Caspian Journal of Environmental Sciences
Volume:19 Issue: 3, Summer 2021

Knowledge of the effects of trace element accumulations in fish tissues on consumer health is of great importance. Concentration of trace elements (Hg, Pb, Cr, Cd, As, Fe, Zn, Mn, Co, Cu, Ni, Al, Sn, Ti, V) were determined in muscle of Liza aurata, wild fish caught from the southern coasts of the Caspian Sea in 2014 and 2015 in order to understand the accumulation pattern of trace elements in this fish and to assess the potential health risk posed by fish consumption. Following the standard instructions, the preparation and chemical digestion of the samples were performed using an atomic absorption spectrophotometer (AAS). The highest and lowest accumulations in the muscle belonged to Fe and V (13.988 ± 3.4 and 0.0009 ± 0.00079 µg g-1 wet weight) respectively. The accumulations of these elements were lower than the permissible range proposed by the WHO for human consumption. Results showed that element accumulations were not affected by sex. Negative correlation coefficients were found between Pb, Cd, As, Zn, Al, Cu, Mn and V levels in the tissues and the fish weight and total length. Moreover, in this study, the value of the hazard index (HI) was calculated to be 0.065. Estimated daily intakes (EDIs) of the elements were in the range of 0.0045 to 7.5934 for adults, and 0.021 to 36.675 for children, while the target hazard quotients (THQ) was below 1.0 for each element. These results exhibit that the consumption of the investigated L. aurata from the southern coasts of the Caspian Sea does not cause significant adverse health effects. However, some considerations should be observed regarding the consumption of fish by infants and pregnant women.

The Persian oak, Quercus brantii trees and to a lesser extent, man-mad plantations in the Zagros region of western Iran have been in decline since 2000. The decline is assumed to be partially connected with invasions of dust and particulate materials created in neighboring countries. We measured rainfall interception (I) and quantified the amount and size of dust and particulate material (PM) deposited on leaves of Q. brantii as well as Pinus brutia and Cupressus arizonica man-made trees after rainfall (GR) leaching. Throughfall (TF) was measured using the sixteen rain gauges randomly located under the crown of individual species. GR was measured using rain gauges fixed in an open field nearby to the species and I was computed as the difference between GR and TF. Seven and three GR events and corresponding collected TF were centrifuged and dried out to measure the amount and size of intercepted PM by the species, respectively. Fifteen GR events occurred during the study period (cumulative GR: 128.9 mm). The mean ratio of I to GR equaled 35% for Q. brantii against 53% for P. brutia and 45% for C. arizonica. We found out that mean rainfall event (7.83 mm) during the measurement period was able to wash off PM content by 3.6, 6, and 6.8 mg per square meter of crown projected area (CPA) for Q. brantii, P. brutia, and C. arizonica, respectively. The ratio of PMs smaller than 5 µm was lower in TFs (mean: 15.4% for all species) compared to open field 27.2%. All species presented approximately the same potential for PM absorption. P. brutia and C. arizonica were capable of absorbing larger PMs compared to Q. brantii. The results showed that exotic species demonstrated satisfactory potentials in absorbing particulate material nevertheless their higher interception capacity should be considered while they are recommended for afforestation in the semi-arid climate of the Zagros region.

The objective was to investigate the detailed information about proximate, fatty acid compositions and lipid quality indices in the caviar of wild and farmed beluga, Huso huso from Iran. The fatty acid composition varied with origin of caviars, although did no differ in proximate compositions. The most notable difference (P<0.05) was the higher concentration of linoleic acid (C18:2n-6) in farmed beluga caviar (8.32%) than in wild ones (0.37%). The amounts of docosahexaenoic acid (C22:6n-3) in wild and farmed caviars (23.88% and 23.75% respectively) were not different (P>0.05). There were significantly differences between samples in the amount of eicosapentaenoic (C20:5n-3), arachidonic (C20:4n-6) and docosapentaenoic (C22:5n-3) acids (P<0.05). The total ω-3 in wild and farmed caviars were 38.42% and 30.42% (P>0.05). Total ω-6 was higher in farmed samples (P<0.05). The ratio of ω-3/ω-6 was higher in wild (2.90) than in farmed (1.75) samples (P<0.05). It was also true for, AI content (0.29 and 0.28) and TI (0.18 and 0.21) and also PI content (1.73 and  1.46) respectively, however the differences were not significant (P>0.05). The present study indicated that, fatty acids profile in beluga caviars can be used as an index to determine fish origin and diet. Also farmed beluga caviar has good balanced with lipid quality indices to decrease the potential risk of coronary heart diseases and like wild ones could be considered as a good food sources.

