Maria Triantaphyllou

National and Kapodistrian University of Athens | uoa · Faculty of Geology and Geoenviromment

This study investigates the composition, abundance, and vertical export of polycyclic aromatic hydrocarbons (PAHs) across three deep basins of the northeastern Mediterranean Sea (NEMS) over one year. Sinking particles were collected using sediment traps, and PAH analysis was conducted via gas chromatography-mass spectrometry. PAH fluxes varied sign...

This study investigates the intricate dynamics of siliceous plankton species within the open marine regions of the Greek Seas, focusing on their seasonal and spatial variability. For this purpose, vertical export fluxes of diatoms (DtF), silicoflagellates (SF), and radiolaria (RF) were analyzed in three sediment trap time series obtained from the N...

Oral presentation

The Island of Rhodes, located in the Eastern Mediterranean Sea, is affected by an active convergent plate boundary. In this context, marine sediments of Plio-Pleistocene age have been uplifted and are outcropping along the eastern coast of Rhodes. These archives provide an excellent opportunity to unravel the hydrological and climatic changes of th...

This paper presents an initial study of teachers’ perspectives and practices on students’ assessment methods regarding the subject of Geology-Geography taught in junior secondary education in Greece. While the application of descriptive assessment is recorded in other European countries, the main focus of the research is the current situation in Gr...

Citation: Kontakiotis, G.; Antonarakou, A.; Besiou, E.; Skampa, E.; Triantaphyllou, M.V. Towards an Integrated and Accurate Planktonic-Foraminiferal-Deduced Bio-Chrono-Stratigraphic Framework of Late Quaternary Mediterranean Marine Cores. Abstract: The late Quaternary is a key stratigraphic interval as it encompasses the Late Glacial to Holocene tr...

Coccolithophores are an important component of phytoplankton abundance and biomass in the brackish environments of the Black Sea. Here, the abundance, composition, and distribution of coccolithophores were investigated in water samples taken from the first 50 m at 18 stations in the western Black Sea during a coccolithophore bloom, in June 2016. Th...

Alterations in composition and carbon biomass of phytoplankton community are closely related to seasonal variations, anthropogenic inputs and ultimately climatic changes in a longer perspective. Accuracy of the collected data is important to determine changes occurring in phytoplankton community composition. An intercomparison exercise of haptophyt...

The island of Rhodes in the eastern Mediterranean Sea is situated in an area affected by an ongoing plate convergence, and its Pleistocene marine environments were influenced by recurring hypoxia and changes in organic matter fluxes. This makes the island an important site to study the influence of orbital-driven climate changes and tectonic-induce...

Due to the lack of deep wells in the broader region, the mud volcanic deposits (mud breccia) are the only source of direct information for the deep stratigraphic units of the Mediterranean Ridge (MR), in the eastern Mediterranean. The study of this material, combined with the available seismic data, can improve the geological understanding of this...

Paleogene sedimentary deposits are exposed in several localities along the extended Thrace Basin in the Greek territory. One of the best sites in terms of preservation, richness and type of sediment occurs along the coastline of Fanari village (SW ofKomotini city). Two outcrops, which consist of upper Eocene shallowmarine clastic sediments, were sa...

High-resolution data for planktonic foraminifera and their groups of ecological interest, including Herbivores and Carnivores, combined with benthic foraminifera and a great variety of biogeochemical indices from the SE Aegean sediment core ST5, contribute to a detailed study concerning major and minor climatic episodes during Holocene. The ST5 sed...

Corfu Island (Greece) is located in the northern Ionian Sea and exhibits unique and diverse marine coastal habitats suitable for high-diversity assemblages such as shallow-water foraminifera. The island also lies near the current range expansion front of the invasive species Amphistegina lobifera. We analyzed the foraminiferal assemblages of 51 sam...

The geosites of Lemnos represent local touristic products that, beyond their high aesthetic value, display significant scientific links to the geological past as well as prehistory and history, archaeology, mythology and religious heritage of the island. The unique wealth of Lemnos geosites in combination with the abundance of archaeological sites,...

To enrich spatio-temporal information on the distribution of alien, cryptogenic, and neonative species in the Mediterranean and the Black Sea, a collective effort by 173 marine scientists was made to provide unpublished records and make them open access to the scientific community. Through this effort, we collected and harmonized a dataset of 12,64...

This study is the first attempt to understand the coccolith flux and its seasonal variability at the deepest part of the Mediterranean Sea. Samples were obtained from the deepest Mediterranean time-series sediment trap (4300 m) moored in the SE Ionian Sea (Nestor site) from January 2015 to November 2017. Throughout the study period, the coccolith f...

