Sergei Korsun

Sergei Korsun
P.P. Shirshov Institute of Oceanology · Paleoecology and Biostratigraphy

PhD

About

66
Publications
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Publications

Publications (66)
Article
Full-text available
Intertidal foraminifera tend to decline in abundance and species richness toward the poles. Neither their mere existence at high latitudes has been documented nor has their species composition been characterized. To fill this gap, we conducted reconnaissance in the sheltered fjordhead of the Dicksonfjord (78°N). A transect of seven mudflat stations...
Article
Full-text available
Species of large, testate, rhizarian protists in the genus Gromia are often common in high-latitude coastal environments, including fjords, but are frequently overlooked and almost all are undescribed. Here, we describe three new gromiid species from the Nuuk fjord system on the west coast of southern Greenland. Morphologically, the new species dif...
Article
Full-text available
This study was carried out in the Yenisei estuary and in the adjacent part of the Kara Sea shelf. We analyzed and compared the distribution patterns of the different benthic taxa and size classes (micro-, meio-, macro- and megabenthos) along a pronounced gradient of environmental factors. Four ecological zones were distinguished based on certain en...
Article
Abundance and diversity of intertidal benthic foraminifera decreases towards the poles. Well studied in the temperate zone, saltmarsh foraminiferal assemblages have only recently received attention at higher latitudes. We report modern foraminifera, including the taxonomy, abundance, and zonation, from a pristine saltmarsh in the subarctic White Se...
Article
Kongsfjorden, a fjord in north-western Svalbard, is characterized by large environmental gradients driven by meltwater processes along the margins of tidewater glaciers and the inflow of relatively warm Atlantic Water, the main heat source for the European Arctic. These factors make Kongsfjorden a key area to investigate changes in the polar climat...
Article
Full-text available
The article presents a microphotograph dataset of 106 taxa of benthic foraminifera (BF) from surface sediments collected at 26 grab station during RV Akademik Ioffe 51st cruise (summer 2016). The selected stations are located along a 59.5°N transect in the North Atlantic. This is the key area of climate control, where the interaction of warm surfac...
Poster
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The subarctic region (50-70°N) is characterized by the largest annual temperature range with harsh winters and mild summers. Low temperatures in winter result in ice cover of water bodies. Subarctic salt marshes, a type of coastal wetlands in the upper intertidal zone vegetated with halophytes, are covered with fast ice several months a year. Salt...
Poster
Full-text available
Both the standing stock and taxonomic diversity of marginal marine foraminifera tend to decrease polewards (Lübbers, Schönfeld, 2018). Data on living assemblages of intertidal and salt marsh foraminifera from the subarctic are scarce and are almost absent from higher latitudes. Thus, the distribution limits of the littoral foraminifera to the north...
Article
Full-text available
Current 'Atlantification' of the Arctic Ocean affects benthic communities leading to the changes in their structure and abundance. Such areas as Svalbard that are seasonally affected by Atlantic and Arctic water masses may give a possibility to preliminary estimate the response of benthic communities to short-term environmental changes and to evalu...
Article
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The invertebrate fauna of the Laptev Sea is one of the least investigated in the Arctic. In particular, little is known about the Harpacticoida (Copepoda, Crustacea)—one of the main components of marine meiofauna. Major objectives of our study were (1) to describe harpacticoid composition obtained from three sublittoral stations, (2) to compile the...
Article
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Glaciers in the fjords of Svalbard have been receding over last decades. Tempelfjorden, a typical glaciated fjord in West Spitsbergen (78°24′06″ N, 17°02′30″ E), has been sampled in summer 1995 and 2001–2007 for modern benthic foraminifera. We have normalized the abundances and unified the taxonomy of all these published and unpublished data sets a...
Presentation
Full-text available
The SSF funded project “Sediment flux from source to sink – the Coastal Link” is an international, multi-disciplinary research project aiming at understanding and quantifying sediment distribution patterns in Svalbard fjords. The current project (2016-2017) focuses on Kongsfjorden and Dicksonfjorden as representatives for glacially and non-glaciall...
Poster
Full-text available
The cosmopolitan salt-marsh foraminifer Trochammina inflata (Montagu) is extensively used in both paleoenvironmental reconstructions and ecological surveys of salt-marsh foraminifera, which requires correct identification. Images of the T. inflata published over years depict differences in test shape, umbilicus features, incurvation of sutures, and...
