Abstract:A total of 413 diatom taxa were known for aquatic habitats of the Lena Delta Nature Reserve. We identified 385 taxa in 14 small tundra lakes near the reserve that significantly enriched the diatom diversity of the region (666 taxa including definitions to the genus level). Thus, the species composition of diatoms in the reserve and adjacent territories was increased by 278 species. We showed that the species of the genera Pinnularia (57) and Eunotia (51) have predominance at the family and generic levels. The … Show more
“…The noticeable presence of species of the genus Pinnularia in the studied flora of the lakes of the park attracted attention, since these species are inherent in the floras of high-mountain and high-latitude reservoirs with fresh, slightly acidic waters and low electrical conductivity [46,49,50], which is confirmed by our chemical analyses (Table 2), that is, they allow us to classify the studied lakes as high mountain habitats not subject to anthropogenic influence. Thus, the ecological conditions of the waters form a suitable environment for the development of representatives of Pinnularia species.…”
Section: Discussionsupporting
confidence: 68%
“…At the same time, the number of indicators of slightly alkaline waters decreased slightly with altitude. The low degree of the studied lakes' diatom endemism and rarity [15,23,49] was revealed for this first study, which proved to be an insufficient study in the park, on the one hand, and stimulates future research on the other.…”
Section: Discussionmentioning
confidence: 82%
“…Thus, the ecological conditions of the waters form a suitable environment for the development of representatives of Pinnularia species. In addition, species of the genus Pinnularia are also known to inhabit extreme habitats, including highlands and arctic [49], indicators of diversity hotspots in the Ecotones, which are a border area of different landscapes [51]. Pinnularia interrupta and P. maior, which were found in 14 of the investigated lakes and pond, were recorded very frequently (VF) (86.66%) and were among the important species in the diatom flora of the park (Appendix A Table A1).…”
The altitude of the habitat is one of the important regulators of species survival. Kaçkar Mountains National Park is located in the Eastern Black Sea region of Turkey. This is the first study on the benthic diatom flora of the high mountain lakes in Kaçkar Mountains National Park, which is situated between 2782 and 3075 m a.s.l. A total of 84 diatom species were identified from benthic communities of 15 habitats in summer (19 July, 28 August) and autumn (10 September) months of 2020. The genus Pinnularia (thirteen species) formed the basis of the taxonomic list, followed by Eunotia (five species), Navicula (five species), and Frustulia (four species) genera, respectively. The waters in all the studied lakes were fresh, low-saline, with low-alkaline or circumneutral pH and organically uncontaminated, as evidenced by prevailed bioindicator groups. Statistical methods and comparative floristic results confirm the role of the lake altitude for the diatom species distribution. The species richness of the studied lakes was higher in lakes with lower altitudes. The statistical approach also revealed the potential for an increase in the number of species in high mountain lakes if the study of the diatom flora of the Kachkar Mountains National Park is continued and the species composition of the lakes is replenished. Further studies will be needed to continue exploring this pattern. To protect studied high mountain lakes, their ecological conditions must be constantly monitored in the Kaçkar Mountains National Park.
“…The noticeable presence of species of the genus Pinnularia in the studied flora of the lakes of the park attracted attention, since these species are inherent in the floras of high-mountain and high-latitude reservoirs with fresh, slightly acidic waters and low electrical conductivity [46,49,50], which is confirmed by our chemical analyses (Table 2), that is, they allow us to classify the studied lakes as high mountain habitats not subject to anthropogenic influence. Thus, the ecological conditions of the waters form a suitable environment for the development of representatives of Pinnularia species.…”
Section: Discussionsupporting
confidence: 68%
“…At the same time, the number of indicators of slightly alkaline waters decreased slightly with altitude. The low degree of the studied lakes' diatom endemism and rarity [15,23,49] was revealed for this first study, which proved to be an insufficient study in the park, on the one hand, and stimulates future research on the other.…”
Section: Discussionmentioning
confidence: 82%
“…Thus, the ecological conditions of the waters form a suitable environment for the development of representatives of Pinnularia species. In addition, species of the genus Pinnularia are also known to inhabit extreme habitats, including highlands and arctic [49], indicators of diversity hotspots in the Ecotones, which are a border area of different landscapes [51]. Pinnularia interrupta and P. maior, which were found in 14 of the investigated lakes and pond, were recorded very frequently (VF) (86.66%) and were among the important species in the diatom flora of the park (Appendix A Table A1).…”
The altitude of the habitat is one of the important regulators of species survival. Kaçkar Mountains National Park is located in the Eastern Black Sea region of Turkey. This is the first study on the benthic diatom flora of the high mountain lakes in Kaçkar Mountains National Park, which is situated between 2782 and 3075 m a.s.l. A total of 84 diatom species were identified from benthic communities of 15 habitats in summer (19 July, 28 August) and autumn (10 September) months of 2020. The genus Pinnularia (thirteen species) formed the basis of the taxonomic list, followed by Eunotia (five species), Navicula (five species), and Frustulia (four species) genera, respectively. The waters in all the studied lakes were fresh, low-saline, with low-alkaline or circumneutral pH and organically uncontaminated, as evidenced by prevailed bioindicator groups. Statistical methods and comparative floristic results confirm the role of the lake altitude for the diatom species distribution. The species richness of the studied lakes was higher in lakes with lower altitudes. The statistical approach also revealed the potential for an increase in the number of species in high mountain lakes if the study of the diatom flora of the Kachkar Mountains National Park is continued and the species composition of the lakes is replenished. Further studies will be needed to continue exploring this pattern. To protect studied high mountain lakes, their ecological conditions must be constantly monitored in the Kaçkar Mountains National Park.
