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  • 1
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    Unknown
    Late Holocene diatom abundaces in sediment core HC-11 (2016)
    PANGAEA
    In:  Supplement to: Tsoy, Ira B; Obrezkova, Maria S; Aksentov, KI; Kolesnik, Alexander N; Panov, V S (2017): Late holocene environmental changes in the Southwestern Chukchi Sea inferred from diatom analysis. Russian Journal of Marine Biology, 43(4), 276-285, https://doi.org/10.1134/S1063074017040113
    Details
    Publication Date: 2023-07-09
    Description: The study of diatoms in core HC11 collected from the southwestern part of Chukchi Sea, allowed to distinguish 3 diatoms ecological zones, reflecting paleoenvironmental changes during the last 2300 years. The sediment age was based on the sedimentation rates, determined by 210Pb and radiocarbon dating of mollusk shells. The environmental changes of Chukchi Sea revealed by examination of diatoms correlates with global climate changes - the warming of the early and middle Subatlantic and cooling of the late Subatlantic (Little Ice Age). Warming early and middle Subatlantic in the Chukchi Sea was probably stronger than the warming of the late 20th century and was not accompanied by significant changes in sea level.
    Keywords: Actinocyclus curvatulus; Actinocyclus ochotensis; Actinocyclus octonarius; Actinocyclus sp.; Actinocyclus subtilis; Actinoptychus senarius; Actinoptychus sp.; Amphora proteus; Amphora sp.; Aulacodiscus sp.; Bacterosira bathyomphala; Chaetoceros debilis; Chaetoceros diadema; Chaetoceros didymus; Chaetoceros furcellatus; Chaetoceros holsaticus; Chaetoceros ingolfianus; Chaetoceros lorenzianus; Chaetoceros mitra; Chaetoceros spp.; Chukchi Sea; Cocconeis costata; Cocconeis scutellum; Core; CORE; Coscinodiscus apiculatus; Coscinodiscus argus; Coscinodiscus asteromphalus; Coscinodiscus marginatus; Coscinodiscus oculus-iridis; Coscinodiscus radiatus; Cosmiodiscus insignis; Delphineis surirella; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Detonula confervacea; Dictyochophyceae; Diploneis smithii; Diploneis smithii var. rhombica; Diploneis subcincta; Distephanus speculum; Distephanus speculum minutus; Encyonema silesiacum; Entomoneis gigantea var. septentrionalis; Eunotia praerupta; Fossula arctica; Fragilariopsis cylindrus; Fragilariopsis oceanica; Fragilariopsis reginae-jahniae; Frustulia vulgaris; Grammatophora arcuata; Grammatophora marina; HC-11; Hyalodiscus obsoletus; Hyalodiscus scoticus; Hyalodiscus sp.; Melosira arctica; Melosira moniliformis var. octogona; Navicula directa; Navicula peregrina; Navicula transitans var. derasa; Neidium bisulcatum; Neodenticula seminae; Nitzschia angularis; Nitzschia hudsonii; Nitzschia polaris; Nitzschia scabra; Nitzschia sp.; Number of taxa; Odontella aurita; Paralia sulcata; Pauliella taeniata; Pinnularia borealis; Pinnularia brevicostata; Pinnularia lata; Pinnularia quadratarea var. cuneata; Pinnularia quadratarea var. subglabra; Pinnularia spp.; Pinnularia viridis; Placoneis placentula; Porosira glacialis; Proboscia alata; Proboscia subarctica; Pseudogomphonema arcticum; Pyxidicula zabelinae; Rhizosolenia hebetata; Rhizosolenia setigera; Rhizosolenia styliformis; Shionodiscus biporus; Shionodiscus latimarginatus; Shionodiscus oestrupii; Stellarima microtrias; Stephanopyxis horridus; Stephanopyxis nipponica; Stephanopyxis turris; Thalassionema nitzschioides; Thalassiosira anguste-lineata; Thalassiosira antarctica var. borealis; Thalassiosira baltica; Thalassiosira constricta; Thalassiosira eccentrica; Thalassiosira hyalina; Thalassiosira hyperborea; Thalassiosira nordenskioeldii; Thalassiosira spp.; Thalassiothrix longissima; Thalassiothrix robusta
    Type: Dataset
    Format: text/tab-separated-values, 3914 data points
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  • 2
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    Unknown
    Diatoms and their abundances in the Late Holocene sediments of Core LV77-3-1 from the southern part of Chukchi Sea (2019)
    PANGAEA
    Details
    Publication Date: 2024-02-10
    Description: Diatoms from 87 sediment samples of the Core LV77-3-1 collected in southern part of Chukchi Sea were examined to reconstruct paleoenvironments of last millennia and correlate with sediment geochemistry data obtained from the same Core. Diatoms in Core Lv77-3-1 are represented by 161 species belonging to 61 genus (table 1). The largest number of species is characteristic of the genera Chaetoceros (15 taxa), Navicula (12), Thalassiosira (10), Coscinodiscus (8), Diploneis (8), Actinocyclus (7). Most species are marine, among which are 62 planktonic, benthic - 63 species. Considerable amount of freshwater (24 taxa) and extinct (12 taxa ) species are encountered but they are single. Analysis of diatoms on a detailed age model showed the periodicity of sedimentation in the zone of influence of the Pacific waters of the Chukchi Sea in the Late Holocene, which is characterized by alternation of relatively cold and warm epochs. The reconstructed changes do not fully reflect the global climate changes of the late Holocene. It is assumed that a possible cause of the discrepancy between ice conditions and global temperature changes is the inflow of warm Pacific waters through the Bering Strait, which increases the duration of the ice-free period.