Poplar clearwing moth Paranthrene tabaniformis Rott. (Lep.: Sessiidae) is considered as one of the major obstacles affecting the poplar seedlings in nurseries and poplar stands in Iran. In this study, the antixenosis resistance of 12 poplar clones have been studied at Fakhr-Abad Agricultural Research Station in Guilan Province, Iran. This resistance factor was based on the establishment and population density of poplar clearwing moth on the clones in natural conditions. For this purpose, 20 cm-cuttings of the examined species were planted in 9 m2 area plots (three rows with a distance of 1.5 m from each other) at intervals of 20 cm from each other (15 cuttings in each planting row and 45 cuttings in the plot in total) in a randomized complete block design, with three replications. Manuring was performed only once with thrice weeding operations during the growing season (spring 2019). The percentage of infestations by poplar clearwing moth larvae on seedlings and the damage intensity (number of galls formed in each seedling) were recorded. The data were normalized using Kolmogorov-Smirnov test. The results showed a significant differences in the severity of infestation and the number of galls formed among various clones. The Populus euramericana Blanc du poitou and P. x. ITA.199 are reported as the most sensitive clones to the pest by 87.8% and 83.97% of infestation respectively.  Also, P. deltoides 77/51 (known locally as Gildar) and P. x. interamericana by 44.7 % and 51.15% of infestation are considered as the most resistant clones to poplar clearwing moth pest. According to the present findings, the P. x. interamericana and P. deltoides 77/51 clones are suggested for propagation in northern Iran conditions as far as this insect pest is concerned.

In the context of the current policy of sustainable management of water resources, the forecasting of pollution risks and the protection of these resources are of paramount importance. For this purpose, the quality of these resources must be safeguarded in the medium and long term. Industrial development in Morocco has made this situation worrying for all socio-economic actors. In recent years, this economic growth has been marked by the establishment of slaughterhouses that discharge their liquid waste into watercourses or sewage networks. These discharges are likely to destabilize the environmental balance in the years to come, hence the need to take responsibility for treating all sources of pollution. The clean-up of these discharges requires several steps from the identification of the various pollutants to their treatment. This is why this initial work was carried out to characterize the wastewater from the Al-Hoceima slaughterhouse and to assess the performance of the treatment plant at this slaughterhouse. The results of the physicochemical analyses showed that the wastewater generated by this slaughterhouse is characterized by a neutral pH of 7.47, a high organic load of 1280 mg O2 L-1 COD, and a remarkable suspended solids content of 259 mL-1. Regarding the performance of the wastewater treatment plant connected to this slaughterhouse; The results show that this plant operates very efficiently, eliminating 65% of the COD, 70.6% of the BOD5 and 65.44% of the TSS, thus eliminating the organic matter, which is 67.82%. For the microbiological charge of these wastewater, the results showed that at the entrance the concentrations of fecal coliforms are 1×106 UFC mL-1, 15×107 UCF mL-1 fecal streptococci and 15×105 for yeast. The effluents discharged by the treatment plant comply with Moroccan standards.

The dramatic spread of COVID-19 has put the entire world at risk. In this work, the spread of COVID-19 in Iraq has been studied. Due to the increase in the number of positive cases and deaths with this disease, huge pressure acts on the economy and world professionals worldwide. Therefore, building mathematical models to predict the growth of this serious disease is extremely useful. It helps to predict the future numbers of cases in Iraq. Therefore, dynamic neural networks and curve fitting techniques have been developed to construct such a model. Data from the World Health Organization (WHO) are used as a source for mathematical model construction. The period between 25, February to 18, June 2020 was used for regression, validation, and model construction of Dynamic Neural Networks (DNN). Nine samples (19 – 27 June 2020) were used for predicting the future infected and death cases. Descriptive statistical studies showed that the standard deviation varies sharply on June as compared with earlier months of 2020. Three mathematical models are proposed. Linear, polynomials (2nd, 3rd, and 4th orders), and exponential models are used to correlate confirmed infected cases (CIC) and confirmed death cases (CDC) that represent the dependent variables as function of time (independent variable). Nonlinear regression based on least-square method is used to estimate the coefficients of models.  Exponential models were the most significant with 0.9964 and 0.9974 correlation coefficients for CIC and CDC, respectively. Validation analysis showed a significant deviation between real and predicted cases using exponential models. However, DNN models showed better response than exponential models. This is evidenced by objective and subjective comparisons. Finally, the CIC and CDC may be increased with time to approach 50000 and 2000 respectively at the end of June 2020.

