Publications
Three million ringed birds on the Curonian Spit (Baltic area) and ten thousand results on their migration routes: a brief overview, statistics and examples
Over six decades of bird ringing on the Curonian Spit, spanning from 1956 to 2020, has yielded unprecedented data, with 3.2 million birds from 202 species ringed and over 10,000 reports of distant recoveries for 99 species. This extensive dataset provides critical insights into migration routes along the White Sea-Baltic flyway, revealing patterns in migratory connectivity, population dynamics, and demographic trends. Despite its significance, this research was notably excluded from the Eurasian-African Bird Migration Atlas due to non-scientific reasons. The study highlights the effectiveness of ringing as a tool for tracking long-distance migrants while also addressing challenges such as declining recovery rates. It underscores the importance of long-term monitoring in understanding migratory behavior and population changes.
About typical and anomalous modes of sea water cooling in a coastal zone of the Curonian spit
Researchers have identified distinct cooling patterns of seawater along the Curonian Spit, revealing both typical and anomalous regimes influenced by coastal dynamics. The study highlights how wind-driven processes, such as upwelling and mixing, can lead to rapid temperature drops, particularly in shallow nearshore areas. Using a combination of field measurements, satellite data, and numerical modeling, the team analyzed thermal variability over multiple seasons, uncovering mechanisms that deviate from expected cooling trends. These findings contribute to understanding coastal climate resilience and may inform conservation strategies for this UNESCO World Heritage Site.
Avian malaria parasites (Haemosporida: Plasmodiidae) in mosquitoes (Diptera: Culicidae) of the Curonian Spit (South-East coast of the Baltic Sea)
Research on the Curonian Spit reveals that Culex pipiens mosquitoes are competent vectors for avian malaria parasites, specifically Plasmodium relictum (genetic lineages pGRW11 and pSGS1), and potentially for Plasmodium vaughani (pSYAT05). This finding sheds light on the transmission dynamics of avian haemosporidian parasites in Europe, where knowledge about vector species remains limited. The study employed a combination of morphological identification, PCR analysis, and dissection of mosquito salivary glands to detect sporozoites, confirming the role of Culex pipiens as a significant carrier in this region.
The Study of Biting Midges Culicoides Latreille, 1809 (Diptera: Ceratopogonidae) and the Prevalence of Haemoproteus Kruse, 1890 (Haemosporida: Haemoproteidae) on the Curonian Spit of the Baltic Sea
Research on the Curonian Spit reveals that biting midges of the genus Culicoides are competent vectors for avian haemosporidian parasites, particularly Haemoproteus. The study identified 12 species of Culicoides, with C. kibunensis and C. pictipennis being dominant. Molecular analysis detected Haemoproteus DNA in 2.71% of midges, belonging to six genetic lineages, including H. parabelopolskyi hSYAT02, which was found in sporozoite form in two midge species. The findings suggest that these midges play a significant role in transmitting Haemoproteus parasites among birds on the Spit. The study employed light traps for midge collection and combined microscopic examination with PCR analysis to assess infection prevalence and genetic diversity.
A new species of Ornithomya Latreille, 1802 (Diptera: Hippoboscidae) from the Curonian Spit (Russia)
Researchers have identified a new species of louse fly, Ornithomya krivolutskii, from the Curonian Spit in Russia. This discovery distinguishes it from related species through unique morphological traits, including body size, head and thorax length, scutellum setae count, and wing microtrichia patterns. The study provides an updated identification key for Ornithomya species found in Russia, aiding in future taxonomic research. The Curonian Spit serves as a critical ecosystem for biodiversity studies.
Analysis of Interannual and Seasonal Nearshore Bar Behaviour Observed from Decadal Optical Satellite Data in the Curonian Spit, Baltic Sea
A novel analysis of nearshore bar dynamics on the Curonian Spit reveals cyclic offshore migration with return periods ranging from 1.8 to 13.5 years—a first for this region. Using decadal optical satellite data (2011–2021), researchers quantified interannual and seasonal bar movements, finding offshore migration rates up to 9.7 meters per month and onshore rates up to 11 meters per month. Seasonal variability showed bars migrating faster during high wave energy (up to 12.9 m/month offshore) compared to low-energy periods. Clustering analysis identified regions with similar bar behavior, linking local hydrodynamics—wave climate and shoreline orientation—to morphological variability. The study demonstrates the potential of satellite-derived data for long-term coastal monitoring, offering insights critical for managing this dynamic UNESCO site.