    Keywords: Actinocyclus curvatulus; Actinocyclus ingens; Actinocyclus ochotensis; Actinocyclus octonarius; Actinocyclus octonarius var. tenellus; Actinocyclus oculatus; Actinocyclus subtilis; Actinoptychus senarius; Amphora proteus; Amphora sp.; Arachnoidiscus ehrenbergii; Aulacodiscus affinis; Aulacoseira praegranulata forma curvata; Aulacoseira praegranulata var. praeislandica; Azpeitia tabularis; Bacillaria socialis; Bacterosira bathyomphala; Bacterosira constricta; Caloneis brevis; Caloneis westii; Chaetoceros aff. coronatus; Chaetoceros debilis; Chaetoceros diadema; Chaetoceros didymus; Chaetoceros furcellatus; Chaetoceros holsaticus; Chaetoceros ingolfianus; Chaetoceros lorenzianus; Chaetoceros mitra; Chaetoceros radicans; Chaetoceros sp.; Chaetoceros spp.; Chaetoceros teres; Cocconeis costata; Cocconeis scutellum; Cocconeis vitrea; Coscinodiscus argus; Coscinodiscus asteromphalus; Coscinodiscus marginatus; Coscinodiscus obscurus; Coscinodiscus oculus-iridis; Coscinodiscus perforatus var. cellulosus; Coscinodiscus radiatus; Coscinodiscus radiatus var. borealis; Cosmiodiscus insignis; Cymbella spp.; Delphineis kippae; Delphineis surirella; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diploneis crabro; Diploneis didyma; Diploneis litoralis; Diploneis litoralis var. clathrata; Diploneis smithii; Diploneis spp.; Diploneis subcincta; Diploneis suborbicularis; Dytilum brightwelli; Elements, total; Encyonema silesiacum; Entomoneis gigantea var. septentrionalis; Epithemia adnata; Eunotia faba; Eunotia praerupta; Eunotia spp.; Eunotia suecica; Eunotia valida; Eupyxidicula arctica; Eupyxidicula horridus; Eupyxidicula nipponica; Eupyxidicula zabelinae; Fossula arctica; Fragilariopsis cylindrus; Fragilariopsis oceanica; Fragilariopsis reginae-jahniae; GC; Gomphonema sp.; Grammatophora angulosa; Grammatophora arctica; Grammatophora arcuata; Grammatophora hamulifera; Grammatophora oceanica; Gravity corer; Halamphora costata; Hantzschia amphioxys; Hyalodiscus obsoletus; Hyalodiscus scoticus; LV77-3-1; Lyrella david-mannii; Melosira arctica; Melosira moniliformis var. octogona; Navicula directa; Navicula kariana var. detersa; Navicula menisculus; Navicula peregrina; Navicula rhynchocephala; Navicula spp.; Navicula superba; Navicula superba var. elliptica; Navicula transitans; Navicula transitans var. assimetricus; Navicula valida; Neidium bisulcatum; Neodenticula kamtschatica; Neodenticula seminae; Nitzschia angularis; Nitzschia gelida; Nitzschia hudsonii; Nitzschia hybrida; Nitzschia laevissima; Nitzschia polaris; Nitzschia scabra; Nitzschia sp.; Odontella aurita; Opephora schwartzii; Paralia sulcata; Paraplaconeis subplacentula; Pauliella taeniata; Petroneis granulata; Pinnularia bihastata; Pinnularia brevicostata; Pinnularia lata; Pinnularia quadratarea var. constricta; Pinnularia quadratarea var. subglabra; Pinnularia spp.; Pinnularia viridis; Placoneis amphibola; Placoneis placentula; Plagiogramma staurophorum; Pleurosigma angulatum; Podosira dubia; Porosira glacialis; Porosira punctata; Proboscia alata; Proboscia barboi; Proboscia curvirostris; Proboscia subarctica; Pseudogomphonema arcticum; Pseudogomphonema kamtschaticum; Pseudogomphonema septentrionale; Pseudopyxilla dubia; Reimeria sinuata; Rhizosolenia hebetata; Rhizosolenia hebetata forma semispina; Rhizosolenia