Lesvos Island Research Articles

Entrapped in Olive-Harvesting Nets: A Case of a Grass Snake Natrix natrix from an Olive-Growing Greek Aegean Island

Despite a recent shift towards sustainable practices to support the conservation of traditional olive groves, little is known about their potential threats to herpetofauna species. On the island of Lesvos, one of the main olive-growing islands in the Mediterranean, olive cultivation often prioritizes the expeditious harvesting of olives with minimal or no supplementary intervention, resulting in their generally suboptimal management, a component of which also pertains to the olive nets that, in many cases, remain dispersed and unfurled throughout the groves. This particular practice affects the species living in the olive groves, making them more prone to risks related to their accidental trapping. In this study, we report the first case of a Grass snake being inadvertently trapped in an olive net laid out on an olive grove. The position of the snake under the net, within a folded tipping, made it difficult for it to escape, and it became increasingly entangled. Based on this incident, it is plausible to assume that similar cases may occur in areas where nets are used in olive groves, both in Greece and other olive-growing countries. Further systematic research is necessary to determine the extent of this issue.

Necroharms: the normalisation and routinisation of social death in refugee camps on the Greek Island of Lesvos

ABSTRACT This paper explores the consequences of the necropolitical border regime on border crossers’ lives on the Greek island of Lesvos. It focuses on the manifold abandonments (left-to-die practices) that border crossers experience inside and beyond the refugee camps and detention centres, arguing that this inhuman and degrading treatment inflicts, normalises and naturalises disposability, humiliation, and social death. The paper combines a social harm approach, critical migration and border studies, and insights from anthropology to analyse border crossers’ lived experiences of violence. In doing so, the paper contributes to the growing literature on the politics of abandonment and disposability as a modus operandi of migration governance. It also expands on social harm typologies by introducing a new conceptual category of harm which I term ‘necroharms’.

Exploring the spatial patterns of soil salinity and organic carbon in agricultural areas of Lesvos Island, Greece, using geoinformation technologies

The salt-affected soils national map of Greece was recently made available within the initiative of the Global Soil Partnership (GSP) of Food and Agriculture Organization of the United Nations FAO. The present study explores the development of higher resolution soil property maps included in this national scale product adopting a modified version of the FAO methodology and a logistic regression (LR) method based on ground and satellite data. Furthermore, it also investigates the correlation between saline soils and soil organic carbon (SOC) using geospatial analysis methods. The island of Lesvos in Greece has been selected as a case study. A probabilistic model for saline soils in the agricultural land of Lesvos is produced by exploiting geoinformation technologies. As a result, the spatial distribution of saline soils in the croplands of Lesvos was obtained. Indicatively, areas with p > 0.80 for the occurrence of saline soils accounting for ∼20% of a total area of 169.51 km2 of the croplands in Lesvos. The Nagelkerke R2 coefficient showed that the probabilistic model interprets 11.3% of the variance of the dependent variable from the independent factors. The model accuracy was assessed adopting the receiver operating characteristic (ROC) curve, which showed a reasonable adaptability with area under curve (equal to 0.73). The methodological approach proposed herein can support decision-making on agricultural land protection and planning activities which are key priority today due to environmental instability, food security, and climate change.

Evidence of Mediterranean Monk Seal Predation on Loggerhead Sea Turtle in Lesvos Island, Greece

Evidence of Mediterranean Monk Seal Predation on Loggerhead Sea Turtle in Lesvos Island, Greece

Echoes of the Great Catastrophe: Re-sounding Anatolian Greekness in Diaspora

Echoes of the Great Catastrophe: Re-sounding Anatolian Greekness in Diaspora

An (Un)Expected Threat for a Regionally Near-Threatened Species: A Predation Case of a Persian Squirrel on an Insular Ecosystem

