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Thalassiosira antarctica

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Journal Article
Journal: Geology
Published: 01 May 2007
Geology (2007) 35 (5): 419-422.
... of their precursors, i.e., 24-norsterols, were unclear. We have unambiguously identified relatively high concentrations of 24- norcholesta-5,22-dien-3β-ol in the diatom Thalassiosira aff. antarctica (6%–10% of total sterols) and, in much lower concentrations, in the dinoflagellate Gymnodinium simplex (0.2% of total...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 December 1996
GSA Bulletin (1996) 108 (12): 1626-1644.
... and/or Rhizosolenia spp. also are found, as is a higher ratio of the most common species of Fragilariopsis versus species of Thalassiosira . These assemblages are indicative of periods of high primary productivity driven by the presence of a meltwater stabilized water column. The 200 yr cyclicity noted in other...
Journal Article
Published: 21 July 2014
Journal of Micropalaeontology (2014) 33 (2): 131-142.
... for Thalassiosira antarctica Comber and Chaetoceros Ehrenberg subgenus Hyalochaete Gran ( Peters & Thomas, 1996 ; Ishii et al . 2011 ) whilst in other species, temperature, salinity, nutrient availability and light intensity may be the principal controls over different growth forms. The warm- and cold...
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Journal Article
Journal: Geology
Published: 01 February 2003
Geology (2003) 31 (2): 127-130.
... returned seaward of the site closer to its present location. Figure 3. Distribution of relative abundance of Fragilariopsis curta (dashed line), and Thalassiosira antarctica (solid line) throughout units 1–3 of AM02 core. AM01 values are marked with circles, and ice-shelf front values are marked...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 November 2009
GSA Bulletin (2009) 121 (11-12): 1711-1725.
... was obtained from the Landsat image mosaic of Antarctica ( www.usgs.lima.gov ). White space in Figure 1C denotes areas that have not been mapped with multibeam data. The South Shetland Islands are composed of a series of islands with intervening fjords ( John and Sugden, 1971 ; Figs. 1A and 1B...
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Journal Article
Journal: Palynology
Published: 01 January 2006
Palynology (2006) 30 (1): 151-182.
... species recovered were Fragilariopsis barronii , Fragilariopsis curta, Rouxia antarctica, Thalassiosira elliptipora , Thalassiosira inura, Thalassiosira oestrupii and Thalassiosira vulnifica (Table 2 ). Although the piston cores covered a limited time interval (maximum length of 5 m...
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Journal Article
Published: 01 September 2002
Geological Magazine (2002) 139 (5): 577-594.
...H. A. JONKERS; J. M. LIRIO; R. A. DEL VALLE; S. P. KELLEY Abstract Knowledge of the late Miocene–Pliocene climate of West Antarctica, recorded by sedimentary units within the James Ross Island Volcanic Group, is still fragmentary. Late Miocene glaciomarine deposits at the base of the group...
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Journal Article
Published: 01 September 1998
Journal of the Geological Society (1998) 155 (5): 737-740.
... of the continent and displaced to their present elevations by glacier ice, after a period during which the ice cover of East Antarctica was markedly reduced and marine conditions were more widespread (Webb et al. 1984, 1996). The last phase of such conditions is dated by the presence of Thalassiosira insignis, T...
Journal Article
Published: 01 February 2008
Mineralogical Magazine (2008) 72 (1): 345-348.
...R. Raiswell; L. G. Benning; L. Davidson; M. Tranter Abstract Ice-hosted sediments in glaciers and icebergs from Antarctica and Svalbard contain authigenic nanoparticulates of schwertmannite, ferrihydrite and goethite that formed during sulphide oxidation. These phases indicate the existence...
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Journal Article
Journal: Geology
Published: 01 April 2006
Geology (2006) 34 (4): 301-304.
... was significantly reduced. A review of the available stratigraphy from Deep Sea Drilling Project–ODP drilling, and correlation with available seismic stratigraphic information, allowed us to recognize comparable changes in terms of age and trends in continental margin evolution in several places around Antarctica...
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Journal Article
Journal: Geology
Published: 01 February 2005
Geology (2005) 33 (2): 137-140.