Curonian Spit Coastal Dunes Landscape: Climate Driven Change Calls for the Management Optimization
Climate-driven changes on the Curonian Spit are accelerating vegetation overgrowth, threatening the survival of open-sand ecosystems—a priority habitat under EU protection. The study reveals significant hydroclimatic shifts, including rising temperatures, altered precipitation patterns, and sea-level changes, which have intensified succession trends in herbaceous ecosystems. To preserve mobile dunes, management strategies must prioritize tools like grazing while balancing biodiversity conservation with aesthetic ecosystem services. Researchers analyzed decades of phenological data (NDVI from MODIS, 2000–2020) alongside hydroclimatic and ecological patterns to inform adaptive policies.
Pseudoscorpions (Arachnida: Pseudoscorpiones) from the Curonian Spit National Park with Dinocheirus panzeri as a newly recorded genus and species from Lithuania
Researchers have identified Dinocheirus panzeri as a newly recorded genus and species of pseudoscorpion in Lithuania, specifically within the Curonian Spit National Park. This discovery adds to the biodiversity documentation of the region, highlighting its ecological significance. The study collected 102 pseudoscorpions from five species across four genera and two families, employing field sampling techniques to analyze their distribution and diversity. This finding contributes valuable data for conservation efforts and expands the known range of Dinocheirus panzeri, which was previously unrecorded in Lithuania.
The Fauna and Ecology of Thrips (Thysanoptera) in the Southern Part of the Curonian Spit in the Baltic Sea, Russia
A comprehensive survey of thrips (Thysanoptera) species diversity on the southern Curonian Spit identified 35 species across 18 genera and 3 families. Notably, five species—Drepanothrips reuteri, Rubiothrips silvarum, Thrips linariae, Bolothrips dentipes, and Haplothrips arenarius—were previously undocumented in Kaliningrad Province, with three of these (Anaphothrips badius, D. reuteri, and H. arenarius) deemed rare enough to warrant inclusion in protected species lists for eastern Poland. The study also revealed that Thrips tabaci, the most common species, exhibits hydrophobic tendencies, avoiding moist habitats like raised bogs and near-water vegetation. This research contributes critical baseline data on thrips ecology across diverse habitats (e.g., pine stands, dunes) while highlighting regional biodiversity patterns and conservation priorities in this ecologically significant region.
‘Silencing’ the border as a strategy to conceal the ‘other’ side: the case of the Curonian Spit
Borders do not need to be overtly visible to remain effective, yet their subtle manifestations and the lack of cross-border coordination can paradoxically reveal more about them. This study highlights a hybrid border management strategy—'silencing' the border—to conceal the 'other side,' using the Curonian Spit (Russia–Lithuania) as a case study. Through a mixed-method approach, particularly leveraging visual data and local narratives, it demonstrates how the absence of coordinated landscape and heritage management on both sides of the border renders it latent in the environment while also concealing the adjacent territory. This challenges conventional understandings of border hybridity, shedding light on its spatial impact and influence on borderland inhabitants.
Developing geotourism with a focus on geoheritage in a transboundary region: the case of the Curonian Spit, a UNESCO site
A new approach to geotourism in UNESCO World Heritage Sites, exemplified by the Curonian Spit, demonstrates how geological and geomorphological heritage can be integrated into sustainable tourism. The research introduces an innovative algorithm for designing eco-educational routes that balance conservation with recreation, addressing the growing tension between environmental protection and economic use of protected areas. This methodology, developed through international collaboration (Ecotour4Natur project), proposes a transboundary tourist route—'The Geological and Geomorphological Chronicle of the Baltic Sea'—which highlights the unique landscapes shaped by human-nature interactions over centuries. The study provides a scalable model for other national parks, offering insights into diversifying ecotourism while preserving geoheritage.
