Svetlana Borisovna (patronymic name) KruglikovaP.P. Shirshov Institute of Oceanology · Laboratory of paleoecology and biostratigraphy
Svetlana Borisovna (patronymic name) Kruglikova
Doctor of science
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42
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Introduction
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July 1960 - present
Publications
Publications (42)
The high-latitude Northern Hemisphere is a key region in the global climate balance. Variations in sea-ice extent affect biological productivity, CO 2 exchange and carbon drawdown. Marine proxies indicative of proximity of the ice-marginal zone are therefore essential to understand these processes. Amphimelissa setosa is nowadays a dominant radiola...
Climatic and oceanographic processes in the Pacific Ocean have global implications. Reliable sedimentary proxies in this region are thus necessary to understand the magnitude of past climate variability. Radiolarian assemblages are of particular relevance in some regions of the Pacific Ocean where other proxies are either poorly preserved or are bi...
We report on the changing radiolarian faunas from the Younger Dryas (ca.12.9 calibrated thousands of years BP [cal. Ky BP]) and into the Holocene (ca. 10.3 cal. Ky BP) in the core JM99-1200 from Andfjorden, northern Norway. Temperature reconstructions using both the Q-mode factor analysis and modern analogue technique methods show stable, cold temp...
The environmental system of the northern Nordic Seas is very sensitive to oceanographic and climatic changes at the contact of cold Arctic and warmer North Atlantic waters. These contrasts are reflected in the associations of marine microorganisms and archived in the bottom sediments. A microfossil study (diatoms, coccoliths) of late Holocene sedim...
The vertical distribution of radiolarians was investigated using a vertical multiple plankton sampler (100– 0, 250–100, 500–250, and 1000–500 m water depths, 62 µm mesh size) at the Northwind Abyssal Plain and southwestern Canada Basin in September 2013. To investigate seasonal variations in the flux of radiolarians in relation to sea ice and water...
A comparison of micropaleontological data on the distribution of the Cycladophora davisiana radiolarian species in the surface sediment layer and the Late Quaternary sediments from the Subarctic Pacific and Far East marginal seas allowed conclusions concerning the possible conditions and occurrence of intermediate waters during the last glacial max...
Amphimelissa setosa is at present a species endemic to the Arctic province: the Arctic Ocean proper and its marginal seas. In the North Pacific Ocean and the Okhotsk Sea, its first occurrence was at 1.03 Ma and it became locally extinct at 72 ka. Its first recorded occurrence in the North Atlantic is at IODP Site U1314 at 414 ka in MIS 11, which is...
The vertical distribution of radiolarians was investigated using a vertical multiple plankton sampler (100–0, 250–100, 500–250 and 1000–500 m water depths, 62 μm mesh size) at the Northwind Abyssal Plain and southwestern Canada Basin in September 2013. To investigate seasonal variations in the flux of radiolarians in relation to sea-ice and water m...
Plankton samples obtained by the Norwegian Polar Institute (August, 2010) in an area north of Svalbard contained an unusual abundance of tropical and subtropical radiolarian taxa (98 in 145 total observed taxa), not typically found at these high latitudes. A detailed analysis of the composition and abundance of these Radiolaria suggests that a puls...
Analyses based on complete faunas are more reliable than those based on a few species. To minimize errors in identification due to geographical and ecological variations in skeletal morphology, as well as taxonomic "noise" caused by ontogenetic stages, the polycystine radiolarian fauna was grouped into 20 high-rank taxa (HRT); 12 Spumellaria and 8...
The authors have established that, not earlier than 9000–10000 years ago, the main part of the modern fauna of polycystines
(Polycystina, Radiolaria) migrated (and still continues to so do) from the Norwegian Sea into the Central Arctic Basin and
the marginal seas of the Arctic Ocean’s Eurasian sector. Polycystines penetrate into the seas of the Am...
We have found that species within high-rank taxa, with the exception of Actinommidae and Eucyrtidiidae, covary across environments in the Nordic Seas. One possible explanation is converging ecological requirements within taxonomic groups. Over the last decade, relative abundance data of species-level taxa have been successfully used to reconstruct...
Evidence, based on the species and high rank taxa composition and level of domination, skeletal morphological diversity and distributional data of radiolaria from sediment samples, is presented in support of a hypothesis of endemism for the Arctic polycystine fauna, especially arctic actinommids, as presented in the Discussion section. The arctic a...
Bipolarity, its history and general interpretation are investigated and discussed herein. Apart from the classical view, namely that a bipolar distribution is a peculiar biogeographical phenomenon, we propose that it is ecologically controlled too. This approach was used for bipolarity assessment within the following groups: Phaeodaria, Nassellaria...
The polycystine radiolarian faunas in the Arctic Ocean, including the adjacent Arctic seas, have been studied in more than 377 surface samples. The deep basins in the Arctic Ocean have revealed 31 polycystine radiolarian species (11 spumellarians and 20 nassellarians). The polycystine radiolarian fauna in the southern Norwegian Sea was introduced f...
Results of a complex micropaleontological research of the samples obtained from a test area on the
North Yamato Rise are presented. Radiolarians, diatoms, and palynocomplexes were examined. Neogene
deposits from the beginning of the Middle Miocene to the end of the Late Miocene were identified. Coastal,
shelf, and slope deposits were recognized wit...
