Vicinity Of Lake Research Articles

Unstable convection flow as a controlling process of increasing salinity in the saline lake coastal aquifers: case of Maharlu Lake coastal aquifer

Deterioration of freshwater aquifers adjacent to saline lakes is a serious environmental and water resources management problem. Generally, different phenomena including saltwater intrusion, upconing, free and forced convection flow can lead to the salinization of fresh aquifers in the vicinity of saline lakes. The severity of this problem depends on hydrogeological and hydrogeochemical conditions of coastal saline lake aquifers. Accordingly, Maharlu Lake in the southeast of Shiraz plain is one of these saline lakes and has an important impact on its adjacent fresh aquifers so that the salinity of these aquifers has increased in recent years. Since the lake has special conditions such as very flat and low permeable floor and variable water level fluctuation during a year, with the onset of the rainy season after a long-term well pumping in the adjacent aquifer, the lake water covers a wide extent of the lake area in a short time. Then, because of the higher permeability of the surface of the lake in its southeast margin, conditions for convection flow are provided there. In this study, salinity distribution in one of the aquifers (Bokat aquifer) in the southeast of the lake is investigated using resistivity tomography along several profiles. Interpretation of inverse models of these profiles showed that convection flow is an important process in increasing the salinity of fresh aquifer. Comparison of the results of geo-tomography sections with convection index map of the Bokat aquifer showed that getting closer to the lake, free convection flow becomes the dominant process in the salinity distribution. In addition, in farther distances relative to the lake, due to increasing the pumping rate of the extraction wells, forced convection flow is an important process.

Mesolitiske bosættelser ved Gudenåsystemets søer og åer

Mesolitiske bosættelser ved Gudenåsystemets søer og åer

Range expansion and molecular confirmation of the Asian fish tapeworm in the lower Great Lakes and St. Lawrence River with notes on infections in baitfish

Abstract The Asian fish tapeworm, Schyzocotyle (formerly Bothriocephalus ) acheilognathi , was surveyed in fishes from the lower Great Lakes, surrounding waters, and St. Lawrence River between 2009 and 2015. Sequences of the internal transcribed spacer region (ITS1, 5.8S, ITS-2) and the barcode gene cytochrome oxidase 1 (CO1) are provided, confirming identification. Emerald shiners ( Notropis atherinoides ) collected in 2009–10 from the St. Clair River, the Detroit River, Lake Erie, the Niagara River, and Lake Ontario were infected at most localities with prevalence ranging from 1.9 to 20.0%. Infection intensity was negatively correlated with condition in these emerald shiners. Museum specimens of emerald shiners collected in 2007 from Lake Erie and vicinity also were infected at a prevalence of 5.0%. The parasite was observed for the first time in the St. Lawrence River at Beauharnois, QC, in a bluntnose minnow ( Pimephales notatus ) in June 2012. Subsequent infections in the St. Lawrence River were observed in two bluntnose minnows from Beauharnois in September 2012 and in emerald shiners from Beauharnois (prevalence = 12.0%) in June 2013, at Iles de la Paix, QC (prevalence = 6.7%) and Iles de Boucherville, QC (prevalence = 2.8%) in September 2013, and Ilet Vert, QC (prevalence = 1.8%) east of Montreal in September 2015. Samples of six other fish species from the Great Lakes, eight from surrounding small lakes and rivers, and eight species from the St. Lawrence River were uninfected. Of six species collected from six bait retailers along the north shore of Lake Erie and Lake Ontario, emerald shiners were infected at prevalences of 4.0 and 20.0% at two facilities out of six, indicating that infected baitfish have occurred in the wild at some harvest sites with sufficient prevalence to be transferred throughout the commercial supply chain. Results demonstrate that the Asian fish tapeworm has spread rapidly across the lower Great Lakes since its first observation in the Detroit River in 2002 and appears to be spreading eastward from its recent initial capture location in the St. Lawrence River.

