Diatoms of modern bottom sediments in Siberian arctic

Palagushkina, Olga; Nazarova, Larisa; Wetterich, Sebastian; Schirrmeister, Lutz

doi:10.1134/s1995425512040105

Cited by 37 publications

(23 citation statements)

References 7 publications

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“…Detrended correspondence analysis (DCA) with detrending by segments was performed on the macrozoobenthos data (rare taxa downweighted) to explore the main pattern of taxonomic variation among sites and to determine the lengths of the sampled environmental gradients, from which we decided whether unimodal or linear statistical techniques would be the most appropriate for the data analysis (Birks 1995;Palagushkina et al 2012Palagushkina et al , 2017Frolova et al 2013). The gradient length of species scores was relatively long.…”

Section: Methodsmentioning

confidence: 99%

Macrozoobenthic communities of the saline Bolshaya Samoroda River (Lower Volga region, Russia): species composition, density, biomass and production

2019

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We investigated species composition, density, biomass and estimated production of macrozoobenthos communities in the middle and mouth reaches of the saline Bolshaya Samoroda River (Volgograd region, Russia) from May 2013 to April 2014. A total of 30 euryhaline and halophilic taxa were found during the study period. There were significant differences in the species composition between both study sites that could be explained by differences in ecological conditions. The production of macrozoobenthos in the middle reach was 22.54 g dry wt m -2 yr -1 , and in the mouth reach the production was 117 g dry wt m -2 yr -1 . In all seasons of the year at both sites, the greatest contribution to benthic production was made by the same taxonomic groups. Diptera dominated at both sites. Amphipods were abundant only in the middle reach. In the middle reach, the greatest contributions to production were made by Gammarus lacustris, Sphaeromias pictus and Glyptotendipes salinus, and in the mouth reach, Microchironomus deribae, Tanytarsus kharaensis and Chironomus salinarius contributed to benthic production the most.

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Section: Methodsmentioning

confidence: 99%

Macrozoobenthic communities of the saline Bolshaya Samoroda River (Lower Volga region, Russia): species composition, density, biomass and production

2019

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“…Furthermore, IWP ponds and thermokarst lakes are abundant aquatic ecosystem types in the Arctic (Grosse et al, 2013). They are hotspots of biological activity and diversity (Smol and Douglas, 2007), providing diverse habitats for microorganisms, plants, birds, and aquatic communities (Palagushkina et al, 2012;Bobrov et al, 2013;De Klerk et al, 2014). Continuous organic matter accumulation and preservation during syngenetic permafrost aggradation make northern IWPs a valuable climate and environmental archive.…”

Section: Ice-wedge-polygon (Iwp) Developmentmentioning

confidence: 99%

Holocene ice-wedge polygon development in northern Yukon permafrost peatlands (Canada)

Fritz

Wolter

Rudaya

et al. 2016

Quaternary Science Reviews

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a b s t r a c tIce-wedge polygon (IWP) peatlands in the Arctic and Subarctic are extremely vulnerable to climatic and environmental change. We present the results of a multidisciplinary paleoenvironmental study on IWPs in the northern Yukon, Canada. High-resolution laboratory analyses were carried out on a permafrost core and the overlying seasonally thawed (active) layer, from an IWP located in a drained lake basin on Herschel Island. In relation to 14 Accelerator Mass Spectrometry (AMS) radiocarbon dates spanning the last 5000 years, we report sedimentary data including grain size distribution and biogeochemical parameters (organic carbon, nitrogen, C/N ratio, d 13 C), stable water isotopes (d 18 O, dD), as well as fossil pollen, plant macrofossil and diatom assemblages. Three sediment units (SUs) correspond to the main stages of deposition (1) in a thermokarst lake (SU1: 4950 to 3950 cal yrs BP), (2) during transition from lacustrine to palustrine conditions after lake drainage (SU2: 3950 to 3120 cal yrs BP), and (3) in palustrine conditions of the IWP field that developed after drainage (SU3: 3120 cal yrs BP to 2012 CE). The lacustrine phase (pre 3950 cal yrs BP) is characterized by planktonic-benthic and pioneer diatom species indicating circumneutral waters, and very few plant macrofossils. The pollen record has captured a regional signal of relatively stable vegetation composition and climate for the lacustrine stage of the record until 3950 cal yrs BP. Palustrine conditions with benthic and acidophilic diatom species characterize the peaty shallow-water environments of the low-centered IWP. The transition from lacustrine to palustrine conditions was accompanied by acidification and rapid revegetation of the lake bottom within about 100 years. Since the palustrine phase we consider the pollen record as a local vegetation proxy dominated by the plant communities growing in the IWP. Ice-wedge cracking in water-saturated sediments started immediately after lake drainage at about 3950 cal yrs BP and led to the formation of an IWP mire. Permafrost aggradation through downward closed-system freezing of the lake talik is indicated by the stable water isotope record. The originally submerged IWP center underwent gradual drying during the past 2000 years. This study highlights the sensitivity of permafrost landscapes to climate and environmental change throughout the Holocene.

