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  • 1
    Online Resource
    Online Resource
    Contribution palynostratigraphique (dinokystes, pollen et spores) à la connaissance de la mer de Champlain: coupe de Saint-Césaire, Québec
    Canadian Science Publishing ; 1989
    In:  Canadian Journal of Earth Sciences Vol. 26, No. 12 ( 1989-12-01), p. 2450-2464
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 26, No. 12 ( 1989-12-01), p. 2450-2464
    Abstract: High-resolution continental (pollen and spores) and marine (dinoflagellate cysts) microfloral records were obtained from a section consisting of about 0.5 m of glaciolacustrine and 2.5 m of Champlain Sea deposits at the Saint-Césaire site. The pollen and spore assemblages indicate the existence of a regional open vegetation of shrub tundra to forest tundra. Fluctuations in the percentages of Picea and shrub and herb taxa are related to regional afforestation and paleogeographical evolution of the basin. The Champlain Sea sediments contain an abundant dinocyst flora dominated by Operculodinium centrocarpum, Brigantedinium spp., and Algidasphaeridium? minutum, which indicate cold Arctic conditions in surface waters. Fluctuations in concentration (10 2 –10 4 ∙cm −3 ) and relative abundance of dinocyst species are attributed to changes in dinoflagellate productivity and paleoceanographic conditions, notably paleosalinity. Morphological variations of Operculodinium centrocarpum and Algidasphaeridium? minutum led to this description of the varieties, named "cezare" after the site location.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e89-209
    Language: French
    Publisher: Canadian Science Publishing
    Publication Date: 1989
    detail.hit.zdb_id: 417294-2
    detail.hit.zdb_id: 1491201-6
    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Postglacial paleoceanography of Hudson Bay: stratigraphic, microfaunal, and palynological evidence
    Canadian Science Publishing ; 1990
    In:  Canadian Journal of Earth Sciences Vol. 27, No. 7 ( 1990-07-01), p. 946-963
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 27, No. 7 ( 1990-07-01), p. 946-963
    Abstract: Cores containing representative sequences of postglacial sediments in northern and southern Hudson Bay were analyzed for their microfaunal (foraminifers and ostracods) and palynological (dinocysts, pollen, and spores) content in order to reconstruct the evolution of environments since the last glaciation.In southern Hudson Bay, the marine invasion of the Tyrrell Sea at ca. 8000 BP, following the Lake Ojibway episode, was accompanied by the development of an Arctic-type microflora and microfauna indicative of a dense seasonal sea-ice cover and stratified water masses. Shortly after 8000 BP, the establishment of subarctic conditions in surface waters was accompanied by more intense homogenization of water masses. Subarctic conditions have persisted throughout most of the postglacial interval despite a recent surface-water cooling.In northern Hudson Bay, micropaleontological and lithological data reveal a succession of proximal to distal glaciomarine environments characterized by low biogenic productivity, harsh Arctic conditions, and stratified water masses. An increase in dinocyst abundance and diversity, after 6000 BP, indicates the establishment of cool subarctic conditions in surface waters, while foraminifer assemblages suggest intensified mixing of water masses.The micropaleontological records of northern and southern Hudson Bay reveal a strong latitudinal gradient in biogenic productivity and water mass characteristics throughout the postglacial interval. "Interglacial" conditions, established in southern Hudson Bay very shortly after it was invaded by the sea, seem to have occurred much later in northern Hudson Bay.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e90-098
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1990
    detail.hit.zdb_id: 417294-2
    detail.hit.zdb_id: 1491201-6
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  • 3
    Online Resource
    Online Resource
    Palynomorph distribution in Recent sediments from the Labrador Sea
    Canadian Science Publishing ; 1994
    In:  Canadian Journal of Earth Sciences Vol. 31, No. 1 ( 1994-01-01), p. 115-127
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 31, No. 1 ( 1994-01-01), p. 115-127
    Abstract: Surface sediments from the Labrador Sea and Baffin Bay have been examined for their palynomorph content. Pollen and spore assemblages reflect the vegetation zones of eastern Canada, although long-distance atmospheric transport results in over-representation of Pinus and spores. A linear decrease of pollen input is observed with distance from the source vegetation; the abyssal domain receives less than 2% of the initial input. The abundance of dinoflagellate cysts reflects a relatively high primary productivity in surface water masses which seems proportional to the benthic productivity, as shown by the concentrations of organic linings of foraminifers. The relative abundance of dinoflagellate cyst taxa and principal component analysis led to the definition of three assemblages that can be related to sea-surface conditions and current pattern. The modern distribution of dinoflagellate cysts was used to interpret assemblages recovered in five box cores from the deep Labrador Sea. Results reveal important changes in sea-surface conditions during the Holocene. At the end of the last glacial period, the productivity in surface waters was sparse, notably on the continental slope off southwest Greenland. Shortly after the deglaciation, the primary productivity increased, probably due to the improvement of sea-surface conditions. At about 5000 BP, the dinoflagellate cyst concentrations and fluxes reach maximum values, and the assemblages are marked by the augmentation of Nematosphaeropsis labyrinthus relative to Operculodinium centrocarpum. This trend is associated with a cooling and the increased influence of the inner component of the Greenland Current in surface water masses of the Labrador Sea. It marks the establishment of modern conditions in the basin.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e94-010