The chemistry of river–lake systems in the context of permafrost occurrence (Mongolia, Valley of the Lakes) Part II. Spatial trends and possible sources of organic composition

The chemistry of river–lake systems located in Central Mongolia near the southern border of permafrost occurrence has not been well studied. The main aim of this paper is to summarize patterns in water chemistry in supply springs, rivers and lakes in relation to permafrost occurrence, as well as other natural and anthropogenic impacts. The analyses involved water samples taken from two river–lake systems: the Baydrag River–Böön Tsagaan Lake system and the Shargalyuut/Tuyn Rivers–Orog Lake system. Total organic carbon (TOC) and polycyclic aromatic hydrocarbons (PAHs) were detected and quantified. Other organic compounds, such as organic halogen compounds, phthalates, and higher alkanes were also noted. The main factors which influence differences in TOC concentrations in the water bodies involve permafrost occurrence, mainly because compounds are released during active layer degradation (in the upper reach of the Tuyn river), and by intensive livestock farming in river valleys and in the vicinity of lakes. In relation to the concentrations of PAHs, high variability between samples (>300ngL−1), indicates the influence of thermal water and local geology structures (e.g., volcanic and sedimentary deposits), as well as accumulation of suspended matter in lakes transported during rapid surface runoff events. The monitoring of TOC as well as individual PAHs is particularly important to future environmental studies, as they may potentially reflect the degradation of the environment. Therefore, monitoring in the Valley of the Lakes should be continued, particularly in the light of the anticipated permafrost degradation in the 21st century, in order to collect more data and be able to anticipate the response of river–lake water chemistry to changes in permafrost occurrence.

Vulnerability Assessment of saltwater intrusion using simplified GAPDIT method: a case study of Azarshahr Plain Aquifer, East Azerbaijan, Iran

The index-based method (GALDIT) has been established over the years for assessing the vulnerability of aquifers for saline water intrusion based on six parameters, i.e., groundwater occurrence, aquifer hydraulic conductivity, level of water table above the sea, distance from shore, impact of existing amplitude of saline water intrusion, and thickness of the aquifer. This method incorporates weight and the importance rating of factors to assess the vulnerable zones to saltwater. The objective of the present investigation is to simplify the GALDIT method as a procedure in vulnerability assessment of saltwater intrusion by substituting for the level of the water table above the sea with the more effective groundwater pumping rate in order to effectively represent the groundwater condition. Hence, the method is named as the GAPDIT method (“L” being replaced by “P”). The developed model was applied to a coastal aquifer in the hyper-saline lake vicinity of Urmia, Iran. The Analytic Hierarchy Process (AHP) was employed to enhance the prediction of vulnerability distribution. Thus, for every factor, a separate interpolated layer was plotted by empirical Bayesian kriging (EBK) method, and then, a final vulnerability map was derived overlaying the individual layers and their special weight application. The outcome revealed that the substituted pumping rate was justified in cases that water table data are not available and resultant maps showed reasonable correlation between the GALDIT and GAPDIT methods. Also, the derived maps revealed that the highest vulnerability exists in the northwest of the study area.

Streptomyces lonarensis sp. nov., isolated from Lonar Lake, a meteorite salt water lake in India.

A novel alkaliphilic actinomycete, strain NCL716(T), was isolated from a soil sample collected from the vicinity of Lonar Lake, an alkaline salt water meteorite lake in Buldhana district of Maharashtra State in India. The strain was characterised using a polyphasic taxonomic approach which confirmed that it belongs to the genus Streptomyces. Growth was observed over a pH range of 7-11 at 28 °C. The cell wall was found to contain LL-diaminopimelic acid and traces of meso-diaminopimelic acid. The major fatty acid components were identified as iso-C16:0 (46.8 %), C17:1 (12.4 %), anteiso-C15:0 (5.1 %) and anteiso-C17:1 (4.8 %). The major polar lipids were identified as diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylinositol. The major menaquinones were determined to be MK-9 (H6) (70.3 %), MK-9 (H4) (15.5 %) and MK-9 (H8) (7.2 %). The G+C content of the DNA of the type strain was determined to be 71.4 mol %. The 16S rRNA gene sequence has been deposited in GenBank with accession number FJ919811. Although the 16S rRNA gene sequence analysis revealed that strain NCL716(T) shares >99 % similarity with that of Streptomyces bohaiensis strain 11A07(T), DNA-DNA hybridization revealed only 33.2 ± 3.0 % relatedness between them. Moreover, these two strains can be readily distinguished by some distinct phenotypic characteristics. Hence, on the basis of phenotypic and genetic analyses, it is proposed that strain NCL716(T) represents a novel species of the genus Streptomyces, for which the name Streptomyces lonarensis sp. nov., is proposed. The type strain is NCL 716(T) (=DSM 42084(T) = MTCC 11708(T) = KCTC 39684(T)).

