
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Appraisals of Wildlife During Restorative Opportunities in Local Natural Settings
- 2021
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In: Frontiers in Environmental Science. - : Frontiers Media SA. - 2296-665X. ; 9
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Journal article (peer-reviewed)abstract
- Many call for a broad approach to valuation of nature’s contribution to people, one that provides a contextualized understanding of what may be experienced as a value in different cultures, groups and settings. In the present paper we address contributions of nature to psychological well-being as realized through restorative processes during encounters with wildlife. Although restorative benefits of nature experience have received much consideration, sparse attention has been given to the role of the presence or absence of different animals in the settings investigated. The presence of a liked species may increase appreciation for and engagement with a natural setting, but fear of encountering some species may counter the desire to visit a setting with otherwise high restorative quality. This paper proposes a psychological framework for understanding how wildlife may contribute to or hinder people’s opportunities to restore in local natural settings. The framework addresses the transaction between the individual and their surroundings, making use of an appraisal theory of emotion and theories about the restorative benefits of nature experience. We focus upon encounters in landscapes shared by humans and wildlife, and we elaborate on our reasoning with scenarios from Sweden involving local people’s appraisal of wolves and roe deer. An integrated understanding of the psychological processes at work would facilitate communication and decision-making about the contribution of wildlife in nature conservation and management.
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| 17. |
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| 18. |
- Whitlock, Rebecca
(author)
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Informing Management of Atlantic Bluefin Tuna Using Telemetry Data
- 2022
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In: Frontiers in marine science. - : Frontiers Media SA. - 2296-7745. ; 9
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Journal article (peer-reviewed)abstract
- Sustainable management of exploited marine fish and wildlife populations requires knowledge about their productivity. Survival from natural causes of mortality is a key component of population productivity, but is notoriously difficult to estimate. We evaluate the potential for acoustic telemetry as a long-term monitoring tool to estimate rates of natural mortality. We present a Bayesian multistate mark-recapture model for telemetry data collected over a decade from 188 Atlantic bluefin tuna (Thunnus thynnus) and apply it to estimate the rate of natural mortality using only acoustic tag detections for all animals, or using acoustic tag detections for 96 single-tagged tuna plus acoustic tag detections combined with estimated positions from pop-up satellite archival tags for 92 double-tagged animals. We support the model for bluefin tuna with a simulation study to quantify bias in estimates of population dynamics parameters and investigate the effect of auxiliary information from satellite tagging on mortality rate estimates for different acoustic tag detection probability scenarios.We obtained posterior estimates of the instantaneous annual natural mortality (survival) rate across a decade of tagging for Atlantic bluefin tuna of 0.17 yr(-1) (0.84 yr(-1)) both using only acoustic tagging data, and using a combination of acoustic and satellite tagging data. Use of a prior implying a higher rate of fishing mortality yielded an instantaneous annual natural mortality (survival) estimate of 0.10 yr(-1) (0.90 yr(-1)), with combined acoustic and satellite tag data. Results from the simulation study indicate that the use of satellite tags can improve the precision and accuracy of estimates of detection probabilities, area-specific movement probabilities and mortality rates, where the extent of the improvement depends on true underlying acoustic tag detection probabilities. Our work demonstrates that long-term acoustic tagging data sets have strong potential for monitoring of highly migratory marine fish and wildlife populations, providing information on a number of key parameters, including survival and movement rates. However, improved information on tag reporting rates or fishing mortality is needed to better separate natural and fisheries mortality for Atlantic bluefin tuna.
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| 19. |
- Blomquist, Johan, et al.
(author)
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Do Firm Support Increase Investments? Evidence from the Aquaculture and Fish Processing Sectors in Sweden
- 2022
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In: Journal of Agricultural and Applied Economics. - : Cambridge University Press (CUP). - 1074-0708 .- 2056-7405. ; 54:2, s. 306-318
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Journal article (peer-reviewed)abstract
- The European Union provides firm support to the maritime sector to reach the policy objectives in the Common Fisheries Policy. This paper analyzes to what extent the investment support to aquaculture and fish processing firms in Sweden increases firm investment activity. By doing so, the paper also quantifies the amount of investments that would have been undertaken also without support (deadweight losses, DWL). The results show that the support increases investment in aquaculture with a factor of 0.65, thus with a DWL of 35%. The corresponding number for fish processing is a DWL of 77%.
