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- Fohringer, Christian, et al.
(författare)
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Large mammal telomere length variation across ecoregions
- 2022
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Ingår i: BMC ecology and evolution. - : Springer Science and Business Media LLC. - 2730-7182. ; 22
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Tidskriftsartikel (refereegranskat)abstract
- Background Telomere length provides a physiological proxy for accumulated stress in animals. While there is a growing consensus over how telomere dynamics and their patterns are linked to life history variation and individual experience, knowledge on the impact of exposure to different stressors at a large spatial scale on telomere length is still lacking. How exposure to different stressors at a regional scale interacts with individual differences in life history is also poorly understood. To better understand large-scale regional influences, we investigated telomere length variation in moose (Alces alces) distributed across three ecoregions. We analyzed 153 samples of 106 moose representing moose of both sexes and range of ages to measure relative telomere lengths (RTL) in white blood cells. Results We found that average RTL was significantly shorter in a northern (montane) and southern (sarmatic) ecoregion where moose experience chronic stress related to severe summer and winter temperatures as well as high anthropogenic land-use compared to the boreal region. Our study suggests that animals in the northern boreal forests, with relatively homogenous land use, are less disturbed by environmental and anthropogenic stressors. In contrast, animals in areas experiencing a higher rate of anthropogenic and environmental change experience increased stress. Conclusion Although animals can often adapt to predictable stressors, our data suggest that some environmental conditions, even though predictable and ubiquitous, can generate population level differences of long-term stress. By measuring RTL in moose for the first time, we provide valuable insights towards our current understanding of telomere biology in free-ranging wildlife in human-modified ecosystems.
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| 2. |
- Cecconello, Marco, et al.
(författare)
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Conceptual design of a collimated neutron flux monitor and spectrometer for DTT
- 2021
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Ingår i: Fusion engineering and design. - : Elsevier. - 0920-3796 .- 1873-7196. ; 167
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Tidskriftsartikel (refereegranskat)abstract
- A conceptual design and performance studies for a collimated neutron flux monitor and neutron spectrometer for the Divertor Tokamak Test (DTT) facility are presented. This study is based on the single-null divertor configuration and for “Half Power” and “Full power” scenarios with 15 MW of negative-ion NBI, 29 MW of ECH and 3 MW of ICRF heating with a maximum neutron yield of 1.5 × 1017 s−1. Fast ion distributions (both from auxiliary heating systems and fusion born) have been simulated in TRANSP/NUBEAM and the corresponding neutron energy spectra have been calculated using DRESS. Synthetic diagnostics have been implemented to determine the neutron fluxes and spectra at the detector location. Neutron emissivity profiles, plasma position, core ion temperature and the ratio of thermal and non-thermal D ion populations can be obtained with good accuracy and time resolution.
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| 3. |
- Dressel, Sabrina, et al.
(författare)
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Achieving Social and Ecological Outcomes in Collaborative Environmental Governance : Good Examples from Swedish Moose Management
- 2021
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Ingår i: Sustainability. - : MDPI. - 2071-1050. ; 13:4
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Tidskriftsartikel (refereegranskat)abstract
- Collaborative governance approaches have been suggested as strategies to handle wicked environmental problems. Evaluations have found promising examples of effective natural resource governance, but also highlighted the importance of social-ecological context and institutional design. The aim of this study was to identify factors that contribute to the achievement of social and ecological sustainability within Swedish moose (Alces alces) management. In 2012, a multi-level collaborative governance regime was implemented to decrease conflicts among stakeholders. We carried out semi-structured interviews with six ‘good examples’ (i.e., Moose Management Groups that showed positive social and ecological outcomes). We found that ‘good examples’ collectively identified existing knowledge gaps and management challenges and used their discretionary power to develop procedural arrangements that are adapted to the social-ecological context, their theory of change, and attributes of local actors. This contributed to the creation of bridging social capital and principled engagement across governance levels. Thus, our results indicate the existence of higher-order social learning as well as a positive feedback from within-level collaboration dynamics to between-level collaboration. Furthermore, our study illustrates the importance of institutional flexibility to utilize the existing knowledge across stakeholder groups and to allow for adaptations based on the social learning process.
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| 8. |
- Dressel, Sabrina, et al.
