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Eucampia antarctica

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Journal Article

Proxy development: a new facet of morphological diversity in the marine diatom Eucampia antarctica (Castracane) Mangin

Claire S. Allen
Published: 21 July 2014
Journal of Micropalaeontology (2014) 33 (2): 131–142.
DOI: https://doi.org/10.1144/jmpaleo2013-025
...Claire S. Allen Abstract The varied aspect ratios observed in the Antarctic marine diatom Eucampia antarctica are described and quantified. Data are compiled from detailed measurements of the gross morphology of winter stage specimens found in samples of modern marine sediments. Surface sediment...
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Late Pleistocene Eucampia antarctica abundance stratigraphy in the Atlantic sector of the Southern Ocean

Lloyd H. Burckle, D. W. Cooke
Published: 16 February 1983
Micropaleontology (1983) 29 (1): 6–10.
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Location maps. ( a ) Map of sample sites for Eucampia antarctica morphome...

Published: 21 July 2014
Fig. 2. Location maps. ( a ) Map of sample sites for Eucampia antarctica morphometric study. ( b ) Average summer sea surface temperatures (SST) for the Antarctic Peninsula region compiled from MODIS SST data. The seasonal climatology comprises daily averaged data for the months of mid-December
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Cumulative plots of valve volumes for each sample of Eucampia antarctica ....

Published: 21 July 2014
Fig. 6. Cumulative plots of valve volumes for each sample of Eucampia antarctica .
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Figure 1. A: Eucampia antarctica var. recta terminal valve (note pointe...

Published: 01 February 2005
Figure 1. A: Eucampia antarctica var. recta terminal valve (note pointed elevation of valve). B: Intercalary valve (note flattened elevations of valve). C, D: Colonial chain illustrations indicating position of terminal and intercalary valves. Straight colonial form is E. antarctica var
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Dendrograms presenting results of the agglomerative hierarchical clustering...

Published: 21 July 2014
Fig. 4. Dendrograms presenting results of the agglomerative hierarchical clustering analysis on ( a ) the ratio of symmetrical versus asymmetrical Eucampia antarctica valves; ( b ) the ratio of terminal versus intercalary Eucampia antarctica valves; ( c ) the basal widths of Eucampia
Journal Article

Minimal Antarctic sea ice during the Pliocene

J.M. Whitehead, S. Wotherspoon, S.M. Bohaty
Journal: Geology
Published: 01 February 2005
Geology (2005) 33 (2): 137–140.
DOI: https://doi.org/10.1130/G21013.1
...Figure 1. A: Eucampia antarctica var. recta terminal valve (note pointed elevation of valve). B: Intercalary valve (note flattened elevations of valve). C, D: Colonial chain illustrations indicating position of terminal and intercalary valves. Straight colonial form is E. antarctica var...
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Maps illustrating ( a ) diatom concentrations ( b ) relative abundance of ...

Published: 21 July 2014
Fig. 3. Maps illustrating ( a ) diatom concentrations ( b ) relative abundance of Eucampia antarctica in surface sediment samples from the Scotia Sea and Antarctic Peninsula; and the relative contributions of ( c ) asymmetrical/symmetrical and ( d ) terminal/ intercalary valves to the Eucampia
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Morphological structure and measurements. ( a ) Schematic drawing of colony...

Published: 21 July 2014
Fig. 1. Morphological structure and measurements. ( a ) Schematic drawing of colony structures of Eucampia antarctica indicating position of terminal and intercalary valves. The straight colonial form with symmetrical valves (left) is E. antarctica var. recta and the curved form comprised
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Scattergrams of the valve width and averaged height (aspect ratio) for each...

Published: 21 July 2014
Fig. 5. Scattergrams of the valve width and averaged height (aspect ratio) for each sample of Eucampia antarctica .
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SEM photographs of the A) 8–7.5 φ, B) 7.5–7 φ, C) 7–6.5 φ, D) 6.5–6...

Published: 01 August 2011
Figure 5 SEM photographs of the A) 8–7.5 φ, B) 7.5–7 φ, C) 7–6.5 φ, D) 6.5–6 φ, and E) 6–4 φ fractions of PC072 and F) a close-up of the diatom Eucampia antarctica . White circles mark individual terrigenous silt grains.
Journal Article

Editorial: Siliceous plankton biomineralization, biodiversity and evolution

Taniel Danelian, Claire S. Allen
Published: 10 September 2014
Journal of Micropalaeontology (2014) 33 (2): 109–110.
DOI: https://doi.org/10.1144/jmpaleo2014-018
... analysis to better assess the true endemism of the regional flora and confirm the environmental associations of the diatom species. Claire Allen ’s paper evaluates whether morphological traits (colony length, valve symmetry and aspect ratio) in the Antarctic marine diatom Eucampia antarctica offer...
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High-resolution Holocene climate record from Maxwell Bay, South Shetland Islands, Antarctica

