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Author Chapelle, G; Peck, LS
Title Polar gigantism dictated by oxygen availability Type Journal Article
Year 1999 Publication Nature Abbreviated Journal Nature
Volume 399 Issue Pages 114-115
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Publisher Place of Publication (up) Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0028-0836 ISBN Medium
Area Black Sea; Caspian Sea; Lake Baikal Expedition Conference
Notes Approved no
Call Number refbase @ user @ 137 Serial 1
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Author Schleser, GH; Jayasekera, R
Title δ13C-variations of leaves in forests as an indication of reassimilated CO2 from the soil Type Journal Article
Year 1985 Publication Oecologia Abbreviated Journal Oecologia
Volume 65 Issue Pages 536-542
Keywords soil respiration; photosynthesis; vascular plant
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ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number refbase @ user @ ms Serial 11
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Author Lohrmann, A; Cabrera, R; Kraus, NC
Title Acoustic-doppler velocimeter (ADV) for laboratory use Type Journal Article
Year 1994 Publication Fundamentals and advancements in hydraulic measurements and experimentation. Proceedings, Hydraulic Division/ASCE, August 1994 Abbreviated Journal
Volume Issue Pages 351-365
Keywords methods; flow; flume
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Publisher Place of Publication (up) Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN ISBN Medium
Area Expedition Conference Symposium on fundamentals and advancements in hydraulic measurements and experimentation
Notes Approved no
Call Number refbase @ user @ Serial 8
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Author Bischof, K; Peralta, G; Kräbs, G; van de Poll, WH; Perez-Llorens, JL; Breeman, AM
Title Effects of solar UV-B radiation on canopy structure of Ulva communities from southern Spain Type Journal Article
Year 2002 Publication Journal of Experimental Botany Abbreviated Journal J Exp Bot
Volume 53 Issue 379 Pages 2411-2421
Keywords canopy formation; photosynthesis; ultraviolet radiation; Ulva rotundata
Abstract Within the sheltered creeks of Cádiz bay, Ulva thalli form extended mat-like canopies. The effect of solar ultraviolet radiation on photosynthetic activity, the composition of photosynthetic and xanthophyll cycle pigments, and the amount of RubisCO, chaperonin 60 (CPN 60), and the induction of DNA damage in Ulva aff. rotundata Bliding from southern Spain was assessed in the field. Samples collected from the natural community were covered by screening filters, generating different radiation conditions. During daily cycles, individual thalli showed photoinhibitory effects of the natural solar radiation. This inhibition was even more pronounced in samples only exposed to photosynthetically active radiation (PAR). Strongly increased heat dissipation in these samples indicated the activity of regulatory mechanisms involved in dynamic photoinhibition. Adverse effects of UV-B radiation on photosynthesis were only observed in combination with high levels of PAR, indicating the synergistic effects of the two wavelength ranges. In samples exposed either to PAR+UV-A or to UV-B+UV-A without PAR, no inhibition of photosynthetic quantum yield was found in the course of the day. At the natural site, the top layer of the mat-like canopies is generally completely bleached. Artificially designed Ulva canopies exhibited fast bleaching of the top layer under the natural solar radiation conditions, while this was not observed in canopies either shielded from UV or from PAR. The bleached first layer of the canopies acts as a selective UV-B filter, and thus prevents subcanopy thalli from exposure to harmful radiation. This was confirmed by the differences in photosynthetic activity, pigment composition, and the concentration of RubisCO in thalli with different positions within the canopy. In addition, the induction of the stress protein CPN 60 under UV exposure and the low accumulation of DNA damage indicate the presence of physiological protection mechanisms against harmful UV-B. A mechanism of UV-B-induced inhibition of photosynthesis under field conditions is proposed.
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Publisher Oxford University Press Place of Publication (up) Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN ISBN Medium
Area southern Spain Expedition Conference
Notes Approved no
Call Number refbase @ user @ Serial 12
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Author Granskog, M.A.; Kaartokallio, H.; Thomas, D.; Ehn, J.; Kuosa, H.; Sonninen, E.
Title Horizontal variations in biogeochemical characteristics of landfast sea ice in the Gulf of Finland (the Baltic Sea) Type Book Chapter
Year 2004 Publication Abbreviated Journal
Volume Issue Pages 5-11
Keywords Fast Ice; Biogeochemical Properties; Salinity; Oxygen Isotope; Chlorophyll; Nutrients; Doc; Horizontal Patchiness; Spatial Variability; Patchiness; Baltic Sea; Oxygen Isotopes
Abstract In order to study the mesoscale variation in ice properties, horizontal variation of first-year landfast sea ice properties was investigated in the Gulf of Finland, the Baltic Sea. Several scales of variation were considered; samples at spacing of 0.2-, 2- and 20-m were sampled at several locations at different stages of the ice season. Spacing between these locations varied from hundreds of meters to kilometers. The variables measured included salinity, stable oxygen isotopes (δ¹8O), chlorophyll-a, nutrients, and dissolved organic carbon (DOC). Analyses of the data from the arrays did not show evidence of significant patchiness at scales <20-m. On scales of hundreds of meters to kilometers there was clear patchiness in several parameters (salinity, chl-a, snow depth and ice thickness). The results imply that the sampling effort in Baltic Sea ice studies should be concentrated at scales of hundreds of meters to kilometers.
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Publisher International Association of Hydraulic Engineering and Research Place of Publication (up) Editor 17th IAHR international symposium on ice, S.P., Russia, 21-25 June 2004,
Language Summary Language Original Title
Series Editor Series Title Proceedings of the 17th IAHR international symposium on ice, Saint Petersburg, Russia, 21-25 June 2004 Abbreviated Series Title
Series Volume 2 Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number refbase @ admin @ Granskog_etal2004 Serial 16
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