Geochemical Analysis of Groundwater Samples in the Vicinity of Lakes and Drainage Network

Abstract Geochemical analysis of ground water samples in the vicinity of lakes and drainage network were carried out in and around a selected set of polluted lakes in the city of Hyderabad, India for possible restoration of the polluted lakes from the state of eutrophication. The results reveal, in general the concentration of TDS and major ions higher in the down stream areas due to shallow water table as well as seepage from lakes and nalas. Further, the concentration of trace elements in ground water was found to be within the permissible limits. The Piper and Wilcox diagrams indicate that the ground water in the study area has low sodium and high salinity hazard.

Hydrogeochemical characteristics and origin of salinity in Ajabshir aquifer, East Azerbaijan, Iran

Inverse geochemical modelling with PHREEQC and multivariate statistical methods were used to determine the origin of groundwater chemical constituents and identify the source of salinity in parts of Ajabshir alluvial aquifer, East Azerbaijan, Iran. Q mode hierarchical cluster analysis (HCA) was used to partition groundwater in the study area into hydrochemical facies. Three major water groups were identified by HCA. Groundwater samples collected from the study area were classified as recharge area waters (Group 1: Na–Ca–HCO 3 water; Group 2: Ca–Na–HCO 3 water) in the northern, central and northeastern areas. Discharge area waters were identified in the vicinity of Urmia Lake and in southern parts of the study area (Group 3: Na–Cl water). Principal components analysis (PCA) with varimax rotation using the Kaiser criterion identified three principal sources of variation in the hydrochemistry. Factor 1 accounts for the salinity of the water, factor 2 represents silicate mineral weathering, and factor 3 represents calcite dissolution and incongruent silicate mineral weathering. Inverse modelling for major ions and the results of HCA confirmed the results obtained with PCA. The results of this study showed that water–rock interaction is an important mechanism in the evolution of water chemistry. The results also identified the following phenomena as important mechanisms in the composition of Group 3 waters: saline water upconing, mixing between freshwater and saline water, reverse flow from the salt flats toward the aquifer, flatness of the ground surface and very low velocity of the groundwater, shallow depth of the groundwater and evaporation from it, a silt–clay boundary at the outlet of groundwater flow from the aquifer, and airborne transport of salt particles from the salt flats.

Surface water characteristics in the vicinity of lakes and drainage network

The quality analysis of surface water from a selected set of six lakes has been carried out for major ionic as well as trace elements for three different periods. The surface water quality is within the permissible limits. Furthermore, biochemical oxygen demand (BOD) and chemical oxygen demand (COD) tests signify a relative oxygen-depletion effect and are known as a measure of pollution effect. Bimonthly variations of BOD and COD indicate high concentration in water samples and are given as bar charts. The concentration of total nitrogen (TN) and total phosphate (TP) expressed in terms of trophic status index (TSI) is a measure of water column productivity to assess water lake quality. High concentrations of BOD, COD, TN, and TP may be attributed to the urban sewage. The TSI based on TN and TP concentration of lake water and sediment samples indicate that all the six studied lakes are under hyper eutrophic condition. Classification of surface water by Piper and Wilcox diagrams indicates a high sodium and salinity hazard.

Valuation of landscape amenities: A hedonic pricing analysis of housing rents in urban, suburban and periurban Switzerland

The hedonic pricing approach has been successfully applied to estimate the economic value of environmental amenities in urban settings, but the results for landscape variables remain relatively inconsistent across studies. Here, we use national-level data and an existing typology of communities to examine how land use and environmental amenities and disamenities affect rental prices across urban, suburban, periurban, and affluent communities in Switzerland. To make the analysis and the results as transparent as possible we examine largely a priori model specifications, and we systematically report and discuss the patterns of correlation among explanatory variables. Two-level models show that about 70 percent of the price variation is found at the apartment level and about 30 percent at the community level. Models for the different community types suggest that, although we include a sophisticated variable for central services, the centrality of location is not fully controlled in our models and thus picked up by correlated peripheral and central amenities such as open space, forest or urban parks. Analysis of these correlations allows us to qualify our results and present a revised set of relatively reliable estimates. Positive effects on rental prices are identified for views, various types of recreational infrastructure and vicinity of lakes, wetlands, undisturbed areas, nationally significant landscapes and cultural sites. Negative effects are found for several disamenities including road noise, railway noise, industries and power lines. We suggest that systematic hypothesis testing and reporting of correlations may contribute to consistent explanatory patterns in hedonic pricing estimates for landscape amenities.

