Publications
Assessing the Impact of Climate Change on the Landscape Stability in the Mediterranean World Heritage Site Based on Multi-Sourced Remote Sensing Data: A Case Study of the Causses and Cévennes, France
Climate change is significantly destabilizing the Causses and Cévennes, a UNESCO World Heritage Site in France. A study using multi-sourced remote sensing data from 1985 to 2020 revealed that this Mediterranean agro-pastoral landscape experienced warming and drying trends, leading to a decline in woodland coverage (from 76% to 66.5%), increased fragmentation, and shifts among land cover types like cropland, shrubland, and grasslands. Landscape stability showed marked spatiotemporal variations with an overall downward trend. Precipitation emerged as the dominant climatic factor influencing landscape stability, particularly through its interaction with temperature. These findings highlight vulnerabilities in Mediterranean heritage sites, offering critical insights for sustainable conservation strategies.
Geometry and tectonic history of the Northeastern Cévennes Fault System (Southeast Basin, France) : new insights from deep seismic reflection profiles
A new deep seismic reflection survey of the Northeastern Cévennes Fault System (NCFS) reveals its polyphase tectonic history, spanning 320 million years. The study identifies three major phases: initial normal faulting during the Lower Jurassic and Lower Cretaceous, reactivation as a transfer fault zone during Pyrenean shortening in the Upper Cretaceous, and subsequent Oligocene extension. These findings update the geological history of the Vivaro-Cévenol region and constrain structures affecting the Southeast Basin since the Mesozoic. The research provides critical insights for paleoseismological studies following the 2019 Le Teil earthquake (Mw4.9), aiding seismic hazard assessment in the region.
Impact of alteration corridors on karst reservoir organisation and evolution of groundwater flow path: An example from the southern border of the Larzac Causse, southern France
Alteration corridors, vertically elongated structures containing dissolution-collapse breccia, significantly influence the organization and evolution of karst reservoirs by facilitating fluid circulation between upper and lower aquifers that were once separated by a marly seal unit. These corridors, primarily oriented in a N-S direction on the Larzac Causse, enhance regressive erosion dynamics, capturing watersheds like the Vis River and determining the position of present-day pocket valley springs. The study used a 3D approach to correlate field observations with remote sensing, revealing that ghost-rock karstification plays a crucial role in the structure and evolution of the karstic reservoir. Additionally, residual alterites are evacuated during high-flow events, providing insights into connected reservoir volumes and associated flow dynamics. These findings highlight the importance of corridor networks as valuable targets for water exploration when located below the piezometric level.
Confronter le rapport solidarités/territoires dans les années 1990 et aujourd’hui : Le « lien social local » sur les « territoires » du Causse Méjan et de la Manche
This study reveals that the relationship between social solidarity and territorial identity varies significantly depending on the type of crisis faced by rural communities. By comparing two Mediterranean agro-pastoral landscapes—the Causse Méjan (1980s–2000s) and La Manche (present day)—researchers found that while past crises failed to sustain durable local solidarity, contemporary approaches in La Manche are better at identifying new pillars for resilient rural communities. The analysis highlights how methodological and epistemological shifts in research frameworks influence these outcomes, offering key insights into the geography of social cohesion.
Evidence for Mississippi Valley-type lead-zinc mineralization in the Cévennes region, Southern France, during Pyrénées orogeny
New paleomagnetic analysis reveals that Mississippi Valley-type (MVT) lead-zinc mineralization in the Cévennes region of southern France occurred during the Lower-Middle Eocene, coinciding with the Pyrénées orogeny. This challenges previous assumptions linking mineralization to Mesozoic continental extension and instead suggests it resulted from large-scale fluid flow associated with tectonic activity. The study combines paleomagnetic data with radiometric (U-Th-Pb) and isotopic (Sm-Nd) analyses of ore-stage fluorite, providing robust evidence for the timing and origin of these deposits.
How sensitive are intraplate inherited structures? Insight from the Cévennes Fault System (Languedoc, SE France)
A recent study challenges the notion that deformation within intraplate regions, such as the Cévennes Fault System (CFS) in Languedoc, SE France, is solely a consequence of tectonic events at plate boundaries. By combining U–Pb geochronology of fault-related calcites with structural analysis, researchers found continuous compressional activity along the CFS and its satellite structures from the Albian period through the Eocene, including during periods traditionally considered tectonically quiescent. This indicates that intraplate fault systems can experience low-intensity but regional deformation continuously over time, not just during high-rate plate boundary events. The study also highlights the significance of inherited structures in accommodating far-field deformation, as demonstrated by the recent Le Teil earthquake (Mw = 4.9) along the CFS.
Konservat-Lagerstätten from the Upper Jurassic lithographic limestone of the Causse Méjean (Lozère, southern France): palaeontological and palaeoenvironmental synthesis
The Upper Jurassic lithographic limestone of the Causse Méjean, France, has been identified as a significant Konservat-Lagerstätte, preserving exquisite fossils that offer unprecedented insights into Kimmeridgian–Tithonian coastal and lagoonal ecosystems. This study, spanning two decades of prospection, reveals a diverse fossil assemblage comprising marine organisms—such as algae, ammonites, belemnites, and a coelacanth—as well as terrestrial flora and fauna, including conifers and a rhynchocephalian. Ichnofossils, including limulid trackways and coprolites, further enrich the palaeoenvironmental record. The exceptional preservation of these fossils suggests a calm, shallow-marine setting, likely a lagoon occasionally connected to the sea. This research underscores the Causse Méjean's importance as a key site for understanding Upper Jurassic palaeobiodiversity and palaeoecology, comparable to other renowned European plattenkalks like Solnhofen.
Paleoseismological investigations of the La Rouvière fault, unexpected source of the 11-11-2019, Mw 4.9 Le Teil surface rupturing earthquake (Cévennes fault system, France)
A 2019 earthquake (Mw 4.9) in the Cévennes region of France revealed unexpected surface ruptures linked to the La Rouvière fault, part of the broader Cévennes fault system. Paleoseismological investigations, documented during the 2022 INQUA PATA Days, identified previously unrecognized fault activity in this Mediterranean agro-pastoral landscape. The study highlights the significance of such faults as seismic hazards in regions with low to moderate earthquake risk. By analyzing surface ruptures and geological evidence, researchers provided critical insights into the fault's behavior, contributing to better understanding of seismic risks in UNESCO World Heritage Sites.
Réflexions sur l’implantation et l’architecture des dolmens à couloir et à antichambre du Causse de l’Hortus (Hérault, France)
A distinct architectural pattern emerges among the massive dolmens of the Causse de l’Hortus, characterized by systematic antichambers framed by entrance pillars and substantial tumuli. These monuments, including those at Lamalou, Capucin, and Feuilles, form a geographically cohesive group with uniform spatial organization despite variations in material use. Comparative analysis reveals that these dolmens differ from other Languedocian examples in their internal space management, suggesting a unique geocultural adaptation. The study highlights the functional and symbolic significance of antichambers in monumentalizing the structures while underscoring regional architectural diversity within Neolithic sepulchral traditions.
