Publications
Quantifying Trail-Induced Fragmentation in Protected Natural Areas Using Large-Scale GPS Trajectory Analysis
A novel analysis reveals that Switzerland's extensive trail network within protected areas, including the UNESCO World Heritage Site Swiss Alps Jungfrau-Aletsch, induces minimal habitat fragmentation, affecting less than 1% of these regions. The study, leveraging large-scale GPS trajectory data and spatial analysis, found significant variation across different ecosystems, with alpine alluvial vegetation, dry meadows, and high marshes experiencing the highest fragmentation (up to 1.87%), while the Swiss National Park remained pristine (0.00%). A buffer sensitivity analysis confirmed that a 10-meter buffer provides the most ecologically relevant measure, indicating that core habitats—areas over 100 meters from trails—cover 86.7% of protected areas on average. Validation against official trail data showed high accuracy (87.3%), underscoring the reliability of crowd-sourced GPS tracks. This scalable methodology offers a reproducible approach for monitoring recreational impacts, demonstrating that Switzerland's trail network is well-managed and does not significantly fragment its protected landscapes.
Remoteness on a Vertical Axis – Social Dynamics of Ski Touring in the Alps
Ski touring in the Swiss Alps Jungfrau-Aletsch region reveals a paradox: participants actively seek remoteness and authenticity, despite proximity to urban centers. This vertical remoteness—defined by ascent and navigation of demanding landscapes—creates social hierarchies based on skill and endurance, challenging conventional notions of rural-urban access. The study uses a patchwork ethnographic approach, combining field observations, interviews, online media, and historical sources, to explore the cultural and ecological dimensions of ski touring. It highlights the tension between sustainable leisure activities and the pursuit of 'authentic' nature experiences, offering new insights into mobility and social dynamics in alpine tourism.
Continuous monitoring of a glacier’s extinction
A tiny remnant of Pizolgletscher, a glacier in the Swiss Alps, persists under rockfall debris despite losing 98% of its volume since monitoring began 130 years ago. The glacier is considered extinct since 2022, but detailed long-term data on mass balance, area, and volume provide unprecedented insights into the processes leading to a glacier's disappearance. This case study highlights that even very small glaciers can reflect broader regional trends in mass balance variations during their final stages. The research also underscores the cultural significance of Pizolgletscher, as exemplified by a 2019 commemoration ceremony.
Heritage recognition of active geomorphological processes: The challenges of geoconservation beyond landforms
Active geomorphological processes, often overlooked in heritage assessments, are critical to the formation and evolution of landforms. This study introduces specific criteria for evaluating the heritage value of these dynamic processes, addressing challenges like defining functional perimeters, managing natural hazards, and balancing conservation priorities between processes and landforms. Through case studies in the Swiss Alps' Jungfrau-Aletsch region, it advocates for maintaining natural dynamics unless they threaten higher-value landforms or human safety. The research highlights a shift from static to dynamic geoconservation, emphasizing the need to protect both landforms and their formative processes.
The 2025 Blatten disaster in the Swiss Alps followed exceptional warming and highlights the vulnerability of people and heritage in glaciated landscapes
On May 28, 2025, the village of Blatten and nearby settlements in Switzerland's Lötschen valley were buried under 20 million cubic meters of rock and ice, marking a catastrophic event linked to unprecedented climate warming. This disaster occurred during the warmest decade recorded since at least 742 CE, underscoring the severe vulnerability of both people and heritage in glaciated landscapes. The study highlights the urgent need for adaptive strategies to mitigate future risks in such environments.
Elevation bias due to penetration of spaceborne radar signal on Grosser Aletschgletscher, Switzerland
A significant elevation bias of up to 4–8 meters, caused by the penetration of X-band radar signals into perennial firn, was identified on Grosser Aletschgletscher using TanDEM-X DEMs. This bias, exceeding half the decadal ice loss rate, stems from volume scattering within firn layers, misaligning the radar-detected surface with actual firn horizons. The study compared near-simultaneous TanDEM-X and Pléiades optical stereo-imagery to quantify this effect, supported by ground-penetrating radar and snow core data. To mitigate such biases, researchers recommend using DEMs from consistent timeframes over long periods and applying corrections when integrating optical and radar-derived elevations.
The Higher the Better: Climate Change and House Prices in Swiss Ski Resorts 2001-2020
Higher altitudes and lower temperatures in Swiss ski resorts are linked to increased house price appreciation between 2001 and 2020, unlike in non-ski resort municipalities. This counterintuitive trend suggests that buyers may prioritize snow-reliant areas over traditional climate risks like flooding. The study analyzed 303 municipalities across 45 ski resorts using panel regression, examining altitude, temperature, and snow cover duration. While no direct link was found to snow cover changes, indirect economic factors such as income and tourism were also explored. These findings challenge conventional assumptions about climate change impacts on property values.