Natural Features and Anthropogenic Factors of the Curonian Spit Ecosystem Formation
The Curonian Spit, a UNESCO World Heritage Site and National Park, owes its unique eolian coastal-marine landscape to the interplay of Baltic Sea sea level fluctuations and wind activity. By the end of the 18th century, anthropogenic pressures had devastated its vegetation cover, transforming it into a sandy desert. However, concerted nature conservation efforts have since restored the spit's cultural landscape. This study highlights the historical dynamics shaping the Curonian Spit, emphasizing natural forces and human impacts on its ecosystem formation. It provides insights into the modern landscape structure while underscoring the significance of conservation measures in preserving this fragile environment.
Nearshore sandbar switching episodes and their relationship with coastal erosion at the Curonian Spit, Baltic Sea
Nearshore sandbar switching episodes significantly accelerate coastal erosion on the Curonian Spit, Baltic Sea. The study identified 27 such events, averaging 14.3 months, often occurring at specific locations where oblique waves and longshore currents dominate. During these episodes, shoreline retreat averaged -14.2 meters annually, with storm-related erosion rates within switching zones exceeding those outside by a substantial margin. Interannual analysis revealed moderate erosion in switching zones compared to accretion elsewhere. The research highlights the correlation between sandbar dynamics and beach-foredune evolution, emphasizing its potential for predicting erosional hot spots and informing coastal management strategies.
New genetically distinct phytoplasmas and insect carriers associated with pine tree disease revealed by a survey in the Curonian Spit, Lithuania
Researchers have identified three new genetically distinct phytoplasma subgroups associated with pine tree disease on the Curonian Spit, Lithuania. These subgroups—16SrXXI-C, 16SrXXI-D, and 16SrXXI-E—were discovered through a survey of phloem-feeding insects, primarily aphids, collected from diseased pine trees between 2016 and 2019. The study used semi-nested PCR and sequence analysis to detect phytoplasmas in Scots pine aphids (Cinara pini) and waxy grey pine needle aphids (Cinara pineti), revealing that the dominant strains matched those found in diseased trees, primarily 16SrXXI-A variants. No known phytoplasma vectors were identified among the 98.62% aphid population sampled. Further transmission trials are planned to elucidate the epidemiology and potential vectors of pine phytoplasma diseases, offering insights for disease management in this UNESCO World Heritage Site.
Ore Sands in Curonian Spit Sediments (Baltic Sea)
A novel study reveals the presence of ore sands on the beaches of the Curonian Spit, formed by storm waves and winds in the Baltic Sea and the more sheltered Curonian Lagoon. The research identifies the mineral composition and traces their origins, providing insights into sediment dynamics under varying environmental conditions. This first-of-its-kind analysis highlights the practical significance of ore content in coastal sediments while also contributing to theoretical understanding. The findings suggest that such deposits could have implications for both resource management and studies of sediment transport in transitional marine environments.
Problems of Creating a Unifed Legal Regime for Cross-Border Specially Protected Natural Territories on the Example of the Curonian Spit
A unified legal framework for cross-border protected natural areas remains elusive, as demonstrated by the challenges faced in establishing consistent regulations for the Curonian Spit—a UNESCO World Heritage Site straddling Lithuania and Russia. The study identifies key obstacles, including jurisdictional conflicts, differing national priorities, and gaps in international cooperation. Researchers analyzed existing legal instruments, comparing national laws with cross-border agreements to assess their effectiveness. Findings highlight the need for stronger institutional coordination, harmonized environmental standards, and enhanced transnational governance mechanisms to ensure coherent protection of such fragile ecosystems.
Beach-Foredune Sediment Budget Response to Sea Level Fluctuation. Curonian Spit, Lithuania
A decade-long study on the Curonian Spit, Lithuania, reveals that short-term sea level fluctuations primarily affect beach sediment budgets without significantly impacting foredune development. Despite variations in beach sediment volumes due to changing sea levels, the foredune sediment budget remained positive regardless of whether beach sediment increased or decreased. The research, based on annual cross-shore profile measurements from 2002 to 2019, found no strong year-to-year relationship between sea level changes and foredune sediment budgets, nor between foredune and beach sediment budgets. This suggests that while beaches respond dynamically to sea level fluctuations, foredunes maintain stability on a decadal scale even with minimal sand surplus.
