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The island of Lesvos serves as a symbol of migration in the Mediterranean. From 2015 onwards, a steady stream of volunteer tourists began working on the island. Between 2019 and 2022 various 'crises' such as the Covid-19 pandemic, the fire at the Moria camp, and the rise of the far right in Greece significantly altered living conditions for both refugees and volunteer workers on the island. The authors employ a comparative patchwork autoethnography to rethink participant observation to fit the pandemic era. Through a situated, relational, and more-than-representational analysis of autoethnographic material and the confrontation between the authors' experiences, the aim of this paper is to investigate how migrant support volunteer tourism interacts with various simultaneous 'crises' ongoing on Lesvos. This led to a reimagining of the way we understand volunteer tourism over its 'pro vulnerable' approach. [ABSTRACT FROM AUTHOR]

The occurrence of flash floods in urban catchments within the Mediterranean climate zone has witnessed a substantial rise due to climate change, underscoring the urgent need for early-warning systems. This paper examines the implementation of an early flood monitoring and forecasting system (EMFS) to predict the critical overflow level of a small urban stream on Lesvos Island, Greece, which has a history of severe flash flood incidents requiring rapid response. The system is supported by a network of telemetric stations that measure meteorological and hydrometric parameters in real time, with a time step accuracy of 15 min. The collected data are fed into the physical Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS), which simulates the stream's discharge. Considering the HEC-HMS's estimated outflow and other hydro-meteorological parameters, the EMFS uses long short-term memory (LSTM) neural networks to enhance the accuracy of flood prediction. In particular, LSTMs are employed to analyze the real-time data from the telemetric stations and make multi-step predictions of the critical water level. Hydrological time series data are utilized to train and validate the LSTM models for short-term leading times of 15 min, 30 min, 45 min, and 1 h. By combining the predictions obtained by the HEC-HMS with those of the LSTMs, the EMFS can produce accurate flood forecasts. The results indicate that the proposed methodology yields trustworthy behavior in enhancing the overall resilience of the area against flash floods. [ABSTRACT FROM AUTHOR]

The study area of Rodafnidia on the island of Lesbos (Greece) is considered of archaeological interest, as Paleolithic stone tools have been recovered through excavation and collected from the ground surface in recent years. Geologically, the area is mostly covered by Quaternary post-alpine deposits and volcanic rocks. This paper presents the application of a local geophysical survey to determine the volume of the upper Quaternary deposits in which the Paleolithic artefacts can be found and the identification of their ignimbrite substrates. For this reason, the geoelectrical method was selected as the most appropriate for determining the lithostratigraphic subsurface layers. More specifically, a grid of twenty-one (21) Vertical Electrical Soundings (VES) along with an Electrical Resistivity Tomography (ERT) was carried out. The interpretation of the results of these surveys, in conjunction with the results of older excavation trenches, revealed that the Quaternary deposits have been investigated at depths ranging from 0.5 up to 28.5 meters. Furthermore, the lithological boundary of these post-alpine deposits and their underlying pyroclastic ignimbrite flow (with resistivity 24.0–58.0 Ohm.m) seem to dip to the north. The volume of the Quaternary layer is proposed as the maximum depth for archaeological investigation with high chances to recover more Paleolithic material. [ABSTRACT FROM AUTHOR]

In biogeopolitics, the key state stakeholders develop and aim to accomplish their geopolitical goals by (mis)management and biopolitical governance of vulnerable population. In this paper, this population refers to asylum‐related migrants who use or aim to use an asylum request as their entry mechanism to the European Union. This paper explores the emergence of biogeopolitics at the EU borderland between Turkey and Greece during the COVID‐19 pandemic in 2020. Statistics about irregular migration from Turkey to Greece, field observations in Lesvos (Greece) as well as media and social media discussions about COVID‐19 in Lesvos are analysed. In the biogeopolitics of COVID‐19, the governance and (mis)management of asylum‐related migrants include policies and practices to let these migrants to live or die, including regulating illegal border‐crossings, everyday living conditions at the reception centres, and actions regarding the pandemic. The COVID‐19 pandemic was used as an additional tool to foster biogeopolitics. [ABSTRACT FROM AUTHOR]

Data recordings of the movement of vehicles can be enriched with heterogeneous and multimodal data beyond latitude, longitude, and timestamp and enhanced with complementary segmentations, constituting a semantic trajectory. Semantic Web (SW) technologies have been extensively used for the semantic integration of heterogeneous and multimodal movement-related data, and for the effective modeling of semantic trajectories, in several domains. In this paper, we present an integrated solution for the engineering of cultural heritage semantic trajectories generated from unmanned aerial vehicles (UAVs) and represented as knowledge graphs (KGs). Particularly, this work is motivated by, and evaluated based on, the application domain of UAV missions for documenting regions/points of cultural heritage interest. In this context, this research work extends our previous work on UAV semantic trajectories, contributing (a) an updated methodology for the engineering of semantic trajectories as KGs (STaKG), (b) an implemented toolset for the management of KG-based semantic trajectories, (c) a refined ontology for the representation of knowledge related to UAV semantic trajectories and to cultural heritage documentation, and (d) the application and evaluation of the proposed methodology, the developed toolset, and the ontology within the domain of UAV-based cultural heritage documentation. The evaluation of the integrated UAV solution was achieved by exploiting real datasets collected during three UAV missions to document sites of cultural interest in Lesvos, Greece, i.e., the UNESCO-protected petrified forest of Lesvos Petrified Forest/Geopark, the village of Vrissa, and University Hill. [ABSTRACT FROM AUTHOR]

In this paper, we examine how bordered reality is being imposed and resisted in the context of where we are placed right now, 'Greece'. Drawing on ethnographic research and discourse analysis, conducted in Lesvos, Samos, and Athens (from March to September 2016), we examine how resistance to a bordered reality took place, as islands in the north Aegean, as well as Greek and European territories, were being remapped according to the logic of the hotspot. We approach this process methodologically from the situated angle of the embodiment of resistance in the concrete experiences of people (including the researchers ourselves), whose narratives reveal the distracted spatial coordinates of the 'hotspot regime', which becomes a traveling control device. Rather than approaching the hotspots on the five Greek border islands as geographically fixed entities we introduce the concept of the mobile hotspot to show how the logic of the hotspot suffuses the uneven geographies of a bordered reality. We use the ferry as an illustrative tool with which to critically explore the density, tensions, and conflict-ridden nature of movements within, around, and against the hotspots. [ABSTRACT FROM AUTHOR]