Water Quality Assessment of the Central Himalayan Lake, Nainital

The Nainital Lake, situated in the central Himalayas of India, is an important water body and a major tourist spot. This study aims to identify factors or processes that determine the water quality of the lake. For this purpose, water samples from two different points were collected—highly polluted (Mallital) and least polluted (Tallital)—to represent the actual level of pollution in the lake in four different seasons (January, April, July, and October). The collected samples were analyzed for different physical and chemical parameters. In order to assess the state of the lake’s water quality, the samples were compared with the standard water quality values. Turbidity, electrical conductivity, total alkalinity, and heavy metal (lead, iron, and copper) concentration were found to be above the desirable limit of the prescribed national and international standards in all four seasons at both Mallital and Tallital. Reasons affecting the water quality were found to be natural (thermal stratification and lead-bearing rocks) and anthropogenic (domestic sewage, runoff, and illegal construction activities in the vicinity of lake). Various lake restoration alternatives/interventions have been suggested that can lead to an improvement in the lake’s water quality, such as afforestation, phytoremediation, and sediment basin.

SUSTAINABLE MANAGEMENT OF LAKES IN CONNECTION WITH MITIGATION OF ADVERSE EFFECTS OF CLIMATE CHANGE, AGRICULTURE AND DEVELOPMENT OF GREEN MICRO REGIONS BASED ON RENEWABLE ENERGY PRODUCTION

Lake management is extremely complex and requires a coordinated effort of research institutions, community groups, individuals, landowners, and government. Lakes constitute an important group of natural resources due to their ecosystem services and often unique cultural environments. Climate change is a growing concern, which particularly strongly affects shallow lakes. The adverse impact of climate change is enhanced by extreme water level fluctuations and human factors such as environmental pollution from waste water discharge, large scale agriculture and shoreline constructions reducing or eliminating valuable wetlands. Since eutrophication is a leading cause of impairment of freshwater ecosystems, specific strategies to address a lake's nutrient enrichment must focus on activities in the watershed and, if needed, in-lake restoration techniques. Analyzing the key factors of sustainable local and regional development in the vicinity of lakes, assessing the environmental risks of pollution, large scale agriculture, waste management and energy production, we propose a complex, stakeholder based management system and holistic regional development in lake areas, which will preserve natural ecosystems without compromising the sustainable use of ecosystem services. There are available technologies to develop ecologically acceptable water level regulations, promote organic agriculture applying grey water irrigation, stop leachate from landfills and control invasive species. Regional and local production and use of renewable energy is essential both for environmental and economical sustainability. Renewable energy production should be well coordinated with agriculture, forestry, waste management and management of water resources of lakes and their watershed areas in a sustainable, holistic way through a participatory approach. This is particularly pronounced in connection with tourism as one of the main uses of lake-ecosystem services, but also an environmental risk for natural ecosystems when mass tourism and short-sighted profit are the driving forces.

Landscape change in central Latvia since the Iron Age: multi-proxy analysis of the vegetation impact of conflict, colonization and economic expansion during the last 2,000 years

This study represents the first detailed multi-proxy palaeoenvironmental investigation associated with a Late Iron Age lake-dwelling site in the eastern Baltic. The main objective was to reconstruct the environmental and vegetation dynamics associated with the establishment of the lake-dwelling and land-use during the last 2,000 years. A lacustrine sediment core located adjacent to a Late Iron Age lake-dwelling, medieval castle and Post-medieval manor was sampled in Lake Āraisi. The core was dated using spheroidal fly-ash particles and radiocarbon dating, and analysed in terms of pollen, non-pollen palynomorphs, diatoms, loss-on-ignition, magnetic susceptibility and element geochemistry. Associations between pollen and other proxies were statistically tested. During ad 1–700, the vicinity of Lake Āraisi was covered by forests and human activities were only small-scale with the first appearance of cereal pollen (Triticum and Secale cereale) after ad 400. The most significant changes in vegetation and environment occurred with the establishment of the lake-dwelling around ad 780 when the immediate surroundings of the lake were cleared for agriculture, and within the lake there were increased nutrient levels. The highest accumulation rates of coprophilous fungi coincide with the occupation of the lake-dwelling from ad 780–1050, indicating that parts of the dwelling functioned as byres for livestock. The conquest of tribal lands during the crusades resulted in changes to the ownership, administration and organisation of the land, but our results indicate that the form and type of agriculture and land-use continued much as it had during the preceding Late Iron Age.