The 2019 Le Teil surface-rupturing earthquake along the La Rouvière Fault within the Cévennes fault system (France): What does paleoseismology reveal?
Paleoseismological investigations reveal that the La Rouvière Fault (LRF) within the Cévennes fault system (CFS) experienced at least one surface-rupturing earthquake between 13.5 and 3.3 thousand years ago, challenging the assumption that it was inactive since the Oligocene. Additionally, evidence suggests a possible earlier event in the northern segment during the 16th century. The study, which analyzed Quaternary deposits to identify paleo-ruptures, highlights the fault's potential for recurring seismic activity and underscores the need for further investigations along other segments of the CFS.
Approche multidisciplinaire de sépultures collectives en grotte et en dolmen à la fin du Néolithique dans le Languedoc oriental et sud des Cévennes
A multidisciplinary analysis of Late Neolithic collective burials in southeastern France reveals distinct cultural practices between cave and dolmen burial sites. While both regions—Languedoc oriental and southern Cévennes—showed no significant differences in burial management, the Languedoc oriented exhibited a systematic exclusion of younger individuals, whereas the Cévennes displayed greater variability. Notably, dental markers of para-masticatory activity were found in dolmens of the Cévennes, suggesting basketry or leatherwork among those interred there, unlike cave burials. The study also uncovered evidence of soil preparation for burials, hinting at a symbolic or technical integration of burial sites into funerary practices. This research sheds light on regional variations in Neolithic mortuary customs and craft specialization.
Entre hôpitaux et auberges. L’accueil du voyageur en Cévennes à la fin du Moyen Âge
A dense network of roadside hospitals and inns emerged in the Cévennes region by the late Middle Ages, adapting to shifting travel demands. Initially driven by pilgrimage traffic, these establishments transitioned to accommodate growing commercial activity after the 13th century. While monastic contributions were minimal, smaller, specialized hospitals—particularly those linked to the Puy hospital network—flourished along challenging routes. By the mid-14th century, a more commercialized system of rural inns replaced the hospitals, maintaining functional infrastructure for travelers. This shift reflects how medieval landscapes evolved to balance charitable and economic needs, with roadside hospitality serving as both a care hub and a nexus for trade.
Space Use and Time Budget in Two Populations of Griffon Vultures in Contrasting Landscapes
Griffon Vultures (Gyps fulvus) adapt their foraging and home range behaviors to environmental conditions, with those in the Causses region exhibiting significantly higher activity levels compared to their Pyrenean counterparts. Caussean vultures spent 35% more time flying daily, landed twice as often to feed, and were 67% more active on the ground. Their movements appeared influenced by thermal availability, suggesting that breeding status, seasonality of food resources, and meteorological conditions play crucial roles in shaping their behavior. However, the study's inability to disentangle the effects of breeding constraints from environmental factors limits definitive conclusions.
Le tain du miroir, Anthropologie visuelle et bricolage institutionnel dans le réseau des Cévennes
A groundbreaking intersection of visual anthropology and institutional innovation emerges from the Cévennes, where Fernand Deligny's 1980 work, 'Singulière Ethnie,' both engages with and diverges from Pierre Clastres' anthropological framework. This study illuminates Deligny's unique position at the nexus of sensory ethnography and institutional improvisation, set against the backdrop of the Cévennes' cultural landscape. The research leverages the Paluche camera, a novel tool introduced in 1978 by Jean-Pierre Beauviala via Renaud Victor's ORTF research initiative, to explore how visual media can both document and shape institutional practices within this region. By analyzing Deligny's work through the lens of these dual approaches—sensory ethnography and bricolage—the study reveals the complex interplay between cultural preservation and adaptive governance in UNESCO World Heritage Sites.
Radio Solitude en Cévennes
A groundbreaking exploration of rural marginality through sound reveals how Radio Solitude en Cévennes, a 1976 France Culture initiative, transformed the voices of isolated Cévennes residents into cultural narratives. By analyzing archival radio broadcasts and written records, this study demonstrates that even in marginalized regions, local expressions can be amplified to challenge dominant representations. The research highlights the tension between institutional culture (France Culture's urban-centric focus) and rural authenticity, showing how temporary radio production in the Cévennes National Park created a unique sonic landscape of anonymity and agency. This approach offers a novel method for studying marginalized spaces through media archaeology.
Tectonic Record of Deformation in Intraplate Domains: Case Study of Far-Field Deformation in the Grands Causses Area, France
A new tectonic study reveals that the Grands Causses region, an intraplate domain north of the Pyrenean orogeny, has experienced far longer and more complex deformation than previously understood. Contrary to prior assumptions, the so-called 'Pyrenean deformation' began around 100 million years ago (Ma) during the Barremian-Aptian epoch, not during the late Eocene as thought, and persisted for over 60-70 million years. This challenges the conventional view of tectonic plates as rigid blocks, demonstrating that intraplate domains can be highly sensitive to deformation from neighboring plate activities. The research combined tectonic analysis with synkinematic geochronology of fault-related calcites, providing a novel timeline for both Mesozoic extension and subsequent compressional events linked to Pyrenean basin dynamics.
Trouver refuge dans les Cévennes, un réseau d'accueil dessiné entre les lignes de crêtes
A resilient network of solidarity has emerged in the Cévennes, Mediterranean agro-pastoral Cultural Landscape, providing sustained support to asylum seekers since 2015. Local collectives, composed of retired individuals and young activists, collaborate informally with established social or religious associations to offer daily assistance, accommodation, and advocacy. Operating across villages, these groups have formalized their efforts through an intercollective structure, ensuring long-term sustainability and broader visibility. This grassroots movement, born in response to the 'migratory crisis,' demonstrates how community-driven initiatives can consolidate into a robust system of refuge within UNESCO-listed landscapes.
Étude techno-économique du Moustérien de Pradayrol (Caniac-du-Causse, Lot) : entre mobilité des ressources lithiques et adaptation aux matériaux locaux, un exemple de gestion complémentaire des quartz et silex au Paléolithique moyen récent en Quercy
Neanderthals at the Pradayrol site (Caniac-du-Causse, France) demonstrated sophisticated adaptation to local lithic resources during the late Middle Paleolithic. Analysis of a quartz-dominated assemblage revealed distinct operational chains tailored to material properties—bipolar on-anvil debitage for quartz cobbles and discoidal flaking for both quartz and nearby flint. Imported Périgord flint exhibited a fragmented, ramified Levallois chain, contrasting with local methods. These findings highlight a strategic balance between technical expertise and environmental constraints, aligning Pradayrol with other Quercy sites of the period. The study combines technological analysis with economic insights to illuminate Neanderthal resource management strategies.