One of the most successful predators on island ecosystems is the domestic cat, which is considered responsible for the decline of numerous species' populations. This can be estimated by the analysis of cats' dietary habits, yet prey identification is not always possible, and thus, in cases where precise prey identification is required, one of the most accurate methods derives from observing the hunting process. However, the cryptic nature of the feral cats and the constant vigilance of the species that are preyed upon make the observation process difficult, especially when the prey has a low population density. Here, we report for the first time such a case: a feral cat that has ambushed, killed, and consumed a regionally near-threatened species, the Persian squirrel. This incidental observation happened in the squirrel's westernmost end of its distribution, the island of Lesvos, Greece. Due to the unexpectedness of the event, in the following days, we estimated both the squirrels' and cats' population density. Results showed that while the density of the squirrels is moderate, the population density of the feral cats is almost fifteen times higher. For this reason, management actions need to be taken in an effort to minimize the impacts of feral cats on the native species of the island.

Building Change Detection Based on a Gray-Level Co-Occurrence Matrix and Artificial Neural Networks

The recovery phase following an earthquake event is essential for urban areas with a significant number of damaged buildings. A lot of changes can take place in such a landscape within the buildings’ footprints, such as total or partial collapses, debris removal and reconstruction. Remote sensing data and methodologies can considerably contribute to site monitoring. The main objective of this paper is the change detection of the building stock in the settlement of Vrissa on Lesvos Island during the recovery phase after the catastrophic earthquake of 12 June 2017, through the analysis and processing of UAV (unmanned aerial vehicle) images and the application of Artificial Neural Networks (ANNs). More specifically, change detection of the settlement’s building stock by applying an ANN on Gray-Level Co-occurrence Matrix (GLCM) texture features of orthophotomaps acquired by UAVs was performed. For the training of the ANN, a number of GLCM texture features were defined as the independent variable, while the existence or not of structural changes in the buildings were defined as the dependent variable, assigning, respectively, the values 1 or 0 (binary classification). The ANN was trained based on the Levenberg–Marquardt algorithm, and its ability to detect changes was evaluated on the basis of the buildings’ condition, as derived from the binary classification. In conclusion, the GLCM texture feature changes in conjunction with the ANN can provide satisfactory results in predicting the structural changes of buildings with an accuracy of almost 92%.

Plant diversity of olive groves under different management practices: a case study on Lesbos Island (East Aegean area, Greece)

Plant diversity of olive groves under different management practices: a case study on Lesbos Island (East Aegean area, Greece)

Participatory approaches for planning nature-based solutions in flood vulnerable landscapes

In vulnerable areas, where floods are frequent, decision-making through participatory workshops has proved highly applicable and yielded positive results in integrated management issues. This paper examines Nature-Based Solutions (NBS) to provide flood risk mitigation and proactive adaptation options. The case study concerns the Kalloni river basin (Lesvos Island, Greece) which represents a highly flood-prone area. Participatory methods and community-based approaches according the methodology developed in "Vulnerability and Capacity Assessment (VCA)", are used to evaluate NΒS options and determine their design and implementation framework. As part of this approach, a diverse group of local stakeholders, experts and decision-makers joined a series of interviews and workshops aimed at prioritizing NBS’s proposed practices based on their sustainability at social, economic and environmental level. The small-scale mountainous dams, afforestation and planting measures appeared to be the most acceptable alternatives. After the examination of the digital elevation model and the estimated water and sediment flow, the construction sites of five gabion and three wooden wall dams in river tributaries’ bottlenecks were selected. For every selected site, the slope stability and suitable spillway, as well as the frontage and cross-section were calculated and finally their construction cost was estimated. This solution proved to be the most effective measure that provides environmental and social benefits. Ultimately, NBS strategies can drive the desired sustainable change through a combination of solutions for the wider basin resulting from a complex participatory and modeling approach, strongly depended on stakeholder’s active contribution and government intervention.

A New Invasion of the Common Slider on a Mediterranean Island (Lesvos, Greece): A Potential Threat to Native Terrapin Populations?