Bacillus subtilis Strain VITNJ1 Potential Probiotic Bacteria in the Gut of Tilapia (Oreochromis niloticus) are Cultured in Floating Net, Maninjau Lake, West Sumatra

Tilapia (Oreochromis niloticus) is one kind of fish are cultured in floating net (KJA) Maninjau lake, West Sumatra. This study was aimed to know about proteolytic bacteria found in the gut of fish Nila can be used as candidate probiotics. Materials used in this study were derived from Nila fish farmers in the vicinity of Maninjau lake. The research method used is the isolation, identification and characterization of bacteria. Identification was conducted on the morphological and biochemical characteristics of bacteria. It was found that 55 isolates of bacteria that are morphological and biochemical grouped into three namely genus are Bacillus, Achromobacter and Enterobacter. Based on the production of extracellular proteolytic enzymes known that isolates B.3.2 had the highest proteolitic index. Based on characteristics examination and PCR analysis the isolate B.3.2 was primarily identified as Bacillus subtilis strain VITNJ1 bacteria can be used as a candidate probiotic.

A new species of the genus Taridius from China (Coleoptera: Carabidae: Lebiini)

A new species of the genus Taridius Chaudoir, 1875, T. yunnanus sp. nov. is described from the vicinity of Erhai Lake not far from Dali City, Yunnan (China).

Model reactions and natural occurrence of furans from hypersaline environments

Abstract. Volatile organic compounds like furan and its derivatives are important for atmospheric properties and reactions. In this work the known abiotic formation of furan from catechol under Fenton-like conditions with Fe3+ sulfate was revised by the use of a bispidine Fe2+ complex as a model compound for iron with well-known characteristics. While total yields were comparable to those with the Fe3+ salt, the bispidine Fe2+ complex is a better catalyst as the turnover numbers of the active iron species were higher. Additionally, the role of iron and pH is discussed in relation to furan formation from model compounds and in natural sediment and water samples collected from the Dead Sea and several salt lakes in Western Australia. Various alkylated furans and even traces of halogenated furans (3-chlorofuran and 3-bromofuran) were found in some Australian samples. 3-chlorofuran was found in three sediments and four water samples, whereas 3-bromofuran was detected in three water samples. Further, the emission of furans is compared to the abundance of several possible precursors such as isoprene and aromatic hydrocarbons as well as to the related thiophenes. It is deduced that the emissions of volatile organic compounds such as furans contribute to the formation of ultra-fine particles in the vicinity of salt lakes and are important for the local climate.

Stable vegetation and environmental conditions during the Last Glacial Maximum: New results from Lake Kotokel (Lake Baikal region, southern Siberia, Russia)

This paper presents a new decadal-resolution fossil pollen record from Lake Kotokel (52°47′N, 108°07′E, 458m a.s.l.) and provides a reconstruction of the Last Glacial Maximum (LGM) vegetation and environments in the study area during this interval of globally harsh climate. Lake Kotokel is situated close to the eastern shoreline of Lake Baikal, in the boreal forest zone of southern Siberia. The analysed 190cm long section 6 of the bottom core KTK10 (KTK10/6) consists of compact, undisturbed, greenish-grey to dark-grey, slightly laminated silty clay indicating continuous lacustrine sedimentation throughout the LGM period ca. 26.8–19.1cal.kaBP. The age model is supported by 11 calibrated AMS dates. The results of pollen analysis and pollen-based biome reconstruction show that steppe and tundra vegetation composed of grasses and various herbs dominated ca. 26.8–19.1cal.kaBP. Occurrence of conifer tracheids and stomata throughout the record, together with small quantities of boreal conifer and broadleaf tree and shrub taxa pollen, suggests the presence of single trees or small forest stands in the lake vicinity, most likely in the river valleys. Application of the biomisation method and the resulting numerical scores of the most characteristic biomes (steppe, tundra and cold deciduous forest) show minor fluctuations, signifying stability of the regional vegetation cover during the analysed LGM interval. In contrast to the regional biomes, the local environmental indicators demonstrate greater sensitivity of the lake system to decadal- and century-scale climate variability. The highest pollen percentages of Ranunculaceae, representing littoral/meadow vegetation communities, are registered ca. 23.8–23.4cal.kaBP. This and an increase in coarse-grained sand particles together with slightly increased total inorganic carbon (TIC) values representing calcite in the KTK10/6 sediment provide evidence of a much shorter than present distance between the coring site and the shoreline and a reduced lake area, in line with a drier-than-present LGM climate. A general stability of the grassland vegetation in the study region ca. 26.8–19.1cal.kaBP and relatively constant total organic carbon (TOC) values support the hypothesis that this productive vegetation could stably serve as a perennial food resource for large populations of herbivores, thus providing favourable environments for the local hunter–gatherers inhabiting the Lake Baikal region during the LGM interval.