Impact of Hydro-Climatic Changes on Coastal Dunes Landscape According to Normalized Difference Vegetation Index (The Case Study of Curonian Spit)
Research on the Curonian Spit reveals that the Normalized Difference Vegetation Index (NDVI) serves as a reliable indicator for monitoring coastal dune dynamics, showing strong correlations with hydro-climatic factors. The study found moderate to strong positive correlations between NDVI and average wind speed in non-forested ecosystems, as well as between NDVI and Baltic Sea water levels across all studied ecosystems. Additionally, a moderate positive correlation was observed between NDVI and air temperature in forest ecosystems. These findings suggest that NDVI can effectively track the balance between dune overgrowth and open dune formation, providing valuable insights for coastal management strategies amid climate change.
Preliminary data on formation and depositional environments of lake Chaika in the central part of the Curonian Spit (Kaliningrad region, Russia, South-Eastern Baltic)
Lake Chaika, the sole major water body within the sand barriers of the South-Eastern Baltic shoreline, was formed around 500 years ago. This discovery challenges previous assumptions about its origin and provides insights into the region's environmental history. The study, conducted by Napreenko et al., employed a combination of sediment core analysis, organic matter content assessment, macrofossil examination, radiocarbon AMS-dating, and bathymetric surveys to unravel the lake's formation phases. It revealed that the lake's kettle was not submerged during the Littorina transgressions and experienced three distinct ecosystem phases: a period of alder carrs (5390–510 cal. yr BP), a 'sand disaster' phase (≈550–500 cal. yr BP), and its current lake stage (500 cal. yr BP to present). Notably, the 'sand disaster' began 200-250 years earlier in this region compared to the main Curonian Spit territory.
Vegetation cover dynamics mapping of the curonian spit national park using ALOS and SENTINEL-2 satellite imagery
Between 2007 and 2017, the Curonian Spit National Park experienced contrasting vegetation dynamics on its lagoon and sea sides. While forest cover expanded and sand stabilization increased along the lagoon due to protective measures, sea-side foredunes eroded under wind, wave, and recreational pressure, reducing forest area and increasing exposed sands. High-resolution ALOS and Sentinel-2 satellite imagery, combined with automated classification algorithms (Random Forest and Maximum Likelihood Estimation), enabled precise mapping of these changes. The study quantified key ecosystem indicators—forest cover percentage, coniferous tree share, waving sand extent, and vegetation-fixed sand coverage—revealing critical shifts in park structure over a decade.
Key Aesthetic Appeal Concepts of Coastal Dunes and Forests on the Example of the Curonian Spit (Lithuania)
Aesthetic appeal of coastal dunes and forests on the Curonian Spit varies significantly among visitors, local inhabitants, and experts. The most appealing landscapes include white mobile dunes and combinations of white and grey (grassland) dunes, with visual coherence being a key factor for locals. Experts, however, emphasized stewardship, naturalness, imageability, and visual scale as defining scenic appeal, while disturbance and complexity diminished attractiveness. This divergence in perceptions suggests potential management conflicts. The study used paired comparison surveys of 45 landscapes, semi-structured interviews with locals, and a Delphi technique involving experts to elicit key aesthetic concepts.
Eutrophication and effects of algal bloom in the south–western part of the Curonian Lagoon alongside the Curonian Spit
Intensive algal blooms, particularly Cyanobacteria hyperblooms, are a persistent issue in the south-western part of the Curonian Lagoon, driven by high mineral nitrogen and phosphorus ratios. These blooms, occurring from July to October, lead to significant environmental impacts such as increased ammonia nitrogen levels, pH, and BOD5, exceeding thresholds for fishery waters. Over six years (2008–2016), chlorophyll a concentrations consistently reached hyperbloom states (>100 μg/l), causing localized oxygen deficits and fish mortality due to algal accumulation and decomposition. Water temperature emerged as a key factor influencing seasonal and long-term variability in phytoplankton abundance, thereby shaping eutrophication levels in the lagoon. The study analyzed data from four sampling points near the Curonian Spit, providing critical insights into the ecological consequences of eutrophication in this UNESCO-listed coastal lagoon.