Histoire des Cévennes
The Cévennes, a unique Mediterranean agro-pastoral landscape, stands out for its lack of political or administrative unity, remaining divided between the Gard and Lozère departments. This region's historical significance is multifaceted, marked by its role as a refuge for Protestants during the Camisard rebellion, a haven for Jews during the Holocaust, and a key player in France's Resistance movement. Its economic history, from silk cultivation to coal mining during the Industrial Revolution, further underscores its importance. Recognized by UNESCO in 2011 for its cultural, religious, literary, and geographical distinctiveness, the Cévennes exemplifies a landscape shaped by resilience, resistance, and cultural diversity. The study 'Histoire des Cévennes' by Cabanel (2019) delves into this complex history, offering insights into how this region's identity has evolved over centuries.
Formes d’ érosion prémégalithiques et postmégalithiques sur les menhirs de calcaire du causse Méjean (Lozère)
A novel approach combining archaeological and geomorphological analysis reveals distinct pre- and post-megalithic erosion patterns on limestone menhirs from the Causse Méjean. Pre-megalithic forms—such as lateral basins and grooves—indicate the original outcrop origins of the blocks, while post-megalithic features (e.g., summit basins, rills) provide insights into erosion rates over millennia, with monuments serving as chronological markers. The study identifies karstic and periglacial influences on these forms, demonstrating how such dual methodologies enhance understanding of megalithic landscapes.
Trace metals from historical mining sites and past metallurgical activity remain bioavailable to wildlife today
Historical mining and metallurgical activity in France's UNESCO-listed Causses and Cévennes region continue to impact wildlife, with trace metals like cadmium, copper, lead, and zinc remaining bioavailable to free-ranging mammals such as wood mice. Researchers found that soil metal concentrations near ancient mining sites were one or two orders of magnitude higher than typical European levels, and these elevated levels correlated with increased kidney lead (and, to a lesser extent, cadmium) in the animals. Unlike copper and zinc, which did not show strong correlations, lead's persistence suggests long-term environmental effects on wildlife health, as evidenced by a negative relationship between kidney lead concentration and body condition. This study highlights the lingering ecological risks posed by historical mining, offering insights into the long-term fate of trace metals and their potential threats to both ecosystems and human health.
De l'habitat en terrasses à l'oppidum perché : à propos des sites de hauteur du Bronze final III et du premier âge du Fer dans les Garrigues du Languedoc oriental et les Cévennes
A shift in settlement patterns is observed between the Late Bronze Age IIIa and the early Iron Age in the Garrigues of eastern Languedoc and the Cévennes, with a transition from elevated terraced habitats to more accessible and varied high-ground sites. Initially, during the Bronze final IIIa, settlements were confined to suspended terraces on rugged terrains, but by the Bronze final IIIb, they expanded to include less steep terraces, plateau edges, rocky promontories, and isolated hills, often supplemented with natural fortifications or additional stone structures. While remnants of post-and-wattle dwellings persist, more substantial stone enclosures became common during the early Iron Age, with monumental fortifications emerging only in the second Iron Age. This study highlights the evolving strategies for habitation and defense in this UNESCO World Heritage landscape.
Drop Size Distribution Climatology in Cévennes-Vivarais Region, France
A five-year climatology of drop size distribution (DSD) in the Cévennes-Vivarais region reveals that orographic environment, season, atmospheric weather patterns, and rainfall types significantly influence microphysical processes, impacting rainfall characteristics and the relationship between rainfall rate and reflectivity factor. The study utilized a network of six OTT Parsivel optical disdrometers across two longitudinal transects to analyze these factors, confirming their role in shaping ground-level rainfall dynamics in this Mediterranean region prone to heavy rainfall and flash floods.
Dynamique des végétations sur le causse du Larzac au cours des 8000 dernières années : contribution de l’étude anthracologique du Rajal del Gorp (Millau, Aveyron).
A comprehensive anthracological study of the Rajal del Gorp cave on the Larzac Plateau reveals significant shifts in vegetation dynamics over the last 8,000 years, driven by postglacial climate warming. The research highlights a transition from pine-dominated landscapes to mixed oak-pine forests, with oak becoming dominant by the late Neolithic period. Rare heather taxa, linked to moderate forest opening or grazing, emerged during the Middle/Final Neolithic and persisted until the site's abandonment. This study provides novel insights into Holocene vegetation changes on the Larzac Plateau, contrasting with patterns observed in neighboring regions like the Causses Noir or southern sites at lower altitudes. The research is based on a 16-layered sediment sequence from the cave, offering the most detailed anthropogenic and environmental record for this area.
Le site des Causses à Saint-André de Sangonis (VIe siècle) et la place alimentaire des animaux dans la moyenne vallée de l’Hérault durant le haut Moyen Âge
A previously unknown archaeological site, the Causses, dating back to the 6th century, was discovered and excavated near Saint-André de Sangonis in the Hérault valley. This finding sheds new light on the high medieval agro-pastoral landscape of the region. Unlike conventional archaeological data, which often struggle to define occupation dynamics, this study leveraged archéozoological analysis to reveal insights into dietary practices and agricultural systems. The research, conducted during a large-scale excavation project in 2003, combined traditional archaeological methods with animal bone analysis to interpret the site's role within broader regional food production systems.
New Hettangian tracks from the Causses Basin (Lozère, southern France) complement the poor fossil record of earliest Jurassic crocodylomorphs in Europe
A new ichnological assemblage from the Hettangian Dolomitic Formation of the Causses Basin, southern France, reveals rare insights into early Jurassic crocodylomorphs. The tracks, attributed to Batrachopus isp., represent the first occurrence of this ichnogenus in Hettangian deposits of the region and the third in European lowermost Jurassic formations. The unique trackway, featuring tetradactyl pes and pentadactyl manus imprints, co-occurs with dinosaur tracks (Dilophosauripus williamsi and Grallator isp.), suggesting crocodylomorphs inhabited marginal-littoral environments alongside theropod-dominated faunas. Sedimentological analysis indicates these tracks were formed in a tidal to supratidal flat marsh periodically exposed above sea level, providing evidence of the ecological dynamics of this UNESCO World Heritage Site's early Jurassic landscape.
Portrait d’une écoféministe dans les Cévennes
A unique perspective on ecofeminism emerges from the lived experiences of a woman residing in the Cévennes. This account reveals that her ecofeminist identity is shaped by continuous immersion in forest environments and personal reflection, evolving as both an ethos and practice rather than a rigid ideology or political stance. Through hosting women seeking authenticity and organizing off-system gatherings, she demonstrates ecofeminism's potential as a tangible, experiential framework. The narrative underscores the significance of direct engagement with nature and communal bonds in redefining environmental ethics, offering a counterpoint to conventional theoretical approaches.
De la ruche-tronc à la ruche à cadres : ethnoécologie historique de l’apiculture en Cévennes
A historical ethnoecological study of beekeeping practices in the Cévennes region of France reveals that traditional trunk hives, used with local black bees, persisted until the 1970s before shifting to modern frame hives and hybridized bee races. This transition marked a shift from subsistence-level, landscape-integrated apiculture to a production-focused industry. The research, combining archival records, scientific literature, and oral testimonies, provides evidence of trunk hive use as early as the 17th century and contextualizes how social and economic changes drove this transformation. These findings highlight the need for balanced conservation strategies that reconcile the cultural heritage of traditional apiculture with modern economic development in UNESCO-listed agro-pastoral landscapes.