Island wetlands are considered crucial to biodiversity due to their unique ecological, biogeographical, and socioeconomic dynamics. However, these habitat types are particularly vulnerable to invasion; invasive species can cause severe ecological, evolutionary, and epidemiological impacts on native species. One of the most important invasive species, the common slider Trachemys scripta, an opportunistic inhabitant of freshwater habitats, has been released in multiple localities across Greece in recent years, and has expanded its range through random and unintentional releases in the Aegean islands. Since its first documented record on the island of Crete in 1998, the species has been observed on six more islands. Here, we report, for the first time, two subspecies of the common slider (T. scripta scripta and T. scripta elegans) on the wetlands of the island of Lesvos. We discuss the potential threats to native terrapins and we examine whether the introduction of this invasive species has affected native terrapins by monitoring their populations for 12 consecutive years (2010–2022). We found the common slider in 3 out of 110 wetlands surveyed. At one site, we document the presence of invasive terrapins belonging to two different subspecies. In all surveyed wetlands, we found stable populations of the two native freshwater terrapins, Mauremys rivulata and Emys orbicularis, with the first species found in much larger populations than the second. Despite these reassuring findings, the presence of this introduced species on the island of Lesvos raises serious concerns regarding its negative effects on the local terrapin populations. We propose that systematic and thorough monitoring of insular wetlands, as in the case of Lesvos, should be adopted on other islands as well, with priority on those where the common slider has been recorded.

Different responses to mega-trends in less favorable farming systems. Continuation and abandonment of farming land on the islands of Lesvos and Lemnos, Greece

Farming systems in marginal or less favored areas of Europe have faced a multitude of challenges as a response to so-called “mega-trends”. A typical response has been land abandonment. The focus of this paper is on the farming systems of the Greek islands of Lesvos and Lemnos. These neighboring islands are geographically very similar but differ greatly in their farming systems, resulting in different responses to the same megatrends. While land abandonment is widespread in the small-scale olive groves of Lesvos, on Lemnos specialization towards animal and dairy products is more common. We performed land cover analysis and interviews with farmers in both areas, in two complementing rounds: one more quantitative that recorded recent changes and farmer rationales and a more qualitative one that investigated longer term trends and decision-making patterns. The analysis revealed that, among others, land ownership and inheritance patterns matter in both areas in different ways, leading to diverse trajectories. On Lemnos, as part of the traditional mixed-farming system (Mandra), land leasing is dominant, separating land users and landowners. Interviews also reveal the different symbolic capital, as olive trees on Lesvos are considered a family asset and not just a land use, something that cannot be said of the leased grazing lands on Lemnos. The market value of the different products is important, but the different trajectories also demonstrate how the rationales behind the responses to mega-trends can guide which trajectories will be dominant in the area. This article highlights the complexity and mix of local drivers and global trends that drive abandonment at both farm and the landscape scales and guides the formulation and application of agricultural policies and public resources for improved management of marginal areas.

Investigating the effect of resin collection and detecting fungal infection in resin-tapped and non-tapped pine trees, using minimally invasive and non-invasive diagnostics

In pine stands systematic harvesting of forest products, such as resin extraction, are known to affect trees’ vitality and consequently their response to fungal diseases. The latter constitutes a serious threat for standing vigorous trees, thus early warning signals and short diagnosis time of fungal pathogens, are crucial for designing effective forest management practices. In this study, we explored the effects of the resin extraction process, which was one of the most prominent economic traditional activities throughout the Mediterranean region, on the pines’ growth, and we detected fungal presence in resin-tapped and non-tapped pine trees. For this, we obtained data from 333 resin-tapped and 163 non-tapped Pinus brutia trees, in 20 forest stands, on the island of Lesvos, Greece, by combining in-situ minimally invasive (tree coring) and non-invasive diagnostics (infrared thermography), with the trees’ phenotypic traits and indices. In each stand (30 × 30 m), tree cores were extracted from 34% of the total trees, while the fungal presence was confirmed (a) by the discoloration and decay patterns in the tree cores, (b) by external indicators of decay, such as fruiting bodies, and (c) by the sudden change in boring resistance during the tree cores’ extraction. To evaluate the effect of resin tapping on pines' growth, we developed hierarchical multiple linear regression models controlling parameters related to pines’ phenotypic traits, while for estimating the fungal presence, we used a set of logistic regression models. The results indicated that the number of tapping scars on the pines’ trunk surface, resulting from the resin extraction process, explained the decrease of (a) the average annual growth of the pines by 9.2%, (b) the annual growth after the resin extraction process by 11.7%, while the explanatory power increased to 19% in trees that were tapped early in their life. Fungal presence was successfully classified (a) in 91.5% of the resin-tapped trees, and (b) in 94.9% of the resin-tapped and non-tapped trees when combining trees’ phenotypic traits and indices with non-invasive diagnostics. These findings may contribute in monitoring forest stand dynamics in order to prevent or mitigate their degradation, and also towards effective management plans concerning resin extraction.

