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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]

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]

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]

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]

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]

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]