A5052991582- Diatoms and Algae Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Geology and Paleoclimatology Research
- Building materials and conservation
- Freshwater macroinvertebrate diversity and ecology
- Paleontology and Stratigraphy of Fossils
- Soil erosion and sediment transport
- Aquatic Invertebrate Ecology and Behavior
- Hydrology and Sediment Transport Processes
- Cultural Heritage Materials Analysis
- 3D Surveying and Cultural Heritage
- Conservation Techniques and Studies
- Archaeological and Geological Studies
- Microbial Community Ecology and Physiology
- Mediterranean and Iberian flora and fauna
- Geological formations and processes
- Marine and coastal ecosystems
- Archaeological Research and Protection
- Semiconductor materials and devices
- Archaeology and ancient environmental studies
- Geological and Geophysical Studies Worldwide
- Cultural Heritage Management and Preservation
- African Botany and Ecology Studies
- Maritime and Coastal Archaeology
- Aeolian processes and effects
Laboratoire de Géographie Physique et Environnementale
2016-2025
Université Clermont Auvergne
2016-2025
Centre National de la Recherche Scientifique
2015-2025
Territoires
2022-2023
Maison des Sciences sociales et des Humanités Lorraine
2013
Maison des Sciences de l'Homme Lyon St-Étienne
2013
Université Paris-Sud
2002-2006
Laboratoire de Physique des Gaz et des Plasmas
2004-2005
ABSTRACT Riverine ecosystems are recurrently rejuvenated during destructive flood events and vegetation succession starts again. Poplars (i.e. species from Populus genera) respond to hydrogeomorphological constraints, but, in turn, also influence these processes. Thus, poplar development on bare mineral substrates is not exclusively a one‐way vegetative process. Reciprocal interactions adjustments between sediment dynamics their life cycle lead the emergence of biogeomorphological entities...
Throughout history, mineral springs have been utilized worldwide for various purposes. In the French Massif Central, numerous springs, such as CO2-rich Ceix Spring, historically significant. The spring was formerly used manufacture of statuettes by petrifying objects. December 2019, restored to create a natural area downstream point emergence (water catchment that remains confined within small, enclosed building), including formation spring-associated travertines. From January 2020 March...
During years 2021–2022, an unusual seismic swarm was recorded at crustal level beneath the Monts Dore volcanic province (France). Complementary field and remote measurements were performed. Together with time series on seismological GNSS national networks, these fundamental for monitoring evolution of deciphering its origin. Although a potential vertical migration events is suggested, complementary presumably discard hypothesis magma intrusion shallow level. The ascent CO 2 -rich fluid...
Abstract Populations of the riparian pioneer species Populus nigra L. which establish on alluvial bars within river channels modulate sediment dynamics and fluvial landforms. Dense cohorts P. have colonized gravel point along channelized River Garonne, France, during last 20 years enhanced vertical, lateral longitudinal development bars. For this period, geomorphic characteristics two wooded laterally stable are closely linked to spatial distribution intensity establishment resistance...
ABSTRACT Comparative assessment of stone weathering intensities and bioclimatic conditions was conducted at four temples located in cleared forested sites the Angkor Park, based on similar protocols. Four thousand sculpted lotus petals carved same grey sandstone were categorized by using two customized scales intensity, climate monitoring from December 2008 to November 2009. Whereas 70% are almost completely destroyed mechanical areas, 74% environments appear be totally free only affected...
Diatoms are good indicators of water quality because their great diversity and wide ecological range. They also interesting in assessing the impact radioactivity on ecosystems capacity to absorb radioelements. show radio-induced deformities, observed many species. In order assess more precisely natural radioactivity, diatom communities were monitored during a 9-month survey two mineral springs characterized by levels ranging within orders magnitude. The experimental data obtained analyzed...
Springs are abundant and present worldwide among the most threatened ecosystems on Earth. The main aim of this study was to evaluate biodiversity seventy-nine (79) mineral saline springs situated in French Massif Central, focusing species richness estimated also diatom community composition. influence physical chemical factors both communities analyzed order have a better knowledge ecological preferences identify typical springs. Since December 2014, an on-going inventory has been progress....
Nannoliths are heterogeneous morphological suites of biogenic carbonate particles with silt-clay size dimensions. They mainly composed coccoliths, a suite calcite complex structures produced by marine coccolithophores belonging to the Haptophyta microalgae division. Coccoliths can be found in and coastal facies, they used as palaeoenvironmental proxy tracer sediments. Among microscopic commonly observed tsunami deposits, diatoms often determine provenance sediment source, but very few...
During a floristic survey of freshwater springs in the French Massif Central region, new Sellaphora species (Bacillariophyceae) was found and is hereby described: labernardierei sp. nov. This small species, with linear to linear-elliptical valves, slightly inflated middle, formally described using light scanning electron microscopy. The has single H-shaped chloroplast striae usually biseriate tending be uniseriate near centre valve. valve dimensions, valve, pole central area shapes, density...
This study investigated and compared the diatom flora from thermo-mineral springs in Auvergne (France) Sardinia (Italy). Samples were collected rock/cobbles fine sediments 16 between January 2015 March 2017. A total of 207 taxa (59 genera) found. Multivariate analyses revealed significant differences species composition abundance among assemblages both within each geographic region (global R = 0.516; p 0.002), suggesting importance local climatic factors distribution. Based on common...
Light microscopy (LM) and scanning electron (SEM) observations on a new species of the genus Pseudostaurosira from spring Massif Central (France) are presented. The species, with very small dimensions, presents similarities other previously observed in parts Europe. However, based its morphology, striae sometimes composed only two areolae valvar surface: one big, round or elliptic near mantle edge second smaller, slit-like (sometimes completely occluded externally) situated further toward...
During a survey of some springs in the French Central Massif, new Navicula species (Bacillariophyceae) was found: sanctamargaritae Beauger sp. nov. A second observed during routine biomonitoring project Flanders: flandriae Van de Vijver & A.Mertens nov.. The are formally described using light and scanning electron microscopy. Both present unique set morphological characters including structure central raphe endings, striation pattern, valve dimensions outline, which allows their...
Polar regions are very sensitive to climate variability. Glacial environments, such as Spitsbergen, respond drastically warming by the disintegration of ice masses, release huge amounts free water and rapid evolution terrestrial landforms. Paraglacial studies have shown that sediment yield decreases with time following a relaxation curve. The study examines effects scaling on rhythms deglaciation fluxes in small catchment. It appears paraglacial sequence, known morphogenic crisis, could be...
A palaeoenvironmental study of a palaeochannel within the lower alluvial floodplain Allier River, France, has been carried out at high temporal resolution. Research was based upon multi-proxy approach using different sedimentological (magnetic susceptibility, sediment texture and loss on ignition) palaeoecological (pollen, non-pollen palynomorphs (NPPs), diatoms – indicators). The dated from six radiocarbon dates spans second to eleventh century AD. cultural landscape history this...
Abstract Dissolved organic matter (DOM) controls the degradation and sequestration of aquatic pollutants and, in turn, water quality. In particular, pollutant is performed by oxidant species that are generated exposure DOM to solar light, yet, since a very complex mixture poorly known substances, relationships between potential precursors their oxydative capacity known. Here, we hypothesized production could be predicted using fluorescence analysis. We analysed samples from an alluvial plain...