Healthcare Providers’ Cultural Competence from the Perspective of Newly Arrived Refugees and Asylum Seekers: A Qualitative Study in Greece

Cultural competence (CC) in the refugee context remains under-addressed in the literature. This study explores the perceptions of asylum seekers and refugees (N = 25) concerning the CC of healthcare providers. This study was conducted in 2019, on the island of Lesvos in Greece. A major finding is that, for the participants, CC means the provision of equal and human treatment and not the knowledge of culture-specific information from healthcare providers. Moreover, our findings highlight the necessity of rethinking CC in the refugee context and integrating relevant components to enhance the provision of equal treatment and ultimately end perceived or existing discrimination.

The effect of excess water on the hydrothermal carbonization of anise waste from ouzo production on Lesvos island

Beverage and food production industries are playing a major role in the local economy of Lesvos Island, with ouzo production being - by far-the most prominent one. In the framework of this present study, anise waste from ouzo production were sampled and valorized by means of hydrothermal carbonization (HTC) for the production of hydrochars. The novelty of this study is the examination of the products quality for different excess water percentages in the hydrothermal reactor. In addition, the hydrothermal treatment of anise waste is a novel and unique application. On the one hand, the analysis included the assessment of the chemical oxygen demand (COD), the total phenolic content (TPC), the pH and the conductivity of the HTC liquors. On the other hand, the higher heating value (HHV), the mass yield and the phytotoxicity were assessed for the produced hydrochars. The COD and TPC fluctuated for moderating conditions of temperature and excess water. On the one hand, reduced excess of water increased the mass yield and the HHV, while it reduced the pH values of hydrochars. On the other hand, all hydrochars had low germination index values, which is an indicator that the use of hydrochar as soil amendment is problematic and should be further investigated.

The Sound of Drystones: A Novel Hot-Spot of Ecoacoustics Research

Drystone terraces offer a series of ecosystem services including both biological and cultural benefits. The aesthetic contribution towards the landscape and the increase in biodiversity levels, constitute drystone terraces and other similar constructions, as important biocultural assets. The low maintenance and the eventual abandonment of drystone terraces cause a series of drawbacks regarding the sustainability of agricultural environments. The main goal of this research was to assess the effect of drystone terrace maintenance level on biodiversity. For that reason, two closely distant agricultural areas of Lesbos Island (North Aegean, Greece) in which olive grove drystone terraces dominate were compared. The non-intrusive method of ecoacoustics was selected, and the levels of the acoustic complexity and acoustic diversity were statistically analyzed for areas that included highly maintained and poorly maintained olive grove drystone terraces. The results indicated an increase in acoustic biodiversity levels in the poorly maintained drystone terraces area. At this early stage, the results highlighted the fact that the increased resources in the poorly maintained drystone terraces, in terms of nesting and feeding opportunities, increased the biodiversity levels. Nevertheless, the spatiotemporal expansion of this research is undeniably important.