The change in availability of water resources has a dynamic behavior and is influenced by many factors such as population growth and climate variability over time.  Understanding the impacts of such factors on water resources vulnerability is essential for ensuring the sustainability of future water resources. In this study, a water resources sustainable index is built using a system dynamics model to assess the effects of different scenarios at the Kowsar dam basin in southwestern Iran where managing water resources is serious challenging due to periodic drought. Based on the baseline scenario, the total population, as well as total water demand, will increase and water supply will decrease throughout the simulated period. Therefore, the imbalanced supply-demand of water can cause the water system vulnerable. In this regard, water management policies should concentrate on the demand side of water to address the problem of water resource shortage in a good manner. Although pessimistic climatic conditions along with population growth put the water system in the worse situation of water availability, where the demand control policies likely help meet the increasing water demand. Compared to the pessimistic conditions, the water sustainability index improves in normal and optimistic conditions. The highest sustainability index was obtained after controlling water demand in optimistic weather condition. Consequently, the government should provide a context in which people learn to control their daily water consumption. Also, it suggests that we can conserve water resources in the agricultural sector with conservation policies.

Although Azerbaijan is a center of natural distribution and diversity of genus Quercus around the world, less published data can be found about PCR-based genetic diversity in prevalent oak accessions. The present study aims at finding molecular variation among the Quercus species using RAPD markers. In this study, genomic fingerprinting in five Azerbaijan oak species (Quercus spp.) was carried out using 10 RAPD markers. The result showed that a total of 113 DNA fragments were amplified, of those, 91 bands were polymorphic. The highest PIC, EMR and MI values was observed in the primers OPD-05, OPB-01 and OPB-03. The genetic similarity among the genotypes examined ranged from 0.333 to 0.818 with an average of 0.498. Species-specific DNA fragments were found in all species examined. Based on the cluster analysis using UPGMA method and Jaccard’s similarity index, all the examined oak species fell into three main groups and principal coordinate analysis (PCoA) supported the clustering result. High genetic diversity was found in the tested genetic germplasm of oak species. The results of this study would be very useful for oak improvement program.

Traditionally, calculation of landscape metrics is commonly conducted on land cover/use maps of entire landscape which is created from remotely sensed data. An interesting approach, however, is to make use of sample data, without the use of wall-to-wall mapping. In the present review and case study, it is aimed to estimate three basic landscape metrics, namely Shannon’s diversity (SH), forest edge length (E) and contagion (C) from field-based sampling data. It is also intended to estimate landscape change using time series datasets. Estimated variance (sampling error) was used to assess landscape metric estimators. For this purpose, sampling data from National Inventory in the Landscape of Sweden (NILS) is used. In this case study, the metrics are estimated with acceptable precision. In most cases, the estimated variance (sampling error) was less than 10 %. The largest sampling error was 28 % for forest edge length. We will be able to compare different landscape at a given time or a landscape over time using filed-based sampling data. Furthermore, in an ecological survey it may be possible to find a relationship between landscape pattern and ecological processes such as biodiversity. The methods applied in this study is very simple and there is no need for extra measurements.

This study covered 100 displaced persons from Mosul city to which skin tests were applied as well as count of eosinophils, to detect allergy. Only 35 persons of both genders exhibited positive response to the used allergens with an increased number of eosinophils. 8 males and 27 females, and their ages ranged between 17-77 years. At testing the skin for the inhaled allergens, Saliceae trees recorded the highest overall percentage of allergy (60%), Betulaceae family recorded an overall percentage of allergy (45.7%) followed by Timothy overall percentage (42.9%), Salsola (34.3%), the combination of  three trees including Corylus, Alnus and Betula (31.4%), the plant Artemisia (25.7%), Urtica dioica (22.9%), and finally Fraxinus excelsior (22.8%).  Dogs and cats hairs recorded the highest percentage of allergy (51%) among epithelial tissue allergens, followed by horse hair (31.4%) and the least percentage was of feathers (8.6%). Houses dust mite when mixing the two types Dermatophoides farina and D. pteronyssinus recorded the highest percentage (45.7%). Among the fungi, Alternaria alternate recorded the highest percentage (37.1%), Cladosporum herbarum (34.2%) and the least percentage was related to the fungus Aspergillus fumigatu (28.6%). The studied sensitizers (except feathers) have significant difference at probability level of P < 0/05.

