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  • 1
    Online Resource
    Online Resource
    Palynology as a tool for land-sea correlation; an example from the eastern Mediterranean region
    Geological Society of London ; 1996
    In:  Geological Society, London, Special Publications Vol. 111, No. 1 ( 1996-01), p. 351-357
    Details
    In: Geological Society, London, Special Publications, Geological Society of London, Vol. 111, No. 1 ( 1996-01), p. 351-357
    Type of Medium: Online Resource
    ISSN: 0305-8719 , 2041-4927
    URL: Article
    DOI: 10.1144/GSL.SP.1996.111.01.23
    Language: English
    Publisher: Geological Society of London
    Publication Date: 1996
    detail.hit.zdb_id: 2478172-1
    detail.hit.zdb_id: 196249-8
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  • 2
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    Online Resource
    Late Quaternary palaeoenvironmental evolution and sea level oscillation of Santa Catarina Island (southern Brazil)
    Copernicus GmbH ; 2023
    In:  Biogeosciences Vol. 20, No. 10 ( 2023-05-23), p. 1843-1861
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 20, No. 10 ( 2023-05-23), p. 1843-1861
    Abstract: Abstract. Sea level oscillation during the Quaternary played a major role in the geomorphology and vegetation dynamics of coastal areas in southern Brazil, encompassing ecosystems that often have a unique biodiversity. Understanding the natural evolution of these areas is essential for decision making regarding land use regulations towards sustainable development, as well as to preserve the uniqueness of the coastal ecosystems. The southern Brazil coastal plain is formed by marine, transitional and continental Quaternary deposits controlled by past variations of the sea level. These variations shaped the coastal landscape and influenced the development of different Atlantic rainforest formations, such as mangroves and restingas. In particular, the restinga formation corresponds to a specific ecosystem that covers sandy soils of marine and fluvial–marine origin formed during the Quaternary on the Brazilian coastal plain. In this contribution, we present high-resolution palynological and stable isotope data from a Holocene core retrieved from the coastal plain of Santa Catarina Island (southern Brazil). We were able to identify four different environmental zones for the last 6520 yr BP. The first zone (6520–2920 cal yr BP) is characterized by a lagoon with large marine-water influence. Notably, the observed dinoflagellate cyst association suggests that marine waters entering the region had their origin in the relatively warm and saline Brazil Current waters. During the second zone (2920–1520 cal yr BP), marine-water contribution to the lagoon decreased until it became disconnected from the sea. The third zone (1520–550 cal yr BP) was marked by the decrease of the water level until it dried out and led to the colonization of herbaceous vegetation over the palaeo-lagoon. The last zone (550 cal yr BP–recent) is characterized by the consolidation of the coastal-plain Atlantic rainforest (restinga vegetation). Our results form an example of the strong sensitivity of southern Brazilian ecosystem change caused by relative sea level variations. As such, this study might contribute to the debate about the potential effects of current climate change induced by global sea level variations.
    Type of Medium: Online Resource
    ISSN: 1726-4189
    URL: Article
    DOI: 10.5194/bg-20-1843-2023
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2023
    detail.hit.zdb_id: 2158181-2
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  • 3
    Online Resource
    Online Resource
    Assessing environmental control on dinoflagellate cyst distribution in surface sediments of the Benguela upwelling region (eastern South Atlantic)
    Wiley ; 2007
    In:  Limnology and Oceanography Vol. 52, No. 6 ( 2007-11), p. 2582-2594
    Details
    In: Limnology and Oceanography, Wiley, Vol. 52, No. 6 ( 2007-11), p. 2582-2594
    Abstract: Organic‐walled dinoflagellate cyst assemblages in surface sediments of the Benguela Current Upwelling System (eastern South Atlantic) show geographic patterns that cannot entirely originate from cyst production or transport. Aimed at answering how far these variations are due to taphonomic control, this study investigated a possible correlation with the changes in bottom‐water oxygen concentrations typifying this region. Based on 36 samples, multivariate statistics were used to analyze community variability with respect to bottom‐water oxygen concentration, temperature, salinity, nutrient content, chlorophyll a (Chl a ) concentration, the organic carbon content of surface sediments, and a measure of water column stratification. Determined relationships to salinity, nutrient supply, nutrition, and environmental steadiness point out the requirements for dinoflagellate cyst production, while cross‐shelf transport processes could have introduced variability prior to burial of cysts in surface sediments. The offshore decrease in the relative abundance of protoperidinacean cyst types was consistent with their lower preservation potential under oxygenated conditions and coincided with a change in assemblage composition toward oxidation resistant species. On elimination of covariation, bottom‐water oxygenation was significantly related to this pattern and determined together with seasonal salinity, Chl a , and annual phosphate concentration, the parameter combination best explaining community variability. These results suggest that postdepositional degradation of peridinioid dinoflagellate cysts would partly explain the onshore‐offshore gradient in species distributions and could be responsible for more variability in assemblage compositions than is presently acknowledged.
