Publications
Does vineyard abandonment negatively affect the taxonomic and functional diversity of ground-dwelling beetles?
Conventionally managed vineyards and grazed grasslands in the Upper Middle Rhine Valley support higher taxonomic and functional diversity of ground-dwelling beetles compared to set-aside fallows, which show significantly reduced conservation value. The study, conducted across 40 sites using pitfall traps, reveals that abandonment leads to declines in open landscape and xerothermic beetle species, while (semi)-natural habitats positively influence beetle diversity. Grazing emerges as a viable alternative management strategy to maintain biodiversity in set-aside vineyards, counteracting secondary succession and preserving landscape heterogeneity. These findings underscore the importance of active land management in conserving insect diversity in xerothermic regions.
Formulating orbifold Euler characteristics of quotient singularities with applications to Rhine valley flood frequency
A novel application of orbifold Euler characteristics to flood frequency analysis reveals four distinct flood regime clusters along the Rhine Valley, each linked to specific quotient singularity types. The study leverages algebraic and topological methods to derive computational formulas for these characteristics, connecting them to Banach space techniques for convergence analysis. Using discharge records from 22 gauging stations spanning 1950–2022, researchers found that the orbifold-based model significantly improved flood frequency predictions compared to standard Generalized Extreme Value (GEV) fits, with a 14.8-unit improvement in the Akaike Information Criterion. The approach also correctly ranked 19 of 22 stations by observed flood frequency, demonstrating its robustness and accuracy.
Impacts of warmer temperatures on the above- and belowground system of four economically important timber species
A recent study reveals significant species-specific responses of four major timber species to warmer temperatures, highlighting the vulnerability of conifers compared to broadleaved species. Research comparing forest stands in northern Germany and the Upper Rhine Valley—where mean annual temperatures are 2°C higher—found that European beech (Fagus sylvatica) and sessile oak (Quercus petraea) showed increased sensitivity to water stress, while Scots pine (Pinus sylvestris) and Douglas fir (Pseudotsuga menziesii) exhibited stronger negative responses to summer heat. Belowground, fine root biomass and productivity declined for beech, pine, and Douglas fir in the warmer region, whereas oak remained resilient with trends toward increased productivity and longevity. The study underscores the need for adaptive forest management strategies to enhance resilience under climate change.
Rock Buntings in Central Europe: Phylogeographic connectivity and a current inventory in the Upper Middle Rhine valley
A long-term study of the Rock Bunting (Emberiza cia) in Germany's Upper Middle Rhine Valley reveals unexpected genetic connectivity among its subpopulations, despite a continuous decline. Contrary to expectations, analysis of 122 samples—using mitochondrial DNA (cytochrome b gene) and nuclear microsatellite markers—showed no geographic clustering, indicating ongoing gene flow between populations along the Middle Rhine, Nahe, Main, Moselle, and Ahr rivers. This challenges assumptions about isolation in fragmented habitats, such as rocky vineyards, where the species is increasingly threatened.
Wild grapevine (Vitis vinifera subsp. sylvestris) in Germany: Is reintroduction a viable approach?
Despite long-term reintroduction efforts, the wild grapevine (Vitis vinifera subsp. sylvestris) remains critically endangered in Germany's Upper Middle Rhine Valley, with only 16% of planted individuals showing high vitality and reproductive potential by 2018. A survey revealed that 55% of plants introduced since 2012 had died, primarily due to unsuitable light conditions caused by canopy cover. The species faces persistent threats from habitat degradation, hybridization, and slow establishment, exacerbated by its dioecy and late reproductive age. Researchers emphasize the need for targeted renaturation measures, such as restoring natural flooding dynamics, to create viable habitats and ensure long-term survival. Regular monitoring is crucial to assess reintroduction success and protective measures.
Environmental Drivers of Local Demography and Size Plasticity in Fire Salamanders (Salamandra salamandra)
Research on fire salamanders (Salamandra salamandra) in the Upper Middle Rhine Valley reveals that local habitat quality significantly influences adult body size, driven by growth rates of aquatic larvae and terrestrial juveniles. The study found that non-lethal heavy metal contamination in streams leads to smaller juveniles and adults, demonstrating carry-over effects between life stages. While populations showed similar age distributions, variation in body size was strongly linked to environmental factors such as landscape-induced mortality risks from roads and agriculture. Notably, Rhine Valley populations exhibited generally smaller adult sizes compared to other regions, suggesting an unidentified environmental driver at play.