Application of multivariate statistical methods in determining spatial changes in water quality in the Austrian part of Neusiedler See

The aim of the present study was to distinguish areas with different chemical properties in Neusiedler See, to determine which background processes are responsible for this pattern, and to discover their spatial distribution. Uni- and multivariate data analysis was applied to the data concerning 13 mainly chemical and some biological parameters for the time period 2000–2009 from 33 sampling sites. The sampling sites were first clustered then grouped. Besides reed belt and open water areas, smaller localities, which are influenced by water inputs (the treatment plant, the river Wulka, the channels of weekend houses) were also distinguished. Using Wilks’ lambda distribution it was determined that the main components (ions) have a greater effect on forming the cluster groups than those parameters which stand in close relation to biological processes. These results concurred with those obtained from the principal component analysis (PCA) conducted on the whole lake and on the groups as well. It can be stated that most of the variance in the dataset can be explained by the main components (ions). The spatial distribution of the principal component scores was visualized with isoline maps. The results of this research lead us to the view that Neusiedler See cannot be treated as one homogeneous system. This exceptional variability originates from the lake's shallow water depth, its unstable water balance, and anthropogenic activity (agriculture, tourism, sewage treatment) in the lake's vicinity.

The Holocene deposits of Lake Petit (2200 m a.s.l., Southern French Alps): climatic and anthropogenic controls on mountain sediment dynamics?

Numerous archaeological studies carried out in high-elevation areas of the Southern French Alps have documented ancient human occupation of mountains, mainly characterized by pastoral and mining activities. Besides, the area was affected by both continental and Mediterranean climate instability throughout the Holocene. Lake Petit, located in the Mercantour massif, was investigated in order to reconstruct past interactions between humans, the environment and climate, using a multidisciplinary approach. This study was carried out on a 144 cm-long gravity core providing a continuous record spanning the last 5000 years. Our multi-proxy investigation (sedimentological, geochemical and palynological analyses), allowed us to reconstruct three main phases, evidencing a progressive destabilization of the local environment. The first phase (ca. 4800 to 4300 cal. BP) was characterized by relatively stable environmental conditions, as attested by a high lake productivity (deposition of pure diatomite) and by the local presence of trees (presence of conifer stomata). The second phase (ca. 4300 to 1500 cal. BP) could correspond to a drastic cleaning of landscapes since the lake record highlights an abrupt switch in sediment source marked by an input of terrestrial organic matter. Regular occurrences of anthropogenic pollen assemblages might indicate early pastoral activity in the lake vicinity, while wetter conditions characteristic of the Neoglacial period may have trigger hillslopes destabilization. The most recent phase (since ca. 1500 cal. BP) is marked by a final degradation of the environment: the lake productivity dramatically decreased contemporaneously with a fall of the AP/NAP pollen curve. This phase also exhibits the highest values of anthropogenic pollen taxa and concentrations of lead. It undoubtedly corresponded to one of an intensive agro-pastoral pressure as well to local mining activities.

Vegetation history of central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater

Abstract. Frozen sediments from three cores bored in the permafrost surrounding the El'gygytgyn Impact Crater Lake have been studied for pollen, non-pollen palynomorphs, plant macrofossils and rhizopods. The palynological study of these cores contributes to a higher resolution of time intervals presented in a poor temporal resolution in the lacustrine sediments; namely the Allerød and succeeding periods. Moreover, the permafrost records better reflect local environmental changes, allowing a more reliable reconstruction of the local paleoenvironments. The new data confirm that shrub tundra with dwarf birch, shrub alder and willow dominated the lake surroundings during the Allerød warming. Younger Dryas pollen assemblages reflect abrupt changes to grass-sedge-herb dominated environments reflecting significantly drier and cooler climate. Low shrub tundra with dwarf birch and willow dominate the lake vicinity at the onset of the Holocene. The find of larch seeds indicate its local presence around 11 000 cal yr BP and, thus a northward shift of treeline by about 100 km during the early Holocene thermal optimum. Forest tundra with larch and shrub alder stands grew in the area during the early Holocene. After ca. 3500 cal yr BP similar-to-modern plant communities became common in the lake vicinity.