The area studied is characterized by a regional stratigraphic gap from the early Miocene up to the Quaternary. Deposits from the late Eocene to the early Miocene were revealed at the bottom surface or under a thin sedimentary cover. Ferromanganese nodules, mostly of the Oligocene age, are deposited over the surface layers of the Tertiary or Quatern...
The area is characterized by regional stratigraphic hiatus from the Early Miocene up to the Quaternary. Numerous
manganese nodules mostly of the Oligocene age are located on a bottom surface on Tertiary or Quaternary
deposits. Detailed micropaleontological research of a block of ancient dense clay covered by the manganese
crust is carried out. Radi...
The radiolarian complexes were investigated in sediments, in manganese nodules located on the
bottom surface mainly on a thin layer of the Quaternary sediments, and in sediment covered by
manganese crust. A continuous sequence of radiolarian biostratigraphic zones from the Late
Eocene to the Early Miocene (40-17 million years) and a regional hiatus...
Radiolaria were studied in 19 manganese nodules raised from the bottom. The nodules occurred mainly on the surface of thin Quaternary sediments covering the Tertiary deposits of various ages (Middle Eocene to Early Miocene). Radiolaria in nodule cores and in inner and surface layers were studied. We found 85 radiolaria species and groups of species...
The Tertiary sediments were found in two areas on the bottom surface or under a thin layer of the Quaternary sediments. Combined investigations into radiolaria, diatoms and planktonic foraminifera have shown a continuous sequence of biostratigraphic zones from the Late Eocene to the Early Miocene and the regional hiatus between 17 and 1 m.y. The Ea...
The modem understanding of the Quaternary oceanic sediments stratigraphy is discussed in terms of climatostratigraphic methods (the rations between the relatively cold-water and warm-water species, micropaleontologic paleotemperature analysis based on the structure of the planktonic foraminifera thanatocoenoses, oxygen isotope method) and biostrati...
Radiolaria were studied in 19 manganese nodules raised from the bottom. The nodules occurred mainly on the surface of thin Quaternary sediments covering Tertiary deposits of various ages (Middle Eocene to Early Miocene). Radiolaria in nodule cores and in inner and surface layers were studied. We found 85 radiolaria species and groups of species. Us...
. Investigations of radiolaria, diatoms, and planktic foraminifera showed that
Tertiary outcrops are distributed on the bottom or under a thin layer of Quaternary sediments. The continuous sequence of radiolarian biostratigraphic zones from the Late
Eocene to the Early Miocene (40-17 million years) and the regional hiatus between 17
and 1 million y...
Different aspects of the ecology and biogeography of radiolarians are considered as a means of interpreting the paleoenvironment. The quantitative and spatial distribution of radiolarians in the sediments of the world ocean are discussed, including differences between marine and oceanic thanatocoenoses, relations between species and high rank assoc...
Radiolaria are unicellular planktonic animals inhabiting all oceans and seas with salinities from 32–38‰. There is no record of their occurrence in seas with lower salinity (the Black, Baltic, and Beloye seas); in near-shore regions the radiolarian abundance and diversity drop sharply. The vertical distribution of Radiolaria ranges from surface to...
The presence of >30 species of radiolaria-Polycystina (Nasselaria and Spumellaria) was established for the first time in the surface layer of bottom sediments. They included Arcto-boreal cosmopolites and species. No species endemic in the Arctic were discovered. Radiolaria in deposits from the lower Arctic seas were the most numerous and varied. Th...
Обнаружены неогеновые отложения среднего миоцена (15-14 млн. лет), позднего миоцена и раннего плиоцена и плиоцен-квартера. Возраст определен по диатомеям, радиоляриям, фораминиферам и палинологическим данным. Найдены позднемиоценовые фосфориты. По геоморфологии, составу осадков, микропалеонтологическим и некоторым геофизическим данным прослежены ос...
Information on the numbers of 8 taxa of Radiolaria (Cyrtoidae, Discoidea, Larcoidea, Spyroidea, Botryoidae, Collospheridae, Prunoidea and Spharoidea) in 97 samples from the surface layer of oceanic sediments from the boreal zone of the Pacific ocean was used to reconstruct palaeoenvironmental conditions. Factor analysis was used to reconstruct the...
BARASH M.S., DMITRENKO O.B., KAZARINA G.Kh., KRUGLIKOVA S.B.,MUKHINA V.V.,
STRATIGRAPHY OF QUATERNARY OCEANIC DEPOSITS
Quaternary oceanic deposits is the most suitable object for perform¬ing Quaternary stratigraphy as they often contain continuous record of all environmental changes. For this purpose several methods are used: paleomagnetic, oxyge...
Projects
Projects (5)
Research of Tertiary sediments of the oceans and seas, their stratigraphy, reconstruction of paleooceanological conditions. The study of the processes of manganese and phosphorite nodules formation
Biostratigraphic subdivision and definition of the Quaternary age of ocean and marine sediments using micropaleontological and other methods. Reconstruction of paleo environment conditions (paleotemperatures, currents, hydrological fronts, distribution of ice, etc..). Correlation. Paleoclimatic reconstructions. Extrapolation of methods to earlier stratigraphic intervals and the corresponding constructions.