(författare)
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Evaluating the outcomes of collaborative wildlife governance : The role of social-ecological system context and collaboration dynamics
- 2020
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Ingår i: Land use policy. - : Elsevier. - 0264-8377 .- 1873-5754. ; 99
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Tidskriftsartikel (refereegranskat)abstract
- The acknowledgement of uncertainty and complexity in social-ecological systems has increased the implementation of collaborative governance regimes for environmental issues. The performance of these new regimes to deliver favourable social and ecological outcomes must therefore be evaluated. We focus on the case of Swedish wildlife governance, which has a tradition of using collaborative elements. In relation to moose (Alces alces), these collaborative aspects were recently formalized in an amended policy. We aim to assess some aspects of this new regime's performance with respect to intermediate ecological outcomes (i.e. quota fulfilment). We use path analysis to test the causal effects of system context and collaboration dynamics on governance outcomes. Collaboration dynamics were assessed using a web-based survey sent to all stakeholders in Moose Management Groups (response rate = 82 %). Our originally specified model yielded a good fit (SRMR of .030 and robust TLI of .996) and explained 20 % of the variation in outcomes. Context variables revealed significant direct effects on collaboration dynamics and outcomes. Larger Moose Management Areas and fluctuations in forage availability required more time investment from actors, while high land use diversity and density of other ungulate species negatively affected moose quota fulfilment. Moose Management Groups that invested more time and perceived to have a good knowledge base achieved better quota fulfilment. Collaboration dynamics thus had a positive direct effect on outcomes. From a policy perspective, our results raise questions regarding institutional fit because context factors had significant negative effects on collaboration dynamics and the outcomes of the collaborative process.
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| 9. |
- Dressel, Sabrina, et al.
(författare)
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Perceived adaptive capacity within a multi-level governance setting : The role of bonding, bridging, and linking social capital
- 2020
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Ingår i: Environmental Science and Policy. - : Elsevier. - 1462-9011 .- 1873-6416. ; 104, s. 88-97
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Tidskriftsartikel (refereegranskat)abstract
- In 2012 Sweden implemented a collaborative governance regime for managing moose (Alces alces). This was guided by the awareness that decentralization and stakeholder participation can help to reduce conflicts, foster systematic learning, and handle complexity. However, previous research has highlighted that there are no blueprint approaches to the governance and management of natural resources. In this case, diverse multi-use landscapes, ever-changing ungulate populations, and other external stressors (e.g. climate change, wildlife diseases) can create challenges for collaborative institutions. Adaptive capacity is therefore needed as it allows a system and the actors involved to react successfully to social-ecological changes and to develop even in times of no imminent change or risk. Using Swedish moose management as an example of a multi-level governance system, this research assesses the critical determinants of adaptive capacity across levels. We developed and applied a psychometric approach to measure actors’ perceived adaptive capacity on two levels in the management system. A web-based survey was sent to Moose Management Groups (n = 765, response rate = 81 %) and Moose Management Units (n = 1,380, response rate = 71 %). Using structural equation modelling, we assessed the relative importance of governance aspects, different types of social capital, as well as human and financial capital on actors’ perceived adaptive capacity. Linking and bridging social capital in the system had significant impacts on both levels. Actors felt more prepared to handle future challenges in moose management when they perceived benefits through collaborations with levels below and expressed social trust in authorities and the management level above. Besides those similarities between the two levels, fairness was a more important determinant of actors’ perceived adaptive capacity on the lower management level. These results can contribute to a future improvement of the collaborative governance setting by finessing strategic interventions on different levels. Furthermore, our results illustrate the importance of scale when assessing the adaptive capacity of a system.
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| 10. |
- Eriksson, Benjamin, et al.
(författare)
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Determining the fuel ion ratio for D(T)and T(D) plasmas at JET using neutron time-of-flight spectrometry
- 2022
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Ingår i: Plasma Physics and Controlled Fusion. - : Institute of Physics (IOP). - 0741-3335 .- 1361-6587. ; 64
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Tidskriftsartikel (refereegranskat)abstract
- The fusion fuel ion ratio, nΤ/nD, is an important plasma parameter that needs to be tuned to maximize the power of a tokamak type fusion reactor. It is recognized as a parameter required for optimizing several ITER operating scenarios, and will likely be continuously monitored in future high-performance fusion devices such as DEMO. Tritium was recently introduced in the Joint European Torus (JET) plasma for the first time since the 1997 DTE1 and 2003 TTE campaigns, enabling the possibility to investigate fuel ion ratios. We present a method for measuring nΤ/nD using neutron time-of-flight (TOF) spectrometry. By fitting the measured neutron spectral features, the relative reaction rate intensities between different ion species can be inferred, from which the fuel ion ratio can be extracted for a corresponding modeled reactivity. Unlike previous measurements of nT/nD using neutron spectrometry, we utilize the neutron energy continuum produced in the three-body TT reaction to determine the fuel ion ratio for plasmas with large concentrations of tritium. Furthermore, the use of neutron TOF spectrometry has never previously been demonstrated for evaluating nT/nD. The method is applied to TOF spectra acquired with TOFOR (JET name KM11) and shown to be consistent with the optical JET diagnostic KT5P which uses optical spectroscopy of a modified Penning gauge plasma to measure tritium and deuterium concentrations in the divertor exhaust gas.
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