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    Tytuł:
    Pelagic Polychaeta in the Scotia Front west of Elephant Island (BIOMASS III, October—November 1986)
    Autorzy:
    Siciński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2053216.pdf
    Data publikacji:
    1988
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctica
    pelagic Polychaeta
    BIOMASS III
    Źródło:
    Polish Polar Research; 1988, 9, 2-3; 277-282
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    VRML visualization of pelagic fish movement in the echosounder beam
    Autorzy:
    Moszyński, M.
    Bikonis, K.
    Demkowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332747.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    VRML
    pelagic
    fish
    echosounder beam
    Opis:
    During over thirty years of development of echosounders, the acquisition software has developed different kind of charts for data visualization. In the paper the concept of creation of dynamic echograms from the data acquired in acoustical surveys is presented. As the modern split-beam echosounders allow for nonambiguous localization of targets in the water column, it is possible to visualize them in 3D coordinate system. Virtual Reality Modeling Language VRML is a popular language used in modeling of virtual reality. Using its build-in properties, it is relatively easy to visualize movement of fish treated as an object in any coordinate system. VRML despite the typical application in computer graphics is also used in other various fields. For instance in chemistry it is used for visualization of atom particles, in medicine for modeling of human organs, in astronomy for visualization of trajectories of the stars and in geography and navigation for creation of 3D maps. Hence, in this paper we describe its application in fisheries. Additionally, as the any WWW browser can be equipped with VRML plugin 3D fish visualization can be redistributed in the Internet.
    Źródło:
    Hydroacoustics; 2003, 6; 53-58
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fishes in pelagic catches in the South Shetlands area (BIOMASS III, October—November 1986 and January 1987)
    Autorzy:
    Skóra, Krzysztof E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2053201.pdf
    Data publikacji:
    1988
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctica
    pelagic juvenile fishes
    BIOMASS III
    Źródło:
    Polish Polar Research; 1988, 9, 2-3; 367-383
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Summer hydrology and zooplankton in two Svalbard fiords
    Autorzy:
    Węsławski, J. Marcin
    Jankowski, Andrzej
    Kwaśniewski, Sławomir
    Swerpel, Sławomir
    Ryg, Morten
    Powiązania:
    https://bibliotekanauki.pl/articles/2052815.pdf
    Data publikacji:
    1991
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    fiords hydrology
    zooplankton
    pelagic food base
    Źródło:
    Polish Polar Research; 1991, 12, 3; 445-460
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Visean pelagic chondrichthyans from northern Europe
    Autorzy:
    Ginter, M.
    Duffin, C.J.
    Dean, M.T.
    Korn, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/22095.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Late Visean
    pelagic fauna
    chondrichthyan
    tooth
    Carboniferous
    Europe
    Opis:
    The relatively rich assemblages of shark teeth from pelagic limestone (Mississippian, late Viséan, late Asbian-middle Brigantian) of three northern European regions: the Rhenish Mountains (Westenfeld Quarry, Germany), the Holy Cross Mountains (Todowa Grząba at the edge of Ostrówka Quarry, Poland), and Derbyshire (Cawdor Quarry, Matlock, England, UK) display certain similarities, with the absolute predominance of the teeth of Falcatidae (small Symmoriiformes) and the constant presence of Thrinacodus spp. The largest and most diverse assemblage from Todowa Grząba contains at least three species of a falcatid Denaea, a xenacanthimorph Bransonella nebraskensis, a newly described phoebodontid Thrinacodus dziki sp. nov., a few ctenacanthiform and euselachian teeth, and two abraded euchondrocephalan dental elements. Anachronistidae, common in the most of late Viséan pelagic faunas, are absent from Todowa Grząba and Westenfeld. The material under study differs from the shallow-water chondrichthyan fauna, hitherto described from the Mississippian carbonate platform facies, by its taxonomic content (particularly almost total absence of Euchondro-cephali), generally lower diversity, and higher frequency of small teeth.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution and population structure of pelagic Ostracoda near the sea-ice edge in the Scotia Sea and off the King George Island (December 1988 January 1989)
    Autorzy:
    Błachowiak-Samołyk, Katarzyna
    Osowiecki, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2052112.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctic
    pelagic Ostracoda
    vertical distribution
    horizontal distribution
    population structure
    Źródło:
    Polish Polar Research; 2002, 23, 2; 135-152
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unconformity surfaces in pelagic carbonate environments : A case from the Middle Bathonian of the Betic Cordillera, SE Spain
    Autorzy:
    Nieto, L. M.
