A5035923473- Microbial Community Ecology and Physiology
- Geology and Paleoclimatology Research
- Maritime and Coastal Archaeology
- Environmental DNA in Biodiversity Studies
- Polar Research and Ecology
- Cryospheric studies and observations
- Marine and environmental studies
- Protist diversity and phylogeny
- Freshwater macroinvertebrate diversity and ecology
- Geological formations and processes
- Archaeology and ancient environmental studies
- Ancient Mediterranean Archaeology and History
- Karst Systems and Hydrogeology
- Climate change and permafrost
- Aeolian processes and effects
- Archaeological Research and Protection
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Water resources management and optimization
- Archaeological and Historical Studies
- Water Quality and Resources Studies
- Coastal and Marine Dynamics
- Tree-ring climate responses
- Pasture and Agricultural Systems
- Wastewater Treatment and Reuse
École Polytechnique Fédérale de Lausanne
2019-2025
Institut de physique du globe de Paris
2025
Aristotle University of Thessaloniki
2007-2018
Oregon State University
2004
The rapid melting of mountain glaciers and the vanishing their streams is emblematic climate change1,2. Glacier-fed (GFSs) are cold, oligotrophic unstable ecosystems in which life dominated by microbial biofilms2,3. However, current knowledge on GFS microbiome scarce4,5, precluding an understanding its response to glacier shrinkage. Here, leveraging metabarcoding metagenomics, we provide a comprehensive survey bacteria benthic across 152 GFSs draining Earth's major ranges. We find that...
In glacier-fed streams, ecological windows of opportunity allow complex microbial biofilms to develop and transiently form the basis food web, thereby controlling key ecosystem processes. Using metagenome-assembled genomes, we unravel strategies that seize this in an otherwise characterized by harsh environmental conditions. We observe a diverse microbiome spanning entire tree life including rich virome. Various co-existing energy acquisition pathways point niches exploitation available...
Abstract Most cryospheric ecosystems are energy limited. How their energetics will respond to climate change remains largely unknown. This is particularly true for glacier-fed streams, which interface with the cryosphere and initiate some of Earth’s largest river systems. Here, by studying resource stoichiometry microbial in 154 streams sampled Vanishing Glaciers project across major mountain ranges, we show that these benthic microbiome overall carbon phosphorus Threshold elemental ratios...
Abstract Glacier-fed streams (GFSs) are extreme and rapidly vanishing ecosystems, yet they harbor diverse microbial communities. Although our understanding of the GFS microbiome has recently increased, we do not know which clades ecologically successful in these nor understand potentially underlying mechanisms. Ecologically should be more prevalent across GFSs compared to other clades, reflected as clade-wise distinctly low phylogenetic turnover. However, methods assess such patterns...
Abstract. Glaciers worldwide are shrinking at an accelerated rate as the climate changes in response to anthropogenic influence. While increasing air temperature is main factor behind glacier mass and volume loss, variable patterns of precipitation distribution also play a role, though these not well understood. Furthermore, while surface glaciers (from large polar ice sheets small alpine glaciers) climatic documented continuously monitored, little nothing known about how cave (perennial...
Microbial life in glacier-fed streams (GFSs) is dominated by benthic biofilms which fulfill critical ecosystem processes. However, it remains unclear how the bacterial communities of these assemble stream ecosystems characterized rapid turnover habitats and high suspended sediment loads. Using16S rRNA gene amplicon sequence data collected from 54 GFSs across Himalayas, European Alps, Scandinavian Mountains, we found that harbor are distinct assemblages streamwater. Our showed a decrease...
The shrinking of glaciers is among the most iconic consequences climate change. Despite this, downstream for ecosystem processes and related microbiome structure function remain poorly understood. Here, using a space-for-time substitution approach across 101 glacier-fed streams (GFSs) from six major regions worldwide, we investigated how glacier shrinkage likely to impact organic matter (OM) decomposition rates benthic biofilms. To do measured activities five common extracellular enzymes...
The shrinkage of glaciers and the vanishing glacier-fed streams (GFSs) are emblematic climate change. However, forecasts how GFS microbiome structure function will change under projected scenarios lacking. Combining 2,333 prokaryotic metagenome-assembled genomes with climatic, glaciological, environmental data collected by Vanishing Glaciers project from 164 GFSs draining Earth's major mountain ranges, we here predict future until end century various scenarios. Our model framework is rooted...
This study investigates the possibility of Holocene glaciation on Mount Olympus (Greece) with a respective local temperature–precipitation equilibrium line altitude (TP-ELA) at c. 2200 m a.s.l., based geomorphologic and paleoclimatic evidence. At present, TP-ELA is situated above mountain’s summit ( 2918 a.s.l.), but permanent snowfields ice bodies survive within Megala Kazania cirque between 2400 2300 because cirque’s maritime setting that results from its close proximity 18 km) to Aegean...