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“…At the present state of knowledge, biological indicators from aquatic (chironomids, diatoms, ostracods, cladocera) and terrestrial environments (pollen, plant macrofossils) are the most reliable proxies, because they react sensitively to climate change and define different aspects of environments, which should be assessed together for reliable reconstructions (Smol et al, 2005;Solovieva et al, 2005Solovieva et al, , 2008Kienast et al, 2011;Self et al, 2011;Palagushkina et al, 2012;Pestryakova et al, 2012). The basis, however, of all quantitative reconstruction approaches are regional calibration datasets from which the empirical reconstruction models (i.e.…”

Section: Introductionmentioning

confidence: 99%

Holocene climate conditions in central Yakutia (Eastern Siberia) inferred from sediment composition and fossil chironomids of Lake Temje

Nazarova

Lüpfert

Subetto

et al. 2013

Quaternary International

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a b s t r a c tA 380 cm long sediment core from Lake Temje (central Yakutia, Eastern Siberia) was studied to infer Holocene palaeoenvironmental change in the extreme periglacial setting of eastern Siberia during the last 10,000 years. Data on sediment composition were used to characterize changes in the depositional environment during the ontogenetic development of the Lake Temje. The analysis of fossil chironomid remains and statistical treatment of chironomid data by the application of a newly developed regional Russian transfer functions provided inferences of mean July air temperatures (T July ) and water depths (WD). Reconstructed WDs show minor changes throughout the core and range between 80 and 120 cm. All the fluctuations in reconstructed water depth lie within the mean error of prediction of the inference model (RMSEP ¼ 0.35) so it is not possible to draw conclusions from the reconstructions. A qualitative and quantitative reconstruction of Holocene climate in central Yakutia recognized three stages of palaeoenvironmental changes. The early Holocene between 10 and 8 ka BP was characterized by colderthan-today and moist summer conditions. Cryotextures in the lake sediments document full freezing of the lake water during the winter time. A general warming trend started around 8.0 ka BP in concert with enhanced biological productivity. Reconstructed mean T July were equal or up to 1.5 C higher than today between 6.0 ka and 5.0 ka BP. During the entire late Holocene after 4.8 ka BP, reconstructed mean T July remained below modern value. Limnological conditions did not change significantly. The inference of a mid-Holocene climate optimum supports scenarios of Holocene climatic changes in the subpolar part of eastern Siberia and indicates climate teleconnections to the North Atlantic realm.

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Diatoms of modern bottom sediments in Siberian arctic

Cited by 37 publications

References 7 publications

Macrozoobenthic communities of the saline Bolshaya Samoroda River (Lower Volga region, Russia): species composition, density, biomass and production

Macrozoobenthic communities of the saline Bolshaya Samoroda River (Lower Volga region, Russia): species composition, density, biomass and production

Holocene ice-wedge polygon development in northern Yukon permafrost peatlands (Canada)

Holocene climate conditions in central Yakutia (Eastern Siberia) inferred from sediment composition and fossil chironomids of Lake Temje

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