    Rodríguez-Tovar, F. J.
    Molina, J. M.
    Reolid, M.
    Ruiz-Ortiz, P. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/191710.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Unconformity
    pelagic swell
    softground
    firmground
    hardground
    Middle-Late Jurassic
    Betic External Zone
    Opis:
    Integrative studies of sedimentary and palaeontological topics for unconformity surfaces are useful in basin analysis. A middle Bathonian unconformity surface in the Ammonitico Rosso facies cropping out in the La Mola Unit (Subbetic Domain, Betic External Zone) was studied by integrating ichnological, palaeotectonic, and sedimentological analyses to decipher sea-level, tectonic, and palaeogeographic conditions during its development. The trace-fossil assemblage mainly consists of the Glossifungites (Thalassinoides, Arenicolites, and Gastrochaenolites) and Trypanites ichnofacies elements. Probable Ophiomorpha represents previous softground stages, Thalassinoides and Arenicolites were formed in firmground, Gastrochaenolites reflects an evolved firmground or early hardground, and Trypanites can be attributed to an incipient hardground. The degree of firmness, relative sea-level position, and continuity of deposition were related. The softground stage corresponds to a fall in relative sea level and continued deposition. The firmground (semi-consolidated substrate) probably reflects an extremely low sea level characterized by non-deposition, whereas the incipient hardground stage indicates an initial phase of relative sea-level rise, with an increase in marine current energy. The presence of two neptunian dyke systems reflects significant tectonic activity related to the transtensional deformation that affected the South Iberian Palaeomargin. Lateral variations in sedimentological and ichnological features recorded at similar discontinuity surfaces in nearby areas were considered and related to differences in bottom topography, with associated changes in sedimentation, and to the variable duration of the hiatus.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2014, 84, 3; 281-295
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of Northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat
    Autorzy:
    Abdelouahab, H.
    Berraho, A.
    Baibai, T.
    Larissi, J.
    Charib, S.
    Agouzouk, A.
    Makaoui, A.
    Ettahiri, O.
    Errhif, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079005.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    pelagic fish
    sardine
    Sardina pilchardus
    population dynamics
    environment change
    spawning
    sea surface
    temperature
    Atlantic coast
    Opis:
    Small pelagic fish such as sardine show strong recruitment variability often associated with environmental changes influencing the spawning process and ultimately, affecting population dynamics. Sardine (Sardina pilchardus, Walbaum 1792) is one of the most exploited pelagic species along the northwest African coast. The main spawning occurs during the cold season (autumn—winter). A time-series autumn—winter surveys extending from 1994 to 2015 sampled sardine eggs, along the southern area of the Moroccan Atlantic coast (26°N—21°N) were analyzed. The present work focuses on examining the inter-annual variability of the spawning habitat by analyzing the spatial-temporal variability of sardine egg distribution and density extracted from the data collected over the period 1994—2015. Generalized additive models (GAM) were used to detect the relationships between the sardine distribution, expressed as egg density and the presence or absence data and relevant hydrobiological environmental variables, such as salinity, temperature and zooplankton biomass. The generalized additive models showed significant relationships between the environment variables (SST, SSS and Zooplankton biomass) and sardine density, but not with sardine presence. Given that the study area is characterized by high mesoscale features and significant upwelling activities, the variability of upwelling processes could explain the changes of spawning ground position and thermal window
    Źródło:
    Oceanologia; 2021, 63, 1; 1-11
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pelagic coelenterates in the waters of the western part of the Egyptian Mediterranean Coast during summer and winter
    Autorzy:
    Zakaria, H.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/48385.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    hydromedusa
    pelagic coelenterate
    Mediterranean Sea