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- Andersson, Magnus, et al.
(author)
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Short-term tagging mortality of Baltic cod (Gadus morhua)
- 2021
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In: Fisheries Research. - : Elsevier BV. - 0165-7836 .- 1872-6763. ; 234
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Journal article (peer-reviewed)abstract
- Tagging-induced mortality experiments are an important component of mark-recapture studies, as they can be used to assess the appropriateness of the tagging methodology, and to improve the reliability of estimates of recapture rates used for calculations of mortality rates and population size. Here, short-term tagging mortality of Baltic cod was estimated through containment experiments in the southern Baltic Sea. Experimental cod were selected from trawl catches, and approximately half were tagged externally with T-bar tags and received an intraperitoneal injection of tetracycline-hydrochloride. The rest of the experimental cod formed the control group, and received neither tag nor injection. The tagged and control cod were mixed evenly within submersible cages, and held for 5-8 days. The experiments were conducted in different regions and during different months by different tagging teams. Overall mortality rate was 16 % (n = 324), with the mortality rate of the tagged group 19 %, and the mortality rate of the control group 13 %. A general linear mixed model was fit to assess the effect of tagging, month, experiment duration, fish length and tagging site (i.e. the combined effect of region and tagging team) on mortality. Tagging had no effect on mortality, indicating that mortality can be attributed mainly to the capture and handling procedure. There was a significantly negative relationship between fish length (range: 20-55 cm) and mortality. Mortality did not differ between the months tested, but there was a significant effect of tagging site on mortality. Tagging-related mortality should be accounted for in analyses of data from mark-recapture studies of Baltic cod, and some variability in mortality between tagging sites can be expected.
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| 45. |
- Bergström, Roger, et al.
(author)
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Utbildning och forskning
- 2016
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In: <em>Jaktens historia i Sverige: Vilt – människa – samhälle – kultur</em>. - Stockholm : Liber Hermods. - 9789147112944 ; , s. 291-300
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Book chapter (other academic/artistic)
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| 47. |
- Sundelöf, Andreas, et al.
(author)
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Fisk- och skaldjursbestånd i hav och sötvatten 2021 : Resursöversikt
- 2022
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Reports (other academic/artistic)abstract
- I rapporten kan du ta del av bedömningen som görs av situationen för bestånd som regleras inom ramen för EU:s gemensamma fiskeripolitik (GFP). Bedömningarna baseras på det forskningssamarbete och den rådgivning som sker inom det Internationella Havsforskningsrådet (ICES). Sammantaget redovisas tillståndet för 107 bestånd av 48 fisk- och skaldjursarter.De bestånd som förvaltas nationellt baseras på de biologiska underlagen, och rådgivningen i huvudsak på den forskning och övervakning samt analys som bedrivs av Institutionen för akvatiska resurser vid Sveriges lantbruksuniversitet (SLU Aqua) samt yrkesfiskets rapportering.Rapporten är en beställning från Havs- och vattenmyndigheten (HaV) till Sveriges lantbruksuniversitet (SLU) och utgör ett viktigt kunskapsunderlag till myndighetens arbete. Den uppfyller de krav som finns inom EU:s gemensamma fiskeripolitik om att basera förvaltningen på bästa tillgängliga vetenskap. Denna rapport är också ett stöd till det arbete som beskrivs närmare i strategin för framtidens fiske och tillhörande handlingsplaner för vattenbruk, yrkes- och fritidsfiske som HaV och Jordbruksverket har tagit fram i dialog med fiskets och vattenbrukets intressenter.
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| 48. |
- Elofsson, Katarina, et al.