The recovery phase of an earthquake-affected settlement is a time-consuming and complex process that requires monitoring, which is now possible using UAS. The purpose of this paper is to present the methodology followed and the results obtained by the exploitation of UAS for rapid multitemporal 3D mapping during the recovery phase of Vrisa traditional settlement, Lesvos island, Greece, which was highly damaged by the earthquake (Mw=6.3) on 12th June 2017. More analytically, three (3) flight campaigns covering the period July 2017 – May 2020 took place by means of an UAS for collecting high-resolution images on: i) 19th May 2019, ii) 29th September 2019, iii) 17th May 2020. Structure from Motion (SfM) and Multi Stereo View (MSV) methods have been applied and produced: i) Digital Surface Models – DSMs, ii) 3D Point Clouds – 3DPC and iii) Orthophoto-maps, of Vrisa. In parallel, GIS capabilities has been exploit to calculate building volumes based on: a) DSM produced by UAS image processing, b) DEM produced by 233 RTK measurements and c) building footprints derived by the digitization of the orthophoto-map of 25th July 2017. The methodology developed and implemented achieves extremely reliable results in a relatively easy, fast and economically feasible way, which is confirmed with great precision by field work. By applying the above-described methodology, it was possible to monitoring the recovery phase during July 2017 and May 2020 which 302/340 buildings that had been severely damaged by the earthquake have been demolished. A small number of new buildings have also been rebuilded and small number of buildings that have just begun excavations for their construction. An important parameter for obtaining reliable data and comparable results is the correct selection of flight parameters and their maintenance at all times when it is decided to take data, without affecting the accuracy of the results from taking photos or videos. Automation in the future of the proposed methodology can significantly accelerate the achievement of reliable results without the intermediate interpretation of orthophoto-maps. [ABSTRACT FROM AUTHOR]

Vegetation index time-series analysis of multitemporal satellite data is widely used to study vegetation dynamics in the present climate change era. This paper proposes a systematic methodology to predict the Normalized Difference Vegetation Index (NDVI) using time-series data extracted from the Moderate Resolution Imaging Spectroradiometer (MODIS). The key idea is to obtain accurate NDVI predictions by combining the merits of two effective computational intelligence techniques; namely, fuzzy clustering and long short-term memory (LSTM) neural networks under the framework of dynamic time warping (DTW) similarity measure. The study area is the Lesvos Island, located in the Aegean Sea, Greece, which is an insular environment in the Mediterranean coastal region. The algorithmic steps and the main contributions of the current work are described as follows. (1) A data reduction mechanism was applied to obtain a set of representative time series. (2) Since DTW is a similarity measure and not a distance, a multidimensional scaling approach was applied to transform the representative time series into points in a low-dimensional space, thus enabling the use of the Euclidean distance. (3) An efficient optimal fuzzy clustering scheme was implemented to obtain the optimal number of clusters that better described the underline distribution of the low-dimensional points. (4) The center of each cluster was mapped into time series, which were the mean of all representative time series that corresponded to the points belonging to that cluster. (5) Finally, the time series obtained in the last step were further processed in terms of LSTM neural networks. In particular, development and evaluation of the LSTM models was carried out considering a one-year period, i.e., 12 monthly time steps. The results indicate that the method identified unique time-series patterns of NDVI among different CORINE land-use/land-cover (LULC) types. The LSTM networks predicted the NDVI with root mean squared error (RMSE) ranging from 0.017 to 0.079. For the validation year of 2020, the difference between forecasted and actual NDVI was less than 0.1 in most of the study area. This study indicates that the synergy of the optimal fuzzy clustering based on DTW similarity of NDVI time-series data and the use of LSTM networks with clustered data can provide useful results for monitoring vegetation dynamics in fragmented Mediterranean ecosystems. [ABSTRACT FROM AUTHOR]

The purpose of this paper was to study the influence of cartographic scale and flight design on data acquisition using unmanned aerial systems (UASs) to create augmented reality 3D geovisualization of geosites. The relationship between geographical and cartographic scales, the spatial resolution of UAS-acquired images, along with their relationship with the produced 3D models of geosites, were investigated. Additionally, the lighting of the produced 3D models was examined as a key visual variable in the 3D space. Furthermore, the adaptation of the 360° panoramas as environmental lighting parameters was considered. The geosite selected as a case study was the gorge of the river Voulgaris in the western part of the island of Lesvos, which is located in the northeastern part of the Aegean Sea in Greece. The methodology applied consisted of four pillars: (i) scale-variant flight planning, (ii) data acquisition, (iii) data processing, (iv) AR, 3D geovisualization. Based on the geographic and cartographic scales, the flight design calculates the most appropriate flight parameters (height, speed, and image overlaps) to achieve the desired spatial resolution (3 cm) capable of illustrating all the scale-variant details of the geosite when mapped in 3D. High-resolution oblique aerial images and 360° panoramic aerial images were acquired using scale-variant flight plans. The data were processed using image processing algorithms to produce 3D models and create mosaic panoramas. The 3D geovisualization of the geosite selected was created using the textured 3D model produced from the aerial images. The panoramic images were converted to high-dynamic-range image (HDRI) panoramas and used as a background to the 3D model. The geovisualization was transferred and displayed in the virtual space where the panoramas were used as a light source, thus enlightening the model. Data acquisition and flight planning were crucial scale-variant steps in the 3D geovisualization. These two processes comprised the most important factors in 3D geovisualization creation embedded in the virtual space as they designated the geometry of the 3D model. The use of panoramas as the illumination parameter of an outdoor 3D scene of a geosite contributed significantly to its photorealistic performance into the 3D augmented reality and virtual space. [ABSTRACT FROM AUTHOR]