    zooplankton
    Coelenterata
    siphonophore
    summer
    winter
    Egyptian Mediterranean Coast
    water
    distribution
    Opis:
    During August 2000 and February 2001 two cruises were carried out along the Egyptian Mediterranean Coast on the Egyptian r/v ‘El-Yarmouk’. The samples collected were used to study the ecology and distribution of hydromedusae and siphonophores during summer and winter. The density of hydromedusae was high in the inshore waters during summer (av. 71 org × 100 m−3), decreasing to 28 organisms per 100 m3 in the oceanic waters; in winter they were more abundant in the middle and offshore zones. Ato tal of 9 hydromedusae species were recorded during the present study, 8 of them in summer. The most common of these were Aglaura hemistoma, Olindias singularis, Liriope tetraphylla and Geryonia proboscidalis. Only 4 species were recorded during winter, including Cunina octonaria, which was not recorded during the summer. The nine species recorded in the present study are circumtropical. The siphonophore density was high in summer. In winter, the average standing crop of siphonophores fell to about 30% of that recorded in summer. 11 siphonophore species were recorded, 10 of them in summer; Cucullus campanula and Eudoxoides spiralis were the most common. Only 6 species were recorded in winter. These 11 species are widely distributed – they have been recorded from the Atlantic, Indian and Pacific Oceans. Strong seasonality is thus a striking feature of Egyptian Mediterranean waters. Temperature is the most variable factor affecting the planktonic community, fluctuating between 26.5 and 27◦C in summer and between 16.3 and 17.5◦C in winter. The western part of the Egyptian coast, the area under study in this work, is poorly diversified in comparison with the eastern part.
    Źródło:
    Oceanologia; 2004, 46, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diatoms of the Rosnowskie Duze Lake in the Wielkopolska National Park in the years 2002 and 2003
    Okrzemki jeziora Rosnowskiego Duzego w Wielkopolskim Parku Narodowym w latach 2002 i 2003
    Autorzy:
    Celewicz-Goldyn, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/878492.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Tematy:
    nymphaeid
    Wielkopolski National Park
    Polska
    elodeid
    helophyte
    eutrophic lake
    phytoplankton
    Lake Rosnowskie Duze
    taxonomy
    diatom
    pelagic zone
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2006, 10
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Baltic herring (Clupea harengus membras) spawning grounds on the Lithuanian coast: current status and shaping factors
    Autorzy:
    Saskov, A.
    Siaulys, A.
    Bucas, M.
    Daunys, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/47793.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic herring
    Clupea harengus membras
    spawning season
    geomorphology
    bathymetry
    Lithuania
    Baltic Sea
    coastal water
    pelagic ecosystem
    water temperature
    Źródło:
    Oceanologia; 2014, 56, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pelagic phytoplankton in four basins of the Rosnowskie Duze Lake in the Wielkopolska National Park
    Charakterystyka fitoplanktonu pelagicznego czterech basenow jeziora Rosnowskiego Duzego w Wielkopolskim Parku Narodowym
    Autorzy:
    Celewicz-Goldyn, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/878496.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Tematy:
    Wielkopolski National Park
    Polska
    green alga
    eutrophic lake
    botany
    phytoplankton
    Lake Rosnowskie Duze
    shallow lake
    lake basin
    pelagic zone
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2005, 08
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the winter phytoplankton bloom on the settled material in a temperate shallow estuary
    Autorzy:
    Guinder, V.A.
    Lopez-Abbate, M.C.
    Berasategui, A.A.
    Negrin, V.L.
    Zapperi, G.
    Pratolongo, P.D.
    Fernandez Severini, M.D.
    Popovich, C.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47931.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton bloom
    chlorophyll a
    sediment trap
    resuspension
    shallow estuary
    pelagic food web
    nutrient concentration
    particulate organic matter
    coastal environment
    Źródło:
    Oceanologia; 2015, 57, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and distribution of phage-like particles in a eutrophic boreal lagoon
    Autorzy:
    Sulcius, S.
    Staniulis, J.