“…Data on the taxa composition of the Bacillariophyceae, Mediophyceae, and, partly, Chrysophyceae of the studied water bodies were partly published by us earlier [6,8] and their list was borrowed from our works. Handbooks and articles were used for the diatom taxa identification .…”
Section: Sampling and Laboratory Studymentioning
confidence: 99%
“…Attention to studying the diversity and conditions influencing the formation of Arctic aquatic communities has a significant history [7,8]. There are still no works devoted to bioindication, the search for the most important environmental factors that determine the biodiversity of aquatic organisms in the conditions of the High Arctic island.…”
The significant interest in the islands in the Russian Arctic has been in terms of available oil reserves, which determine the direction of economic development and associated environmental risks for this sector of the Arctic in the near future. Kotelny Island is the largest island of the New Siberian Islands Archipelago included in the protected zone of the Lena Delta Nature Reserve, which is located at 76° N, washed from the west by the Laptev Sea, washed from the east by the East Siberian Sea in a permafrost zone, and characterized by harsh climatic conditions defined by the northeast winds that prevail in vegetative season. January sees temperatures ranging from −32 to −35 °C, and July from +6 to +8 °C, which causes a short growing season. Samples were taken between August 3 and 8, 2018 in 12 freshwater bodies where 210 taxa were revealed. Aquatic communities were dominated by zygnematophycean and diatom algae, grouped in the basins of two rivers and associated with the position on the island’s landscape, which suggests the influence of cold north-east winds, leading to the avoidance of habitats in open and high places, which was revealed by statistical methods and also confirms the high individuality of taxa composition. Bioindication methods showed that water bodies are slightly alkaline, with low ion concentrations, with the presence of sulfides in low-lying habitats, and average saturation with organic matter. The mesotrophic status of the studied water bodies was evaluated through an assessment and the type of nutrition in the communities of algae and cyanobacteria indicates they formed there as true autotrophs, which corresponds to the status of a protected area and can serve as a reference level for monitoring anthropogenic impact.
The species composition, the structure of phytoplankton communities, hydrochemical parameters in the artificial cooling reservoir of one of the largest thermal power plants (TPP) in the north-east of Europe in the Pechora River basin, Komi Republic were studied in the ice-open period in June and August. Altogether 81 species of algae and cyanobacteria was revealed with the last one predominated. Among cyanobacteria and algae (Bacillariophyta, Chlorophyta), indicators of water quality were found. Assessment of water quality according to the species composition and abundance of indicator phytoplankton species showed that the waters of the Pechorskoe Reservoir can be at-tributed to the III class of water quality, beta-mesosaprobic self-purification zone, with water quality of satisfactory purity, retaining the ability to self-purify. An increase in the diversity of plankton communities and high values of their abundance and biomass under the influence of the warming effect of TPP water outlet were noted and revealed its spatial distribution over the reservoir surface. The plankton of the northern reservoir under the influence of warm waters indicates a slight in-crease in the trophic status of the studied water body, which is also confirmed by the data of hydrochemical analysis. Ecological mapping for the chemical and biological variables as well as pollution indices over the water area of the reservoir was carried out. The results obtained can be used to make forecasts of changes in the phototrophic biota of small northern water bodies under the conditions of climate change.
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