Laelapidae mites (Acari: Mesostigmata) infesting small rodents in the Curonian Spit, Lithuania
Researchers identified five species of Laelapidae mites—Laelaps agilis, Hyperlaelaps microti, Haemogamassus nidi, Eulaelaps stabularis, and Myonyssus gigas—as parasites infesting small rodents in the Curonian Spit, Lithuania. This marks the first detection of these mites in the region, contributing to the understanding of their ecological diversity and host associations. The study analyzed 236 small rodents, including yellow-necked mice (Apodemus flavicollis), harvest mice (Micromys minutus), bank voles (Myodes glareolus), root voles (Microtus oeconomus), and field voles (Microtus agrestis), collected between 2013 and 2014. Mite species were determined through morphological analysis of adult females and males, providing new insights into their distribution and potential ecological roles in this UNESCO World Heritage Site.
Genesis, distribution and dynamics of lagoon marl extrusions along the Curonian Spit, southeast Baltic Coast
A unique geological process involving the extrusion of lagoon marl from beneath massive migrating sand dunes characterizes large segments of the Curonian Spit, a 100-km-long sandy barrier separating the Curonian Lagoon from the Baltic Sea. This study reveals that relict lagoon marl, composed of Holocene organic sediments like gyttja and clayey gyttja, was deformed, compacted, and dehydrated by landward-migrating dunes during the Littorina Sea transgression—a phenomenon termed 'dune tectonics.' Using advanced techniques such as side-scan sonar, multibeam echosounder, seismic imaging, sediment sampling, and video observations, researchers identified extensive underwater marl outcrops at depths of 5–15 m along the southern half of the spit. Spatial analysis further constrained the southeastward migration rates of the dune massif. A conceptual model explains both onshore marl exposures above the regional water table and offshore relict marl diapirs, offering new insights into the dynamic interplay between coastal geomorphology and sedimentary processes in this UNESCO World Heritage Site.
A national discovery and loss of a landscape – photographic images of the Curonian Spit
The Curonian Spit, a historic and culturally significant landscape divided between Lithuania and the Kaliningrad Oblast (Russia), has been transformed from a symbol of national discovery to one of loss in collective memory. This shift is evident through photographic representations in popular Bildbände (photographic books) from 1930s to 1960s, which captured the landscape's iconic status during its heyday as part of East Prussia. The study reveals how these visual and textual depictions shaped perceptions, ultimately framing the region as a lost territory in post-World War II narratives. By analyzing archival photographic materials, the research explores the evolution of this landscape's imagery, highlighting its enduring cultural significance despite geopolitical changes.
Molecular Identification of Phytoplasmas Infecting Diseased Pine Trees in the UNESCO-Protected Curonian Spit of Lithuania
A large-scale infection of pine trees by phytoplasmas, particularly Candidatus (Ca.) Phytoplasma pini-related strains, has been documented for the first time in Lithuania. This discovery challenges the conventional understanding that phytoplasmas primarily affect angiosperms and expands their known host range to include coniferous plants like Scots pine (Pinus sylvestris) and mountain pine (Pinus mugo). The study, conducted between 2008–2014 in the UNESCO-Protected Curonian Spit and Southern Lithuania, identified phytoplasma infections in nearly 300 trees, with 80% testing positive. Molecular analysis using RFLP and nucleotide sequencing of the 16S rRNA gene revealed that 98% of infected samples belonged to Ca. Phytoplasma pini-related strains (subgroup 16SrXXI-A), while a small fraction were associated with Ca. Phytoplasma asteris-related strains (subgroup 16SrI-A). This is the first report of subgroup 16SrI-A in pine trees, highlighting its potential broader geographic distribution and ecological impact on coniferous forests.