Conservation of World Heritage glacial landscapes in a changing climate: The Swiss Alps Jungfrau-Aletsch case
Glacial landscapes, many of which are UNESCO World Heritage Sites, face significant threats from rapid glacier retreat due to climate change, potentially undermining their Outstanding Universal Value. A study focusing on the Swiss Alps Jungfrau-Aletsch property reveals that as glaciers shrink, the geoscientific value of these sites will increasingly depend on preserved glacial landforms like moraine ridges, rather than the glaciers themselves. This shift necessitates enhanced protection for these inherited features to maintain their historical and scientific significance. Additionally, the aesthetic appeal of such landscapes may diminish without glaciers, suggesting a transition from traditional glacier tourism to geotourism could help sustain both conservation efforts and public engagement with these evolving landscapes.
Constraining regional glacier reconstructions using past ice thickness of deglaciating areas – a case study in the European Alps
A new method to reconstruct glacier ice thickness distribution in the European Alps, particularly in the Swiss and Austrian Alps, has been developed. This approach overcomes the limitations of traditional retreat-based observations by incorporating an empirical relationship between ice viscosity at observed locations and DEM-differencing data from glacier margins. The study reveals that relying solely on thickness observations from previously glacierized areas would underestimate average ice thickness by approximately 40%. By applying a topography-based viscosity scaling, the researchers accurately modeled glacier volumes for two timesteps (1970 & 2003). This method significantly improves regional glacier volume estimates, with a derived volume of 125.4±24.7 km³ for the 1970s, while acknowledging larger uncertainties at a local scale.
Glacier tourism without ice: Envisioning future adaptations in a melting world
Climate change is dramatically reshaping high mountain environments, with Alpine glaciers retreating at unprecedented rates. A new perspective proposes three adaptive strategies for glacier tourism to mitigate the impact of ice loss: expanding geotourism, transitioning last-chance tourism into 'dark tourism,' and leveraging virtual reality to recreate disappearing glaciers. These strategies were explored through case studies of the UNESCO-listed Aletsch Glacier (Switzerland), Mer de Glace (France), and Mortaretsch Glacier (Switzerland). The study suggests that by embracing these approaches, glacier tourism can evolve to sustain visitor engagement even as physical ice diminishes.
Social Media as a Management Tool: Opportunities for Sustainable Heritage Destinations
Social media-driven tourism trends can lead to unsustainable development, commodification, and cultural dissonance in heritage destinations. A quantitative content analysis of posts and reviews from Instagram, TripAdvisor, and Airbnb across five UNESCO World Heritage Sites, 13 Regional Nature Parks, and two Biosphere Reserves in Switzerland revealed key visitor distribution patterns during and after the COVID-19 pandemic. These insights offer management agencies a tool to strategize for more balanced tourist flows within heritage areas. The study's methodology, applicable to diverse contexts, highlights the potential of social media analysis in shaping sustainable governance and visitor management systems for large protected areas.
Geotourism and Interpretation of Geomorphology in Mountain Tourism
Only half of the geotourism offerings in the Swiss Alps Jungfrau-Aletsch UNESCO World Heritage Site successfully convey the scientific value of its geomorphological features, despite their potential to go beyond mere aesthetic appeal. This study analyzed 33 mediation approaches using a multicriteria framework, revealing that while some effectively highlight the site's patrimonial significance, others fail to connect visitors with its scientific and cultural heritage. The research underscores the importance of intentional design in geotourism to ensure both educational engagement and preservation awareness.
Géotourisme et médiation scientifique dans l’offre touristique en montagne
Approximately half of the geotourism offerings in the Swiss Alps Jungfrau-Aletsch UNESCO World Heritage Site effectively communicate the site's scientific value, moving beyond mere aesthetic appeal to highlight its geological significance. This study analyzed 33 mediation approaches using a multicriteria framework, revealing that while some succeed in revealing the site's patrimonial dimension, others fail to connect visitors with its scientific heritage. The research underscores the potential of geotourism to diversify mountain tourism while fostering awareness of geological landscapes, though challenges remain in ensuring consistent scientific communication.
Sharing Scientific Knowledge on Glaciers to the General Public: The Role of Glacier Interpretation Centres in Mountain Tourism Diversification Strategies
Glacier Interpretation Centres (GICs) play a pivotal role in diversifying mountain tourism and mitigating the impacts of climate change on glacier destinations. A comparative analysis of three GICs—Espace Glacialis, Glaciorium, and World Nature Forum—reveals that these centres effectively leverage scientific knowledge to promote glacier heritage while adapting to the shrinking glacial landscapes caused by climate change. The study highlights how local stakeholders collaborate to create and manage GICs, which not only enrich tourism experiences but also dynamize local economies. This approach demonstrates a promising strategy for sustaining tourism in vulnerable mountain regions.