This paper critically examines the characteristics of low-intensity, small-scale family farming and related aspects of farming sustainability, in a marginally productive peri-urban landscape, that of the capital town of Lesvos Island, Mytilini, Greece. These aspects and characteristics are explored on the basis of farmers'-landowners' perceptions and visions of local landscape/land use change, through a questionnaire survey. Our findings indicate that production is basically aimed for self-consumption; such practices yield low incomes but bear high cultural values, mostly run by hobby and part-time farmers-landowners, lacking agricultural education. Olive crops are the dominant, but decreasing, form of production, while some other less-water-reliant cultivations are increasing. Peri-urban small family farming remains significant, but in need of new policies/strategies further promoting its value and role. [ABSTRACT FROM AUTHOR]

This paper intervenes in recent debates on humanitarianism and security in migration by introducing the notion of 'pop-up governance'. It reflects on our two year-long fieldwork on Lesbos, Greece at the peak of Europe's migrant reception crisis (2015–2017). We present recent developments in border and migration management in the EU and we position these within recent migration debates. We then present the two main facets guiding migrant reception and governance in Lesbos, namely humanitarianism and security. Through our interviews with humanitarian and security actors we show how top-level government decisions followed and resembled the flexibility and adaptability of humanitarian and security operations. We define this turn as 'pop-up governance', which comprises a practice-based, abruptly introduced and retractable set of governance mechanisms responding to the situation at hand. We argue that the seemingly disorganised management of migration actually bore hallmarks of a new, flexible and adaptable mode of governance. Finally, we show how 'pop-up governance' can help move beyond present understanding of governance based either on the rule or its exception. This has important implications for our comprehension of migration, humanitarianism, security and the governance of vulnerable populations and contemporary socio-political crises. [ABSTRACT FROM AUTHOR]

In recent years 3D building modelling techniques are commonly used in various domains such as navigation, urban planning and disaster management, mostly confined to visualization purposes. The 3D building models are produced at various Levels of Detail (LOD) in the CityGML standard, that not only visualize complex urban environment but also allows queries and analysis. The aim of this paper is to present the methodology and the results of the comparison among two scenarios of LOD2 building models, which have been generated by the derivate UAS data acquired from two flight campaigns in different altitudes. The study was applied in Vrisa traditional settlement, Lesvos island, Greece, which was affected by a devastating earthquake of Mw = 6.3 on 12th June 2017. Specifically, the two scenarios were created by the results that were derived from two different flight campaigns which were: i) on 12th January 2020 with a flying altitude of 100 m and ii) on 4th February 2020 with a flying altitude of 40 m, both with a nadir camera position. The LOD2 buildings were generated in a part of Vrisa settlement consisted of 80 buildings using the footprints of the buildings, Digital Surface Models (DSMs), a Digital Elevation Model (DEM) and orthophoto maps of the area. Afterwards, a comparison was implemented between the LOD2 buildings of the two different scenarios, with their volumes and their heights. Subsequently, the heights of the LOD2 buildings were compared with the heights of the respective terrestrial laser scanner (TLS) models. Additionally, the roofs of the LOD2 buildings were evaluated through visual inspections. The results showed that the 65 of 80 LOD2 buildings were generated accurately in terms of their heights and roof types for the first scenario and 64 for the second respectively. Finally, the comparison of the results proved that the generation of post-earthquake LOD2 buildings can be achieved with the appropriate UAS data acquired at a flying altitude of 100 m and they are not affected significantly by a lower one altitude. [ABSTRACT FROM AUTHOR]

Bluetongue virus (BTV) causes an infectious disease called bluetongue, a vector‐borne viral disease of ruminants, which has major implications and causes severe economic damage due to its effect on livestock. These economic costs are mostly ascribed to the trade restrictions imposed during the epidemic period. In August 2014, an epidemic of bluetongue occurred in the island of Lesvos, Greece. The epidemic was severe and evolved over time, lasting until December 2014. The total cases of infected farms were 490, including a total number of 136,368 small ruminants. In this paper, we describe a bluetongue virus serotype 4 (BTV‐4) epidemic and utilize Bayesian epidemic models to capture the spatio‐temporal spread of the disease. Our study provides important insights into the drivers of BTV transmission and has implications for designing control strategies. The results showed strong spatial autocorrelations, with BTV being more likely to spread between farms located nearby. The spatial modelling results proposed a certain spatial radius (~12 km) around the onset of a similar epidemic for imposing restrictions on animal movement, which can be sufficient for the control of the disease and limit economic damage. [ABSTRACT FROM AUTHOR]

The paper reports a palaeoxylotomical study of petrified palm remains (stem, root, rachis) collected from some fossil sites of Greece (Evros, Lemnos, Lesbos and Kastoria) aged to the late Oligocene to early Miocene. Five species of Palmoxylon were identified: P. daemonoropsoides (Unger) Kirchheimer, corr., P. chamaeropsoides Iamandei et Iamandei, sp. nov., P. coryphoides Ambwani et Mehrotra, P. sabaloides Greguss, P. trachycarpoides Iamandei et Iamandei, sp. nov. and P. phoenicoides Hofmann. Also found were two species of Rhizopalmoxylon (R. daemonoropsoides Iamandei et Iamandei, sp. nov., R. phoenicoides Iamandei et Iamandei, sp. nov.) and Palmocaulon sp. aff. Phoenix L. These new identifications add new elements to the forest assemblages of the Oligocene–Miocene Greek flora, useful for understanding the evolution of the Cenozoic palaeoclimate in the Aegean area. [ABSTRACT FROM AUTHOR]

Global environmental challenges brought on by over-consumption, limited resources, and climate change will task teacher education programs to prepare teacher candidates with new paradigms in problem-solving, collaboration, and innovation. Skills such as collaborating across cultures and borders, thinking critically and creatively, reflecting on deeply embedded assumptions, and negotiating uncertainty will all be needed to surmount these challenges. EcoJustice education addresses these needs. When combined with critical place-based pedagogies, skills, and attitudes associated with global citizenship may also develop. Four preservice teachers participated in a research trip to Lesvos, Greece, to learn about and aid in the refugee crisis there. Participants documented their experiences via critical reflections and dialogues and analyzed these data. Findings suggest that through engagement in a critical place-based learning experience, preservice teachers challenged conceptions of their role as Americans and shifted towards a more global, EcoJustice consciousness. [ABSTRACT FROM AUTHOR]