Fossiliferous Holocene tufa of Mende (Lozère, southern France): implication for the Atlantic vegetation of the Causses Basin
A rare Holocene fossiliferous tufa deposit near Mende, Lozère, southern France, provides unprecedented insights into the Atlantic vegetation of the Causses Basin. Radiocarbon dating and geomorphological analysis reveal that this calcite-rich deposit, linked to a karstic hydrological system, formed during the Atlantic period (Holocene). The flora, dominated by angiosperms, includes leaves and reproductive structures from species such as Acer platanoides, Corylus sp., Hedera sp., Salix cf. cinerea, and Tilia cordata. This discovery suggests that while Pinus-dominated forests and oak groves likely thrived in the northern part of the basin during this period, valleys were locally inhabited by diversified wet angiosperm-dominated forests. The study enhances our limited understanding of Atlantic floras in the region.
L’édification d’un « parc imaginaire » des Cévennes
A study of the Cévennes region reveals how literary works shaped a collective identity and influenced its development as a UNESCO World Heritage Site. From the 18th century, diverse genres—oral and written, fictional and realistic—created shared cultural and landscape markers, forming the basis for a regional identity. This 'imaginary park' concept gained traction in the mid-20th century, blending nostalgia for rural life with traditional practices like agriculture and pastoralism, aligning with sustainable development ideals. However, by the 2000s, efforts to inscribe the Cévennes as a mixed cultural landscape on UNESCO's World Heritage List faltered due to its failure to meet universal significance criteria. The research highlights how local identity clashes with global heritage standards while noting untapped potential from Anglo-Saxon biorégionalism, which integrates place-based identity with ecocentric approaches.
Les rongeurs du sondage Séronie-Vivien de la grotte d’âge Pléistocène moyen de Pradayrol à Caniac‑du‑Causse (Lot)
A significant discovery of rodent remains, including the extinct hamster Allocricetus bursae and the steppe lemming Lagurus lagurus, was made during a survey at the Pradayrol cave in Caniac-du-Causse (Lot), part of the UNESCO World Heritage Site 'The Causses and the Cévennes.' The analysis suggests that the cave's sediment layers represent an ancient phase of marine isotope stage 6, characterized by severe droughts but cold winters. The biodiversity observed indicates a transitional climate between arid and more humid conditions, likely due to the cave's strategic location on the edge of a high plateau overlooking a vast irrigated valley. This finding provides valuable insights into the paleoenvironmental history of the region during the Middle Pleistocene.
Multiregional Satellite Precipitation Products Evaluation over Complex Terrain
A comprehensive evaluation of nine high-resolution satellite-based rainfall (SBR) products reveals significant variability in their accuracy over complex terrains, with many underestimating wet season precipitation and overestimating dry season totals. The study, spanning nine mountainous regions globally—including the French Cévennes—ahead of the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis dataset, found that gauge-adjusted SBR products perform better but depend on the representativeness of rain gauge networks. This research highlights the challenges and potential improvements in using SBR data for hydrological studies in diverse landscapes.
Terrestrial plants and marine algae from the Late Jurassic lithographic limestone of the Causse Méjean (Lozère, southern France)
A new Late Jurassic flora, comprising terrestrial plants and marine algae, has been discovered in the lithographic limestone of the Causse Méjean in southern France. This is the first documented Kimmeridgian/Tithonian flora from the region, revealing a unique co-occurrence of land-based vegetation—including bennettitaleans, conifers, and pteridosperms—and marine dasyclad algae. The fossilized remains suggest preservation in a protected, flat environment, likely a brackish or marine lagoon influenced by both continental and marine conditions. The study indicates that coastal habitats during this period were dominated by sub-arborescent vegetation adapted to hot, dry conditions, providing insights into the palaeoenvironmental adaptations of Late Jurassic flora.
The Camisard Uprising: War and Religion in the Cévennes
The Camisard Uprising (1702–1705) was a violent religious and political conflict in the Cévennes region of southern France, marked by brutal clashes between Protestant rebels, known as Camisards, and French royal forces. This study highlights the uprising's complex interplay of religious fervor, regional identity, and military strategy, drawing parallels with historical conflicts such as the Albigensian Crusade, Jewish persecution under Nazi rule, and French Resistance during World War II. The research leverages David Crackanthorpe’s deep familiarity with the Cévennes landscape and his expertise in comparative historical analysis to provide vivid character sketches of key figures, including rebel leaders like Jean Cavalier and royal officials such as Nicolas de Lamoignon de Basville. Additionally, it incorporates contemporary accounts to contextualize the Camisards' motivations, blending humor and irony into a nuanced narrative that challenges simplistic interpretations of their actions.
Application of combined time‐lapse seismic refraction and electrical resistivity tomography to the analysis of infiltration and dissolution processes in the epikarst of the Causse du Larzac (France)
Combined time-lapse seismic refraction and electrical resistivity tomography reveal that infiltration processes in the epikarst of the Causse du Larzac (France) are strongly influenced by dissolution, particularly ghost-rock weathering. This process attacks the dolostone rock frame, leading to significant velocity variations that challenge explanations based solely on the Biot–Gassmann relationship. The study highlights how these geophysical methods correlate with hydrological data, offering new insights into the dynamics of karstic landscapes and potential collapse risks. Conducted at two sites—one with a sinkhole and another with temporary lakes—the research underscores the importance of integrating multi-modal geophysical techniques to unravel complex infiltration mechanisms in heterogeneous karst environments.
Gastropods from upper Pliensbachian–Toarcian (Lower Jurassic) sediments of Causses Basin, southern France and their recovery after the early Toarcian anoxic event
A new gastropod species, Bathrotomaria kronzwilmesorum, was identified from Lower Jurassic sediments of the Causses Basin, southern France, revealing insights into post-anoxic event recovery. The study found that gastropod diversity peaked during the Bifrons and Aalensis zones, indicating brief periods of stable oxygen levels and favorable seabed conditions. However, diversity plummeted in the Variabilis–Pseudoradiosa zones, suggesting severe environmental instability that only allowed highly adaptive species to survive. The slow and discontinuous faunal recovery was attributed to the Causses Basin's geographic isolation, which restricted faunal exchange with western European seas, preventing faster colonization by more diverse Tethyan taxa. This research highlights the impact of physiographic factors on biodiversity resilience during ancient environmental crises.
Influence of submonthly air–sea coupling on heavy precipitation events in the Western Mediterranean basin
Submonthly air–sea coupling significantly influences heavy precipitation events (HPEs) in the Western Mediterranean, particularly in Valencia (Spain), the Cévennes (France), and Calabria (Italy). Using 24 years of simulations from two atmosphere–ocean coupled regional climate models (AORCMs), researchers identified a statistical link between HPE intensity and sea-surface temperature (SST) variations in these regions. The study found that low-level wind changes, driven by surface heat flux adjustments, enhance precipitation sensitivity to SST shifts. Notably, specific HPEs on 28 September 2012 (Valencia), 12 October 2012 (Valencia), and 25–26 October 2012 (Cévennes) were likely affected by this coupling mechanism. The findings underscore the importance of submonthly air–sea interactions in predicting extreme weather events, with implications for climate modeling and risk assessment.