Reconstruction of the Dead (Grey) Dune evolution along the Curonian Spit, Southeastern Baltic
Researchers have reconstructed the evolutionary history of the Dead (Grey) Dunes, a significant geological feature on the Lithuanian half of the UNESCO-listed Curonian Spit. Using advanced geophysical and geochronological techniques—including ground-penetrating radar (GPR), LiDAR data, and radiocarbon dating—the study identified four distinct phases of dune formation spanning from 5800 to 4500, 3900–3100, 2600–2400 calendar years BP, and the modern period. These findings reveal the dynamic nature of this aeolian environment, offering new insights into its paleogeographic development over millennia.
Hindcast of sediment flow along the Curonian Spit under different wave climates
A rotation of wave approach direction by more than 10 degrees could lead to the complete disappearance of convergence points of sediment flow along the Curonian Spit, potentially causing substantial coastal damage. The study analyzed longshore sediment transport under existing and future wave climates using the CERC formula, based on numerically simulated long-term time series of wave properties from 1970–2007. While the spit is currently in an almost perfect equilibrium shape, systematic rotation of wave approach directions showed a linear increase in net transport rate, though bulk transport rates would remain largely unchanged.
Detection of Babesia Sp. EU1 and Members of Spotted Fever Group Rickettsiae in Ticks Collected from Migratory Birds at Curonian Spit, North-Western Russia
A groundbreaking study on the Curonian Spit reveals that migratory birds may serve as reservoirs for human pathogens. Researchers detected Babesia sp. EU1 and spotted fever group (SFG) rickettsiae in ticks collected from passerine birds, marking the first such findings in this region. Using PCR analysis, 1.6% of ticks tested positive for Babesia spp., with sequences matching human pathogenic strains, while 15.1% carried SFG rickettsiae, including Rickettsia helvetica, monacensis, and japonica. This suggests a potential role for migratory birds in the epidemiology of these diseases, warranting further investigation into their transmission dynamics.
Ectomycorrhizal fungal communities on seedlings and conspecific trees of Pinus mugo grown on the coastal dunes of the Curonian Spit in Lithuania
A study on the Curonian Spit, Lithuania, reveals that Pinus mugo, a non-native tree species thriving in harsh coastal dunes, forms ectomycorrhizal (ECM) associations with a low but consistent fungal diversity. Molecular analysis identified 12 ECM taxa across three study sites, with Cenococcum geophilum dominating both seedlings and mature trees, though more abundantly on seedlings. Shannon's diversity indices indicated slightly higher diversity in mature trees. While mycorrhizal communities were similar across sites, subtle differences emerged between seedlings and mature trees. The study also highlighted discrepancies between below-ground ECM diversity and aboveground fruiting body surveys, emphasizing the need for comprehensive sampling methods to accurately assess fungal symbionts. These findings suggest P. mugo's adaptability in distinct habitats, supported by a stable suite of ECM symbionts that facilitate growth and natural regeneration.
Heritage And The Making Of (Trans-)Local Identities: A Case Study From The Curonian Spit (Lithuania)
Heritage production on the Curonian Spit reflects shifting political ideologies and trans-local identity formation. During Nazi rule, Curonian heritage was framed through national-socialist narratives, while Soviet governance recontextualized it under socialist ideology, effectively Lithuanianizing local history despite demographic upheavals post-World War II. The study demonstrates how heritage discourse serves as a tool for constructing and legitimizing political affiliations, particularly in regions with fluid national boundaries. By analyzing historical documentation and local narratives, the research highlights the tension between authentic cultural preservation and state-driven reinterpretation, offering insights into the malleability of heritage under authoritarian regimes.
Transboundary governance of the Curonian Spit World Heritage Site
Effective transboundary governance of the Curonian Spit World Heritage Site is hindered by divergent national priorities and insufficient stakeholder inclusion, despite its shared management between Lithuania and Russia. The study reveals that strong state-level influence and lack of local community engagement create challenges to cooperative efforts. To overcome these obstacles, the research advocates for stronger state-level coordination and full integration of local stakeholders, suggesting that adherence to environmental governance principles could mitigate conflicts and enhance collaborative outcomes.
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