Coastal and marine ecosystems are under high pressure from multiple activities that take place in coastal areas. Mapping and assessment of ecosystem services are considered essential to support decision-making in policies on the sustainable management of these areas. In this paper, an integrated indicator has been developed and applied to map and assess Recreation Opportunities that are supplied by coastal and marine ecosystems on the Island of Lesvos, North Aegean, Greece, which is an area of great natural wealth and beauty, but it is under numerous threats from various activities that take place within its boundaries. The proposed indicator integrates biophysical, social and managerial aspects of Ecosystem Services (ES) to assess potential ES flow. It is a flexible methodology that utilizes available data and user-friendly geo-technologies and can be used for local scale assessment. A discussion is carried out on the importance of such methodologies for Marine Spatial Planning (MSP), and recommendations are made as to how this indicator may be improved. • A composite indicator for mapping and assessing coastal and marine Cultural Ecosystem Services (CES). • Integration of biophysical, social and managerial aspects of Ecosystem Services (ES). • Assessment of coastal recreation opportunities. • Mapping of Cultural Ecosystem Services (CES) is of high importance for Marine Spatial Planning. [ABSTRACT FROM AUTHOR]

The use of fishing nets has a widespread impact on marine, saline-brackish, and freshwater environments, as well as the species occurring in them. While the nets are intended to capture fish and other target species, they often result in high mortality rates of many other fauna species through bycatch and entanglement. Fishing nets that are lost, destroyed, or reach the end of their lifespan are often referred to as "ghost nets", posing a major threat to fauna as hundreds of species become fatally entangled. Here, we report for the first time an incident of a terrestrial snake, a Caspian whipsnake (Dolichophis caspius), which we found entangled onshore in a ghost net on Lesvos Island, Greece. The snake was released into its natural habitat after being carefully disentangled. This incident highlights the need for proper disposal of fishing nets to prevent future entanglements and mortality of non-target species. [ABSTRACT FROM AUTHOR]

Geosites are an important part of geoheritage, thus their detailed mapping is crucial for their management, protection and promotion processes. However, there is no specific approach to three-dimensional (3D) mapping of geosites and a full investigation is required, considering the current advances in the science of Geoinformatics and the need for setting up an integrated system that will suggest a suitable way of mapping areas of geological significance. The main purpose of this study is to explore new approaches to the 3D mapping of geosites, where the unmanned aerial vehicles' (UAVs) flight planning is based on the digital elevation model (DEM). The case study that is being examined is the tectonic window of Mount Olympus, located in the southeast of Lesvos island, Greece. In this paper, a methodology has been developed to create flight plans for geosite 3D mapping. This methodology consists of three main stages: (a) flight planning based on SRTM-DEM, (b) data acquisition and image-based 3D modelling, and (c) comparison (flight plans and results). A semi-automated algorithm was developed for designing the flights, taking into account the topography of the mapped area (slope, aspect, elevation) and the final cartographic derivatives. The flight plans were compared with each other in levels of data collection, flight characteristics and their results. The results of this study are dense point clouds, DEMs and orthophotomaps. The algorithms that have been used for the comparison of point clouds were (I) surface density, (II) number of neighbours (NN), and (III) roughness and surface profile. The conclusion drawn from this study is that the DEM is a valuable source of information that can be used in designing flight plans specially shaped on the topography of each geosite. [ABSTRACT FROM AUTHOR]

In a post-earthquake scenario, the semantic enrichment of 3D building models with seismic damage is crucial from the perspective of disaster management. This paper aims to present the methodology and the results for the Level of Detail 3 (LOD3) building modelling (after an earthquake) with the enrichment of the semantics of the seismic damage based on the European Macroseismic Scale (EMS-98). The study area is the Vrisa traditional settlement on the island of Lesvos, Greece, which was affected by a devastating earthquake of Mw = 6.3 on 12 June 2017. The applied methodology consists of the following steps: (a) unmanned aircraft systems (UAS) nadir and oblique images are acquired and photogrammetrically processed for 3D point cloud generation, (b) 3D building models are created based on 3D point clouds and (c) 3D building models are transformed into a LOD3 City Geography Markup Language (CityGML) standard with enriched semantics of the related seismic damage of every part of the building (walls, roof, etc.). The results show that in following this methodology, CityGML LOD3 models can be generated and enriched with buildings' seismic damage. These models can assist in the decision-making process during the recovery phase of a settlement as well as be the basis for its monitoring over time. Finally, these models can contribute to the estimation of the reconstruction cost of the buildings. [ABSTRACT FROM AUTHOR]

The article engages with the relationship between the chronopolitics of mobility and migrants' narratives of the past, their present suffering, and hope for the future. Data collected through observation and repeat interviews with migrants in the Moria and Kara Tepe camps in Lesvos, Greece, challenge the assumption that 'time' spent waiting in the camps by illegalized migrants represents a linear and singular metanarrative of the migrant in 'temporal suspension' from the 'grid of modernity'. I suggest, that the concept of historical time allows for a critical analysis of illegalized migrants' narratives of their past lives, their present suffering and future aspirations, through which they challenge the chronopolitics of control inherent in the current EU migration system. While such narratives might at first sight be understood as accepting a migration system based on suspension and gradual re-introduction into western historical and political time, they present a challenge to the exceptionality of western modernity and their suspension from it. I also argue, that narratives of 'pasts', 'the present' and hope for the 'future', challenge academic discourses of migration that centre on the notion of 'bare life', where historical and political time is suspended in the liminal space of the camp. [ABSTRACT FROM AUTHOR]

The Aegean Sea and its landscape stretching across the Greek-Turkish border has since the establishment of the Greek state always been a space of inter-locking politics and discourses surrounding the figure of the refugee. Since the so-called refugee crisis, processes of construction of refugee deservingness have increasingly centered around the category of vulnerability. Ethnographic work conducted on the island of Lesbos and in Athens between 2017 and 2019 permits an examination of the ways in which contemporary asylum and reception services construct layers of human worthiness and spaces of worth extraction. Denial of urgency, prioritization, and normalization are key strategies of the spatial governance of the displaced in the Aegean borderscape. Juxtaposing the 1923 Population Exchange with the more recent displacement suggests some continuities, similarities, and differences that can lead to a deeper understanding of the geographical, social, and political factors that continue to shape the meaning of the refugee in contemporary Greece. [ABSTRACT FROM AUTHOR]