L’éperon barré du Rocher du Causse, Claret, Hérault (VIe-Ve s. av. n. è.) : un enclos pastoral ?
Archaeological evidence from the Rocher du Causse, located in the Causses and Cévennes UNESCO World Heritage Site, suggests that a stone-walled enclosure built between the 6th and 5th centuries BCE may have functioned as a temporary pastoral relay point rather than a permanent settlement. The structure, featuring contiguous functional units and an open space likely used for livestock containment, aligns with Mediterranean transhumance practices involving seasonal vertical movement of herds. This interpretation is supported by its strategic location between plains and mountains and the absence of domestic habitation within the enclosure. The study combines topographical analysis with architectural observations to propose a novel function for this prehistoric site.
La question des échanges et des assemblages funéraires à travers le mobilier métallique de la nécropole protohistorique du Causse à Labruguière (Tarn)
Excavations at the protohistoric necropolis of Labruguière, part of the UNESCO-listed Causses and Cévennes Mediterranean agro-pastoral landscape, revealed 1030 cremation graves with distinct burial assemblages. Analysis of these graves, spanning 925–450 BCE, uncovered evidence of long-distance exchanges and cultural interactions. Specific grave goods, including likely imported items, provided insights into funerary practices and trade or cultural ties between the community and neighboring regions in western Languedoc and southwestern France. The study highlights how material culture can illuminate complex socio-economic and cultural dynamics within ancient Mediterranean landscapes.
Les forêts du pays cévenol, de la Préhistoire à la charte du parc national des Cévennes
A long-standing tension between local foresters and park managers persists despite efforts to reconcile their approaches. The study highlights that the productive potential of French forests, both public and private, is threatened not only in the Cévennes but also in other rural mountainous regions beyond the Mediterranean. This conclusion emerges from a historical analysis tracing the evolution of Cévennes' forests from the post-glacial period to the present, noting early grazing pressure, state-led reforestation efforts, and the establishment of the National Cévennes Park (PNC) in 1970. The research also documents the gradual acceptance of the PNC by local municipalities, with 110 adhering to its charter by 2015, while acknowledging ongoing challenges in generating revenue from predominantly private forests.
The radiative impact of desert dust on orographic rain in the Cévennes–Vivarais area: a case study from HyMeX
A significant dust plume from northern Africa, characterized by high aerosol optical depth, was observed to influence orographic rainfall in the Cévennes–Vivarais area during a 2012 HyMeX campaign. The study found that this dust induced localized heating of up to +3 K and increased convective available potential energy by up to +900 J kg⁻¹, yet its radiative impact on 24-hour rainfall accumulation was marginal. High-resolution simulations using the Meso-NH model, validated against extensive ground-based, airborne, and space-borne data, revealed that while dust altered atmospheric conditions, its transient nature in dynamic Mediterranean environments limited its effect on precipitation patterns.
A GPS network for tropospheric tomography in the framework of the Mediterranean hydrometeorological observatory Cévennes-Vivarais (southeastern France)
A GPS network deployed in southeastern France reveals strong correlations between tropospheric water vapor depletion and precipitation patterns, offering new insights into hydrometeorological processes. The study, conducted within the Mediterranean hydrometeorological observatory Cévennes-Vivarais (OHM-CV), utilized a combination of permanent and temporary GPS receivers to monitor precipitable water vapor (PWV) with high temporal resolution. By inverting data from a dense local network using tomographic techniques, researchers obtained 3-D fields of tropospheric water vapor content, which showed good alignment with precipitation fields derived from meteorological radar. This approach demonstrates the potential of GPS tomography for improving our understanding and prediction of rain events.
Dependence of radar quantitative precipitation estimation error on the rain intensity in the Cévennes region, France
Radar quantitative precipitation estimation (QPE) errors exhibit complex dependencies on rain intensity, space-time scales, and geographical sub-domains in the Cévennes region of France. The study found that while error bias varies significantly across these factors, the standard deviation of errors remains relatively homogeneous. Notably, the estimation standard deviation of reference rainfall matches that of radar-reference discrepancies, highlighting limitations in the accuracy of current raingauge networks for spatial scales ranging from 5 to 100 km². This insight underscores the need for improved reference data to enhance radar QPE reliability.
La difficile « naturalisation » du causse Méjean
Despite two decades of contractual biodiversity management in the Cévennes National Park, specifically on the causse Méjean, local shepherds have shown minimal engagement with conservation efforts. This disconnect stems from a technocratic approach to nature that fails to align with the lived experiences and practices of shepherds, while also perverting the intended principles of free interest representation through flawed contractual arrangements. The study highlights the fragility of current conservation strategies, marked by persistent conflicts between shepherds and park authorities, and underscores the need for more inclusive and adaptive governance models.
Phénomènes torrentiels et transferts sédimentaires autour du massif du Tanargue, de l’âge du fer au petit âge de glace (PAG) (Cévennes vivaraises, France)
A study of the Cévennes' Tanargue massif reveals that land-use changes between the late 18th and late 19th centuries significantly altered the sensitivity of slopes to erosion, leading to alternating phases of intense sediment production and periods of calm. By combining historical analysis with geomorphological methods, researchers mapped and dated gravel deposits to reconstruct landscape dynamics and assess the speed of bedload transfer during the Little Ice Age (PAG). This provides key chronological markers for interpreting erosion rhythms since 3000 BP, placing the PAG within a longer morphogenetic evolution. The findings highlight the profound impact of human activity on sediment flux in Mediterranean agro-pastoral landscapes.
Quel rôle joue le substrat mésolithique dans le processus de néolithisation des grands causses ? Étude de l'industrie lithique de Combe-Grèze (commune de la Cresse, Aveyron)
A reanalysis of the lithic industry from Combe-Grèze, a key site in the Grands Causses region, reveals nuanced techno-typological distinctions that challenge simplistic models of cultural transmission during the transition from Mesolithic to Neolithic. The study suggests that while local Mesolithic traditions may have influenced early Neolithic economies, they did not operate in isolation but rather engaged with broader Mediterranean cardial sphere dynamics. By reconstructing operational chains and comparing them to regional contexts, researchers propose a more complex interplay of autochthonous innovation, cultural borrowing, and peripheral adaptations than previously assumed.
The vertebrate fauna from the “stipite” layers of the Grands Causses (Middle Jurassic, France)
A unique Middle Jurassic vertebrate assemblage from the 'stipites' layers of the Grands Causses, France, reveals one of the few fossil records of this age combining terrestrial and marine influences. The study documents small-sized bones, teeth, and scales of sharks (Hybodus, Asteracanthus), bony fishes (Lepidotes, Pycnodontiformes, etc.), amphibians (Anura, Albanerpetontidae), and reptiles (Crocodylomorpha, Ornithischia, Theropoda). Despite limited taxonomic diversity, this assemblage stands out for its mixed paleoenvironmental signals, surpassing coeval formations in Western Europe—except those from the British Isles—in diversity. The research synthesizes findings from these Bathonian coals and transitional layers, offering insights into Middle Jurassic ecosystems.