Middle Paleolithic Sites atop the Scoria Cones of the East Eifel Volcanic Field of the Central Rhine Valley
A Neanderthal skull and Middle Paleolithic artifacts were discovered within the volcanic craters of the East Eifel, dating to the penultimate glaciation. These findings, uncovered during 1980s excavations led by researchers at Monrepos, reveal diverse lithic assemblages with high technological variability, indicating the use of both local and non-local raw materials. Neanderthals likely occupied these elevated positions for strategic advantages, such as landscape visibility and water sources, which may have also attracted game. The study highlights the significance of scoria cones in Middle Paleolithic settlement dynamics, suggesting that unmined volcanic craters in the region could harbor similar archaeological deposits.
Older than expected: fluvial aggradation of the Rhine's main terrace at Kärlich dated around 1.5 Ma by electron spin resonance
A groundbreaking discovery challenges the long-held understanding of the Rhine's main terrace aggradation, revealing it to be significantly older than previously estimated. New electron spin resonance (ESR) dating of quartz grains from sediment samples at the Mülheim–Kärlich clay pit in the Middle Rhine Valley (MRV) indicates an age of approximately 1.5 million years, predating earlier estimates by hundreds of thousands of years. This finding refines the chronostratigraphy of the site and provides the first numerical age control for key fluvial deposits along the MRV, addressing a critical gap in our knowledge of the region's Quaternary landscape evolution. The study leverages ESR dating to offer precise chronological constraints, enhancing our understanding of the Rhine's geological history and its archaeological and palaeoenvironmental significance.
Promoting plant diversity and habitat heterogeneity through vineyard terracing
Terraced vineyards significantly enhance plant diversity and habitat heterogeneity, offering a solution to counter shrub encroachment while maintaining economic viability. Extensively managed embankments within terraced systems support the highest species richness, characterized by perennial plants with low nitrogen requirements—traits increasingly rare in modern agricultural landscapes. In contrast, intensively managed inter-rows, whether in vertical or terraced vineyards, favor annual and ruderal species but do not match the diversity of embankments. Vineyard abandonment, meanwhile, leads to a decline in plant diversity as woody species dominate. The study analyzed 45 sites across Germany’s Upper Middle Rhine Valley, using vascular plant records, Ellenberg indicator values, and Grime's strategy types to assess how management intensity shapes vegetation. These findings underscore terraced vineyards' potential to balance biodiversity conservation with sustainable viticulture.
In Braubach, after the War
Braubach, a medieval village in the Upper Middle Rhine Valley, offers a unique perspective on post-war resilience and cultural preservation. The study highlights how the town, with its half-timbered buildings and scenic backdrop of vineyards and forests, remained largely intact after World War II, serving as a symbol of continuity amidst destruction. Notably, the Marksburg castle, initially damaged during the war, became an adventure playground for local youth before undergoing restoration to become part of the Rhine Gorge UNESCO World Heritage Sites. The narrative focuses on Peter's family, who lived near the town center with a clear view of the castle, illustrating the interplay between personal memory and collective heritage in a post-war context.
Orthopteran Diversity in Steep Slope Vineyards: The Role of Vineyard Type and Vegetation Management
Abandonment of traditional viticultural practices and the shift from vertically oriented vineyards to modern terraced systems significantly impact Orthopteran diversity, particularly for open-adapted species. Research along the Upper Middle Rhine Valley in Germany revealed that woody structures and fallow land reduce habitat quality, thereby decreasing local and landscape-scale Orthoptera diversity. In contrast, actively managed vineyard types with open inter-rows support heat-adapted grasshoppers (Caelifera), while terrace embankments with extensive management and taller vegetation benefit bush-crickets (Ensifera). Short, mulched vegetation in vertically oriented vineyards, however, favors the dominance of a single Caelifera species. The study underscores the importance of maintaining viticultural management on steep slopes for preserving both biodiversity and cultural landscapes.
What do dust sinks tell us about their sources and past environmental dynamics? A case study for oxygen isotope stages 3–2 in the Middle Rhine Valley, Germany
A novel study reveals significant shifts in dust provenance and atmospheric circulation patterns during the Upper Pleistocene in the Middle Rhine Valley, Germany. By integrating sedimentological, rock magnetic, and geochemical data with Sr and Nd isotope analysis, researchers identified distinct changes in environmental conditions between late oxygen isotope stage 3 (OIS 3) and the Last Glacial Maximum (LGM). The study highlights a clear negative correlation between grain size and anisotropy of magnetic susceptibility (AMS) within interstadials, suggesting continuous dust accumulation during pedogenic phases. Additionally, shifts in proxy data and isotope composition indicate increased landscape instability and enhanced wind activity towards the end of OIS 3. This comprehensive approach provides new insights into the dynamics of loess–palaeosol sequences (LPSs) and their response to Quaternary climate changes.
