Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas

Knights, Deon; Piliouras, Anastasia; Schwenk, Jon; Hariharan, Jayaram; Russoniello, Christopher J.

doi:10.1029/2022gl102201

Cited by 4 publications

(2 citation statements)

References 70 publications

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“…The Arctic deltas are responsible for nutrient transport to the sea, which varies by delta and season, and it is estimated that the Lena Delta retains about 15% of the input load, the largest in the Arctic Ocean [69]. At the same time, the deposition of nitrates by the tundra landscape in the spring and their subsequent accumulation in lakes and wetlands adjacent to river channels contributes to the enrichment of lake water with a nutrient base [69]. This makes the water of the Lena River a source of nutrients [17,70] on the one hand, but on the other hand, stimulates the diversity of algae, as has been shown in the lakes of the Tiksi coastal region [18].…”

Section: Discussionmentioning

confidence: 99%

Diversity of Diatom Algae in the Lena Delta Nature Reserve and the Adjacent Territory in the Specific Ecological Factors of the Arctic

2023

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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 index of intraspecific variability Ssp./Sp. for the lakes of the reserve was 1.11, and that for the lakes of the Tiksi region 1.14, which is typical for high-latitude and high-mountain communities. The number of rare or endangered species varied in different lakes from 1 to 10, totaling 42 species for the entire study area. Bioindication has shown that potentially threatened species prefer moderate temperatures, and slightly acidic or neutral environments free from organic pollution. A comparative analysis of the species composition of diatoms in the vicinity of the Lena Delta and other northern water bodies of Yakutia and the Arctic Islands showed that the species composition of each lake in the Arctic has a discernably different species distribution. The indicator characteristics show a certain response of the species composition of diatoms to changes in salinity, pH, and organic pollution. Regularities in the spatial distribution of diatoms in the study area were revealed in connection with the environmental variables of their habitat. Statistical mapping of diatom diversity data and bioindicators revealed a pronounced response to point pollution, and also let us assume the influence of summer northeast winds on species composition of the studied lake communities. We suggest that the high diversity inherent in the diatom lakes of the Tiksi coastal zone, which can even be updated in further studies, can be considered as a property of coastal biota inherent in ecotones. Since it is in the coastal Tiksi region that a surge in the number of species is observed, this region can be considered not only an ecotone, but also a hotspot of diatom diversity. The results of the study are important for developing the basis for monitoring biodiversity under the conditions of anthropogenic and climatic changes in the Arctic.

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Section: Discussionmentioning

confidence: 99%

Diversity of Diatom Algae in the Lena Delta Nature Reserve and the Adjacent Territory in the Specific Ecological Factors of the Arctic

2023

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“…The study of the diversity of organisms in the Arctic is of high priority, as it can indicate the impact of changing climatic conditions [1]. It is important to assess the impact not only of climate warming, which is currently receiving considerable attention [2] but also the impact of low-temperature conditions on the diversity and functioning of aquatic ecosystems [3].…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton in the Ecological Assessment of the Mining Facilities Influence on the Anabar River in the Permafrost Zone of the Arctic, Eastern Siberia, Russia

Barinova,

Gabyshev,

Gabysheva

2023

Land

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In modern conditions of climate change and increased anthropogenic pressure on aquatic ecosystems, the study of the diversity of organisms in the Arctic has become a top priority. Our study continues a series of studies on the biodiversity of Arctic rivers. Using innovative methods, such as ecological mapping, statistics, and bioindication, we identify environmental factors that influence phytoplankton diversity in the river basin under study. For the Anabar Arctic River, an increase in the diversity of phytoplankton was found to the north towards the mouth of the river, which is associated with an increase in turbidity from industrial discharges. A weak effect of organic pollution and toxic effects associated with existing settlements have been identified, but it has been established that natural processes of self-purification take place in the studied Arctic River. Among 210 species of phytoplankton, an increase in the diversity of chrysophytes in the northern direction was revealed, consistent with the intensification of severe Arctic climatic conditions. Since the study region is characterized by increased diamond mining, we recommend continuing to monitor phytoplankton, track changes in the Anabar River ecosystem, and expand such observations to other Arctic rivers.

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Diversity of Diatom Algae in the Lena Delta Nature Reserve and the Adjacent Territory in the Specific Ecological Factors of the Arctic

Barınova¹,

Габышев²,

Генкал³

2023

Preprint

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For the water bodies of the Lena Delta Nature Reserve, 413 taxa were known. In 14 small tundra reservoirs in its vicinity, we identified 385 taxa, which in the compilatory list made up a significant diversity (666 taxa including definitions to the genus level) of diatoms. Thus, the species composition of diatoms in the reserve and adjacent territories was replenished by 278 species. The predominance of species of the genera Pinnularia (57) and Eunotia (51) at the family and generic levels was revealed. Index of intraspecific variability Ssp./Sp. for the lakes of the reserve was 1.11, and for the lakes of the Tiksi region 1.14, which is typical for high-latitude and high-mountain communities. The number of rare or endangered species varied in different lakes within 1-10, totaling 42 species for the entire study area. Bioindication has shown that potentially threatened species prefer moderate temperatures, slightly acidic or neutral environments free from organic pollution. A comparative analysis of the species composition of diatoms in the vicinity of the Lena Delta and other northern water bodies of Yakutia and the Arctic Islands showed that the species composition of each lake in the Arctic is strictly individual. The indicator characteristics show a certain response of the species composition of diatoms to changes in salinity, pH, and organic pollution. A number of regularities in the spatial distribution of diatoms in the study area were found in connection with the physicochemical parameters of their habitat, height above sea level, and relation to a particular catchment basin. Statistical mapping of indicators of community and habitat diversity revealed a strong reaction to point one-time pollution and made it possible to assume the influence of summer northeast winds on the species composition. We suggest that the high diversity inherent in the diatom lakes of the Tiksi coastal zone, which can even be replenished in further studies, can be considered as a property of coastal biota inherent in ecotones. Since it is in the coastal Tiksi region that a surge in the number of species is observed, this region can be considered not only an ecotone, but also a hotspot of diatom diversity. The results of the study are important for developing the basis for monitoring biodiversity under the conditions of anthropogenic and climatic changes in the Arctic.

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Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas

Cited by 4 publications

References 70 publications

Diversity of Diatom Algae in the Lena Delta Nature Reserve and the Adjacent Territory in the Specific Ecological Factors of the Arctic

Diversity of Diatom Algae in the Lena Delta Nature Reserve and the Adjacent Territory in the Specific Ecological Factors of the Arctic

Phytoplankton in the Ecological Assessment of the Mining Facilities Influence on the Anabar River in the Permafrost Zone of the Arctic, Eastern Siberia, Russia

Diversity of Diatom Algae in the Lena Delta Nature Reserve and the Adjacent Territory in the Specific Ecological Factors of the Arctic

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