Document Detail

Consistent fractionation of 13C in nature and in the laboratory: growth-rate effects in some haptophyte algae.
MedLine Citation:
PMID:  11540616     Owner:  NASA     Status:  MEDLINE    
The carbon isotopic fractionation accompanying formation of biomass by alkenone-producing algae in natural marine environments varies systematically with the concentration of dissolved phosphate. Specifically, if the fractionation is expressed by epsilon p approximately delta e - delta p, where delta e and delta p are the delta 13C values for dissolved CO2 and for algal biomass (determined by isotopic analysis of C37 alkadienones), respectively, and if Ce is the concentration of dissolved CO2, micromole kg-1, then b = 38 + 160*[PO4], where [PO4] is the concentration of dissolved phosphate, microM, and b = (25 - epsilon p)Ce. The correlation found between b and [PO4] is due to effects linking nutrient levels to growth rates and cellular carbon budgets for alkenone-containing algae, most likely by trace-metal limitations on algal growth. The relationship reported here is characteristic of 39 samples (r2 = 0.95) from the Santa Monica Basin (six different times during the annual cycle), the equatorial Pacific (boreal spring and fall cruises as well as during an iron-enrichment experiment), and the Peru upwelling zone. Points representative of samples from the Sargasso Sea ([PO4] < or = 0.1 microM) fall above the b = f[PO4] line. Analysis of correlations expected between mu (growth rate), epsilon p, and Ce shows that, for our entire data set, most variations in epsilon p result from variations in mu rather than Ce. Accordingly, before concentrations of dissolved CO2 can be estimated from isotopic fractionations, some means of accounting for variations in growth rate must be found, perhaps by drawing on relationships between [PO4] and Cd/Ca ratios in shells of planktonic foraminifera.
R R Bidigare; A Fluegge; K H Freeman; K L Hanson; J M Hayes; D Hollander; J P Jasper; L L King; E A Laws; J Milder; F J Millero; R Pancost; B N Popp; P A Steinberg; S G Wakeham
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Global biogeochemical cycles     Volume:  11     ISSN:  0886-6236     ISO Abbreviation:  Global Biogeochem Cycles     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1998-07-01     Completed Date:  1998-07-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100971590     Medline TA:  Global Biogeochem Cycles     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  279-92     Citation Subset:  S    
Department of Oceanography, University of Hawaii, Honolulu, USA.
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MeSH Terms
Algae, Green / growth & development*,  metabolism
Cadmium / analysis,  metabolism
Carbon Dioxide / analysis*,  metabolism
Carbon Isotopes
Cobalt / analysis,  metabolism
Hydrocarbons / metabolism
Iron / analysis,  metabolism
Phosphates / analysis*,  metabolism
Phytoplankton / growth & development*,  metabolism
Seawater / chemistry*
Zinc / analysis,  metabolism
Reg. No./Substance:
0/Carbon Isotopes; 0/Hydrocarbons; 0/Phosphates; 124-38-9/Carbon Dioxide; 7439-89-6/Iron; 7440-43-9/Cadmium; 7440-48-4/Cobalt; 7440-66-6/Zinc
Erratum In:
Global Biogeochem Cycles. 1999 Mar;13(1):251-2   [PMID:  11542812 ]

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