Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Controls on the molecular distribution and carbon isotopic composition of alkenones in certain haptophyte algae
Autore:
Laws, EA; Popp, BN; Bidigare, RR; Riebesell, U; Burkhardt, S;
Indirizzi:
Univ Hawaii, Sch Ocean & Earth Sci & Technol, Honolulu, HI 96822 USA Univ Hawaii Honolulu HI USA 96822 h Sci & Technol, Honolulu, HI 96822 USA Alfred Wegener Inst Polar & Marine Res, D-27515 Bremerhaven, Germany Alfred Wegener Inst Polar & Marine Res Bremerhaven Germany D-27515 rmany Skidaway Inst Oceanog, Savannah, GA 31411 USA Skidaway Inst Oceanog Savannah GA USA 31411 eanog, Savannah, GA 31411 USA
Titolo Testata:
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
, volume: 2, anno: 2001,
pagine: NIL_13 - NIL_43
SICI:
1525-2027(20010125)2:<NIL_13:COTMDA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
EMILIANIA-HUXLEYI PRYMNESIOPHYCEAE; DIATOM PHAEODACTYLUM-TRICORNUTUM; PHOTOSYNTHETIC C-13 FRACTIONATION; CENTRAL EQUATORIAL PACIFIC; MEASURING SPECIFIC RATES; INORGANIC-CARBON; GROWTH-RATE; MARINE DIATOM; GEPHYROCAPSA-OCEANICA; CO2 CONCENTRATION;
Keywords:
Emiliania huxleyi; isotopic fractionation; alkenones; UK37K '; coccolithophorid; algal cultures; organic marine chemistry; geochemistry; stable isotopes; biogeochemical processes;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
103
Recensione:
Indirizzi per estratti:
Indirizzo: Laws, EA Univ Hawaii, Sch Ocean & Earth Sci & Technol, Honolulu, HI 96822 USA Univ Hawaii Honolulu HI USA 96822 echnol, Honolulu, HI 96822 USA
Citazione:
E.A. Laws et al., "Controls on the molecular distribution and carbon isotopic composition of alkenones in certain haptophyte algae", GEOCH GEO G, 2, 2001, pp. NIL_13-NIL_43

Abstract

Although the biochemical functions and biosynthetic pathways of alkenones are still largely unknown, alkenone unsaturation ratios are now used extensively to infer ancient sea surface temperature, and their isotopic compositions have been used to reconstruct ancient atmospheric CO levels. The inferred relationships between alkenone unsaturation ratios, isotopic compositions, and growth conditions are based on empirical laboratory and field studies and, in the case of isotope fractionation, on simple models of carbon acquisition and fixation. Significant uncertainty still exists concerning thephysiological and ecological factors affecting cellular production of alkenones, unsaturation ratios, and isotopic composition. Phytoplankton cultureconditions have been shown to affect alkenone unsaturation ((K'U)(37)), cellular alkenone content, intracellular isotopic compositions (Delta delta),and changes in fractionation (epsilon (P)) as a function of the quotient of algal growth rate and aqueous carbon dioxide concentration (mu /CO2). Such studies imply that plant physiology can affect the interpretation of environmental signals. The factor(s) controlling cellular alkenone concentrations and unsaturation ratios are reviewed, as well as the carbon isotopic composition of the alkenone-producing algae. A new technique is presented to determine growth rates of the alkenone-containing algae in natural settings that will facilitate testing laboratory-based hypotheses concerning the carbon isotopic fractionation and its relationship to growth rate/growth status of alkenone-producing algae in the field.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:45:52