Michael Styllas

Michael Styllas
École Polytechnique Fédérale de Lausanne | EPFL · River Ecosystem laboratory (RIVER)

PhD Geology

About

42
Publications
18,224
Reads
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448
Citations
Citations since 2016
28 Research Items
289 Citations
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2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
Introduction
Early enough, I fell in love with the mountains and especially with Mount Olympus. Later on, I kept balancing between Geology and Oceanography to understand how water, sediments, dust and carbon move from Zeus to Poseidon, say from the glaciated summits to the ocean, as the mountains erode and humans do their best to alter natural landscapes and biogeochemical cycles. Along this line, I am challenged to seek solutions and support actions towards a sustainable future Earth.
Additional affiliations
November 2015 - July 2022
Independent Research Team
Position
  • Principal Investigator
Description
  • Research Project fuded by John Latsis Foundation. Title: "Did the Ancient Greek Gods Ever got Cold? Examining the Holocene glacial history of Mount Olympus, Greece"
July 2006 - September 2018
GEOSERVICE LTD
Position
  • Senior Researcher
Description
  • Applied geophysics, Artificial Recharge projects, Geotechnical projects
June 2006 - present
GEOSERVICE LTD
Position
  • Geologist
Description
  • Geological mapping, analysis and intepretation of geophysical transects (GPR, ERT, seismic profiles) for road, bridge and winde generator parks construction, EU funded research projects (GABARDINE, STONECORE, SUBSOL).
Education
September 2004 - September 2009
Aristotle University of Thessaloniki
Field of study
  • Geology / Sedimentology
March 1999 - October 2001
Oregon State University
Field of study
  • Oceanography
September 1994 - September 1998