When does higher spatial resolution rainfall information improve streamflow simulation? An evaluation using 3620 flood events
Higher-resolution rainfall data significantly improves streamflow simulation accuracy in regions with spatially variable precipitation, such as southern France's Cévennes and Mediterranean areas. A study using 3620 flood events across 181 French catchments found that semidistributed hydrological models outperformed lumped models when rainfall variability was high. In contrast, both model types performed equally well in western France, where precipitation is more uniform. The research utilized a 1 km, hourly resolution rainfall reanalysis and evaluated streamflow dynamics using split-sample tests, highlighting the importance of spatial rainfall representation for accurate hydrological modeling.
How Predictability of Feeding Patches Affects Home Range and Foraging Habitat Selection in Avian Social Scavengers?
Griffon vultures in the Grands Causses, France, demonstrate adaptability to both predictable and unpredictable feeding environments. Despite the availability of highly predictable feeding stations—where carcasses are concentrated or dropped by farmers—they continue to forage in open grasslands when conditions (e.g., food abundance, flight) are favorable, indicating retention of natural foraging behaviors. However, they strongly prefer feeding stations during periods of scarcity or adverse weather, suggesting these stations mitigate survival risks but may also expose vultures to hazards like poisoning. Light feeding stations, offering reduced competition and mimicking natural resource dispersion, emerge as effective conservation tools without fully replacing unpredictable foraging strategies.
L’aqueduc romain de Causses-et-Veyran (34) et son septuple siphon inversé
Recent archaeological discoveries challenge the long-held interpretation of the Roman piles at Causses-et-Veyran, suggesting they were not towers or trophies but part of a sophisticated hydraulic system. The findings propose that these structures belonged to a lead pressure pipe aqueduct, designed to cross a valley using the principle of communicating vessels. Given the terrain's topography, which precluded traditional inverted siphon dynamics or bridge construction, Roman engineers partitioned the conduit into six sections, installing 'piles-relais' as relay points. This innovative approach, akin to modern Ottoman soutèrazi systems, demonstrates advanced engineering solutions for overcoming geographical challenges in ancient infrastructure.
Modelling nesting site suitability in a population of reintroduced Eurasian black vultures Aegypius monachus in the Grands Causses, France
A population of reintroduced Eurasian black vultures (Aegypius monachus) in the Grands Causses, France, demonstrates that only 10 nest locations are needed to reliably model habitat suitability for nesting. The study found that these vultures prefer pine trees and steep slopes, consistent with natural populations across Europe. Despite the small founder population, projections indicate ample breeding habitat is available, suggesting habitat limitation is not a current constraint. This research provides a robust framework for modeling habitat suitability in reintroduction efforts and offers conservation strategies that balance ecological needs with socio-economic factors, such as reducing logging and human activities during critical breeding periods.
Regional estimation of catchment-scale soil properties by means of streamflow recession analysis for use in distributed hydrological models
A new indicator, the Drainable Storage Capacity Index (DSCI), reveals significant underestimation of soil storage capacities in existing databases for the Cévennes-Vivarais region. By comparing cumulative streamflow and precipitation, DSCI effectively identifies gaps in documented deep-weathered rock horizons—critical for water transfer and storage. The study also applies streamflow recession analysis to estimate water storage capacities and hydraulic conductivities, uncovering distinct hierarchies among geologies: hard crystalline rocks exhibit the thickest but least conductive deep soil layers, while sedimentary rocks and alluvium are thinner yet more conductive. These findings provide essential data for developing distributed hydrological models in the region, addressing a critical need for accurate soil property assessments beyond conventional agronomic databases.
1400 years of extreme precipitation patterns over the Mediterranean French Alps and possible forcing mechanisms
A 1400-year record of extreme precipitation patterns over the Mediterranean French Alps reveals distinct phases of flood frequency, with low activity during the Medieval Warm Period and increased intensity during the Little Ice Age. The study, based on sediment analysis from Lake Allos, identifies ~160 graded layers as flood deposits, corroborated by historical records. These events are linked to intense meso-scale precipitation, with no evidence of changes in erosion processes since the MWP. High-frequency oscillations in flood frequency correlate with solar activity and autumnal North Atlantic Oscillation (NAO) patterns. Additionally, flood events in Allos were out of phase with those in the Cévennes but in phase with eastern Spain, suggesting regional atmospheric circulation shifts over the northwestern Mediterranean.
Entre affection et aversion, le retour du loup en Cévennes comme problème public
The return of the wolf to the Cévennes region has sparked complex public sentiments ranging from affection to aversion. This study reveals that while wolves are often viewed as symbols of nature's reassertion and heritage conservation, they also provoke fear and conflict among local communities, particularly regarding livestock predation. The research employs qualitative methods, including interviews and ethnographic observations, to analyze how this duality shapes public discourse and policy debates. It highlights the need for balanced approaches that address both ecological restoration and socio-economic concerns in managing such cultural landscapes.
Flash flood forecasting in poorly gauged basins using neural networks: case study of the Gardon de Mialet basin (southern France)
A groundbreaking approach using neural networks demonstrates the feasibility of accurate flash flood forecasting in poorly gauged basins, such as the Gardon de Mialet basin in southern France. This method achieves reliable predictions up to two hours without relying on rainfall forecasts, leveraging existing discharge measurements from a feedforward model. Even when discharge gauges fail, a recurrent neural network model can maintain functionality. The study also reveals that these models are robust against uncertainties in rainfall data, with ensemble forecasting not significantly impacting accuracy. This innovation offers promising solutions for flood prediction in ungauged or poorly monitored basins, addressing critical gaps in our understanding of rainfall-discharge relationships in heterogeneous and steeply-sloped landscapes.
Heavy precipitation events in the Mediterranean: sensitivity to cloud physics parameterisation uncertainties
Ensemble predictions based on cloud physics parameterization uncertainties show variable effectiveness depending on the meteorological scenario, with multi-process perturbations offering greater potential at higher model resolutions. The study used the Meso-NH model to investigate heavy precipitation events in southeastern France, comparing two contrasting cases: one associated with a warm, moist flow over the Cévennes ridge and another involving a quasi-stationary meso-scale convective complex over the Rhone valley. While the former case demonstrated higher forecast skill and minimal sensitivity to microphysical perturbations, the latter showed that multi-process perturbations could modulate rainfall intensities more effectively than localization, particularly when model resolution was increased to 500 m. These findings highlight the importance of tailored ensemble strategies for improving predictions in data-scarce regions like the UNESCO-listed Causses and Cévennes landscape.