Cultural Landscape Compatibility Study Upper Middle Rhine Valley – A Proactive Tool for Preventive Monitoring of Complex World Heritage Landscapes
A systematic approach combining technical solutions with the assessment of attributes and values can effectively monitor transformations in complex World Heritage landscapes, supporting integrated management strategies that balance preservation and sustainable development. This study presents a proactive tool for preventive monitoring using the Upper Middle Rhine Valley as a case study, demonstrating its potential to assess impacts on Outstanding Universal Value (OUV) and integrity. The approach requires in-depth theoretical knowledge of OUVs, sound integration into legislative frameworks, and stakeholder participation at various levels to ensure full effectiveness.
Hybridization, ecogeographical displacement and the emergence of new lineages – A genotyping‐by‐sequencing and ecological niche and species distribution modelling study of Sempervivum tectorum L. (Houseleek)
A novel hybrid lineage of Sempervivum tectorum (Houseleek) has emerged in the Massif Central, France, through homoploid hybridization between Rhine Gorge and Pyrenean lineages. Genotyping-by-sequencing revealed hybrid admixture, while ecological niche modeling demonstrated a distinct niche for this new lineage, characterized by intermediate or extreme traits compared to its parents. Species distribution models suggest parapatric distribution during its likely origin in the Quaternary, with reproductive isolation potentially driven by differential climate responses. This study highlights hybridization as a key mechanism for speciation and ecogeographical displacement.
Maintaining steep slope viticulture for spider diversity
A shift from traditional vertically planted vineyards to modern terraced ones in Germany's Upper Middle Rhine Valley can help sustain economically viable viticulture while supporting diverse spider communities. Research found that terraced vineyards, alongside vineyard fallows and forests, create a landscape mosaic that enhances species diversity. While managed terraced vineyards favor xerophilic species adapted to open habitats, vineyard fallows support distinct late-successional spider communities. The study highlights the importance of maintaining open habitat structures through viticulture management and preserving landscape heterogeneity to conserve biodiversity.
The Multilingualism of the Early Middle Ages: Evidence from Peripheral Regions of the Regnum orientalium Francorum
Recent research reveals that peripheral regions of the former Roman Empire, particularly along the Rhine and Moselle valleys, underwent significant linguistic transformation from Latin to Germanic during the early Middle Ages. These areas became 'interference zones' where Latin, emerging Romance languages, and Germanic vernaculars coexisted, creating a unique multilingual landscape. The study leverages evidence from toponyms, loanwords, inscriptions, legal texts, and charters to demonstrate this linguistic shift, highlighting how orthography and textual analysis further illuminate the complex interactions between written and spoken language during this period. The findings underscore the widespread multilingualism among the upper classes in these regions, particularly between the 8th and 10th centuries.
Water as an Economic Resource and as an Environmental Challenge Within the Urbanisation Process of the Rhine Valley in the 13th Century
Medieval urbanization along the Upper and Middle Rhine Valley, particularly in the 13th century, demonstrated the critical role of water as both an economic resource and an environmental challenge. The study reveals that despite the region's humid climate, water management was a complex issue, requiring regulation and political negotiation among town lords, townspeople, and communes. It also highlights how deforestation for urban expansion exacerbated flood risks, posing significant threats to settlements. The research addresses methodological challenges posed by the scarcity of historical sources from this early medieval period, emphasizing the multifaceted nature of water's significance in shaping urban landscapes.
Human and animal deposits in circular pits of the 5th millennium between the Rhine and the Danube
A new hypothesis suggests that circular grave deposits, characterized by diverse typologies including burials and animal deposits, originated in Central Europe between the Czech Republic and Bavaria during the 5th millennium BCE. These early deposits exhibit a range of practices such as mixed deposits, anatomical segments, and isolated individuals in conventional or non-conventional positions. The phenomenon spread southward into the Upper Rhine Plain and Neckar Valley by the second third of the 5th millennium, likely influenced by the Münchshofen culture. This practice persisted through the Michelsberg culture in Lower Alsace and potentially diffused eastward via the Ludanice group in Slovakia to early Trichterbecherkultur groups. The study proposes a polycentric model for the diffusion of these deposits, challenging the traditional view of a linear spread from Chassean to Danubian regions. The research combines absolute chronology developments, bibliographic analysis, and recent archaeological discoveries to support this reinterpretation.