The last decade increasing attention to litter accumulation in the marine environment revealed the issue of the terrestrial fluxes of plastic pollution into the oceans. However, limited studies investigate the macro-litter abundance and composition particularly in freshwater ecosystems and the adjusted coastal environment. In this study, we conducted an empirical analysis of anthropogenic litter (AL) in two freshwater streams and their estuaries of Lesvos island (Greece), strongly affected by the waste mismanagement in the Moria refugee camp. A total of 1,622 litter items were collected from five sites during the field campaign between the 3rd and 6th of June 2019. Among these, artificial polymer items (mainly drink bottles, single-use plastic bags, cutlery, and trays) irrespective of the site location constituted the major part ranging from 46 to 91% of total AL by mass. Drink bottles and plastic cutlery are found in higher percentage at Moria camp river and its estuary, while packaging and bag litter are more abundant at upstream sites. The operation of the camp has increased the AL abundance 13 times more than the reference site, causing severe threat to human health and to freshwater and marine environment. It is therefore important to improve the waste management system at (inter)national (change in production and packaging policy) and local scale (introducing sustainable solutions to refugee camp design) by promoting recycling and circular economy projects to diminish AL pollution. [ABSTRACT FROM AUTHOR]

Today coastal erosion is usually exacerbated by anthropogenic climate change and results in the loss of income and cultural norms, as well as in the loss or degradation of ecosystem services. Public perceptions and participation have an important role – often a legal one – in coastal management and response to coastal hazards. The objective of this study is to assess residents' perceptions about coastal erosion and the significance of coastal protection and restoration. This paper presents the results of a study conducted in Mytilene, the main city on the island of Lesvos, Greece. Residents recognize the impact of coastal erosion on their daily lives and recognize the anthropogenic causes of coastal erosion problems including climate change impacts. They admit their share in creating pressures and impacts on the beaches and are aware of the common protection works such as sand nourishment, groins and breakwaters construction. However, while they perceive beaches as the public common, residents indicated unwillingness to pay for coastal zone restoration and protection. Results suggest that respondents prefer volunteering activities and public awareness actions to payment or charges for coastal zone protection. [Display omitted] • Mytilene's residents are aware of the coastal erosion issues and connect them mostly with human uses • Mytilene's residents are also aware of the most common technical measures to tackle erosion problems • Most of the respondents choose not to pay for coastal protection/restoration measures • Respondents likely to pay choose the two reasons related with intragenerational justice and coastal resources future use [ABSTRACT FROM AUTHOR]

Based on long term archaeological ethnography on the border island of Lesvos situated on Europe's margins, this article explores the regimes of eating and the role of food practices in the refugee camp/processing centre of Moria. Starting from the double liminality of eating and border-crossing, it outlines and juxtaposes two regimes of corporeal life. The first is the biopolitical arena of official food provision as produced by the border apparatus and the logic of humanitarian governmentality. This regulates border-crosser's time and daily routines and renders them 'people of concern', tress-passers or victimized individuals with no agency. The second is the affective, trans-corporeal, multi-sensorial field of cooking, eating, making kin, making community. It is produced through the agency of border-crossers themselves, when they take charge of their own eating. In doing so, they constitute eating in these liminal conditions as affirmative biopolitics, as the affirmative politics of life and hope. [ABSTRACT FROM AUTHOR]

Civil society actors aiding border crossers in Europe have been subject to systematic criminalization through prosecutions and attempted prosecutions, extensive police harassment, public scapegoating, and the imposition of bureaucratic barriers. We seek to explain why this is occurring through the analysis of field research data, collected in Greece between 2017 and 2019, through the lens of Derrida's concept of "hostile hospitality". We develop a theoretical framework with three key features: first, the demarcation between insider and outsider which lies at the core of notions of hospitality; second, the constitutive relationship between hostility and hospitality which is closely related to notions of sovereignty; and third, the primacy of state definitions of hospitality, which subordinate private and collective hospitality practices. This explanatory framework guides the analysis of two case studies from our fieldwork: the criminalization of solidarity initiatives providing accommodation in squats in Athens and Pikpa camp on Lesvos, and the criminalization of boat-spotting and search and rescue activities on Lesvos. We conclude that civil society actors aiding border crossers in Greece are criminalized because they challenge and interfere with state policies and practices of hostile hospitality. [ABSTRACT FROM AUTHOR]

In the aftermath of Europe's 2015 so-called refugee 'crisis', tens of thousands of border crossers remain stuck in Greece aided by an array of humanitarian workers, government employees, and volunteers. Drawing on previous scholarship about street-level bureaucracy, I discuss the work of informal volunteers in Athens and Lesvos, where they continue to aid border crossers attain entitlements and rights. Based on 10 months of ethnographic research conducted from 2017 to 2018, this article explores how volunteers within the humanitarian landscape of Greece sought to enact their ethical principles within governance regimes that categorized border crossers in restrictive and at times harmful ways. I show how the struggle to assist border crossers in effect transformed volunteers into informal street-level bureaucrats, who drew on a range of tactics that simultaneously reproduced and subverted the policy categories of refugee or vulnerable person. This article argues that rather than facilitating administrative care of border crossers, these categories were in fact a political battleground upon which volunteers struggled to pursue their moral rationalities despite an exclusionary governance regime. [ABSTRACT FROM AUTHOR]

The study focuses on refugee children who live in a temporary transit camp on the Island of Lesbos in Greece, and attend a unique school, which, in the camp's temporary conditions, endeavours to provide the children with safety, security, and an adaptive learning experience. It examines hope among the refugee children by means of the Children's Hope Scale (Snyder, 1997), which was administered to 132 children aged 6-16 who attend the school. The general hope scores among the refugee children were similar to those found in other children's populations. Hope scores in the Adolescent group (aged 12-16) were lower than in the other groups, and highest in the Intermediate group (aged 9-12). Additionally, differences were found between groups of children from different countries of origin. The findings indicate that the Adolescent children are more aware of the difficulties and dangers entailed in fleeing, and of the price they have paid for leaving their homes and being cut off from their extended family and community. The findings highlight the school's contribution as a space, albeit temporary, where the children can function normatively as students in a safe environment that enables new growth in cognitive, emotional, and social realms. [ABSTRACT FROM AUTHOR]