    Type of Medium: Online Resource
    ISSN: 0024-3590 , 1939-5590
    URL: Article
    DOI: 10.4319/lo.2007.52.6.2582
    Language: English
    Publisher: Wiley
    Publication Date: 2007
    detail.hit.zdb_id: 2033191-5
    detail.hit.zdb_id: 412737-7
    SSG: 12
    SSG: 14
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  • 4
    Online Resource
    Online Resource
    Table_1.xlsx
    Frontiers Media SA ; 2022
    In:  Frontiers in Marine Science Vol. 9 ( 2022-7-26)
    Details
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 9 ( 2022-7-26)
    Abstract: To extend the understanding of dinoflagellate cysts production, excystment and vertical/lateral transport in the water column, we compared upper water cyst export production with cysts associations and concentrations in the subsurface nepheloid layer, bottom nepheloid layer and deeper water column during active upwelling off Cape Blanc (NW Africa) in August 2020. Export production was collected by two drifting trap surveys; DTS1 in an active upwelling cell for 4 days and DTS2 in an offshore drifting upwelling filament for 2 days. Subsurface, bottom nepheloid layers and deeper waters were sampled by in-situ pumps along two transects perpendicular to the shelf break. During DTS1, light limitation hampered phytoplankton production which might have influenced cyst production negatively due to up- and downward movement of water masses. Cyst export production increased at the rim of the upwelling cell. For DTS2, upwelling filament cyst export production was up to 3 times lower than that of DTS1. Echinidinium delicatum had highest relative and absolute abundances in the active upwelling, Echinidinium zonneveldiae and Bitectatodinium spongium in the upwelling filament, and Impagidinium spp. and cysts of Gymnodinium microreticulatum/nolleri at the most distal stations. Comparison of concentrations of cysts with and without cell contents showed that the majority of cysts hatched before reaching deeper waters and displayed a dormancy period of less than 6 days. About 5% of the living cysts reached deeper waters and/or the ocean floor. Living cysts were transported offshore in the upwelling filament. In case ships exchange ballast waters in the studied region, they will take up laterally transported living cysts. Upon release of the ballast waters in the port of arrival, these cysts have the potential to become “invader species” that can threaten economy and/or health. Lateral transport of cysts was observed in the bottom nepheloid layer and in deeper waters (800 - 1200m depth) with a maximal extension of about 130km off the shelf break. Therefore, sediments in the region will contain a mixture of regionally and locally produced dinoflagellate cysts. This insight contributes to the improvement of environmental reconstructions of the Cape blanc upwelling system based on downcore cyst associations.
    Type of Medium: Online Resource
    ISSN: 2296-7745
    URL: Article
    URL: Article
    DOI: 10.3389/fmars.2022.915755
    DOI: 10.3389/fmars.2022.915755.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2757748-X
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  • 5
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    Online Resource
    Micro-Fourier transform infrared spectroscopy of degradation-resistant organic microfossils; Influence of preservation environment and phylogeny
    Frontiers Media SA ; 2022
    In:  Frontiers in Marine Science Vol. 9 ( 2022-12-7)
    Details
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 9 ( 2022-12-7)
    Abstract: To gain more insight into the effect of early diagenetic processes in different redox environments on the molecular characteristics of degradation resistant particulate organic matter, the molecular cyst wall characteristics of the closely related dinoflagellates Impagidinium aculeatum and I. patulum from oxic and anoxic sedimentary environments in the Madeira Abyssal Plain F-turbidite and in the surface sediments of the eastern Mediterranean Sea have been analysed with micro-FTIR spectroscopy. Both species have cysts that are representatives of particulate organic matter being extremely resistant against degradation in natural environments. Their walls primarily consist of a carbohydrate-based polymer. Spectral differences could not be observed between cysts from oxic and anoxic environments, neither from different areas nor from different geological times. However, we identify consistent compositional differences between both species. Compared to I. patulum , cyst walls of I. aculeatum contain more C-O probably of secondary alcohols that might imply a slightly higher resistance to decay of I. patulum . Comparison with cyst species that represent particular organic matter being extremely sensitive and slightly resistant against aerobic degradation in natural settings reveals that cysts walls of the most vulnerable species show C=N, N-H, N-O, C-N bending/stretching, as well as the presence of C=O and C-O bounds. Cyst species that are somewhat less sensitive have a strong indication of the presence of nitrogen in their macromolecules. More resistant species lack nitrogen whereas the most resistant cyst species I. aculeatum and I. patulum show low amounts of C=O.