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 417294-2
    detail.hit.zdb_id: 1491201-6
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  • 4
    Online Resource
    Online Resource
    The Labrador Sea during the late Quaternary: Introduction
    Canadian Science Publishing ; 1994
    In:  Canadian Journal of Earth Sciences Vol. 31, No. 1 ( 1994-01-01), p. 1-4
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 31, No. 1 ( 1994-01-01), p. 1-4
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e94-001
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 417294-2
    detail.hit.zdb_id: 1491201-6
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  • 5
    Online Resource
    Online Resource
    Sea-surface conditions in northernmost Baffin Bay during the Holocene: palynological evidence
    Wiley ; 2001
    In:  Journal of Quaternary Science Vol. 16, No. 4 ( 2001-05), p. 353-363
    Details
    In: Journal of Quaternary Science, Wiley, Vol. 16, No. 4 ( 2001-05), p. 353-363
    Type of Medium: Online Resource
    ISSN: 0267-8179 , 1099-1417
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.1002/jqs.v16:4
    DOI: 10.1002/(ISSN)1099-1417
    DOI: 10.1002/jqs.614
    Language: English
    Publisher: Wiley
    Publication Date: 2001
    detail.hit.zdb_id: 2031875-3
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    SSG: 14
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  • 6
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    Online Resource
    Application of artificial neural networks (ANN) to high‐latitude dinocyst assemblages for the reconstruction of past sea‐surface conditions in Arctic and sub‐Arctic seas
    Wiley ; 2001
    In:  Journal of Quaternary Science Vol. 16, No. 7 ( 2001-10), p. 699-709
    Details
    In: Journal of Quaternary Science, Wiley, Vol. 16, No. 7 ( 2001-10), p. 699-709
    Abstract: The artificial neural network (ANN) method was applied to dinoflagellate cyst (dinocyst) assemblages to estimate palaeoceanographical conditions. The ANN method was adapted to three distinct data bases covering the northern North Atlantic ( N = 371), plus the Arctic seas ( N = 540) and the Bering Sea ( N = 646). The relative abundance of 23 dinocyst taxa was calibrated against hydrographic variables (sea‐surface temperature, salinity and density in February and August, and seasonal extent of sea‐ice cover) using ANNs. The estimation of hydrographical parameters based on an ANN yields high coefficients of correlation between observations and reconstructions for each variable selected. The validation tests performed on the different data bases suggest more accurate calibration at the scale of the North Atlantic and Arctic ( N = 540) than on a multibasin scale, i.e. when including the subpolar North Pacific ( N = 646). The ANN calibrations and the modern analogue technique (MAT) have been applied to two sequences from the northwest North Atlantic spanning the past 25 000 yr for the purpose of comparison. Both approaches yielded similar results, generally within the range of their respective uncertainties, demonstrating their suitability. The main discrepancies generally correspond to assemblages with poor modern analogues for which we have to admit a higher degree of uncertainties in the reconstruction, whatever the approach used. Copyright © 2001 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 0267-8179 , 1099-1417
    URL: Issue
    URL: Article
    DOI: 10.1002/jqs.v16:7
    DOI: 10.1002/jqs.651
    Language: English
    Publisher: Wiley
    Publication Date: 2001
    detail.hit.zdb_id: 2031875-3
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  • 7
    Online Resource
    Online Resource
    Marine dinoflagellate cysts and high latitude Quaternary paleoenvironmental reconstructions: an introduction
    Wiley ; 2001
    In:  Journal of Quaternary Science Vol. 16, No. 7 ( 2001-10), p. 595-602
    Details
    In: Journal of Quaternary Science, Wiley, Vol. 16, No. 7 ( 2001-10), p. 595-602
    Type of Medium: Online Resource
    ISSN: 0267-8179 , 1099-1417
    URL: Issue
    URL: Article
    DOI: 10.1002/jqs.v16:7
    DOI: 10.1002/jqs.660
    Language: English
    Publisher: Wiley
    Publication Date: 2001
    detail.hit.zdb_id: 2031875-3
    SSG: 13
    SSG: 14
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  • 8
    Online Resource
    Online Resource
    Reconstruction of sea-surface temperature, salinity, and sea-ice cover in the northern North Atlantic during the last glacial maximum based on dinocyst assemblages
    Canadian Science Publishing ; 2000
    In:  Canadian Journal of Earth Sciences Vol. 37, No. 5 ( 2000-05-01), p. 725-750
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 37, No. 5 ( 2000-05-01), p. 725-750