K.T. Milliken, J.B. Anderson, J.S. Wellner, S.M. Bohaty, P.L. Manley
Journal: GSA Bulletin
Published: 01 November 2009
GSA Bulletin (2009) 121 (11-12): 1711–1725.
DOI: https://doi.org/10.1130/B26478.1
..., the sea-surface temperatures (SST) were increasing and sea-ice conditions were decreasing. The assemblages are dominated by Chaetoceros spp., Thalassiosira antarctica, Fragilariopsis kerguelensis, Fragilariopsis curta, Cocconeis spp., and Eucampia antarctica var. antarctica. Taxa of secondary...
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Assessing subglacial processes from diatom fragmentation patterns

Reed P. Scherer, Charlotte M. Sjunneskog, Neal R. Iverson, Thomas S. Hooyer
Journal: Geology
Published: 01 July 2004
Geology (2004) 32 (7): 557–560.
DOI: https://doi.org/10.1130/G20423.1
... recognition ( Scherer et al., 2004 ). The initial sample contained 62 × 10 6 whole diatom valves per gram of dried sediment (v/gds), including 64% pennate diatoms and 36% centric diatoms (discounting Chaetoceros ). The robust, nondiscoid centric diatom Eucampia antarctica constituted 4% of all diatoms...
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Particle Size Measurement of Diatoms with Inference of Their Properties: Comparison of Three Techniques

Robert S. Pugh, I. Nick McCave
Published: 01 August 2011
Journal of Sedimentary Research (2011) 81 (8): 600–610.
DOI: https://doi.org/10.2110/jsr.2011.43
...Figure 5 SEM photographs of the A) 8–7.5 φ, B) 7.5–7 φ, C) 7–6.5 φ, D) 6.5–6 φ, and E) 6–4 φ fractions of PC072 and F) a close-up of the diatom Eucampia antarctica . White circles mark individual terrigenous silt grains. ...
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Diatom identification in the face of changing species concepts and evidence of phenotypic plasticity

Eileen J. Cox
Published: 21 August 2014
Journal of Micropalaeontology (2014) 33 (2): 111–120.
DOI: https://doi.org/10.1144/jmpaleo2014-014
... in Proboscia Sundström 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...
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Early Holocene retreat of the George VI Ice Shelf, Antarctic Peninsula

M.J. Bentley, D.A. Hodgson, D.E. Sugden, S.J. Roberts, J.A. Smith, M.J. Leng, C. Bryant
Journal: Geology
Published: 01 March 2005
Geology (2005) 33 (3): 173–176.
DOI: https://doi.org/10.1130/G21203.1
... diatoms including benthic ( Cocconeis fasciolata ) 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...
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Journal Article

Bottom sediments and near-bottom currents in the Southwestern Atlantic

E.M. Emelyanov
Published: 01 July 2015
Russ. Geol. Geophys. (2015) 56 (7): 996–1015.
DOI: https://doi.org/10.1016/j.rgg.2015.06.003
.... 1 , 5 ). This flow in bottom sediments is marked not only by the presence of sand interbeds—contourites—but also by the occurrence of Antarctic diatom species ( Nitzschia kerguelensis , Eucampia antarctica , Coscinodiscus lentiginosus , and others) in the western Brazil Basin (at depths...
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Book Chapter

Mixed biosiliceous-terrigenous sedimentation under the Antarctic Circumpolar Current, Scotia Sea

Author(s)
Carol J. Pudsey, John A. Howe
Book: Deep-Water Contourite Systems: Modern Drifts and Ancient Series, Seismic and Sedimentary Characteristics
Series: Geological Society, London, Memoirs
Publisher: Geological Society of London
Published: 01 January 2002
DOI: 10.1144/GSL.MEM.2002.022.01.23
EISBN: 9781862393974
... to a peak of 10–25% of the total radiolarian fauna ( Fig. 6 ). Similarly, downcore variations in the abundance of the diatom Eucampia antarctica were used by Jordan & Pudsey (1992) to delineate glacial and interglacial stages in Scotia Sea cores. Barium stratigraphy and thorium dating Biogenic...
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Abstract
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Abstract Sediment supply to the Scotia Sea is controlled by the east-flowing Antarctic Circumpolar Current (ACC) with some Weddell Gyre influence in the south. Near-bottom flow is unsteady with frequent changes in flow direction and episodic benthic storms. Near the North Scotia Ridge, mounds of sediment up to 1 km thick have accumulated on lower Miocene ocean floor. The basins farther south contain up to 2 km of sediment which is flat-lying or draped rather than mounded. Sediment cores exhibit a biogenic-terrigenous cyclicity related to glacial-interglacial cycles. Grain-size data suggest that ACC flow was stronger during glacials than interglacials.