Publications

Publications (42)
Article
Full-text available
In glacier-fed streams, ecological windows of opportunity allow complex microbial biofilms to develop and transiently form the basis of the food web, thereby controlling key ecosystem processes. Using metagenome-assembled genomes, we unravel strategies that allow biofilms to seize this opportunity in an ecosystem otherwise characterized by harsh en...
Article
Full-text available
The shrinking of glaciers is among the most iconic consequences of climate change. Despite this, the downstream consequences for ecosystem processes and related microbiome structure and function remain poorly understood. Here, using a space‐for‐time substitution approach across 101 glacier‐fed streams (GFSs) from six major regions worldwide, we inv...
Article
In this study, we present a new glacial chronology based on 20 in situ-produced 36Cl-based cosmic ray exposure datings from moraine boulders and bedrock from the Throne of Zeus (TZ) and Megala Kazania (MK) cirques on Mount Olympus. The 36Cl derived ages of glacial landforms range from 15.6 ± 2.0 to 0.64 ± 0.08 ka, spanning the Late-glacial and the...
Article
Full-text available
One of the prominent features of northeast Mediterranean (NEM) Holocene climate are recurrent phases of cold and aridity; their impacts on the hydrological cycle remain at large unknown, as few existing paleohydrological records are either restricted to lake-level fluctuations or focus near the ‘8.2 kyr BP’ event. Here, we present the detrital reco...
Article
Full-text available
The Holocene glaciations in the majority of Eastern Mediterranean mountains are generally obscured, as warm climate and their relatively low elevations prohibited the formation of glacial ice and discernible glacial landforms. This work reviews the Holocene glacial phases on Mount Olympus, emphasizes the relative roles of external forcing and of th...
Conference Paper
Full-text available
We present new evidence that explains the speleogenetic setting under which the formation of caves in a high porosity host rock has been taking place. These caves are forming inside partially consolidated carbonate conglomerate that comprises an extensive lithified alluvial fan field in the foothills of Mount Olympus in Greece. We perform macro-mor...
Article
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 biofilms assemble in stream ecosystems characterized by rapid turnover of benthic habitats and high suspended sediment loads. Using16S rRNA gene amplicon sequenc...
Preprint
Full-text available
Background Antimicrobial resistance (AMR) is a universal phenomenon whose origins lay in natural ecological interactions such as competition within niches, within and between micro- to higher-order organisms. However, the ecological and evolutionary processes shaping AMR need to be better understood in view of better antimicrobial stewardship. Reso...
Preprint
Between the southern margin of the European loess belt and Sahara Desert, thin and irregularly distributed loess deposits occur in Mediterranean mountains. During the most recent deglaciation, along the Pleistocene-Holocene boundary, the deposition of glacial, periglacial and outwash sediments, was the main local source of Mediterranean alpine loes...
Preprint
Full-text available
Microorganisms dominate life in cryospheric ecosystems. In glacier-fed streams (GFSs), ecological windows of opportunities allow complex microbial biofilms to develop and transiently form the basis of the food web, thereby controlling key ecosystem processes. Here, using high-resolution metagenomics, we unravel strategies that allow biofilms to sei...
Article
Full-text available
Glacier-fed streams (GFSs) are extreme and rapidly vanishing ecosystems, and yet they harbor diverse microbial communities. Although our understanding of the GFS microbiome has recently increased, we do not know which microbial clades are ecologically successful in these ecosystems, nor do we understand potentially underlying mechanisms. Ecological...
Article
Full-text available
Glaciers worldwide are shrinking at an accelerated rate as the climate changes in response to anthropogenic influence. While increasing air temperature is the main factor behind glacier mass and volume loss, variable patterns of precipitation distribution also play a role, though these are not as well understood. Furthermore, while the response of...
Preprint
Full-text available
Microdiversity, the organization of microorganisms into groups with closely related but ecologically different sub-types, is widespread and represents an important linchpin between microbial ecology and evolution. However, the drivers of microdiversification remain largely unknown. Here we show that selection promotes microdiversity in the microbio...
Article
Full-text available
Glacier-fed streams (GFSs) exhibit near-freezing temperatures, variable flows, and often high turbidities. Currently, the rapid shrinkage of mountain glaciers is altering the delivery of meltwater, solutes, and particulate matter to GFSs, with unknown consequences for their ecology. Benthic biofilms dominate microbial life in GFSs, and play a major...
Preprint
Full-text available
Glaciers worldwide are shrinking at an accelerated rate as the climate changes in response to anthropogenic influence. While increasing air temperature is the main factor behind glacier mass loss, changing atmospheric circulation 20 patterns and the distribution of precipitation also plays a role, though these are not as well understood. Furthermor...
Article
Full-text available
We present an integrated study of subsurface and surficial karst landforms to unravel the uplift history of karst landscape in a tectonically‐active area. To this end, we apply a multidisciplinary approach by combining cave geomorphology and Th/U dating of speleothems with remote sensing plus geophysical imaging of surface landforms. We use as an e...
Article
Full-text available
The relationship between the winter (DJFM) precipitation and the atmospheric circulation patterns is examined around Mount Olympus, Greece in order to assess the effects of orography and atmospheric dynamics over a small (less than 100 x 100 km) spatial domain. Winter accumulated rainfall datasets from 8 stations spread along the eastern (marine) a...
Article
Full-text available
Analyses of sea level records within the Caldera of Santorini Island revealed the significance of both océanographie and atmospheric forcing on the observed signals. Sea level (msl) and sea surface temperature (sst) data were obtained from the four stations of the REMOS monitoring network. Out of the four stations Gialos station is located on the c...
Article
Full-text available