Transmettre le savoir scientifique sur les glaciers au grand public : rôle des centres d’interprétation glaciaire dans les stratégies de diversification touristique en montagne
Glacial interpretation centers (CIGs) play a pivotal role in diversifying mountain tourism while addressing climate change impacts. Despite significant glacial retreat—with Alpine glacier volumes halving since the end of the Little Ice Age—local stakeholders are proactively leveraging scientific knowledge to sustain and enrich tourism. A qualitative, historical-geographical study of three CIGs (Espace Glacialis in France, Glaciorium in Chamonix, and World Nature Forum in Switzerland) reveals that these centers effectively blend scientific education with tourism development. By analyzing territorial dynamics and stakeholder interactions, the research demonstrates how CIGs contribute to economic resilience in mountain regions, even as they grapple with environmental challenges.
Wertvolles Geoland Schweiz
Switzerland's diverse landscapes, shaped by its unique geology, play a pivotal role in supporting biodiversity, influencing climate, and underpinning cultural development. However, the significance of this geological heritage remains underappreciated by the public, policymakers, and authorities, leading to limited integration into planning processes or educational initiatives. The study 'Wertvolles Geoland Schweiz' highlights the untapped potential of Switzerland's geology in sustainable development and environmental education, advocating for its protection and valorization through frameworks like the UNESCO Global Geopark Programme. This approach ensures regions with internationally significant geological features can contribute to broader educational and developmental goals.
Glacier Movement Prediction through Computer Vision and Satellite Imagery
A novel approach using computer vision and high-resolution satellite imagery demonstrates high accuracy in predicting glacier movement, offering valuable insights into the evolution of ice coverage. Researchers applied a dense optical flow algorithm to time-series images of the Jungfrau-Aletsch-Bietschhorn (JAB) glacier in the Swiss Alps, successfully extracting motion vectors that closely matched observed values. This method, utilizing Normalized Difference Snow Index (NDSI), proves efficient for monitoring glacial changes, particularly under the increasing pressures of climate change. The study highlights the potential of satellite-based techniques to provide precise and timely data on glacier dynamics, aiding in broader environmental assessments.
The UNESCO World Heritage Swiss Alps Jungfrau-Aletsch – protecting the cultural landscape by preserving the traditional irrigation system in the Upper Valais
Traditional irrigation systems within the UNESCO World Heritage Swiss Alps Jungfrau-Aletsch (SAJA) are critical to maintaining biodiversity and cultural landscapes, yet they face decline due to agricultural changes. The Great Aletsch Glacier and iconic peaks of Eiger, Mönch, and Jungfrau form a unique natural and cultural landscape, but traditional irrigation techniques—essential for meadows and vineyards—are being replaced by modern sprinkler systems or abandoned. To address this, the project 'Preservation of Traditional Irrigation in the Upper Valais' identified at-risk areas and engaged local stakeholders to develop solutions. Proposed strategies include financial compensation, volunteer platforms, institutionalization, education, awareness campaigns, and the establishment of an Expert Commission for irrigation landscapes. These measures aim to safeguard both ecological diversity and cultural heritage in this high-altitude region.
Besuchermonitoring Aletschwald : Schlussbericht
A decline in visitor numbers to the Aletschwald, a UNESCO World Heritage Site in the Swiss Alps, has been observed since previous studies, yet the distribution of visitors across days and seasons remains consistent. The study, conducted by Pro Natura, revealed that while overall visits dropped to around 30,000 annually, peak usage occurs between 11 AM and 3 PM during warmer, sunnier weather, particularly at hotspots like the Brandschneise trail and Grünsee area. Despite strict protection measures—such as designated rest areas with a 41% open ground (trample damage) compared to 10% in restricted zones—vegetation regeneration shows mixed results, with sensitive moss layers recovering by 21% in forbidden areas but worsening in high-traffic zones like the Rastplatz. Visitors, predominantly ecologically aware and rule-compliant, report optimal experiences when group sizes remain small (under seven people). The findings underscore the need for adaptive management strategies, including social capacity indicators and physical barriers like boardwalks, to balance tourism with ecological preservation while ensuring future monitoring aligns with measurable thresholds of acceptable change.
Rapid glacier retreat and downwasting throughout the European Alps in the early 21st century
European Alpine glaciers experienced rapid retreat and significant ice mass loss between 2000 and 2014, with the Swiss Glarus and Lepontine Alps showing the most pronounced downwasting. Using remote sensing techniques on extensive optical and radar imagery covering 93% of Alpine glacier volume, researchers estimated a mass loss of 1.3 ± 0.2 gigatons annually for the entire region. While central Alpine glaciers followed previous trends, lower mountain ranges showed less severe changes. These findings underscore the urgent need to address socio-economic impacts such as water resource management, risk assessments, and tourism.