setigera; Rhizosolenia styliformis; Sellaphora bacillum; Shionodiscus biporus; Shionodiscus latimarginatus; Staurosirella pinnata; Stellarima microtrias; Surirella spp.; Thalassionema nitzschioides; Thalassionema robusta; Thalassiosira anguste-lineata; Thalassiosira antarctica; Thalassiosira baltica; Thalassiosira eccentrica; Thalassiosira hyalina; Thalassiosira hyperborea; Thalassiosira nordenskioeldii; Thalassiosira simonsenii; Thalassiosira spp.; Thalassiosira tertiaria; Thalassiothrix longissima; Trachyneis aspera
    Type: Dataset
    Format: text/tab-separated-values, 14268 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
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    Unknown
    Abundance of diatom cells in sediments from the Okhotsk and Bering Seas and the Northwest Pacific Ocean (2004)
    PANGAEA
    In:  Pacific Oceanology Institute, Far East Branch of Russian Academy of Sciences | Supplement to: Tsoy, Ira B; Obrezkova, Maria S; Artemova, Antonina V (2009): Diatoms in surface sediments of the Sea of Okhotsk and the Northwest Pacific Ocean. Oceanology, 49(1), 130-139, https://doi.org/10.1134/S0001437009010159
    Details
    Publication Date: 2024-06-25
    Description: The present investigation was targeted at diatom composition studies in the surface sediments (0-1 cm) sampled in the Sea of Okhotsk and the northwest Pacific in the depth range from 130 to 6110 m. The taxonomic analysis, as well as the quantitative (the diatom cell abundance per sediment dry weight unit) content and ecological group definition, was applied. Ten diatom taxa are the main body (80-100%) of the diatom assemblages: Bacterosira bathyomphala, Chaetoceros spp. (spores), Actinocyclus curvatulus, Thalassiosira latimarginata (group), T. antarctica (spores), Neodenticula seminae, Rhizosolenia hebetata f. hiemalis, Thalassiothrix longissima, Coscinodiscus marginatus, Coscinodiscus oculus iridis. The relative content of these species reflects the sedimentation conditions for different parts of the sea: the shelf, the continental slope, the open sea, and the ocean. The highest diatom content (45.6.3-60.0 mln per g of dry weight) was found for the surface sediments in the central part of the Sea of Okhotsk and the continental slope of western Kamchatka.
    Keywords: Akademik A. Vinogradov; Akademik A Nesmeyanov; Akademik M.A. Lavrentyev; AN_1992; AN_1993; AN21-2182; AN21-2221; AN25-936; Archive of Ocean Data; ARCOD; Area/locality; AVI19; AVI19-BC-27; AVI19-BC-8; AVI19-GC-11; AVI19-GC-24; AVI19-GC-36; AVI19-GC-5; AVI19-GC-6; AVI19-GC7; AVI19-GC-9; BC; Bering Sea; Box corer; Counting, diatoms; Depth, bottom/max; Depth, top/min; Diatoms; Elevation of event; Emperor Seamounts; Event label; GE99/KOMEX_VI; Ge99-32; Giant piston corer; GPC; IMAGES VII - WEPAMA; KOMEX I; Latitude of event; Longitude of event; LV28; LV28-2-2; LV28-34-1; LV28-40-3; LV28-41-3; LV28-42-3; LV28-4-3; LV28-43-3; LV28-44-2; LV28-61-3; LV28-64-3; Marion Dufresne (1995); Marshal Gelovany; MD012417; MD01-2417; MD122; MG34; MG34-89193; MG34-89203; MG34-89211; Morskoy Geophysik; MUC; MultiCorer; North Pacific; Sample type; Sea of Okhotsk
    Type: Dataset
    Format: text/tab-separated-values, 135 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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