    Type of Medium: Online Resource
    ISSN: 2296-7745
    URL: Article
    DOI: 10.3389/fmars.2022.1040543
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2757748-X
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  • 6
    Online Resource
    Online Resource
    Different nutrient sources forcing increased productivity during eastern Mediterranean S1 sapropel formation as reflected by calcareous dinoflagellate cysts : CALCAREOUS DINOFLAGELLATE CYSTS IN S1
    American Geophysical Union (AGU) ; 2004
    In:  Paleoceanography Vol. 19, No. 1 ( 2004-03), p. n/a-n/a
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 19, No. 1 ( 2004-03), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0883-8305
    URL: Article
    DOI: 10.1029/2003PA000895
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2004
    detail.hit.zdb_id: 637876-6
    detail.hit.zdb_id: 2916554-4
    SSG: 16,13
    SSG: 13
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  • 7
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    Online Resource
    The cyst-motile stage relationships of Protoperidinium monospinum (Paulsen) Zonneveld et Dale comb. nov. and Gonyaulax verior (Dinophyta, Dinophyceae) from the Oslo Fjord (Norway)
    Informa UK Limited ; 1994
    In:  Phycologia Vol. 33, No. 5 ( 1994-09), p. 359-368
    Details
    In: Phycologia, Informa UK Limited, Vol. 33, No. 5 ( 1994-09), p. 359-368
    Type of Medium: Online Resource
    ISSN: 0031-8884 , 2330-2968
    URL: Article
    DOI: 10.2216/i0031-8884-33-5-359.1
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 1994
    detail.hit.zdb_id: 2243466-5
    detail.hit.zdb_id: 391102-0
    SSG: 12
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  • 8
    Online Resource
    Online Resource
    Calcareous cyst-producing dinoflagellates: ecology and aspects of cyst preservation in a highly productive oceanic region
    Geological Society of London ; 2002
    In:  Geological Society, London, Special Publications Vol. 195, No. 1 ( 2002-01), p. 317-340
    Details
    In: Geological Society, London, Special Publications, Geological Society of London, Vol. 195, No. 1 ( 2002-01), p. 317-340
    Type of Medium: Online Resource
    ISSN: 0305-8719 , 2041-4927
    URL: Article
    DOI: 10.1144/GSL.SP.2002.195.01.17
    Language: English
    Publisher: Geological Society of London
    Publication Date: 2002
    detail.hit.zdb_id: 2478172-1
    detail.hit.zdb_id: 196249-8
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  • 9
    Online Resource
    Online Resource
    Seasonal, annual, and inter-annual Spiniferites cyst production: a review of sediment trap studies
    Informa UK Limited ; 2018
    In:  Palynology Vol. 42, No. sup1 ( 2018-12-20), p. 162-181
    Details
    In: Palynology, Informa UK Limited, Vol. 42, No. sup1 ( 2018-12-20), p. 162-181
    Type of Medium: Online Resource
    ISSN: 0191-6122 , 1558-9188
    URL: Article
    DOI: 10.1080/01916122.2018.1465738
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2018
    detail.hit.zdb_id: 444851-0
    detail.hit.zdb_id: 2179197-1
    SSG: 13
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  • 10
    Online Resource
    Online Resource
    Differences in the chemical composition of organic‐walled dinoflagellate resting cysts from phototrophic and heterotrophic dinoflagellates
    Wiley ; 2014
    In:  Journal of Phycology Vol. 50, No. 2 ( 2014-04), p. 254-266
    Details
    In: Journal of Phycology, Wiley, Vol. 50, No. 2 ( 2014-04), p. 254-266
    Abstract: Dinoflagellates constitute a large proportion of the planktonic biomass from marine to freshwater environments. Some species produce a preservable organic‐walled resting cyst (dinocyst) during the sexual phase of their life cycle that is an important link between the organisms, the environment in which their parent motile theca grew, and the sedimentary record. Despite their abundance and widespread usage as proxy indicators for environmental conditions, there is a lack of knowledge regarding the dinocyst wall chemical composition. It is likely that numerous factors, including phylogeny and life strategy, determine the cyst wall chemistry. However, the extent to which this composition varies based on inherent (phylogenetic) or variable (ecological) factors has not been studied. To address this, we used micro‐ F ourier transform infrared spectroscopy to analyze nine cyst species produced by either phototrophic or heterotrophic dinoflagellates from the extant orders G onyaulacales, G ymnodiniales, and P eridiniales. Based on the presence of characteristic functional groups, two significantly different cyst wall compositions are observed that correspond to the dinoflagellate's nutritional strategy. The dinocyst wall compositions analyzed appeared carbohydrate‐based, but the cyst wall produced by phototrophic dinoflagellates suggested a cellulose‐like glucan, while heterotrophic forms produced a nitrogen‐rich glycan. This constitutes the first empirical evidence nutritional strategy is related to different dinocyst wall chemistries. Our results indicated phylogeny was less important for predicting composition than the nutritional strategy of the dinoflagellate, suggesting potential for cyst wall chemistry to infer past nutritional strategies of extinct taxa preserved in the sedimentary record.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2014.50.issue-2
    DOI: 10.1111/jpy.12170
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2014
    detail.hit.zdb_id: 281226-5
    detail.hit.zdb_id: 1478748-9
    SSG: 12
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