Conference Paper
Full-text available
Valleys and fjords are the key transport and storage systems for sediments and biogeochemical elements from high arctic landscapes to the ocean. Sediment and nutrient fluxes are important for the biochemical cycle in the fjords and eventually in the ocean, and are important input data to earth system models. At present, high latitude systems are un...
Poster
Full-text available
Coastal salt marshes are vegetated areas in the upper intertidal of sheltered shores. The salt marsh foraminiferal assemblages of southernmost Chilean marshes have never been a subject of a separate study. We documented benthic foraminifera from the southernmost salt marsh studied to date. Surface-sediment samples were collected along 7 short inter...
Article
Full-text available
A small planispiral rotaliid, Nonion? niveum, was described by Lafrenz from the Eemian (upper Pleistocene) of the Baltic Sea. Since then, the species has several times been attributed to other genera (Haynesina, Protelphidium), resulting in taxonomic confusion. Recently, a morphologically identical foraminifer has been found in the White Sea, which...
Article
Full-text available
The heights of the main epiglacial terraces in the eastern part of the Kildin Island were precised. 14C dating of clamshells from deposits of the terraces at the heights 8-14 m and lower showed that these terraces were formed by abrasion of the older (Atlantic stage of the Holocene) terrace deposits. The basin of the lake Mogil'noye is supposed to...
Article
Full-text available
A large monothalamous foraminiferan, Toxisarcon taimyr sp. nov., has been isolated from the benthic samples from the Kara Sea inner shelf near the mouth of Yenisey river estuary, at a depth of 50–100 m. In its overall morphology, the new species closely resembles T. synsuicidica, one of the two species of Toxisarcon described to date. It possesses...
Article
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Lake Mogilnoe (Kildin Island, the Barents Sea) is a marine stratified lake, a refuge for landlocked populations of marine organisms. Unlike other known marine lakes from polar areas, which communicate with the sea by water percolation at the surface, Mogilnoe has a subterranean connection with the sea like tropical and subtropical anchialine lakes....
Article
Full-text available
The bright colouration of the cytoplasm in intertidal rotaliid foraminifera and their particle-gathering activity reliably reveals live specimens in fresh samples, without any fixatives or dyes applied. Using this approach, we demonstrate that live representatives of three rotaliid species, all belonging to the genus Elphidium, were common on inter...
Article
Full-text available
The aim of the present study was to compare preservation, staining and preparation techniques to assess the influence of different sample treatments and analyses on the accuracy of benthic foraminiferal assemblage data from NE Atlantic shelf seas. Replicate surface samples from the SE North Sea were preserved with ethanol-rose Bengal or formalin, s...
Article
Full-text available
The European Community Marine Strategy Framework Directive (MSFD) was established to provide guidelines for monitoring the quality of marine ecosystems. Monitoring the status of marine environments is traditionally based on macrofauna surveys, for which standardised methods have been established. Benthic foraminifera are also good indicators of env...
Article
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Shallow water Antarctic cibicidids are traditionally identified as Cibicides refulgens or Cibicidoides lobatulus. However, a recent phylogenetic study based on SSU rDNA sequence data has demonstrated that these Antarctic cibicidids form a well-supported clade that branches sister to Mediterranean C. refulgens and is only distantly related to C. lob...
Article
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The Caspian Sea has no endemic Scyphozoa. In 1999, a mass accumulation of Aurelia medusae was recorded, indicating that sometime earlier, jellyfish had invaded the basin, but since then no scyphozoans have been reported in the Caspian. In the fall of 2008, we found scyphistomae (scyphoid polyps) during a cruise to the eastern Middle Caspian. The sc...
Article
Full-text available
Multi-proxy analyses including hydrographical, geochemical, foraminferal, lithological and geophysical data from the two fjords Sassenfjorden and Tempelfjorden provide information about modern sedimentary environments and help to understand the development of environmental conditions in central Spitsbergen (European Arctic) during the Late Weichsel...
Article
Full-text available
Multiproxy analyses including hydrographical, geochemical, foraminferal, lithological and geophysical data reveal variable influences of the glaciers Tunabreen and von Postbreen as well as the river Sassenelva on the sedimentary environment in two Spitsbergen fjords during the Late Weichselian and the Holocene. Grounded ice covered the study area d...
