...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...

... 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...

... 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...

.... For simplicity we distinguish only pennates, centrics, and Eucampia . In general, pennates and centrics break roughly equivalently with compaction, a type of stress analogous to stratigraphic or glacial load, whereas pennates are especially vulnerable to breakage during shearing. This effect may be in part due...

...Figure 6. Estimation of qualitative diatom abundance (F—fair, C—common, A—abundant), preservation (P—poor, M—moderate, G—good), and Eucampia sp. ratio (BX—background, R—rare, F—fair, C—common, S/A—symmetrical/asymmetrical morphology). In general, diatom abundance and preservation are consistently...

... light, less heavily silicified diatoms, leaving a lag of Eucampia balaustium in well-sorted, sandy sediment. Warm-water, open-marine conditions initially prevailed after deglaciation on the northern part of the continental shelf during summers. Open-marine conditions were gradually replaced by the pack...

...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. ...

... 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...