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Titolo:
Effect of CO2 concentration on C : N : P ratio in marine phytoplankton: A species comparison
Autore:
Burkhardt, S; Zondervan, I; Riebesell, U;
Indirizzi:
Alfred Wegener Inst Polar & Marine Res, D-27570 Bremerhaven, Germany Alfred Wegener Inst Polar & Marine Res Bremerhaven Germany D-27570 rmany
Titolo Testata:
LIMNOLOGY AND OCEANOGRAPHY
fascicolo: 3, volume: 44, anno: 1999,
pagine: 683 - 690
SICI:
0024-3590(199905)44:3<683:EOCCOC>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
C-N-P; INORGANIC CARBON; SKELETONEMA-COSTATUM; LIMITED GROWTH; DIATOM; PHOSPHORUS; OCEAN; PHOTOSYNTHESIS; AVAILABILITY; BICARBONATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Burkhardt, S Alfredn,egener Inst Polar & Marine Res, Handelshafen 12, D-27570 Bremerhave Alfred Wegener Inst Polar & Marine Res Handelshafen 12 Bremerhaven Germany D-27570
Citazione:
S. Burkhardt et al., "Effect of CO2 concentration on C : N : P ratio in marine phytoplankton: A species comparison", LIMN OCEAN, 44(3), 1999, pp. 683-690

Abstract

The effect of variable concentrations of dissolved molecular carbon dioxide, [CO2,aq], on C:N:P ratios in marine phytoplankton was studied in batch cultures under high light, nutrient-replete conditions at different irradiance cycles. The elemental composition in six out of seven species tested wasaffected by variation in [CO2,aq]. Among these species, the magnitude of change in C:N:P was similar over the experimental CO2 range. Differences in both cell size and day length-dependent growth rate had little effect on the critical CO2 concentration below which a further decrease in [CO2,aq] ledto large changes in C:N:P ratios. Significant CO2-related changes in elemental ratios were observed at [CO2,aq] < 10 mu mol kg-l and correlated with a CO2-dependent decrease in growth rate. At [CO2,aq] typical for ocean surface waters, variation in C:N:P was relatively small under our experimental conditions. No general pattern far CO2-related changes in the elemental composition could be found with regard to the direction of trends. Either an increase or a decrease in C:N and C:P with increasing [CO2,aq] was observed,depending on the species tested. Diurnal variation in C:N and C:P, tested in Skeletonema costatum, was of a similar magnitude as CO2-related variation. In this species, the CO2 effect was superimposed on diurnal variation, indicating that differences in elemental ratios at the end of the photoperiod were not caused by a transient buildup of carbon-rich storage compounds due to a more rapid accumulation of carbohydrates at high CO2 concentrations. If our results obtained under high light, nutrient-replete conditions arerepresentative for natural phytoplankton populations, CO2-related changes in plankton stoichiometry are unlikely to have a significant effect on the oceanic carbon cycle.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 19:44:55