    Paskauskas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/47555.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    aquatic ecosystem
    Baltic Sea
    biodiversity
    Curonian Lagoon
    distribution
    electron microscopy
    morphology
    pelagic ecosystem
    spatial distribution
    virus
    virus-like particle
    Opis:
    In this paper we present the results of direct observations of the morphology and size of phage-like particles by means of transmission electron microscopy (TEM) as a function of their spatial distribution in the shallow highly productive Curonian Lagoon of the Baltic Sea. In total, 26 morphologically different forms of phagelike particles were found. Different trends of distribution in terms of abundance, size and shape of virus-like particles were demonstrated. The total abundance of viruses varied from 1.91×107 ml−1 to 5.06×107 ml−1. The virus to bacteria ratio (VBR) changed from 15.6 to 49 and was negatively associated with total bacterial numbers (r = −0.60; p < 0.05). The phages of family Myoviridae were the most diverse and were dominant at all stations.
    Źródło:
    Oceanologia; 2011, 53, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phycoflora in the basin of the Rosnowskie Duze Lake exposed to anthropopressure
    Fykoflora basenu jeziora Rosnowskiego Duzego poddanego antropopresji
    Autorzy:
    Celewicz-Goldyn, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/878458.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Tematy:
    Wielkopolski National Park
    Polska
    green alga
    qualitative analysis
    quantitative analysis
    phycoflora
    anthropopressure
    phytoplankton
    Lake Rosnowskie Duze
    eutrophication
    pelagic zone
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2006, 10
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Abundance of Dinobryon divergens Imhoff in the eutrophic Lake Rosnowskie Duze in 2002-2003
    Udzial zlotowiciowca Dinobryon divergens Imhoff w strukturze ilosciowej fitoplanktonu eutroficznego jeziora Rosnowskiego Duzego w latach 2002-2003
    Autorzy:
    Celewicz-Goldyn, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/878333.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Tematy:
    littoral zone
    Wielkopolski National Park
    Polska
    Dinobryon divergens
    eutrophic lake
    botany
    phytoplankton
    Lake Rosnowskie Duze
    Wielkopolska region
    shallow lake
    pelagic zone
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2005, 09
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decadal fluctuations in North Atlantic water inflow in the North Sea between 1958-2003: impacts on temperature and phytoplankton populations
    Autorzy:
    Leterme, S.C.
    Pingree, R.D.
    Skogen, M.D.
    Seuront, L.
    Reid, P.C.
    Attrill, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48966.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton
    continental slope
    ocean circulation
    plankton
    Atlantic water
    plankton community
    climate
    temperature
    dynamics
    fluctuation
    pelagic ecosystem
    North Sea
    circulation
    population
    sea surface temperature
    Opis:
    The circulation of Atlantic water along the European continental slope, in particular the inflow into the North Sea, influences North Sea water characteristics with consequent changes in the environment affecting plankton community dynamics. The long-term effect of fluctuating oceanographic conditions on the North Sea pelagic ecosystem is assessed. It is shown that (i) there are similar regime shifts in the inflow through the northern North Sea and in Sea Surface Temperature, (ii) long-term phytoplankton trends are influenced by the inflow only in some North Sea regions, and (iii) the spatial variability in chemicophysical and biological parameters highlight the influence of smaller scale processes.
    Źródło:
    Oceanologia; 2008, 50, 1; 59-72
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of the inflow of Vistula river waters on the pelagic zone in the Gulf of Gdansk
    Autorzy:
    Wielgat-Rychert, M.
    Ameryk, A.
    Jarosiewicz, A.
    Kownacka, J.
    Rychert, K.
    Szymanek, L.
    Zalewski, M.
    Agatova, A.
    Lapina, N.
    Torgunova, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/48898.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    Gdansk Gulf
    Vistula River
    river water
    pelagic zone
    planktonic bacteria
    phytoplankton
    biological parameter
    chlorophyll a
    enzyme activity
    inorganic nitrogen
    phytoplankton biomass
    electron transport system
    Źródło:
    Oceanologia; 2013, 55, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New data on the age and stratigraphic relationships of the Czajakowa Radiolarite Formation in the Pieniny Klippen Belt (Carpathians) based on the radiolarian biostratigraphy in the stratotype section
    Autorzy:
    Bąk, M.
    Chodacka, S.