Globally recommended diets are a powerful method for raising the public's awareness of dietary choices. Although dietary choices drive both health and environmental outcomes, these diets make almost no reference to environmental impacts. Besides, Encephalic damage and disorders of the hepatobiliary system occur against the background of metabolic disorders. Metabolic processes largely depend on the activity and the qualitative and quantitative characteristics of sirtuin-type proteins. Protein deficiency can be filled by artificially introducing them into the body through dietary supplements. The study aimed to analyze the possibilities of using the dietary supplement OYOX to prevent environmental harm as well as treating encephalic damage and disorders of the hepatobiliary system. We used theoretical and practical research methods. In particular, the methods of analysis of literature sources, statistical data, results of clinical and preclinical studies were used. The method of generalization, analysis, systematization, classification of the obtained data was used. The results were evaluated 3 and 6 months after taking the dietary supplement. In the group of people taking OYOX, a statistically significant decrease was observed in the percentage of short telomeres (p = 0.029); a decrease in the percentage of senescent cytotoxic (CD8+ / CD28-) T cells (by 1.5%; 4.4%; 8.6% and 7.5% after 3 and 6 months respectively); improvement in lipid and carbohydrate metabolism glycosylated hemoglobin (HbA, 1%) by 4.9% (p = 0.01), total cholesterol 5.7 mmol  L-1 (p = 0.003), low density lipoprotein (LCL-C): 3.82 mmol  L-1 (p = 0.0021), homocysteine: 3.4 mmol L-1  (p = 0.001). In conclusions, dietary supplement OYOX is effectively used to eliminate the deficiency of sirtuin-type proteins SIR1, SIR3, SIR6.

The anatomical characters of the leaves, trichomes and stems of 12 species of Caryophyllaceae family were studied. The results showed that the average of epidermal cells length in the adaxial surface ranged between 95.00 µm in Agrostemma githago and 29.5 µm in Agrostemma gracile, while in the abaxial surface, it ranged between 92.5 µm in A. githago and 35.62 µm in A. gracile. Stomatal complex was circular and elliptic-shaped. All species have four types of stomata: diacytic, anomocytic, paracytic and hemiparacytic. Trichome and their distribution does play significant role in the taxonomic delimitation, A. gracile trichomes have non-glandular hairs, while Arenaria balansae has non-glandular and glandular hairs. Two types of mesophyll appear to be a good diagnostic characteristic isobilateral in the Agrostemma species and dorsiventral (bifacial) in the remaining species as well as several sclerenchyma layers including thick and thin-walled cells that surrounded vascular bundle and also the petiole contains many layers of sclerenchyma cells. Stem shape and size were different between species. The stems had the greatest size (1064.50 µm) in Acanthophyllum bracteatum, while the smallest stem cross section (450.46 µm) in A. balansae. Cells were rich in druses crystals. Sclerenchymatous layers were observed in all species. The number of sclerenchyma was different between the species, so that, 12-23 layers in A. gracile and 4-7 in A. crassifolium.  Size of pith was different. The greatest was 280.22 mm in Agrostemma githago, while no pith was found in Polycarpon tetraphyllum and Arenaria balansae.

In this research, activated carbon (coconut husk waste) is prepared using sulfuric acid activation from coconut husk waste which is a cheap material that shows agreed scavenging actions by adsorption for eliminating the toxic textile dyes (methylene blue MB, crystal violet CV, as well as Brilliant Blue BB) from the aqueous solutions. In a shaker water bath, different physio-chemical factors like contact time, adsorbent dose, pH, temperature of the dye solution and initial concentration of the dye have been measured and the adsorption time is 120 minutes. The results show that adsorption of MB, CV is favorable at a high pH value, but at acidic pH, the brilliant blue BB dye is favorable. The activated carbon thermodynamic analysis is conducted using three dyes: The Gibbs free energy, entropy and also enthalpy. According to the results, the adsorption is a Physical (endothermic). It is also found that the activated carbon is regulated by the equations of Freundlich and Temkin. Finally, field emission scanning electron microscopy (FE-SEM) and Fourier-transform infrared spectroscopy (FT-IR) have been used to show adsorption.