La contextualisation des recherches en environnement : une approche multiscalaire et multi-acteurs en Cévennes
Research on forest fire prevention and landscape management in the Cévennes, France, demonstrates how environmental studies become deeply embedded in their application contexts over time. A 13-year case study of the Rouvergue forest reaménagement revealed that scientific approaches must adapt to evolving societal needs and multi-actor dynamics. The findings highlight the necessity for transdisciplinary dialogue between researchers and stakeholders to effectively address complex landscape challenges, while also emphasizing the need for differentiated contextual frameworks in such collaborations.
Larzac : du refus local de l’extension du camp militaire au soutien à la « cause du causse » (1971-1981)
A decade-long resistance campaign (1971–1981) by Larzac farmers against the expansion of a military camp successfully mobilized diverse local and national support, culminating in political victory. This case study reveals how grassroots opposition to land development, combined with regional identity movements, can drive large-scale social and environmental outcomes. The research employs qualitative historical analysis, including archival records and oral testimonies, to trace the evolution of protest tactics, alliances, and media influence that sustained public engagement.
Les représentations de la « petite école rurale » des familles venues s’installer en Cévennes, et sa place dans leur rapport au territoire
Families relocating to remote rural areas in the Cévennes region of France highly value small rural schools as a means to foster their children's development, connection with nature, and social bonds within the community. While school was not the primary motivation for moving, parents—mostly urban migrants—prioritize an educational environment that emphasizes outdoor learning, village integration, and strong teacher-student relationships. This perspective often aligns with teachers who share similar values, creating a cohesive social dynamic around these schools. However, conflicts arise when traditional pedagogical approaches clash with the more progressive vision of education sought by families. The study highlights the role of small rural schools in shaping territorial identity and belonging for new residents.
Sensitivity of hydrological ensemble forecasts to different sources and temporal resolutions of probabilistic quantitative precipitation forecasts: flash flood case studies in the Cévennes‐Vivarais region (Southern France)
A study on the Cévennes-Vivarais region reveals that merging probabilistic quantitative precipitation forecasts (PQPF) from different sources and temporal resolutions significantly enhances flash flood discharge predictions. The research found that 6-hour ensemble prediction systems better capture rainfall dynamics compared to daily analogy-based PQPF, which tend to underestimate rainfall variability. By combining these data sources, the study demonstrated a substantial improvement in hydrological forecast performance, reducing the need for sophisticated hourly rainfall generators. This approach provides more accurate and reliable early warnings for flash floods in small to mid-sized catchments.
Structure et assemblage des communautés végétales de parcours des Grands Causses : approche fonctionnelle, phénologique et phylogénétique
A study of the vegetation communities on the Grands Causses, part of the UNESCO World Heritage Site 'The Causses and the Cévennes,' reveals complex patterns of species assembly driven by edaphic constraints. The research demonstrates that in less constrained, more productive environments, plant strategies converge to efficiently use resources, likely due to strong aerial competition, while reproductive strategies diverge. Conversely, intermediate constraints foster maximum functional diversity through coexisting resource management strategies. Phylogenetic convergence is prominent under less stressful conditions, dominated by graminoids, but diminishes in drier areas where diverse evolutionary lineages adapted to drought thrive. The study also highlights the role of phenology in community assembly, influenced by both abiotic seasonal pressures—such as early soil drought—and biotic interactions limiting flowering overlap in productive habitats. By integrating functional, phenological, and phylogenetic approaches, this work provides an integrative framework for understanding the intricate processes shaping these vegetation communities.
A Climatology of the Mesoscale Environment Associated with Heavily Precipitating Events over a Northwestern Mediterranean Area
Heavily precipitating events (HPEs) over the northwestern Mediterranean, particularly affecting regions like the Causses and Cévennes, are driven by common mesoscale features such as slowly evolving trough-ridge patterns and diffluent midlevel flow. These events, characterized by daily precipitation exceeding 150 mm during autumn, show that instability and moisture are transported toward the target area via a low-level jet (LLJ) originating from the Mediterranean Sea. Strong moisture convergence occurs within the left exit of the LLJ, with parameters peaking during the mature stage. Clockwise rotation of low-level winds is observed throughout the event's lifecycle. However, synoptic and mesoscale patterns vary significantly depending on the location of precipitation, with differences in LLJ direction (southeasterly to southwesterly), midlevel flow orientation, and stretching of high moisture and instability areas. Long-lasting HPEs are associated with more pronounced quasi-stationary trough-ridge patterns, higher CAPE values, wetter tropospheres, and faster LLJs. The study utilized a 5-year climatological approach based on 3D-Var mesoscale analyses to document these features across four subdomains: Languedoc-Roussillon, Cévennes-Vivarais, South Alps, and Corsica.
A staggered approach to flash flood forecasting – case study in the Cévennes region
A staggered approach to flash flood forecasting demonstrates the potential for complementary systems to provide decision makers with increasingly accurate information as events near, despite significant uncertainty in meteorological forecasts. The study, conducted within the IMPRINTS project and focusing on a 2008 flash flood event in the Cévennes region of France, combines methodologies from the European Flood Alert System (EFAS) for early European-scale indications with an adapted data-based mechanistic model (DBM) to forecast river levels up to 12 hours ahead. While uncertainty in meteorological forecasts affects outcomes, early-stage uncertain results remain valuable for raising preparedness and prompting timely actions.
A statistical downscaling to identify the large‐scale circulation patterns associated with heavy precipitation events over southern France
Heavy precipitation events (HPEs) over southern France are strongly linked to specific large-scale circulation patterns, particularly a deep upper-level low northwest of the region that induces a southerly flow. This study identifies four robust clusters of atmospheric conditions, with one cluster showing a 70% success rate in predicting HPEs when using synoptic-scale parameters alone. Further refinement reveals that moisture transport direction and intensity—south-southeasterly flows for Cévennes events and easterly winds with dual moisture streams for Languedoc-Roussillon events—are critical factors. The research combines ECMWF ERA-40 reanalysis data with local rain-gauge observations to statistically downscale and characterize these patterns, offering a tool for better HPE prediction in climate scenarios.
Le gisement mésolithique des fieux (Miers, lot) : une halte de chasse sur le causse de Gramat ?
A re-evaluation of the Mesolithic site at the Fieux cave (Miers, Lot) challenges the long-held assumption that it served primarily as a hunting stopover. Multidisciplinary analysis—integrating anthracology, archaeozoology, carpology, lithic technology, bone industry studies, and sedimentology—reveals a broader range of activities than expected for a transient hunting site. Evidence of on-site carcass processing and consumption suggests more complex functional roles, prompting a nuanced reinterpretation of this UNESCO World Heritage landscape's Mesolithic use.
Les stratégies de survie des minorités protestantes ou catholiques dans les Cévennes face à la communauté villageoise (vers 1560-1685)
Religious minorities in the Cévennes, whether Protestant or Catholic, developed adaptive survival strategies between 1560 and 1685 to navigate tensions within village communities and with local authorities. The study reveals that the presence of these minorities disrupted traditional social hierarchies, forcing both groups to employ subtle tactics—such as religious pluralism or strategic alliances—to maintain cohesion amid persecution. Teissonnière’s analysis draws on historical records and ecclesiastical documents to reconstruct these dynamics, offering insight into how marginalized faiths persisted in a region marked by conflict during the Reformation and Counter-Reformation periods.