Mediterranean Temporary Ponds (MTPs) are unique and sensitive aquatic ecosystems that due to their hydrological characteristics constitute an ideal setting for the study of past environmental dynamics. A 176 cm core was retrieved from the littoral zone of Omalos MTP in Lefka Ori massif, to provide a general view of the processes that drove its Late...
Poster
Full-text available
In the broader context of rapid environmental and climatic changes in the Mediterranean region, a new 36 Cl nuclide glacial chronology from two small (0.5km 2) cirques on Mount Olympus in Greece (Throne of Zeus and Megala Kazania) is presented, spanning the Lateglacial and the Holocene. The new chronology contemplates few existing Surface Exposure...
Chapter
Full-text available
In this chapter, we present four high-altitude (>1500 m) ice caves from Greece; (a) the Chionotrypa cave on Falakro Mountain, (b) the Chionotrypa cave on Mount Olympus, (c) the Provatina cave on Tymfi Mountain and (d) the Skud cave on Lefka Ori mountain range at the western Crete. These caves are developed vertically and preserve thick ice deposits...
Chapter
Full-text available
The Aliakmon River flows down from the northwestern mountains of Greece and is one of the largest fluvial systems in the Greek territory. Basin climate and geology favour the high rates of sediment production and transport and, consequently, the formation of an extensive (9.2% of basin area) bird-foot Holocene delta. Three phases (A, B and C) of hu...
Article
Full-text available
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 on geomorphologic and paleoclimatic evidence. At present, the local TP-ELA is situated above the mountain’s summit (c. 2918 m a.s.l.), but permanent...
Article
Full-text available
Cone penetration testing has been widely used since the 1950s for determining the subsurface geotechnical conditions of unconsolidated sediments. This paper highlights the potential value of cone penetration testing as an aid to define the stratigraphic structure of Holocene sedimentary deposits. By calibrating cone penetration test logs with adjac...
Article
The aim of this paper is to show the interest, in a place such as the Thessaloniki Plain, to combine the geomorphological study and the palaeoenvironmental approach in order to solve questions of historical geography. The careful scrutiny of literary sources indicates a fast stranding of a shallow marine cove it doesn't allow reconstructing precise...
Article
During the Holocene, the western part of the present-day Thessaloniki coastal plain (north-central Greece) was flooded by the rising sea level and formed a bay as a consequence of the last postglacial transgression. The rate of the sealevel rise subsequently decelerated, and this bay began to fill with sediments delivered by the Aliakmon and Axios,...
Article
Full-text available
The study aims to estimate the relative contributions of the two drainage basins of the Aliakmon and Axios rivers which, since the Mid-Holocene, have been responsible for building the largest deltaic area in Greece. Sediments from five cores located in the central part of the Thessaloniki Plain have been studied for their environmental changes usin...
Article
The plain of Thessaloniki is an important area from a historical standpoint. Numerous reigns and empires have occupied the area, leaving behind numerous archaeological remains. The literature and historical evidences show that the city of Pella was located near the sea and its harbor was the starting point of various conquests of famous kings such...
Article
Full-text available
Tillamook Bay on the Oregon coast is filled with sediment to the extent that at low tide more than half of its area consists of tidal flats. Typical of drowned-river estuaries formed by the rise in sea level at the end of the Ice Age, some of this sediment accumulation can be attributed to the natural processes of sand transported down the rivers o...
Article
Full-text available
Tillamook Bay on the northern Oregon coast has experienced significant sediment accumulation and shoaling. Analyses show that part of the increased sedimentation was a result of substantial human impacts in the watersheds of the five rivers that drain into the bay. River discharges were enhanced by approximately 13% during the period 1931-1954, whe...
Conference Paper
Full-text available
River Nestos has been affected by anthropogenic influence since 1952 when the riverbed in the deltaic region had been canalized and the river since then is discharging by one mouth to the North Aegean Sea. Recently two, out of three initially planed, cascading reservoirs has been constructed be the Public Power Corporation (DEI) in the northern Gre...
Article
Full-text available
Analyses of sea level records within the Caldera of Santorini Island revealed the significance of both oceanographic and atmospheric forcing on the observed signals. Sea level (msl) and sea surface temperature (sst) data were obtained from the four stations of the REMOS monitoring network. Out of the four stations Gialos station is located on the c...

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Projects

Projects (5)
Project
There is increasing evidence that accelerated warming leads to rapid changes in the dynamics of large-scale atmospheric circulation, with associated changes in the activity of storms. Understanding the mechanisms behind these changes requires analyses of the processes on time scales longer than those offered by instrumental observation, i.e, study of proxy-based climate reconstructions. In SE Europe, competing and/or mutually reinforcing large-scale modes of climate variability lead to complex climatic conditions, whose dynamics in the past is yet poorly understood. Particularly lacking are reconstructions of past wind direction and storminess along the eastern European seas. In this context, the aim of this project is to offer a reconstruction of winter climatic conditions and atmospheric circulation patterns across SE Europe during the mid-to-Late Holocene. By analyzing the stable isotope composition and geochemistry of cave ice and speleothems and the sedimentology and geochemistry of coastal marshes, we aim to provide 11) time series and maps of the spatial patterns of winter climate variability in SE Europe, covering the last 5000 years; 2) maps of the dominant wind directions with a similar temporal and spatial coverage; 3) mechanisms linking large-scale atmospheric circulation patterns to external forcing and internal dynamic during periods of both slow and rapid climatic changes.
Project
Characterize and decipher survival mechanisms in biofilms from high alpine glacier-fed streams using multi-omics