Frequency of flash floods and droughts in the Mediterranean climate zone is expected to rise in the coming years due to change of its climate. The assessment of the climate change impact at a basin scale is essential for developing mitigation and adaptation plans. This study analyses the variation of the hydrologic regime of a small Mediterranean river (the Kalloni river in Lesvos Island, Greece) by the examination of possible future climate change scenarios. The hydrologic response of the basin was simulated based on Hydrologic Modeling System developed by the Hydrologic Engineering Center (HEC-HMS). Weather Generator version 6 from the Long Ashton Research Station (LARS-WG 6.0) was utilized to forecast climate data from 2021 to 2080. These forecasted climate data were then assigned as weather inputs to HEC-HMS to downscale the climate predictions of five large-scale general circulation models (GCMs) for three possible emission scenarios (such as RCP 2.6, RCP 4.5, and RCP 8.5). The alteration of the Kalloni hydrologic regime is evaluated by comparing GCMs based estimates of future streamflow and evapotranspiration with business as usual (BaU) scenario. Variation was noted in seasonal and in annual scale forecasting of long-term average discharges, which show increasing trend in autumn and decreasing in summer and there is observed a general upward trend of actual evapotranspiration losses. [ABSTRACT FROM AUTHOR]

This study explores the educational level of migrants arriving in Europe since 2015 and makes suggestions to improve their integration into the labor market. The research methodology is based on qualitative (ethnographic research) and quantitative analysis using questionnaires distributed in four languages to the refugee scientists living in Moria camp, Lesvos, Greece. Only 53% of migrants hold their certificates and half of them speak two languages. The priority topics for further education are Humanities, Science, Economics and Computer Sciences. Key aspects were considered to help the refugee's social integration such as information exchange, intercultural education and to stop gender inequalities. [ABSTRACT FROM AUTHOR]

Soil microbial biomass carbon (Cmic) and nitrogen (Nmic) dynamics were studied in five representative land use of Mediterranean agroecosystems over two consecutive years on a seasonal basis on the island of Lesvos, Greece. Soil samples from natural forests, olive groves, wheat cultivations, pasture, and annual crop rotation were collected from plots that had been managed conventionally according to local practices. The Cmic and Nmic values ranged from 86.8 to 565.1 and from 14.7 to 101.6 mg kg-1 dry soil, respectively, being affected by both land use and season. Their average values increased in the order of arable < forest ≤ pasture. Similar to all land uses, Cmic and Nmic showed a significant, land-use dependence with seasonal variation. Specifically, summer minima and autumn maxima highlighted how hot and dry Mediterranean summers affect the activity of soil micro-organisms. Cmic to organic C (Corg) and Nmic to total N (Ntot) ratios ranged from 1.3 to 4.0 and 2.0 to 11.2, respectively, and were also affected by land use and season. Seasonal variation of Cmic to Corg and Nmic to Ntot ratios followed the general trend of Cmic and Nmic only in the land uses that do not incorporate crop residues. The Cmic: Nmic average ratio was 6.86 and was the only one soil microbial biomass parameter studied where seasonal variability exceeded land-use variability. [ABSTRACT FROM AUTHOR]

Air pollution is one of the most important branches of environmental science as it affects human health, climate and ecosystems. Emissions of air pollutants from transport (vehicles and ships) in port cities strongly affect air quality at local scales, warranting for a combination of theoretical and experimental studies to identify pollution hotspots. The purpose of this paper is to provide a methodology for developing a hybrid emission inventory from transport sector for two port cities located respectively on the Northern Aegean islands of Chios and Lesvos. Emission inventories were constructed for the year 2014 based on top-down and bottom-up approaches. Official data from local authorities and survey results were used for the calculation of emissions. Traffic emissions were spatially allocated to the road network based on population data and hourly traffic counts, and distributed over time (on an hourly basis) with the use of local temporal coefficients. Regarding carbon monoxide road emissions, the highest quantities are mainly emitted by Passenger Cars (43%,32% in Chios and Lesvos respectively) while for PM 10 emissions, trucks have the largest share (66% in Chios and 86% in Lesvos). The pollutants that are emitted in greater quantities from the ships at the ports of Mytilene and Chios are NO x , followed by SO 2 and CO. Most of the ship emissions in the ports occur by the ships at berth, as they remain berthed for hours whereas maneuvering lasts 15–20 min. As for the daily contribution of the two transport sources to the pollution profile of Mytilene, road emissions are higher for almost all pollutants. However, the contribution of ship emissions is not negligible, especially during the touristic period when marine traffic increases and emissions close to the port area become more important than those from road transport. Image 1 • CO emissions are related to Passenger Cars while PM emissions are related to trucks. • Ships affect mostly NO x , SO 2 and PM emissions. • Temporal coefficients from real time traffic counts were developed. • Transport sectors affect air quality almost equally during the touristic period. • Hybrid emission inventories reflect more accurately reality. The study applies a methodology for developing a hybrid emission inventory from transport sector for port cities. [ABSTRACT FROM AUTHOR]

The article describes the crisis pertaining to the plight of refugees at Moria, a refugee camp on Lesvos Island in Greece. Topics covered how the history and culture of Iran is directly tied to the history and culture of the Afghan people, the passage of the refugees across Aegean Sea and the impact of the COVID-19 pandemic on the situation of Greek refugees.