The Upper Middle Rhine Valley
The Upper Middle Rhine Valley, inscribed as a UNESCO World Heritage Site in 2002, stands out as Germany's sole organic cultural landscape. A comprehensive Masterplan developed in 2013 addresses the significant challenges threatening this unique region, which spans from Mainz to Koblenz and encompasses historic cities, vineyards, and vital transport routes. The valley has faced persistent pressures, highlighted by seven state of conservation reports between 2008 and 2017, underscoring the complexities of balancing preservation with development in such culturally rich landscapes. This study synthesizes these challenges and the Masterplan's responses, offering a model for managing other cultural landscapes globally.
Economic Aspects of Wine Tourism Sustainability at a UNESCO World Heritage Region of Upper Middle Rhine, Germany
A study on the Upper Middle Rhine Valley reveals that sustainability significantly influences wine purchasing decisions among visitors. The research highlights the high yearly volatility of wine tourism demand and the strong awareness of the region as a premier wine destination, despite culture and education being lesser travel motivations. It also identifies mode of arrival as an indicator of economic and environmental sustainability. Using data from 400 visitors at St. Goar-Loreley, the study demonstrates that integrating sustainability into broader destination management is crucial for enhancing the authenticity of sustainable wine tourism and protecting the region's natural and cultural resources. The findings advocate for innovative approaches that balance heritage, wine, and tourism to align with contemporary traveler expectations.
Identity and relationships of Sempervivum tectorum (Crassulaceae) in the Rhine Gorge area
A genetic analysis of Sempervivum tectorum (Crassulaceae) reveals that populations in the Rhine Gorge area form a distinct and homogeneous group, separate from those in the Massif Central, Alps, and Pyrenees. The study suggests this disjunct distribution likely reflects remnants of a once-wider range during Quaternary glaciation. Researchers used genotyping-by-sequencing on 52 accessions across the species' range to reconstruct phylogenetic relationships, finding the Rhine Gorge material is most closely related to the Massif Central clade. Taxonomic recognition for the Rhine Gorge group was dismissed due to morphological and nomenclatural reasons.
Better Active than Radioactive! Anti-Nuclear Protest in 1970s France and West Germany
Anti-nuclear protests in 1970s France and West Germany formed a transnational movement challenging the legitimacy of nuclear power, mirroring the globalized nature of nuclear technology. This study reveals that while geographical proximity intensified protest activities—particularly along the Upper Middle Rhine Valley—a shared network of resistance emerged despite varying local expectations and tactics. The research distinguishes between concrete concerted actions and symbolic strategies, blurring the line between comparative and shared history. By centering on personal encounters and oral histories, it provides a nuanced account of how protesters navigated national, social, and cultural boundaries, offering new insights into the spatial dynamics of transnational activism.
The Cultural Project: Formal Chronological Modelling of the Early and Middle Neolithic Sequence in Lower Alsace
A significant hiatus between the end of the Linear Pottery culture (LBK) and the start of the Hinkelstein group, dating to around 4000 cal BC, has been identified in Lower Alsace, part of the UNESCO-listed Upper Middle Rhine Valley. This gap suggests a broader phenomenon across the Rhineland, with full landscape reoccupation only occurring during the Grossgartach phase. The study employed Bayesian statistical modelling of radiocarbon dates to analyze ceramic changes and settlement patterns, revealing a dynamic Neolithic period marked by frequent relocations, adjustments, and cultural shifts. Radical transitions were also documented at the end of the Middle Neolithic, offering new insights into the pace and nature of cultural change in this region.
Water surface temperature profiles for the Rhine River derived from Landsat ETM+ data
Research demonstrates that satellite-derived water surface temperature (RST) profiles can effectively complement in situ measurements along the Upper and Middle Rhine River, enabling the detection of longitudinal temperature gradients and heat discharges. By applying atmospheric correction methods—ATCOR2 and the Atmospheric Correction Parameter Calculator—to Landsat ETM+ thermal infrared data, the study achieved a mean accuracy of 0.5 ± 0.7°C compared to ground measurements. This approach addresses challenges like cloud cover, shadowing, and mixed pixel effects, providing a systematic tool for river temperature monitoring. The findings highlight the potential of remote sensing to improve water quality assessments in UNESCO-listed sites like the Rhine Valley.
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