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Author |
Thomas, D.N.; Papadimitriou, S. |
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Title |
Biogeochemistry of sea ice |
Type |
Book Chapter |
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Year |
2003 |
Publication |
Sea ice – an introduction to its physics, chemistry, biology and geology |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
267-302 |
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Publisher |
Blackwell Science Ltd |
Place of Publication |
Oxford |
Editor |
Thomas, D.N.; Dieckmann, G.S. |
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ISBN |
0-632-05808-0 |
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no |
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Call Number |
refbase @ admin @ Thomas+Papadimitriou2003 |
Serial |
766 |
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Author |
Weykam, G.; Thomas, D.N.; Wiencke, C. |
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Title |
Growth and photosynthesis of the Antarctic red algae Palmaria decipiens (Palmariales) and Iridaea cordata (Gigartinales) during and following extended periods of darkness |
Type |
Journal Article |
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Year |
1997 |
Publication |
Phycologia |
Abbreviated Journal |
Phycologia |
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Volume |
36 |
Issue |
5 |
Pages |
395-405 |
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Keywords |
Winter; Polar waters; Photosynthesis; Antarctic zone; Ice cover; Seaweeds; Light effects; Plant physiology; Growth; Palmariales; Gigartinales; Iridaea cordata; Palmaria decipiens; Ps; Antarctica |
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Abstract |
Physiological and developmental responses during and following long-term exposure to darkness were investigated in the Antarctic red algae Palmaria decipiens and Iridaea cordata. Thalli were kept in darkness for a period of 6 mo, simulating winter sea ice cover. Subsequently, they were grown illuminated under seasonally fluctuating Antarctic daylengths. During darkness, P. decipiens, an Antarctic endemic, rapidly lost its ability to photosynthesize although chlorophyll a content remained fairly constant. The amount of floridean starch decreased gradually in the dark, with a sudden drop simultaneous with the development of new blades. After reexposure to light there was a rapid increase in photosynthetic oxygen production, whereas the rate of carbon assimilation increased more slowly, resulting in high apparent photosynthetic quotients. The increase in growth rate showed a close relation to carbon assimilation, suggesting that carbon is utilized first for growth, then for floridean starch accumulation. In contrast to P. decipiens, the photosynthetic rate of the Antarctic cold-temperate I. cordata was still about half of the initial rate after a dark period of 6 mo, i.e. the alga maintained functionality of its photosynthetic apparatus during winter. After reexposure to light there was a continuous increase in specific growth rate due to increasing photosynthetic activity. Iridaea cordata also accumulated floridean starch during summer, although in smaller amounts than P. decipiens. Together with the ability to photosynthesize, starch accumulation facilitates survival during extended dark periods in winter. The early development of blade initials and the rapid increase in photosynthetic capability after illumination may permit P. decipiens to use the period of high water transparency optimally in Antarctic spring. Iridaea cordata seems better able to survive prolonged dark periods in areas with less predictable light conditions. Both physiological patterns are well suited to the highly seasonal light conditions in Antarctica. |
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0031-8884 |
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Notes |
Marine |
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no |
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Call Number |
refbase @ admin @ Weykam++1997 |
Serial |
767 |
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Author |
Thomas, D.N.; Dieckmann, G.S. (eds) |
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Title |
Sea ice – an introduction to its physics, chemistry, biology and geology |
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Book Whole |
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Year |
2003 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
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Pages |
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Keywords |
zoology; sea ice |
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Abstract |
Sea ice, which covers up to 7% of the planets surface, is a major component of the worlds oceans, partly driving ocean circulation and global climate patterns... |
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Publisher |
Blackwell Science Ltd |
Place of Publication |
Oxford |
Editor |
Thomas, D.N.; Dieckmann, G.S. |
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ISBN |
0-632-05808-0 |
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no |
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Call Number |
refbase @ user @ Thomas+Dieckmann2003 |
Serial |
845 |
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Author |
Thomas, D.N.; Dieckmann, G.S. (eds) |
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Title |
Sea ice – an introduction to its physics, chemistry, biology and geology |
Type |
Book Whole |
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Year |
2003 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
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Pages |
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Keywords |
zoology; sea ice |
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Abstract |
Sea ice, which covers up to 7% of the planets surface, is a major component of the worlds oceans, partly driving ocean circulation and global climate patterns... |
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Corporate Author |
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Publisher |
Blackwell Science Ltd |
Place of Publication |
Oxford |
Editor |
Thomas, D.N.; Dieckmann, G.S. |
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Language |
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Summary Language |
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Original Title |
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Series Editor |
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Abbreviated Series Title |
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ISSN |
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ISBN |
0-632-05808-0 |
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no |
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Call Number |
refbase @ user @ Thomas+Dieckmann2003 |
Serial |
849 |
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Author |
Krell, A.; Ummenhofer, C.; Kattner, G.; Naumov, A.; Evans, D.; Dieckmann, G.S.; Thomas, D.N. |
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Title |
The biology and chemistry of land fast ice in the White Sea, Russia – A comparison of winter and spring conditions |
Type |
Miscellaneous |
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Year |
2003 |
Publication |
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Abstract |
Various abiotic and biotic parameters, including phytoplankton distribution, were studied to investigate seasonal changes within the fast-ice cover in Chupa Inlet, a freshwater-influenced Arctic-like fjord in Kandalaksha Bay (White Sea). Sea ice and under-ice water were collected along transects in the inlet in February and April 2002. Ice-texture analysis, salinity and δ18O values indicated that the complete ice sheet had transformed within 2 months. This resulted from an upward growth of snow ice and subsequent melting at the underside of the ice, which makes a comparison between the two sampling periods difficult in terms of defining temporal developments within the ice. Nutrients, DOC and DON concentrations in the under-ice water were typical for Russian Arctic rivers. Concentrations of nitrate, silicate and DOC in the ice were lower, which is attributed to a loss as the ice forms. The concentrations were also modified by biological activity. In February, there was a strong correspondence between the distribution of biological parameters, including particulate and dissolved organic carbon and nitrogen (POC and PON, DOC and DON) and inorganic nutrients (nitrate, nitrite, phosphate and silicate), which was not the case in April. The correlation between both DOC and DON with ammonium indicates heterotrophic activity within the winter ice collected in February. Sea-ice organisms were distributed throughout the ice, and several assemblages were found in surface layers of the ice. In April, a more typical distribution of biomass in the ice was measured, with low values in the upper part and high algal concentrations in the lower sections of the ice, characteristic of a spring ice-algal bloom. In contrast to the February sampling, there was evidence that the ice-algal assemblage in April was nitrogen-limited, with total inorganic nitrogen concentrations being |
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Call Number |
refbase @ admin @ Krell++2003 |
Serial |
15285 |
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