Urbanization of catchment regions is a major cause of freshwater ecosystem degradation worldwide. As catchments become more developed and river ecosystems become increasingly engulfed in various land use activities, there is a growing need to understand these impacts on freshwater ecosystems. Macroinvertebrate are extensively used as indicators of ecosystem health and have been an instrument tool in ecosystem monitoring and management. Five stations with different types of land use (reference station, forest, recreational, agricultural, urban area) of Chehel Chai River, Iran were sampled in 2018. A total of 2040 macroinvertebrate belonging to 6 orders from 12 families were identified. The highest abundance was related to the diversity of the Ephemeroptera (Batidae). According to the results, the abundance of macroinvertebrate was significantly different in the seasons and sampling stations. The maximum value of diversity indices was measured to the Shannon index (S1= 1.06, autumn), Simpson's Index (S1= 0.63, autumn), Margalef richness (S1= 0.9, spring) and Pielou's index (S3= 0.92, summer). Stations in up-stream (forest area) recorded highest species richness, abundance and proportion of sensitive macroinvertebrates compared to the agricultural and urban development area. Cluster and nMDS analysis revealed that among the macroinvertebrates, Ephemeroptera were distinct in the forest sites and Diptera and Oligochaeta in urban area of Chehel Chai River. This finding suggests that present environment problem (such as: agriculture, tourism and urban area) caused serious impacts on the biodiversity of Chehel Chai River.

In the current study, the concentrations of total petroleum hydrocarbons (TPHs) in water and total organic carbon content in sediments were measured. A number of environmental factors, including water temperature, dissolved oxygen, pH, electrical conductivity, nitrates, and phosphates, have also been measured in the Tigris River deposits and in three selected stations on its course in Maysan Province in southern Iraq during the months of November, 2014, December, 2014, and January, 2015. The highest temperature, 25 °C, was recorded at Ali Al Gharbi District Station (St1) in November, while the lowest temperature, 15°C, was recorded at Al-Amara District Station (St2) in January. Moreover, the highest value of dissolved oxygen, 9.1 mg L-1, was recorded in St1 in January, while the lowest value, 7.5 mg L-1, was recorded at the same station in December. All pH values were within the baseline trend for the duration of the study, with the highest level, 7.8, recorded at St2 in November, while the lowest level, 7.05, at Al Majar Al-Kabir District Station (St3) in the same month. The highest value for electrical conductivity was 2416 μs cm-1 at Al-Amara District Station in November, while the lowest value was 2000 μs cm-1 at the same station in December. The highest concentration of nitrate ion, 6.25 mg L-1, was recorded at St2 in November, while the lowest value, 3.8 mg L-1,at St1 in December. Moreover, the highest phosphate value, 0.59 mg L-1, was recorded at St2 in January, while the lowest, 0.049 mg L-1, at St3 in November. The highest rate of total organic carbon content was 2.15%, recorded at St2 in November, while the lowest, 1.7%, at St1 in the same month. The highest concentration of TPHs in the water was 5.22, recorded at St2 in January, while the lowest, 2.85, at St1 in November. The present study concluded that St2 was heavily contaminated with organic matter. This station had the highest concentration of total petroleum hydrocarbons, which is mainly due to the increased population density beside the station, leading to increased human activities and the introduction of various wastes. These wastes contain nutrients and organic compounds, such as compounds containing petroleum derivatives, discharging to the water and sediment. Furthermore, there was a positive correlation between the organic carbon rate (%) and the concentration of petroleum hydrocarbons.

Drought is a climatological phenomenon that occurs across all climate zones of the world. It causes environmental and economic loss and can negatively affect agricultural profit, especially in dry and semi-arid areas. This study used the Standardized Precipitation Index (SPI) and Normalized Difference Vegetation Index (NDVI) to model drought impacts on agricultural production. The role of meteorological and hydrological parameters was considered simultaneously. The results revealed that: (1) the increase of drought intensity leads to the reduction of crop production, while in the case of high-level drought, the production stays consistent; (2) NDVI could model the impacts of drought on crops production (R2 = 0.60 and RMSE = 0.42); (3) NDVI had a better ability for showing SPI fluctuations, but in higher drought intensities, it was less sensitive to SPI fluctuations; (4) the spatial pattern of drought in the study area showed that the northern parts of the Basrah Governorate have the highest sensitivity to drought; (5) the temporal pattern of long-term SPI showed a high level of risk for agricultural activities due to drought; and (6) air temperature and humidity are the main meteorological parameters of crops production affecting the interpretation of the impacts of drought on agriculture production in Basrah, Iraq

