A5070405929- Geology and Paleoclimatology Research
- Archaeology and ancient environmental studies
- French Urban and Social Studies
- Archaeological and Geological Studies
- Pleistocene-Era Hominins and Archaeology
- Archaeological and Historical Studies
- Mediterranean and Iberian flora and fauna
- Agriculture and Rural Development Research
- Aeolian processes and effects
- Tree-ring climate responses
- Medieval Architecture and Archaeology
- African Botany and Ecology Studies
- Soil erosion and sediment transport
- Botany and Plant Ecology Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Land Use and Ecosystem Services
- Geological formations and processes
- Plant Ecology and Soil Science
- Maritime and Coastal Archaeology
- Lichen and fungal ecology
- Archaeology and Cultural Heritage
- Health, Medicine and Society
- Environmental and Cultural Studies in Latin America and Beyond
- Forest Ecology and Biodiversity Studies
- Fire effects on ecosystems
Géographie de l'environnement
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Géosciences Environnement Toulouse
2015-2024
Université Toulouse - Jean Jaurès
2014-2023
Université de Toulouse
1994-2023
Observatoire Midi-Pyrénées
2022
Institut d'écologie et des sciences de l'environnement de Paris
2021
Laboratoire de Géographie Physique
2014-2017
Centre National pour la Recherche Scientifique et Technique (CNRST)
2017
Université de Strasbourg
2014
Abstract. On the basis of a multi-proxy approach and strategy combining lacustrine marine records along north–south transect, data collected in central Mediterranean within framework collaborative project have led to reconstruction high-resolution well-dated palaeohydrological assessment their spatial temporal coherency. Contrasting patterns changes been evidenced Mediterranean: south (north) around 40° N latitude, middle part Holocene was characterised by lake-level maxima (minima), during...
Understanding social-ecological system dynamics is a major research priority for sustainable management of landscapes, ecosystems and resources. But the lack multi-decadal records represents an important gap in information that hinders development agenda. Without improved on long-term complex interactions between causal factors responses, it will be difficult to answer key questions about trends, rates change, tipping points, safe operating spaces pre-impact conditions. Where available...
Abstract Long-term time series have provided evidence that anthropogenic pressures can threaten lakes. Yet it remains unclear how and the extent to which lake biodiversity has changed during Anthropocene, in particular for microbes. Here, we used DNA preserved sediments compare modern micro-eukaryotic communities with those from end of 19th century, i.e., before acceleration human imprint on ecosystems. Our results obtained 48 lakes indicate drastic changes composition microbial communities,...
Reliable quantitative vegetation reconstructions for Europe during the Holocene are crucial to improving our understanding of landscape dynamics, making it possible assess past effects environmental variables and land-use change on ecosystems biodiversity, mitigating their in future. We present here most spatially extensive temporally continuous pollen-based plant cover (at a spatial resolution 1° × 1°) over (last 11.7 ka BP) using ‘Regional Estimates VEgetation Abundance from Large Sites’...
Modern pollen assemblages from grazed vegetation in the Pyrenees Mountains (France) were studied with aim of providing a calibrated model for reconstructing past pastoral activities. The modem analogues selected to cover major gradients grazing pressure and degree openness. was surveyed by means synusial integrated method, assessing structure patchiness phytoceonoses. A correlative (Redundancy analysis) devised relating 61 modern spectra 37 explanatory land-use variables. It shown that...
In this study archaeology, history and palaeoecology (modern fossil data sets of pollen non-pollen palynomorphs) were used to reconstruct small-scale pastoral activities in the Pyrenees Mountains during last two millennia. Modern assemblages from major vegetation units (both natural anthropogenic) are studied on one restricted watershed area. A correlative model (RDA) 61 modern spectra 35 external variables distinguishes groups taxa, providing information nature spatial extent human impact...
A lake-level record of Lake Ledro (northern Italy) spans the entire Holocene with a chronology derived from 51 radiocarbon dates. It is based on specific sedimentological approach that combines data five sediment profiles sampled in distinct locations littoral zone. On millennial scale, shows two successive periods 11,700 to 4500 cal yr BP and present, characterized by lower higher average lake levels, respectively. In addition key seasonal inter-hemispherical changes insolation, major...