Chapter
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В настоящей работе представлены наиболее существенные результаты по биостратиграфии четвертичных отложений и палеоокеанологическим реконструкциям, полученные авторами в течение 2006-2008 гг. Все микропалеонтологические исследования, включая отбор проб для изотопно­ кислородного и изотопно-углеродного анализов, выполнены авторами данной работы. Биос...
Article
Full-text available
We present living (stained) benthic foraminifera assemblage data in nine surface sediment samples from the central Barents Sea collected in 2005 and 2006. The abundances of 20 selected species are compared to those from previously published total fauna assemblages of nearby samples. Between 1 and 3 total fauna samples from various years (between 19...
Article
Full-text available
Relict Lake Mogilnoe, which is a unique object on the Murmansk coast, is located in the southeastern part of Kildin Island. Despite a history of almost a century and a half of geomorphological research of the island, the beginning of which should be related to 1860 when A. Middendorf [1] published a description of the three main terraces of Kildin...
Article
Full-text available
Monothalamous (single-chambered) foraminifers are a major component of the benthic meiofauna in high latitude regions. Several morphologically similar species are common in the Arctic and Antarctic. However, it is uncertain whether these morphospecies are genetically identical, or whether their accurate identification is compromised by a lack of di...
Article
Full-text available
Detailed stratigraphic investigations of a high resolution sediment core from the Arctic fjord, Van Mijenfjorden, Svalbard, reveal significant reductions in benthic foraminiferal delta18O of 0.4 ° and 0.2-0.3 ° dated to respectively ca. 8200 and 8450 cal. yr BP. These reductions, combined with changes in the benthic foraminiferal fauna and IRD, ind...
Article
The history of postglacial emergence on the Murman coast, Kola Peninsula, is reconstructed based on twelve new radiocarbon ages from three marine sections and regional shoreline observations. Two pronounced shore levels are recognized below the Late Weichselian marine limit. The lower shoreline (11 -16 m a.s.l.) is associated with a transgression d...
Article
New sedimentological results are presented from Sagfjorden, a `tributary' fjord of Vestfjorden in northern Norway. The 0.5m box core, JM03-497 (67o 58'17N, 15o 21.73'E), was recovered from 547 m water depth. Pb210 dating of the core indicates upper sediments have a very high temporal resolution of ca. 7yrs/cm. This is the first record of such high...
Article
Full-text available
Monothalamous foraminifera were abundant in sediment samples from fjords and offshore areas around western Svalbard (water depth range 26-2472 m). The >500 µm fractions of samples from the inner parts of fjords yielded numerous delicate ‘‘allogromiids’’ (organic-walled) ‘‘saccamminids’’ and ‘‘psammosphaerids’’ (agglutinated), including species assi...
Article
Full-text available
Monothalamous foraminifera were abundant in sediment samples from fjords and offshore areas around western Svalbard (water depth range 26-2472 m). The > 500 mu m fractions of samples from the inner parts of fjords yielded numerous delicate "allogromiids" (organic-walled) "saccamminids" and "psammosphaerids" (agglutinated), including species assigne...
Article
Two sediment cores from the West Spitsbergen area, Euro-Arctic margin, MD99-2304 and MD99-2305, have been investigated for paleoceanographic proxies, including benthic and planktonic foraminifera, benthic foraminiferal stable isotopes and ice rafted debris. Core MD99-2304 is located on the upper continental margin, reflecting variations in the infl...
Article
Full-text available
Current ecological conditions in the regions of Bol'shoi Keretskii raid and Glubokaya Salma (Kandalaksha Bay, White Sea) were evaluated on the basis of structural and dynamic indices of the upper sediments in the context of specific composition of the benthic foraminiferal community. The distribution of the main species of living foraminifers was d...
Data
Two sediment cores from the West Spitsbergen area, Euro-Arctic margin, MD99-2304 and MD99-2305, have been investigated for paleoceanographic proxies, including benthic and planktonic foraminifera, benthic foraminiferal stable isotopes and ice rafted debris. Core MD99-2304 is located on the upper continental margin, reflecting variations in the infl...
Article
An analysis of the composition and quantitative pattern of distribution of the benthic foraminifers in the bottom sediments collected at six stations at depths of 20 to 155 m in the southeastern part of Kandalaksha Bay of the White Sea revealed their relation to the type of sediments and different hydrological characteristics. At relatively shallow...