The MagellanPlus workshop "BlackGate" addressed fundamental questions concerning the dynamic evolution of the Mediterranean-Black Sea (MBS) gateway and its palaeoenvironmental consequences. This gateway drives the Miocene-Quaternary circulation patterns in the Black Sea and governs its present status as the world's largest example of marine anoxia....

Alkyonides Bay comprises a relative shallow (~ 370 m depth) semi-enclosed basin in the eastern Gulf of Corinth that was formed during the Pleistocene. The transition to modern marine conditions is recorded at around 12 ka BP, linked to the Holocene marine transgression, while tectonic activity and sea level changes control the sedimentation in the...

Biological invasions have become a defining feature of marine Mediterranean ecosystems with significant impacts on biodiversity, ecosystem services, and human health. We systematically reviewed the current knowledge on the impacts of marine biological invasions in the Mediterranean Sea. We screened relevant literature and applied a standardised fra...

This study is the first attempt to understand the coccolith flux and its seasonal variability at one of the deepest parts of the Mediterranean located in the SE Ionian Sea. The study area has complicated morphology comprised of valleys, steep slopes, and deep basins. Sediments for the microscopic analysis were obtained from the deepest time-series...

This study presents the preliminary results of selected samples from Aggelokastro section, NE Peloponnese, Greece. The section is comprised of a ~200 m thick carbonate sedimentary succession, followed by a ~10 m of thin bedded siliceous deposits, capped by ~50 m of clastic sediments of the “schist-sandstone-chert” formation and finally overthrusted...

Shallow-water banks of foraminiferal propagules (tiny juveniles <63 µm) harbor a hidden assemblage composition that has altered our understanding of traditional distribution patterns. Propagules can be transported well beyond their environmental limits and remain dormant until local conditions become suitable. Therefore, the composition of propagul...

The Saronikos Gulf, including the industrial zone of Elefsis Bay, is subjected to a variety of urban and industrial impacts that significantly contribute to environmental degradation. Benthic foraminifera comprise a significant component of meiobenthic communities and they are widely used as reliable indicators for the determination of the natural...

The presence and diversity of polycystine radiolarians in the North-Eastern Mediterranean Sea is explored for the first time through the analysis of sinking particles obtained from sediment traps moored in three open marine sites. In total, thirty species are identified for which we provide appropriate references and illustrations to clarify the sp...

Geological heritage or geoheritage refers to the total of geosites, i.e., areas of high geological interest in a given area. Geosites have a high potential of attracting geotourists, thus contributing to the development of the local economy. Assessing sites of geological interest can contribute to their promotion, as well as their preservation and...

Summary This project attempts to extract information regarding the stratigraphy and source rock potential of the deeply buried deposits in the Mediterranean Ridge (South of Crete marine region). Due to the lack of deep wells in the region, the only avaliable material comes from mud volcanic (mud breccia) samples recovered from various scientific ex...

The internal variability of the thermohaline circulation of the Mediterranean Sea is examined under contrasting extreme thermal and mass atmospheric forcing conditions. Three millennium-long numerical simulation experiments were performed under: (a) the current climatology, (b) a strong buoyancy forcing (SBF) scenario due to cold and dry conditions...

Phytoplankton community was investigated during two contrasting periods using offshore plankton samples in the volcanic area of Methana peninsula (Saronikos Gulf): the first at early autumn (warm period, September 2016) and the second one at early spring (cold period, March 2017). In order to investigate the phytoplankton community structure in the...

Thorough faunal (benthic foraminifera, ostracods, molluscs) and palynomorph analyses as well as magnetic susceptibility measurements performed on the Piraeus coastal plain sedimentary sequences have shed light on the paleoenvironmental evolution of the area since ca. 9000 cal BP. Benthic and palynomorph assemblages along with magnetic susceptibilit...

Coastal landscapes are sensitive to changes due to the interplay between surface and submarine geological processes, climate variability, and relative sea level fluctuations. The sedimentary archives of such marginal areas record in detail the complex evolution of the paleoenvironment and the diachronic biota response. The Elefsis Bay is nowadays a...

This study presents the results derived from micropaleontological and organic geo-chemical analyses of mud breccia samples obtained (through gravity coring) from five mud volcanoes (Gelendzhik, Heraklion, Moscow, Milano, Leipzig) located at the Olimpi mud volcano field on the Mediterranean Ridge accretionary complex. A thorough calcareous nannofoss...

