| |
Records |
Links |
|
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 |
|
| |
Abstract |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
English |
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
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 |
|
| Permanent link to this record |
| |
|
| |
|
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. |
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
Oxford University Press |
Place of Publication |
|
Editor |
|
|
| |
Language |
English |
Summary Language |
English |
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Area |
southern Spain |
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
no |
|
| |
Call Number |
refbase @ user @ |
Serial |
12 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Hobson, KA; Ambrose Jr, WG; Renaud, PE |
|
| |
Title |
Sources of primary production, benthic-pelagic coupling, and trophic relationships within the Northeast Water Polynya: Insights from δ13C and δ15N analysis |
Type |
Journal Article |
| |
Year |
1995 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
Mar Ecol Prog Ser |
|
| |
Volume |
128 |
Issue |
1-3 |
Pages |
1-10 |
|
| |
Keywords |
phytobenthos; polynyas; carbon 13; nitrogen isotopes; food webs; check lists; trophic structure; Algae; PNE, Greenland, Northeast Water Polynya |
|
| |
Abstract |
We used stable carbon (13C/12C) and nitrogen (15N/14N) isotope analysis to investigate linkages between sources of primary production and the pelagic and benthic components of the Northeast Water (NEW) Polynya off northeastern Greenland. Ice algae was enriched in 13C (mean δ13C = -18.6 vs -27.9 ppt) and 15N (mean δ15N = 8.3 vs 4.9 ppt) over particulate organic matter (POM) suggesting that the relative importance of these sources might be traced isotopically. Most grazing crustaceans and filter-feeding bivalves had δ13C and δ15N values in the range of -21 to -23 ppt and 7 to 9 ppt, respectively, indicating a direct pathway from POM. Close benthic-pelagic coupling was also confirmed for other benthic organisms examined with the exception of the predatory or deposit feeding echinoderms Ophiocten, Ophiacantha and Pontaster. Compared with other Arctic and temperate marine food webs, stable-carbon isotope values for the NEW Polynya were depleted in 13C. A δ15N trophic model that incorporated taxon-specific isotopic fractionation factors indicated that the NEW Polynya consisted of 4.5 to 5 trophic levels. Stable-isotope analysis may be well suited to establishing the importance of polynyas as sites of high primary productivity and tight benthic-pelagic coupling relative to regions of more permanent ice cover. |
|
| |
Address |
Canadian Wildlife Service, 115 Perimeter Road, Saskatoon, SK S7N 0X4, Canada |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
Inter-Research |
Place of Publication |
Oldendorf/Luhe |
Editor |
|
|
| |
Language |
English |
Summary Language |
English |
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0171-8630 |
ISBN |
|
Medium |
|
|
| |
Area |
Northeast Water Polynya; Northeast Greenland Shelf; Arctic |
Expedition |
|
Conference |
|
|
| |
Notes |
Bibliogr.: 63 ref. |
Approved |
no |
|
| |
Call Number |
refbase @ user @ 133 |
Serial |
3 |
|
| Permanent link to this record |
| |
|
| |
|
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 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
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 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Hilmer, M |
|
| |
Title |
A model study of Arctic sea ice variability |
Type |
Book Whole |
| |
Year |
2001 |
Publication |
|
Abbreviated Journal |
|
|
| |
Volume |
|
Issue |
|
Pages |
157 pp |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Doctoral thesis |
|
| |
Publisher |
Inst Meereskunde |
Place of Publication |
Kiel |
Editor |
|
|
| |
Language |
English |
Summary Language |
English; German |
Original Title |
|
|
| |
Series Editor |
|
Series Title |
Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel |
Abbreviated Series Title |
Ber Inst Meereskd Christian-Albrechts-Univ Kiel |
|
| |
Series Volume |
320 |
Series Issue |
|
Edition |
|
|
| |
ISSN |
0341-8561 |
ISBN |
|
Medium |
pp |
|
| |
Area |
Arctic Ocean |
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
refbase @ user @ 468 |
Serial |
2 |
|
| Permanent link to this record |