Antimicrobial resistance (AMR) is a universal phenomenon the origins of which lay in natural ecological interactions such as competition within niches, and between micro- to higher-order organisms. To study these phenomena, it crucial examine AMR pristine environments, i.e., limited anthropogenic influences. In this context, epilithic biofilms residing glacier-fed streams (GFSs) are an excellent model system diverse, intra- inter-domain, crosstalk. We assessed resistomes from GFSs across...
Glacier-fed streams (GFSs) exhibit near-freezing temperatures, variable flows, and often high turbidities. Currently, the rapid shrinkage of mountain glaciers is altering delivery meltwater, solutes, particulate matter to GFSs, with unknown consequences for their ecology. Benthic biofilms dominate microbial life in play a major role biogeochemical cycling. Mineralization likely an important process microbes meet elemental budgets these systems due commonly oligotrophic conditions,...
Abstract Cone penetration testing has been widely used since the 1950s for determining subsurface geotechnical conditions of unconsolidated sediments. This paper highlights potential value cone as an aid to define stratigraphic structure Holocene sedimentary deposits. By calibrating test logs with adjacent borehole and by utilizing all available information produced during surveying, models that accurately describe vertical lateral boundaries, well stacking pattern, Late Quaternary systems...
During the Holocene, western part of present-day Thessaloniki coastal plain (north-central Greece) was flooded by rising sea level and formed a bay as consequence last postglacial transgression. The rate sealevel rise subsequently decelerated, this began to fill with sediments delivered Aliakmon Axios, well other smaller rivers. palaeogeographic palaeoenvironmental reconstruction Plain focus several studies published during past century. Most these are based on interpretation historical...
The glaciers on Africa's ‘Mountains of the Moon' (Rwenzori National Park, Uganda) are predicted to disappear within next decades owing climate change. Consequently, glacier-fed streams (GFSs) that drain them will vanish, along with their resident microbial communities. Despite relevance communities for performing ecosystem processes in equatorial GFSs, ecology remains understudied. Here, we show benthic microbiome from Mt. Stanley GFS is distinct at several levels other GFSs. Specifically,...
Abstract Nearly 60% of the world’s glaciers are predicted to be lost by end century because global warming1. The impacts this environmental change on glacier-fed stream (GFS) ecosystems profound, putting their ecological communities at risk 2–4 . Life in GFSs is dominated benthic microbial biofilms, which regulate key ecosystem processes and form basis food web 5 However, biodiversity biogeography biofilm microbiome remain unknown, precluding a mechanistic understanding its responses glacier...
Tillamook Bay on the northern Oregon coast has experienced significant sediment accumulation and shoaling. Analyses show that part of increased sedimentation was a result substantial human impacts in watersheds five rivers drain into bay. River discharges were enhanced by approximately 13% during period 1931–1954, when commercial logging series devastating forest fires occurred, compared with years after reforestation. Potential annual yields calculated from daily 29% but actual would have...
Abstract Runoff from rapidly melting mountain glaciers is a dominant source of riverine organic carbon in many high‐latitude and high‐elevation regions. Glacier dissolved highly bioavailable, its composition likely reflects internal (e.g., autotrophic production) external (i.e., atmospheric deposition) sources. However, the balance these sources across Earth's poorly understood, despite implications for mineralization assimilation glacier within recipient ecosystems. We assessed...
Abstract We present an integrated study of subsurface and surficial karst landforms to unravel the uplift history landscape in a tectonically‐active area. To this end, we apply multidisciplinary approach by combining cave geomorphology Th/U dating speleothems with remote sensing plus geophysical imaging surface landforms. use as example Mt. Menikio northern Greece where four caves share well‐defined epiphreatic/shallow phreatic characteristics that are related distribution buried doline...
Abstract The biogeochemistry of rapidly retreating Andean glaciers is poorly understood, and Ecuadorian glacier dissolved organic matter (DOM) composition unknown. This study examined molecular carbon isotopes DOM from supraglacial outflow streams ( n = 5 14, respectively) across five ice capped volcanoes in Ecuador. Compositional metrics were paired with streamwater isotope analyses (δ 18 O) to assess if was associated regional precipitation gradients thus an atmospheric origin DOM....
One of the prominent features northeast Mediterranean (NEM) Holocene climate are recurrent phases cold and aridity; their impacts on hydrological cycle remain at large unknown, as few existing paleohydrological records either restricted to lake-level fluctuations or focus near ‘8.2 kyr BP’ event. Here, we present detrital record Aliakmon River in Lake Loudias between 9500 3000 cal. BP. Magnetic susceptibility (MS) exhibits high correlation with mean grain size ( r = 0.7) silt-sized fractions...