Benthic foraminifera are important indicators for ecological studies. The assemblage composition of local communities can be used to analyze influences of environmental variables such as temperature, salinity, pH, and others. In recent years, the experimental propagule method has emerged as an effective tool to evaluate the influence of these varia...

Larger Benthic Foraminifera (LBF) from five localities in Greece were studied in order to define the morphological features of various nummulitid forms and to describe the foraminiferal assemblages in different geotectonic environments. The selected sites belong to molasse-type formations in Kirki/Thrace Basin and Vasiliki Trikala/Mesohellenic Trou...

The current Special Issue of Revue de Micropaleontologie, entitled “Updating Micropaleontology and Stratigraphy in Greece and Eastern Mediterranean” includes contributions from the T1S1 special Session [conveners Maria Triantaphyllou (NKUA), Dimitris Kostopoulos (AUTH), George Iliopoulos (UPAT)] organized by the Hellenic Committee for Paleontology...

Calcifying organisms such as benthic foraminifera are susceptible to changes in ocean pH and alkalinity. Responses to these changes include variations in mortality, calcification rates or assemblage composition, which have been observed in field and experimental studies. Here we applied a growth experiment with benthic foraminiferal propagules unde...

We gathered total organic carbon (%) and relative abundances of benthic foraminifera in intertidal areas and transitional waters from the English Channel/European Atlantic Coast (587 samples) and the Mediterranean Sea (301 samples) regions from published and unpublished datasets. This database allowed to calculate total organic carbon optimum and t...

Sr isotopes are a powerful tool used for provenancing in many disciplines, but their successful application requires the availability of robust Sr baselines of potential target areas. This study presents ⁸⁷Sr/⁸⁶Sr signatures and Sr concentrations of water, plants and soil leachates from the Peloponnese peninsula, Greece, to establish the first comp...

Coastal landscapes are sensitive to changes due to the interplay between surface and submarine geological processes, climate variability and relative sea level fluctuations. The sedimentary archives of such marginal areas record in detail the complex evolution of the paleoenvironment and the diachronic biota response. The Elefsis Bay is nowadays a...

Thorough analyses of benthic foraminifera, ostracods, molluscs, pollen and non-pollen palynomorphs as well as magnetic susceptibility measurements in the Piraeus coastal plain deposits shed light on the palaeoenvironmental evolution of the area during the Holocene. The main factors that feature the evolution of the Piraeus coastal landscape have be...

The multi-proxy investigation of the deep-marine Kottafi Hill section (KHS), a part of the carbonate system of the Miocene Pakhna Formation, Cyprus, involving such proxies as calcareous nannofossil analysis, measurements of the oxygen and carbon isotope composition of the planktonic foraminifer Orbulina universa, and determination of the pollen and...

he current study performs a detailed micropalaeontological analysis, in terms of ostracods, benthic foraminifera and calcareous nannoplankton, in order to reconstruct the palaeoenvironmental history of the sedimentary sequence exposed in the central part of Corinth Isthmus. Twenty one samples from two lateral sections were studied, on both sides of...

15 th International Congress of the Geological Society of Greece Athens, 22-24 May, 2019 | Harokopio University of Athens, Greece Bulletin of the Geological Society of Greece, Sp. Pub. 7 Ext. Abs. GSG2019-358

This work contributes to the ongoing work aiming at confirming benthic foraminifera as a biological quality element. In this study, benthic foraminifera from intertidal and transitional waters from the English Channel/ European Atlantic coast and the Mediterranean Sea were assigned to five ecological groups using the weighted-averaging optimum with...

Variations in ocean pH in shallow-water environments have implications on calcifying organisms. These include increased mortality, decalcification, or shifts in community composition. Previous works included field and laboratory studies on single species or entire assemblages. Here, we applied pH variations on a foraminiferal propagule bank to gath...

Methana volcanic area is situated at the southwest part of Saronic Gulf and at the eastern edge of the Aegean Volcanic arc. Near the coast, human activity (fish farming and tourism) has resulted in an increase in nutrients, mainly nitrates and phosphates, which are associated with the phenomenon of eutrophication. Within a distance from the shore,...

Coccolithophores are globally important marine calcifying phytoplankton. They contribute to the organic carbon pump through the primary production and the ballast of organic matter, and to the carbonate pump through the production of calcium carbonate. Here we compiled all available scanning electron microscopy (SEM) coccolithophore abundance obser...