Scale issues for geoheritage 3D mapping: The case of Lesvos Geopark, Greece

A geopark can be composed of many individual geosites of various geographical scales, thus, categorization according to cartographic scale is crucial for their 3D mapping. The UNESCO Global Geopark of the island of Lesvos in the north-east Aegean, Greece, is a distinctive example of this type of geopark as it contains many unique geosites that vary in geographical scale. The geographical scale is interconnected with the cartographic scale in which the geosite is visualized. The desired cartographic scale is an essential user requirement within an unmanned aerial vehicle's (UAVs) 3D mapping project as the basis for the data acquisition strategy. This research investigates the scale issues in 3D mapping of geosites. Furthermore, it contributes to the incorporation of the geographic and cartographical scales in association with UAV flight parameters such as Ground Sample Distance (GSD), altitude, gimbal pitch, orientation, and front and side overlapping. A total of 132 geosites located in Lesvos Geopark are being studied to determine the flight parameters of three different UAVs and their camera characteristics. The methodology followed to collect very high-resolution images suitable for 3D mapping consists of five main stages: i) determining the geographical scale of each geosite, ii) defining the cartographic scale of all geosites, iii) calculation of the GSD based on cartographic scale, iv) calculation of UAV flight altitude and flight characteristics, and v) classification of geosites based on the flight characteristics for their 3D mapping. Five geographic (G1: < 0.1 ha, G2: 0.1–1 ha, G3: 1–10 ha, G4: 10–100 ha, G5: >100 ha) and five cartographic (C1: > 1:50, C2: 1:50–1:100, C3: 1:100–1:250, C4: 1:250–1:500, C5: < 1:500) categories were defined based on the geosites' size and extent. The combination of the two scales determines the most efficient flight characteristics and optimally acquires very high-resolution images required for the 3D mapping of the selected geosites. Finally, the categorization and characteristics of flights for data collection for high-resolution 3D mapping are collected and presented in a web application. The web application is addressed to the management board of Lesvos Geopark and supports the decision-making processes on mapping geosites using UAVs.

Refugee Camps as Torturing Environments-An Analysis of the Conditions in the Moria Reception Center (Greece) Based on the Torturing Environment Scale.

Background. European countries apply a policy of deterrence of migrants in territorial and extraterritorial border areas. The authors apply the model of torturing environments, which has been already applied to other contexts where persons are deprived of liberty, to the situation of the reception center of Moria, on the island of Lesvos (Greece). Methods. A cross-sectional study was conducted in the months of April and June of 2020. Personal interviews were conducted with 160 people (80 men, 80 women) from Afghan, Syrian, Somalian, and Congo backgrounds. The authors applied the Torturing Environmental Scale, which measures interpersonal violence, emotional distress, and legal safeguards. Results. The findings confirm the inhumane living conditions for the people sheltered in Moria, documenting the severe suffering of the population due to elements linked to basic human functions (hunger, thirst, hygiene, overcrowding, temperature, etc.), actions that produce fear and distress, actions that produce helplessness and hopelessness, actions that cause physical pain, attacks on sexual integrity, and attacks on identity and the need to belong. Some of the data suggest that the purposive and intentionality elements of the definition of cruel, inhuman, or degrading treatment were also met. Conclusions. According to the conceptual model of torturing environments, the Moria reception camp constitutes a space of systematic ill treatment that vulnerated the European legal standards related to torture (Article 3 of the Human Rights Convention). The idea of torturing environments provides a valuable avenue to assess human rights violations in collective spaces and could constitute a useful tool in forensic and litigation processes.

Ammunition Waste Pollution and Preliminary Assessment of Risks to Child Health from Toxic Metals at the Greek Refugee Camp Mavrovouni.