Modelling interactions between biophysical and social systems: the example of vegetation dynamics in the Causse Méjean (France)
A pioneering interdisciplinary study on the Causse Méjean, part of France's UNESCO-listed Causses and Cévennes landscape, reveals how shrubland vegetation dynamics are shaped by complex interactions between biophysical and social systems. The research demonstrates that vegetation progression can be effectively modeled by harmonizing and analyzing heterogeneous spatio-temporal data—ranging from environmental conditions to historical land use practices and social representations. Using advanced statistical techniques like Principal Component Analysis (PCA) for vegetation description and canonical correlation analysis, the study identified key factors influencing shrubland expansion. This approach not only advances our understanding of agro-pastoral landscapes but also provides a framework for modeling similar systems worldwide, bridging gaps between ecological and socio-economic dimensions.
Structure spatio-temporelle des fortes précipitations : application à la région Cévennes Vivarais
A new regional Intensity-Duration-Frequency-Surface (IDFS) model has been developed to characterize extreme rainfall events in the Cévennes-Vivarais region, a UNESCO World Heritage Site known for its catastrophic flooding. This model identifies critical spatio-temporal scales and evaluates the performance of mesoscale meteorological models by analyzing three significant historical events. The approach leverages dynamic scaling techniques to extrapolate high-resolution rainfall data from lower-resolution measurements, addressing gaps in observational networks. By quantifying measurement uncertainties and exploring scale invariance properties, this study provides a robust framework for assessing flood risks in Mediterranean agro-pastoral landscapes.
The Cévennes‐Vivarais Mediterranean Hydrometeorological Observatory database
The Cévennes-Vivarais Mediterranean Hydrometeorological Observatory (CVMHO) has developed a comprehensive database to improve the understanding and prediction of flash floods, which are common and devastating in Mediterranean regions. Established in 2000, CVMHO employs long-term observation strategies—spanning over a decade—using both operational systems and specialized research instrumentation in the Cévennes-Vivarais region of France. The database, accessible via the SEVnOL interface on the CVMHO website, provides critically analyzed hydrometeorological products that support scientific research. This work addresses critical gaps in predicting extreme weather events by integrating detailed observational data, offering valuable insights for disaster risk management and climate science.
Wild Brown Trout Affected by Historical Mining in the Cévennes National Park, France
Historical mining and metallurgy in the Cévennes National Park, France, have left a lasting impact on wild brown trout populations. Sixty percent of trout at one site exceed EU maximum allowed cadmium or lead concentrations in foodstuffs, with metal levels in fish tissues reflecting sediment contamination. Lead isotope signatures confirm exposure to mining waste drainage, while developmental instability, measured through fluctuating asymmetry, correlates significantly with cadmium and lead concentrations, suggesting adverse effects on fish development. Despite the region's current low industrial activity, these findings highlight the need to consider historical mining heritage in long-term environmental management strategies.
Économie souterraine et guerre des gangs sur les Grands Causses à la fin du Néolithique
A hidden economy thrived beneath the karst landscapes of the Grands Causses during the late Neolithic, revealing sophisticated underground resource exploitation. This study identifies a network of subterranean activities—water sourcing, clay and calcite extraction—that sustained human populations despite geographical constraints. Geomorphological analysis demonstrates how these practices were adapted to local conditions, yet their cultural significance remains elusive due to the region's complex socio-cultural context. The research challenges traditional chronocultural frameworks by highlighting the dynamic interplay between subsistence needs and landscape use in a period marked by cultural diversity.
Environmental risk mapping of canine leishmaniasis in France
A spatial analysis of canine leishmaniasis (CanL) in France reveals two distinct eco-epidemiological patterns, each associated with specific environmental conditions and sandfly vectors. The first pattern is found in the Cévennes region of the southern Massif Central, characterized by moderate altitudes (200–1000 m), cooler winter temperatures (1.9°C average), high annual rainfall (1042 mm), and dense forest cover—conditions favorable for Phlebotomus ariasi. The second pattern occurs on the Mediterranean coastal plain, marked by warmer temperatures, lower rainfall, and less forest cover, aligning with the preferences of Phlebotomus perniciosus. Using niche modeling (Maxent) based on climate, land cover, and population density data, researchers generated France's first risk map for CanL, illustrating how environmental factors shape disease distribution. This ecological approach deepens understanding of CanL dynamics, offering insights into its maintenance and emergence in southern France.
Formes, acteurs et enjeux de la participation dans la genèse du Parc national des Cévennes (1950-1970)
The creation of the Cévennes National Park (1950–1970) challenges conventional narratives about environmental participation, revealing a complex, locally driven process that predates modern 'ecocitizen' engagement. Unlike the state-centric, authoritarian model often associated with post-war France, this landscape's genesis involved deep collaboration between local actors and policymakers, characterized by strong interpersonal connections and subjective governance dynamics. This study reexamines the period through a historical lens, demonstrating that participatory modes were more nuanced than previously assumed—balancing modernization with grassroots involvement.
Hommes et arbres du Causse Méjan
A collaborative study by historians, a geographer, and an ecologist reveals that the agricultural and pastoral practices on the Causse Méjan—a 350 km² Mediterranean limestone plateau—have shaped its landscape over five centuries. The research demonstrates how human activities, particularly land management techniques, have driven ecological processes leading to the colonization of woody plants. This interplay explains the distinct contrast between the 'bare causse' and the 'wooded causse,' offering insights into the long-term dynamics of Mediterranean agro-pastoral landscapes.
L’archéologie en milieu montagnard en Languedoc-Roussillon : études de cas en Cerdagne (Pyrénées-Orientales) et sur les causses lozériens (Lozère)
Archaeological practices and outcomes differ significantly between mountainous regions despite similar archaeological remains, as demonstrated by case studies from Cerdagne (Pyrénées-Orientales) and the Lozère causses. The study highlights how administrative procedures and fieldwork methods in Languedoc-Roussillon influence the interpretation of past landscapes, revealing disparities in data collection and analysis even when dealing with comparable material culture. This research underscores the importance of contextual factors in shaping archaeological narratives.
Une modélisation d'accompagnement pour la gestion combinée des systèmes d'élevage et des milieux boisés sur le Causse du Larzac
A collaborative agent-based modeling approach successfully integrated the management goals of farmers and forest conservationists on the Causse du Larzac, a UNESCO-listed Mediterranean agro-pastoral landscape. The model, co-developed with researchers and technicians, allowed the Société Civile des Terres du Larzac (SCTL) to evaluate scenarios for combined livestock systems and wooded environments, while also addressing farmers' needs for improved farm functioning. This study demonstrates how companion modeling can bridge gaps between agricultural practices and ecological objectives in culturally significant landscapes.
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