The Petrified Forest of Lesbos comprises silicified tree fossils at multiple stratigraphic levels within the Lower Miocene Sigri Pyroclastic Formation. Our objective was to understand the interplay of tectonic setting, structural evolution, volcanological setting and basin evolution in the preservation of this remarkable natural monument. Sections were logged for lithology, sedimentary structures and hydrothermal alteration. Orientations of fallen fossil trees were measured. Samples were taken for mineralogical and geochemical analysis. 40Ar/39Ar dating was carried out on mineral separates from four samples. Widespread andesite‐dacite domes, the Eressos Formation, intrude and overlie metamorphic basement and are overlain by the Sigri Pyroclastic Formation, which comprises several hundreds of metres of pyroclastic flow tuffs (unwelded ignimbrites) interbedded with fluvial conglomerate and volcaniclastic sandstone. The Sigri Pyroclastic Formation ranges in age from 21.5 to 22 Ma, where it overlies the lacustrine Gavathas Formation, to younger than 18.4 Ma. Tuffs and fluvial conglomerates in the Sigri Pyroclastic Formation coarsen eastwards, and petrified trees and soil horizons occur throughout the Formation. The recurrence of pyroclastic flows was approximately one every 20 ka, so destructive flows were relatively infrequent, allowing the development of climax vegetation between most eruptions. Conglomerate‐filled channels show that rivers flowed westwards. Tree fall directions indicate NW to N movement of pyroclastic flows, implying a source near the younger Mesotopos–Tavari caldera to the south. The basin, which formed in a NNE‐trending dextral strike‐slip regime, provided some topographic steering. Following the Sigri Pyroclastic Formation at ca. 18 Ma, there was a rapid increase in the pace of volcanic activity, with the eruption of thick lava sequences and welded ignimbrites, and intrusion of dykes and laccoliths in SW Lesbos. Rapid burial by permeable tuffs, silica from alteration of volcanic ash, and later hydrothermal circulation all contributed to the preservation of the petrified trees. [ABSTRACT FROM AUTHOR]

The contribution of Unmanned Aircraft Systems (UAS, UAV or RPAS) is increasingly acknowledged, researched, tested and applied in a vast variety of fields. Earth Sciences are among the greatest beneficiaries of this development, in terms of having more than an eye in the sky during field work, approaching inaccessible locations and applying Structure from Motion (SfM) methodologies for research in geomorphology, geological mapping, hydrological modeling, mass movement mapping etc. Detailed mapping and evaluation of findings is a critical element of syn- and post-disaster period, for assessing the impacts and their spatial distribution, helping recovery by facilitating aid allocation, coordinating relief efforts, monitoring lifelines status, monitoring of clean-up, and assessing secondary effects or induced hazards. In this paper, the research team summarizes the experience obtained during their involvement in natural disaster mapping of recent (2017-2018) significant catastrophic events in Greece. A survey team equipped with cost effective drones was deployed during and/or after disastrous earthquake, mass movement, flash flood and wildfire events. This resulted in a variety of product types in terms of contribution to post disaster research and emergency management, resulting also in a number of pros and cons in terms of prerequisites and risks of the process. Mapping with drones is essentially field work, and is designed and executed as such. Moreover, it is aviation, so application of strict safety guidelines is a prerequisite. The combination of the two at disaster sites requires technical efficiency, expertise according to the disaster type, team coordination, pilot skills, experience and training, along with a flexible mission risk assessment at all times.Herewith, results of disaster mapping are presented for the earthquake (2017) and mass movements (2017-2018) in Lesvos, the deadly flash floods in West Attica (Mandra, 2017, 2018) and the deadly wildfires in East Attica (Rafina, Mati, 2018). Pros, such as capturing of phenomena dynamics and intact disaster scenery in explicit detail and cons, such as risks, equipment limitations and safety issues are discussed, and some elementary guidelines for the overall process are proposed. Following the cycle of disaster management, the process involves steps to be taken during the pre-disaster phase, the warning/alarm phase, the impact and emergency response phase etc. so that a drone equipped team be readily operational and effective at any given time a disaster occurs. [ABSTRACT FROM AUTHOR]

Eumerus Meigen (Diptera, Syrphidae) is one of the most speciose hoverfly genera in Europe, with several species groups recognized within. As part of the tricolor group of species, a subgroup of long-legged representatives stands out. We name it Eumerus binominatus subgroup and provide descriptions for two new European species which belong to this subgroup: E. grallator sp. nov. from mainland Spain and E. tenuitarsis sp. nov. from Lesvos and Evros, Greece. A key for all five recognized species of the binominatus subgroup is provided. [ABSTRACT FROM AUTHOR]

Purpose: During the European refugee crisis, numerous Greek and international rescue workers are operating in Lesvos, offering search, rescue, and first aid services. Exposure to stressful life events while engaging in this rescue work can result in developing Post-Traumatic Stress Disorder (PTSD). The study aimed to assess the prevalence of PTSD and explore potential differences between different categories of rescuers.Methods: A cross-sectional study was conducted among 217 rescue workers. Participants were grouped according to affiliation: "Greek Professionals Rescuers/GPR", "International Professionals Rescuers/IPR" and "Volunteer Rescuers/VR". The PTSD Checklist-Civilian Version (PCL-C) was utilized. All tests were two-tailed (a = 0.05). Mann-Whitney, Kruskal-Wallis, and multivariate logistic regression were performed.Results: Overall probable PTSD prevalence found was 17.1%. Rates varied significantly per rescuer's category; 23.1% in GPR, 11.8% in IPR, and 14.6% in VR (p = 0.02). GPR demonstrated the highest risk compared to IPR and VR (p < 0.001). Females had approximately two times higher risk. Other significant risk factors included marital status, age, and number of children. Lack of previous experience, longer operation period, longer shift hours, and handling dead refugees and dead children were also considered major risk factors.Conclusions: Rescue workers providing substantial aid to the refugees and migrants at Lesvos experience significant psychological distress. The present findings indicate the urgent need for targeted interventions. Further studies are needed to address long-term effects of the refugee crisis on rescuers, and explore effective measures to prevent PTSD. [ABSTRACT FROM AUTHOR]