Tracing devastating fires in Portugal to a snow archive in the Swiss Alps: a case study
A single, intense wildfire event in Portugal in 2017 deposited an exceptional amount of microscopic charcoal particles in the snowpack of the Swiss Alps, equivalent to what would typically accumulate over a year in ice cores. This finding demonstrates that high-alpine snow and ice archives are highly sensitive to distant fire events, unlike sedimentary archives which primarily record local fires. Researchers analyzed black carbon (BC) and microscopic charcoal in snow near the Jungfraujoch research station, combined with backward trajectory modeling and remote sensing data, to link the observed BC peak on June 22-25, 2017, to the Portuguese wildfires. The study highlights the potential of ice cores as archives for long-distance fire events and estimates that this single event emitted at least 203.5 tons of black carbon.
Traditionelle Bewässerung – ein Kulturerbe mit Zukunft?
Traditional irrigation systems in the Swiss Alps Jungfrau-Aletsch have sustained water supply in arid valleys for centuries while shaping a culturally and ecologically rich landscape. These systems, characterized by communal management models, continue to serve as a blueprint for sustainable water use today. However, they face significant challenges that threaten their long-term viability. The study highlights the dual role of these irrigation practices—preserving biodiversity and historical architecture while adapting to modern demands. It underscores the need for innovative strategies to ensure the survival of this cultural heritage in the face of environmental pressures.
Hidden diversity in European bees: Andrena amieti sp. n., a new Alpine bee species related to Andrena bicolor (Fabricius, 1775) (Hymenoptera, Apoidea, Andrenidae)
A new Alpine bee species, Andrena amieti, has been identified within the UNESCO World Heritage Site 'Swiss Alps Jungfrau-Aletsch', revealing hidden diversity among European bees. Phylogenetic analysis of genetic and morphological data confirmed its distinct status alongside three other closely related species: A.montana and A.allosa. The study found that A.amieti is bivoltine, with spring and summer generations exhibiting different pollen host preferences—spring being polylectic while the summer generation favors Campanulaceae. Additionally, two divergent mitochondrial lineages coexist in sympatry within this species, suggesting potential cryptic diversity. The research also resurrected A.croatica as a valid species and elevated A.pileata to species rank, proposing that such hidden diversity may be widespread in southern European Andrena (Euandrena). An identification key for central European members of the subgenus Euandrena was provided.
First measurement of ice‐bedrock interface of alpine glaciers by cosmic muon radiography
Scientists have successfully applied cosmic muon radiography to map the bedrock topography beneath alpine glaciers for the first time, revealing critical insights into glacial erosion mechanisms. Using emulsion film detectors installed along the Jungfrau railway tunnel in the Swiss Alps, researchers measured the ice-bedrock interface under Aletsch Glacier, uncovering a NE-SW striking bedrock that dips at 45° ± 5°, extending up to 50 meters below the surface. This innovative approach, leveraging cosmic ray muons, offers unprecedented precision in studying glacial geology and promises to advance our understanding of how glaciers shape underlying landscapes.
Managing a World Heritage Site – Potentials and Limitations of Transdisciplinary Approaches
Transdisciplinary approaches offer significant potential for balancing conservation and economic development in UNESCO World Heritage Sites, but their effectiveness is threatened by inherent power dynamics. A study on the Swiss Alps Jungfrau-Aletsch World Heritage Site highlights that while such collaborative frameworks foster mutual learning among diverse stakeholders, the benefits are often undermined by power struggles within participatory processes. The research re-examines three key challenges in transdisciplinary settings: stakeholder integration, perceptions and positions, and negotiability and implementation, demonstrating both the promise and limitations of this method for sustainable management.
Sustainable regional development: Reconciling global and local dynamics and stakes in the Swiss Alps
Sustainable development in the Swiss Alps Jungfrau-Aletsch World Heritage Site (WHS) hinges on local and regional dynamics, not global or national frameworks. Research reveals that while tourism drives economic growth, achieving sustainability requires balancing diverse interests through quality dialogue. Unlike traditional political or administrative units, this WHS crosses boundaries, complicating governance. Studies using population data, employment indicators, and stakeholder interviews found that local solutions are essential, as broader policies often lack specificity. The global WHS label alone does not guarantee sustainability; success depends on tailored regional strategies.
"Mir hei e Verein, i ghöre drzue" - Vereine in der Welterbe-Region
Clubs and societies in the Swiss Alps Jungfrau-Aletsch UNESCO World Heritage region play a crucial role beyond recreation, fostering social cohesion, integration, and democratic culture. These associations bring diverse groups together, strengthening communal bonds and cultural identity while contributing to broader societal values. The study examines the types of clubs present—ranging from sports to cultural societies—and their multifaceted impact on local communities.
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