The Mavrovouni refugee camp near the former Moria camp on the island of Lesvos, Greece, housed approximately 3000 asylum-seekers including children as of October 2021. The camp was built on the site of a military shooting range. This study aimed to characterize the soil contaminants and assess the risk of toxic environmental exposures for children living in Mavrovouni. Methods: Samples of surface soil (0–2 cm depth; particle size < 2 mm) from eight locations inside the camp were compared with two reference samples. Soil samples were microwave digested using a mixture of nitric and hydrofluoric acids and analyzed for lead (Pb), antimony (Sb), bismuth (Bi), and other metals using inductively coupled plasma mass spectrometry. These values were compared with action limits established by the Norwegian Environment Agency for kindergartens, playgrounds, and schools. Findings: Five of eight soil samples from inside the camp exceeded Pb levels of 100 mg/kg, which is currently the maximum acceptable value of Pb in soil for playgrounds in Norway. Two sites had extreme soil Pb levels of approximately 8000 mg/kg and 6000 mg/kg. The concen-tration of Sb and Bi in the surface soil of the firing range area strongly indicated environmental contamination, most likely from previous military activity and ammunition residue that has re-mained on the surface soil. Concentrations of arsenic (As), cadmium (Cd), copper (Cu), and zinc (Zn) in surface soil were lower than action limits. Discussion: Extremely high levels of Pb, together with high levels of Sb and Bi, were identified in soil where children live and play in the Mavrovouni refugee camp. This is the first independent study of environmental contamination at this camp and adds to the limited evidence base documenting Pb exposures prior to migrant and refugee reset-tlement. On top of the multiple existing public health crises and traumas that these asylum-seeking families face, exposure to toxic ammunition residues may have profound impacts on children’s development and health for years to come.

Phytochemical Composition and Cytoprotective Properties of the Endemic Sideritis sipylea Boiss Greek Species: A Valorization Study.

Sideritis sipylea Boiss. (Fam. Lamiaceae) is an endemic plant of the North Aegean Islands (Greece), commonly known as ironwort. Traditionally, its aerial parts have been used to relieve several ailments, especially gastrointestinal disorders, however, with scant knowledge about the pharmacological basis. In the present study, an endemic S. sipylea Greek species from Lesvos Island has been characterized for phytochemical composition and biological activities, in order to give a possible scientific basis to its traditional use and to highlight a further nutraceutical interest as a source of bioactive phytochemicals and extracts. Three different fractions obtained from a methanolic extract of S. sipylea aerial parts by using ethyl acetate with 10 (S10), 20 (S20), and 50% (S50) methanol as fractionation solvents were phytochemically characterized. Moreover, their antioxidant power and cytoprotective activity in different human cell lines were evaluated. The phytochemical analysis highlighted the presence of flavonoids, iridoids, and phenolic acids in all the tested samples. Particularly, the S10 fraction mainly contained iridoids, while S20 and S50 lavandulifolioside and chlorogenic acid, respectively. The fractions also showed antioxidant properties, S10 and S20 being the most potent. When assessed in human cholangiocytes, they counteracted the cytotoxicity of the tBOOH pro-oxidant agent, by reducing ROS levels and affecting GSH antioxidant system. The present findings highlight a possible interest in S10 and S20 fractions from S. sipylea as sources of bioactive molecules and stimulate further studies in order to characterize their possible application for nutraceutical and pharmaceutical purposes.

A causal model for creating public value (in institutional voids)—the case of Lesvos

The Greek island of Lesvos is a holiday destination that became the main entry point for forced migrants to Europe during 2015 and 2016. These circumstances of disruptive societal change are used as the basis for developing a causal and dynamic model that creates public value in institutional voids.The clash between a holiday location and a humanitarian-ecological disaster and the fact that volunteers were the frontline response at the border of the EU in a politically complex situation made this, at the time, a very special case. The attention of celebrities and the media, Lesvos’ geographical proximity to Turkey, the historical conflicts between the two neighbouring countries, the lack of interaction between local people and the involvement of international NGOs spurred conflicts between various actors, causing social fragmentation on the island.The model identifies the core aspects of strengthening social capital and building trust to counter such societal fragmentation. Following Archer’s morphogenetic approach as a meta-concept, and the identification of causalities for understanding the social dynamics on Lesvos as a starting point, an extended version of Moore’s public value concept was used to build the empirical basis for the development of the model.The model presented can be used to distinguish between three very separate pathways of creating public value. I call this public value (PV) outcome creation. These pathways are described separately by using causal loop diagrams (CLDs). When aligned, they suggest a causal understanding of how adaptive leadership and collaborative governance can be a core element and a generative mechanism of social change that creates public value.Although the paper draws on a case study that is relevant to migration studies, it is not a migration study, but rather an attempt to use and improve “social-theory reflection” by applying a systems thinking approach as we embark on addressing public value creation, social problems and social-systems transformation (in institutional voids).