(author)
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Optimal management of two ecologically interacting deer speciesreality matters, beliefs don't
- 2017
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In: Natural Resource Modeling. - : John Wiley & Sons. - 0890-8575 .- 1939-7445. ; 30:4
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Journal article (peer-reviewed)abstract
- The aim of this paper is to analyze the optimal management of two ecologically interdependent, competing species, roe deer (Capreolus capreolus) and fallow deer (Dama dama). To this end, we develop a numerical stage-structured model, accounting for species-specific life history characteristics, gender, and stage-specific hunting values. Two contrasting management regimes are considered: optimal joint management of the two species and management where the decision maker is ignorant about interspecific competition. Results from our case study show that the presence of interspecific competition reduces roe deer population size and harvest by 30% and 47%, respectively, and reduces the net present value by 9%. High interspecific competition could lead to the exclusion of the roe deer from the area. In contrast, ignorance about the level and consequences of interspecific competition has no impact on harvest decisions and revenues. The explanation is the higher hunting benefits for fallow deer. Summary for Managers Wildlife managers need bioeconomic models for decisions on ecologically interdependent species. This study investigates optimal joint management of roe and fallow deer when the fallow deer exerts a negative impact on roe deer due to interspecific competition. Results show that interspecific competition reduces the net present value of hunting at the study site by 9%. Regulations will not increase the net present value of hunting in a situation where the manager is ignorant of interspecific competition.
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| 49. |
- Johansson, Maria, et al.
(author)
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Factors governing human fear of wolves : moderating effects of geographical location and standpoint on protected nature
- 2016
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In: European Journal of Wildlife Research. - New York : Springer. - 1612-4642 .- 1439-0574. ; 62:6, s. 749-760
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Journal article (peer-reviewed)abstract
- This study analyses psychological antecedents of feelings of fear of wolves in a proportional sample of the Swedish population (national sample, n = 545) and in a sample of people in counties with wolf presence (regional sample, n = 1,892). Structural equation modelling of survey data suggests a dual pathway to self-reported fear. One path encompasses the appraisal of the environmental context operationalised as a potential wolf encounter. The second path concerns the appraisal of the social context assessed as social trust in managing authorities. The relative importance of the paths differs between the national and the regional sample, and between people in the administrative centre of the region and the regional periphery. We show that the public's fear of wolves should be addressed both at an individual level, focusing on situations with potential encounters, and at a collective level, by strengthening the trust between the public and authorities, and regional variation should be considered.
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| 50. |
- Lozano, Julian E., et al.
(author)
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Heterogeneous impacts of large carnivores on hunting lease prices
- 2021
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In: Land use policy. - : Elsevier. - 0264-8377 .- 1873-5754. ; 101
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Journal article (peer-reviewed)abstract
- Notwithstanding their crucial role in ecosystem functionality, large carnivores generally entail economic costs to hunters due to competition for the same prey. This cost could potentially vary depending on carnivore density and the game hunting values at stake. We estimate a hedonic price model applying the unconditional quantile regression method in order to investigate the impact of large carnivores along the distribution of hunting lease prices in Sweden. We compare these impacts with those obtained from conditional quantile regressions, as well as from ordinary least squares estimations. Based on the unconditional quantile estimates, our results indicate that wolf, lynx and bear can exert a negatively significant effect in the middle range of the outcome distribution, while no significant impact is found in the lower quantiles. For the statistically significant quantiles, the average marginal implicit price of an additional wolf territory in the study area is around 3.35 million Swedish kronor (SEK) per year, namely 358 thousand Euros (EUR). This corresponds to an annual reduction in the mean hunting lease price per hectare by 21% in the municipality where the territory is established. Similarly, an additional lynx family group entails an average marginal implicit price of SEK 3.55 million (EUR 379 thousand) per year, and an additional brown bear individual entails an average marginal implicit price of nearly SEK 110 thousand (EUR 11.6 thousand) per year. The corresponding impact on the mean hunting lease price per hectare is a reduction by 22.4% and 0.6% for an additional lynx family group and an additional brown bear individual, respectively, in the municipality where the establishment occurs. Results can be useful for policies targeting the spatial distribution of large carnivores. © 2020 The Authors
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