Article
Full-text available
Allogromiids sensu lato, including the orders Allogromiida and Astrorhizida, are a commonly ignored group of marine benthos. Allogromiid standing crop was examined in 121 sediment samples from the Barents and Kara seas. In 44 of these samples, foraminiferal biomass was determined by calculation of cytoplasmic volume. Foraminiferal standing crop is...
Article
Full-text available
Calcareous foraminifers and hydrographic parameters in 113 bottom samples from the southern Kara Sea were examined to improve the usage of foraminifers as paleoenvironmental proxies for river-dominated high-latitude continental shelves. Foraminif-eral taxa form a succession from near-estuarine to distal open-sea locations, characterized by a gradua...
Article
Full-text available
Seasonal variations in benthic foraminiferal populations from a sediment-laden fjord were analyzed in order to provide insights into arctic foraminiferal ecology and to improve the interpretation of the late-glacial record, The fjord is 25 km long and 100 m deep with a large tidewater glacier at the fjord head. A pilot transect of eight stations sa...
Article
Full-text available
The abundance of large agglutinated tests in brown oxidized mud has suggested that high biomasses of foraminifera occur in troughs on the western Arctic Eurasian shelf. To verify this, we measured foraminiferal biomass (protoplasmic volume) at seven stations close to 80°N in the St. Anna Trough, a shelf depression open to the Arctic Basin. The abun...
Article
Full-text available
Living and dead foraminifera have been investigated along three transects away from tidewater glaciers of northern Novaya Zemlya. There are three glacier-proximal dominant foraminiferal taxa: Allogromiina (unidentified species), Elphidium excavatum f. clavata, and Cassidulina reniforme. In this environment the sediment consists of ice-front diamict...
Article
Full-text available
One of the largest uncertainties in ice-volume changes during the late Quaternary Period is the extent of ice sheets over the Barents and Kara seas. Field research on central and eastern Franz Josef Land, Russia, provide new observations on postglacial emergence and deglaciation that further constrain the magnitude and timing of late Weichselian gl...
Article
Full-text available
We investigated the total (live + dead) benthic foraminiferal fauna from six Svalbard fjords, European Arctic. The fauna relates to various environmental variables including properties of the water masses, influence of nearby glaciers, and surface sediment characteristics. Six benthic foraminiferal assemblages are distinguished. Two of these are do...
Article
Uncertainty remains on the timing and extent of Late Weichselian glaciers over the Barents and Kara sea shelves. Franz Josef Land, Russia, is a critical area for deciphering the record of glacier fluctuations and postglacial relative sea-level change. Coastal forelands on the archipelago are covered by a well-preserved raised-beach sequence contain...
Article
The porcelain inlay technique was described over a century ago, and, although not yet used as a routine restorative procedure, may prove to provide restorations of unsurpassed functional and aesthetic qualities in certain situations. The aim of this study was to investigate the handling properties and clinical characteristics of a porcelain inlay s...
Article
Three concentrations (25, 50 and 100 mg/kg body weight) of fresh garlic (Allium sativum L.) were administered daily by gavage to Swiss albino mice for different durations up to 60 days. These concentrations had been observed to protect significantly against effects of known clastogens. The endpoints scored were frequencies of chromosomal aberration...
Article
A study of two piston cores and a 3.5 kHz seismic profile from the Franz Victoria Trough provides new stratigraphic, stable isotopic and foraminiferal AMS 14C data that help constrain the timing of ice-sheet retreat in the northern Barents Sea and the nature of the deglacial marine environment. Silty diamicton at the base of each core, interpreted...
Article
The history of postglacial emergence on the Murman coast, Kola Peninsula, is reconstructed based on twelve new radiocarbon ages from three marine sections and regional shoreline observations. Two pronounced shore levels are recognized below the Late Weichselian marine limit. The lower shoreline (11 - 16 m a.s.l.) is associated with a transgression...
Article
Foraminifera were examined in recent (<100 years) fine-grained glaciomarine muds from surface sediments and cores from Nordensheld Bay, Novaja Zemlja, and Hornsund and Bellsund, Spitsbergen. This study presents the first data on modern foraminifera distribution for fjord environments in Novaja Zemlja, Russia. The data are interpreted with reference...
Article
Full-text available
Reconstructions of late Weichselian glacier coverage on the continental shelves of the Russian Arctic range from a large ice sheet terminating in northern Siberia to isolated ice caps restricted to Arctic archipelagos. This disparity in glacier reconstructions reflects the lack of chronological control on glacial and deglacial landforms. We present...