Abstract To assess the effects of altitude on level and structure genetic diversity, a survey was conducted in 12 populations sessile oak ( Quercus petraea ) located between 130 1660 m two parallel valleys northern side Pyrenees Mountains. Genetic diversity monitored at 16 nuclear microsatellite loci 5 chloroplast DNA (cpDNA) markers. The cpDNA suggested that extant both shared same source from plain. There no visible trend along altitude, even if indirect estimates effective population...
Both quantitative reconstruction of fire frequency from charcoal counts and pollen analysis were undertaken on a 312 cm sediment core Gabarn peat bog. An 8000 yr cal. BP palaeofire record vegetation history established the basis nine 14 C (AMS) dates. As anthropogenic Inferred Fire Frequency (IFF) has seldom been studied, we test discuss two different methods calculation. Our results shows clear Holocene bipartition at c. 3500—4000 characterized by three times decrease in Mean Interval...
A multiproxy analysis of lacustrine sediments cored in Grand-Case Pond at Saint-Martin, north the Lesser Antilles archipelago, reveals three distinct climatic periods for last 3700 years. From to ~2500 yr cal. BP and from 1150 present, carbonate mud deposition occurred connection with pond lowstands. These were also punctuated by severe drought events, marked gypsum laminae, hurricane landfalls, leading marine sand inputs into pond. The intermediate time interval, 2500 BP, is typified black...
Ombrotrophic peatland-fed solely from atmospheric deposition of nutrients and precipitation-provide unique archives pollution have been used to illustrate trends changes in trace element composition the recent decadal Holocene period. With acknowledgment atmosphere plastic pollution, analysis ombrotrophic peat presents an opportunity characterize historical microplastic prevalence. peatland is often located comparatively pristine mountainous boreal areas, acting as sentinels environmental...
Located on a mountain pass in the west-central Pyrenees, Col d'Ech peat bog provides Holocene fire and vegetation record based upon nine 14 C (AMS) dates. We aim to compare climate-driven versus human-driven regimes terms of frequency, episodes distribution, impact vegetation. Our results show mid-Holocene (8500–5500 cal yr BP) be characterized by high frequency linked with drier warmer conditions. However, occurrences appear have been rather stochastic as underlined scattered chronological...
A lake-level record for the late Holocene at Lake Ledro (Trentino, northeastern Italy) is presented. It based on sediment and pollen analysis of a 1.75 m high stratigraphic section observed southern shore (site I) 3.2 long core taken from littoral mire southeastern II). The chronology derived 15 radiocarbon dates stratigraphy. late-Holocene composite established these two sequences gives evidence centennial-scale fluctuations with highstands c. 3400, 2600, 1700, 1200 400 cal. BP, in...
Abstract. Adding to the on-going debate regarding vegetation recolonisation (more particularly timing) in Europe and climate change since Lateglacial, this study investigates a long sediment core (LL081) from Lake Ledro (652 m a.s.l., southern Alps, Italy). Environmental changes were reconstructed using multiproxy analysis (pollen-based reconstruction, lake levels, magnetic susceptibility X-ray fluorescence (XRF) measurements) recorded land-use during Lateglacial early–middle Holocene. The...
Abstract Ciliates are unicellular heterotrophic organisms that play a key role in aquatic planktonic and benthic food webs. Advances sedimentary DNA (sed-DNA) analysis offer the possibility to integrate these bioindicators paleoenvironmental reconstructions. In this study, we used top–bottom paleolimnological approach metabarcoding techniques applied sed-DNA compare recent past (i.e. prior major anthropogenic impacts) ciliate communities of 48 lakes located along an elevation gradient. Our...
Abstract. On the basis of a multi-proxy approach and strategy combining lacustrine marine records along north–south transect, data collected in Central Mediterranean within framework collaborative project have led to reconstruction high-resolution well-dated palaeohydrological assessment their spatial temporal coherency. Contrasting patterns changes been evidenced Mediterranean: south (north) around 40° N latitude, middle part Holocene was characterised by lake-level maxima (minima), during...