In this study, the arsenic polution of drinking water wells of rural areas was investigated for obtaining the extent of this pollution and also finding the possible sources for this pollution. So, the distribution of arsenic in 19 wells with different depth from 5 to 100 m and water flows were examined in a 6-month period from September 2016 to February 2017. These samples were compared with the international standards. Effects of well depth, water flow, rainfall, soil and land usage on the arsenic concentration were evaluated. The results show that places with the inceptisols have higher water pollution. The highest and lowest arsenic concentrations are reported in Daryache and Hokerd villages with 153 and 0.5 μg L-1, respectively. In addition, matching the geographical map of water pollution with the land use map by hot spots analysis indicated that more polluted water wells have been located around the agricultural land. The results also indicated that the accuracy of the RBF method for obtaining the zoning arsenic concentration is higher than the other methods. The results of Pearson’s correlation test indicated that there is no significant relationship among the depths, flows and rainfalls of wells and the arsenic concentration.

Fresh and processed vegetables are included in our diet every day. Due to vegetables the human body receives the bulk of the vitamins and minerals necessary for life. Considering the special role of the vegetable growing industry in population provision with the necessary fortified products, topical issues of the industry efficiency and investment attractiveness increase are of strategic importance for the country food security and for import substitution problem solution for fresh vegetable products. The development of domestic vegetable growing is under close scrutiny of state authorities at both the federal and regional levels. Significant development funds are allocated annually by the budgets of various levels. The current support measures include compensation for the part of the interest rate on loans (soft loans), reimbursement of capital construction costs, agricultural-technological work, soil fertility increase, etc. Thanks to these support measures, vegetable growing in Russia has become highly effective and it contributes to import substitution. At the same time, the allocated funds and agricultural production must be financially protected from uncontrolled natural anomalies. Agricultural insurance is a reliable way to protect the property interests of an agricultural producer from the impact of natural disasters. The study examined the Russian and foreign experience of agricultural insurance. Much attention is paid to the application of the statistical research method. Taking into account the problematics of the research topic and its poor study, this work makes a great contribution to the scientific literature. The need for agricultural insurance is referred to the main result of the study, and is recommended in planning the activities of agricultural production

This research aimed to determine the level of knowledge of poultry field workers in Al-Kufa City, Najaf Province with preventive practices against bird flu diseaseand its relationship to some of their personal and objective factors. A questionnaire form was adopted to collect data including two parts. The first one was related to personal and objective information of workers in poultry fields. The second one was included a cognitive level test for them, including 40 test items distributed into four areas of knowledge about bird flu as follows: bird flu disease, transmission ways of disease to human, preventive practices against the disease and types of disinfectants used in poultry fields. The study was included 722 workers in all poultry fields of Al-Kufa City and a random sample of them (15%) was applied. Results showed that the level of knowledge of poultry field workers was weak to medium and varied among knowledge areas of bird flu disease. There was a positive correlation between the cognitive level and each of academic achievement and the type of breeding, while, there was negative correlation with age and field specialization variables. Other factors such as years of work, workers number, the level of contact with preventive and indicative information sources, the distance between the field and the house and the type of birds had no significant correlation. The study was recommended the necessity of establishing indicative programs for workers in poultry fields about preventive practices and disinfectant types used against bird flu disease.

The article deals with the ecological and hydrogeological conditions of the hydrogeological structures in the Barents-Kara shelf. Based on the hydrogeological and geoecological state of the Barents-Kara shelf, geoecological hazards were considered and distributed within the oil and gas regions of the West Siberian and East Barents oil and gas provinces. Preliminary geoecological zoning was performed and eco-geological zones were identified on the territory of first-order hydrogeological structures corresponding to the borders of several oil and gas-bearing regions of the East Barents and West Siberian oil and gas-bearing provinces. Thus, the current geoecological state of the Barents-Kara shelf was assessed. When drawing up the map of geoecological hazards, the hazards of technogenic origin caused by human economic activity and natural origin were taken into account, in particular, the influence of the neotectonic mode on the territory of the Barents-Kara shelf.