    Bąk, K.
    Okoński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/139119.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Middle-Late Jurassic
    radiolaria
    taxonomy
    biostratigraphy
    Czajakowa Radiolarite Formation
    pelagic siliceous facies
    Pieniny Klippen Belt
    Carpathians
    jura
    promienica
    taksonomia
    biostratygrafia
    Czajakowa Skała
    radiolaryty z Czajakowej
    Pieniński Pas Skałkowy
    Karpaty
    Opis:
    The radiolarian biostratigraphy of the Middle–Upper Jurassic pelagic siliceous sediments (Czajakowa Radiolarite Formation) in the Niedzica succession of the Pieniny Klippen Belt (Carpathians) is interpreted in terms of their age in a stratotype section, and facies equivalents in other tectonic-facies units of this region. The siliceous sediments are represented by radiolarian cherts and silicified limestones which are underlain and overlain by red nodular limestones, equivalents of the Rosso Ammonitico facies. The radiolarian association includes thirty-seven taxa belonging to twenty one genera which represent the Northern Tethyan Palaeogeographic Province. Key radiolarians recorded provide a means of correlation with zonation schemes based on Unitary Associations defined for the Jurassic Tethyan sediments. The age of the Czajakowa Radiolarite Formation in the stratotype section is determined as U.A.Z.9 to U.A.Z.11 corresponding to middle Oxfordian up to Kimmeridgian. Comparison of radiolarian biozones from the stratotype section with other facial equivalent sections in the Pieniny Klippen Belt reveals a significant diachronism for both the lower and the upper limits of the Jurassic pelagic siliceous facies.
    Źródło:
    Acta Geologica Polonica; 2018, 68, 1; 1-20
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Marine snow and epipelagic suspensoids in the Reda carbonates and a pronounced mid-Ludfordian (Silurian) CIE in the axis of the Baltic Basin (Poland)
    Autorzy:
    Kozłowski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/1835581.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pelagic carbonates
    Sparoids
    marine snow
    algal blooms
    eolian dust
    carbonate supersaturation
    euxinia
    Baltic basin
    Reda Member
    ludlow
    Silurian
    węglany pelagiczne
    sparoidy
    śnieg morski
    zakwit glonów
    osady eoliczne
    basen bałtycki
    sylur
    Opis:
    The mid-Ludfordian pronounced, positive carbon isotope excursion (CIE), coincident with the Lau/kozlowskii extinction event, has been widely studied so far in shallow-water, carbonate successions, whereas its deep-water record remains insufficiently known. The aim of this research is to reconstruct the sedimentary environments and the palaeoredox conditions in the axial part of the Baltic-Podolian Basin during the event. For these purposes, the Pasłęk IG-1 core section has been examined using microfacies analysis, framboid pyrite diameter and carbon isotope measurements. The prelude to the event records an increased influx of detrital dolomite interpreted as eolian dust, coupled with a pronounced decrease in the diameter of the pyrite framboids, indicating persistent euxinic conditions across the event. The event climax is recorded as the Reda Member and consists of calcisiltites, composed of calcite microcrystals (‘sparoids’), which are interpreted as suspensoids induced by phytoplankton blooms in the hipersaturation conditions present in the epipelagic layer of the basin. Both the prelude and climax facies show lamination, interpreted as having resulted from periodical settling of marine snow, combined with hydraulic sorting within a ‘benthic flocculent layer’, which additionally may be responsible for a low organic matter preservation rate due to methanogenic decomposition. Contrary to the observed basinward CIE decline in the benthic carbonates in the basin, the Reda Member records an extremely positive CIE (up to 8.25‰). Given the pelagic origin of the sparoids, the CIE seems to record surface-water carbon isotope ratios. This points to a large carbon isotope gradient and kinetic fractionation between surface and bottom waters during the mid-Ludfordian event in a strongly stratified basin. The Reda facies-isotope anomaly is regarded as undoubtedly globally triggered, but amplified by the stratified and euxinic conditions in the partly isolated, Baltic-Podolian basin. Hence, the common interpretation of the basin record as representative for the global ocean needs to be treated with great caution.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 4; 529-567
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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