    Abstract: Past sea-surface conditions over the northern North Atlantic during the last glacial maximum were examined from the study of 61 deep-sea cores. The last glacial maximum time slice studied here corresponds to an interval between Heinrich layers H 2 and H 1 , and spanning about 20-16 ka on a 14 C time scale. Transfer functions based on dinocyst assemblages were used to reconstruct sea-surface temperature, salinity, and sea-ice cover. The results illustrate extensive sea-ice cover along the eastern Canadian margins and sea-ice spreading, only during winter, over most of the northern North Atlantic. On the whole, much colder winter prevailed, despite relatively mild conditions in August (10-15°C at most offshore sites), thus suggesting a larger seasonal contrast of temperatures than today. Lower salinity than at present is reconstructed, especially along the eastern Canadian and Scandinavian margins, likely because of meltwater supply from the surrounding ice sheets. These reconstructions contrast with those established by CLIMAP on the basis of planktonic foraminifera. These differences are discussed with reference to the stratigraphical frame of the last glacial maximum, which was not the coldest phase of the last glacial stage. The respective significance of dinocyst and foraminifer records is also examined in terms of the thermohaline characteristics of surface waters and the vertical structure of upper water masses, which was apparently much more stratified than at present in the northern North Atlantic, thus preventing deep-water formation.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e99-091
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2000
    detail.hit.zdb_id: 417294-2
    detail.hit.zdb_id: 1491201-6
    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    Middle Pleistocene to Holocene palynostratigraphy of Ocean Drilling Program Site 887 in the Gulf of Alaska, northeastern North Pacific
    Canadian Science Publishing ; 2001
    In:  Canadian Journal of Earth Sciences Vol. 38, No. 3 ( 2001-03-01), p. 373-386
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 38, No. 3 ( 2001-03-01), p. 373-386
    Abstract: A palynological investigation was undertaken on the upper 29 m of sediment at Ocean Drilling Program (ODP) Site 887, spanning the last 430 000 years (i.e., isotopic stages 12 to 1). Pollen and dinocyst assemblages reveal a major ecostratigraphical boundary at the MiddleLate Pleistocene transition. The Middle Pleistocene pollen data document the occurrence of a spruce forest vegetation in the source area, likely located on the adjacent Alaskan coast, whereas the Late Pleistocene is marked by higher inputs of pine, shrub, and herb taxa, suggesting predominant inputs from a more open landscape. The Middle Pleistocene is characterized by a low diversity in dinocyst assemblages, which are dominated by Operculodinium centrocarpum, whereas the Late Pleistocene is marked by the significant occurrence of Pentapharsodinium dalei, Pyxidinopsis reticulata, and by high percentages of Brigantedinium spp. Such assemblages suggest open oceanic and cool temperate conditions during the Middle Pleistocene, changing toward generally colder and less saline conditions during the Late Pleistocene. In addition, large fluctuations in the dinocyst assemblages during the Late Pleistocene are recorded in phase with the main shifts in the isotopic stratigraphy. A new dinocyst taxon, Spiniferites alaskensis sp. nov., exclusively recorded in sediments of the isotopic substage 5e, is described herein.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e00-092
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2001
    detail.hit.zdb_id: 417294-2
    detail.hit.zdb_id: 1491201-6
    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Holocene variations of sea‐surface conditions in the southeastern Barents Sea, reconstructed from dinoflagellate cyst assemblages
    Wiley ; 2001
    In:  Journal of Quaternary Science Vol. 16, No. 7 ( 2001-10), p. 717-726
    Details
    In: Journal of Quaternary Science, Wiley, Vol. 16, No. 7 ( 2001-10), p. 717-726
    Abstract: Palynomorphs were analysed in two sediment cores from the southeastern Barents Sea representing the past 8.3 and 4.4 kyr. High dinocyst contents and species diversity enabled the application of the best analogue method to quantitatively reconstruct sea‐surface salinities, temperatures and ice cover using 677 modern reference sites from the North Atlantic and Arctic seas, including new data from the Barents Sea reported here. At the southern core site, where waters are affected by the Atlantic inflow, sea‐surface conditions were relatively warm and stable between ca. 8000 and 5000 calendar yr BP. In contrast, the past 5 kyr had periods with cooler temperatures and extended ice cover, fluctuating mostly at 1–1.5 kyr frequencies at both sites. Most pronounced coolings occurred around 8.1, 5, 3.5–3.2 and 2.5 ka. The northern site additionally shows younger cooling events, tentatively dated to 1.4, 0.3 and 0.1 ka. Identified variations in sea‐surface conditions indicate changes in Atlantic water inputs to the Barents Sea. Our results generally correlate to palaeoclimatic reconstructions from northwestern Eurasia, exemplified by palynological records from Karelia. This correlation suggests that sea‐surface variations in the Barents Sea reflect large‐scale changes in atmospheric and oceanic interactions between the North Atlantic and the Arctic. Copyright © 2001 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 0267-8179 , 1099-1417
    URL: Issue
    URL: Article
    DOI: 10.1002/jqs.v16:7
    DOI: 10.1002/jqs.650
    Language: English
    Publisher: Wiley
    Publication Date: 2001
    detail.hit.zdb_id: 2031875-3
    SSG: 13
    SSG: 14
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