... Eucampia antarctica with intercalary valves ( Eucampia index). This sea-ice proxy was calibrated by using modern diatom data obtained from core-top samples and winter sea-ice concentration data (September average through 1979–1987). The modern relationship is expressed as a binomial generalized linear...
FIGURES
Image
Figure 3. Distribution of relative abundance of  Fragilariopsis curta  (das...
in > Geology
Published: 01 February 2003
Figure 3. Distribution of relative abundance of Fragilariopsis curta (dashed line), and Thalassiosira antarctica (solid line) throughout units 1–3 of AM02 core. AM01 values are marked with circles, and ice-shelf front values are marked with triangles. Solid markers represent T. Antarctica
Journal Article
Journal: Geology
Published: 01 March 2005
Geology (2005) 33 (3): 173-176.
... ) and planktonic or sea-ice species ( Eucampia antarctica , Thalassiosira antarctica ) indicating (seasonally) open-marine conditions ( Cremer et al., 2003 ). Planktonic diatoms and sea-ice diatoms (especially Fragilariopsis curta ) dominate the lower part of zone 4. At ∼272 cm (in ML) and ∼152 cm (in MLNB...
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Journal Article
Published: 01 February 2012
Journal of Micropalaeontology (2012) 31 (1): 95-96.
... as a Supervisory Research Geologist within the Volcano Science Center. Notably, he is the Survey’s internationally recognized expert on the climate of the past 15 000 years in the North Pacific area and on the climatic and glacial history of Antarctica during the past 65 million years. In 1984, John was elected...
Journal Article
Journal: PALAIOS
Published: 01 May 2013
PALAIOS (2013) 28 (5): 267-269.
...LEE F. STANISH; JOHN R. SPEAR * Corresponding author. SEPM (Society for Sedimentary Geology) 2013 Streams in the McMurdo Dry Valleys of Antarctica (MDV) are harsh habitats for life. Months of perpetual darkness and subzero temperatures are punctuated by months of perpetual sunlight...
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Journal Article
Journal: Geology
Published: 01 November 2013
Geology (2013) 41 (11): 1199-1200.
... performance of the diatoms Chaetoceros gracilis and Thalassiosira weissflogii when exposed to UVR : Journal of Photochemistry and Photobiology. B, Biology , v. 101 , p. 196 – 205 , doi:10.1016/j.jphotobiol.2010.07.003 . Harper M.A. McKay R.M. , 2010 , Diatoms as markers of atmospheric...
Journal Article
Journal: Geology
Published: 01 July 2004
Geology (2004) 32 (7): 557-560.
...), including 64% pennate diatoms and 36% centric diatoms (discounting Chaetoceros ). The robust, nondiscoid centric diatom Eucampia antarctica constituted 4% of all diatoms. Pennates in the initial sample included a wide variety of forms, from long, slender taxa, such as Fragilariopsis obliquicostata...
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Journal Article
Published: 21 August 2014
Journal of Micropalaeontology (2014) 33 (2): 111-120.
... and Eucampia antarctica (Castracane) Mangin indicates that different morphologies correlate with seasons ( Fryxell, 1991 , 1994 ; Jordan et al ., 1991 ), while Chaetoceros dichaeta Ehrenberg produces cells with shorter setae in sea ice than in the plankton, and the setae are bent inside the filament...
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Journal Article
Journal: Geology
Published: 01 September 2003
Geology (2003) 31 (9): 749-752.
... to recent break-up events ( Scambos et al., 2001 ). Melting and calving of ice shelves on both sides of the Antarctica Peninsula have long raised concerns about the future ice-mass flux of the continental tributary glaciers that feed into the ice shelves ( Mercer, 1978 ). Sediment cores recovered from...
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Journal Article
Journal: Elements
Published: 01 December 2018
Elements (2018) 14 (6): 397-402.
... composition from the WAIS Divide ice core, Antarctica, an indicator of temperature. F rom B uizert et al . (2015) . All data are plotted on the age scale provided with the original publication. However, there are still many open questions surrounding the actual process of how seawater acquires its Nd...
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