In Mediterranean Europe, wood-pasture landscapes with oak woodlands as emblematic ecosystems are undergoing rapid land-use change, which may threaten their legacy as hotspots of biodiversity, ecosystem services, and cultural heritage. The objective of this study was to quantify land cover changes and transitions as well as the dynamics of oak woodland patterns and densities over 50 years in two municipalities at the center and edges of Quercus macrolepis distribution in Northern Lesvos (Greece). We used aerial photographs from 1960 and WorldView-2 satellite images from 2010 to process land cover maps and metrics, and to calculate oak canopy cover with a point-grid sampling approach. Spatiotemporal dynamics of land cover change were generally high-especially between oak woodlands and grass- and shrub-lands, resulting in a more heterogeneous and fragmented landscape in 2010. Surprisingly, oak woodland area remained stable with marginal losses in one study site and gains in the other one. Oak canopy cover increased by 8 and 9 %. Spatial hotspots of change were mountainous and peripheral phrygana areas with expanding oak stands, as well as river valleys and near urban areas with expanding olive groves and grass- and shrublands in former complex cultivation and oak stands. We conclude that the parallel processes of abandonment of crop cultivation and intensification of livestock grazing have been less detrimental to oak woodlands than supposed. To ensure long-term persistence of oak woodlands in the face of ongoing rural depopulation and land-use intensification, environmental and agricultural policies should better address their specificities as anthropogenic habitats. [ABSTRACT FROM AUTHOR]

In this study, an overall survey regarding the determination of several bioactive compounds in olive fruit is presented. Two methodologies were developed, one UPLC-Q-TOF-MS method for the determination of olive fruit phenolic compounds and one HPLC-DAD methodology targeting the determination of pigments (chlorophylls and carotenoids), tocopherols (α-, β, -γ, δ-) and squalene. Target and suspect screening workflows were developed for the thorough fingerprinting of the phenolic fraction of olives. Both methods were validated, presenting excellent performance characteristics, and can be used as reliable tools for the monitoring of bioactive compounds in olive fruit samples. The developed methodologies were utilized to chemical characterize the fruits of the Kolovi olive variety, originating from the island of Lesvos, North Aegean Region, Greece. Twenty-five phenolic compounds were identified and quantified in Kolovi olives with verbascoside, hydroxytyrosol, oleacein and oleomissional found in significantly high concentrations. Moreover, 12 new bioactive compounds were identified in the samples using an in-house suspect database. The results of pigments analysis suggested that Kolovi variety should be characterized as low pigmentation, while the tocopherol and squalene content was relatively high compared to other olive varieties. The characterization of Kolovi olive bioactive content highlighted the high nutritional and possible economic value of the Kolovi olive fruit. [ABSTRACT FROM AUTHOR]

The assessment of seawater quality in coastal areas is an important issue as it is related to the welfare of coastal ecosystems, a prerequisite for the provision of the related ecosystem services. During the last decades, marine eutrophication has become an important problem in coastal waters as a result of nutrient inputs increase. Consequently, there is need for appropriate methods and tools to assess the eutrophication status of seawater which should be user-friendly to coastal managers and support the adoption of effective plans for the protection and sustainable development of the coastal environment. In this framework, a user-friendly webGIS application has been developed and the Strait of Mytilene at the southeastern part of the Island of Lesvos in the NE Aegean Sea, Greece, was used as a case study. The methodology includes, as a first step, the evaluation of the accuracy of spatial interpolators widely applied in oceanographic studies for assessing the spatial distribution of relevant variables. The most appropriate interpolator revealed for each variable is subsequently applied for the production of the representative thematic layer. The second step involves the integration of the information from the optimal thematic layers representing the spatial distributions of the variables under study; as a result, a new thematic layer illustrating the eutrophication status of the study area is produced. The webGIS application is fully available via a web browser and provides a number of geoprocessing modules developed in Python which implement the user interface, the application of the interpolation analytical tasks, the statistical evaluation toolset and the integration of the optimal interpolated layers. Suggestions for further improvement of the proposed webGIS application are discussed. [ABSTRACT FROM AUTHOR]

This article focuses on the development of an educational outdoor adventure mobile app while presenting findings that were derived from various case studies that we conducted using it. The mobile application, called RouteQuizer, is complemented by a web application and a database, forming a system that enables teachers to create educational treasure hunt activities for their students and monitor their performance. The aim of the research was to create a system that would exploit all possible Outdoor Adventure Education (OAE) and treasure hunt benefits while excluding possible smartphone use negative consequences. The development of the system took place in Greece and began in December 2017, by conducting a nation-wide research examining Greek secondary teachers' Information and Communication Technology (ICT) literacy and perceptions on smartphone use and outdoor activities. By June 2018, 700 questionnaires were collected. In order to test the system, in March 2018, we conducted a pilot case study in Lesvos island Greece and between July 2018 and February 2020, we conducted four additional case studies and a teacher training program, all of which took place in Lesvos island Greece. During the development process of the mobile application, we focused on the participatory aspect of the process, paying special attention to the teacher and student evaluation during the design and prototyping phases. Considering that the system is educational we research whether the mobile application provided effective learning outcomes and whether it benefited students' social and physical skills. The results that we collected suggest that the mobile application is an effective learning tool while mobile learning and treasure hunt benefits have been repeatedly confirmed during the case studies. Greek teachers and students also proved to be capable smartphone and computer users, and reported being willing to participate in similar activities in the future. [ABSTRACT FROM AUTHOR]

Extra virgin olive oil (EVOO) is an important component of the Mediterranean diet and a highly priced product. Despite the strict legislation to protect it from fraudulent practices, there is an increasing demand to characterize EVOOs and evaluate their authenticity. For this purpose, 68 monovarietal EVOOs, originating from three regions of Greece (Peloponnese, Crete, and Lesvos) and two local cultivars (Koroneiki and Kolovi), were obtained during the harvesting period of 2018–2019. Fatty acids, squalene, and tocopherols were determined chromatographically according to official methods in order to study the effect of cultivar and geographical origin. Squalene and γ-tocopherol differed significantly amongst the cultivars tested. Koroneiki samples exhibited higher squalene content than Kolovi samples, whereas the opposite was observed for γ-tocopherol. The tocopherol level was highly geographical dependent, with EVOOs from Peloponnese displaying the highest concentration of α-tocopherol, whereas the content of γ-tocopherol was significantly higher in samples from Lesvos. Unsupervised and supervised multivariate analysis resulted in a satisfactory grouping of EVOOs according to cultivar. γ-Tocopherol, squalene, and the majority of fatty acids were the most discriminant variables, with γ-tocopherol, linoleic, linolenic, and gadoleic acid being present at higher levels in samples from the Kolovi cultivar. Koroneiki samples were characterized with higher levels of squalene, palmitic, palmitoleic, and arachidic acid. [ABSTRACT FROM AUTHOR]