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Rochelle Newall Emma, Ridame C., Dimier-Hugueney C., L'Helguen S. (2014). Impact of iron limitation on primary production (dissolved and particulate) and secondary production in cultured Trichodesmium sp. Aquatic Microbial Ecology, 72 (2), 143-153. ISSN 0948-3055

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Lien direct chez l'éditeur doi:10.3354/ame01690

Titre
Impact of iron limitation on primary production (dissolved and particulate) and secondary production in cultured Trichodesmium sp
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000335827500005
AuteursRochelle Newall Emma, Ridame C., Dimier-Hugueney C., L'Helguen S.
SourceAquatic Microbial Ecology, 2014, 72 (2), p. 143-153. ISSN 0948-3055
RésuméDiazotrophic cyanobacteria play an important role in biogeochemical cycles of carbon and nitrogen and, hence, in oceanic productivity in the tropical and subtropical regions of the ocean. Although many studies have examined the impact of iron (Fe) limitation on particulate primary production and dinitrogen (N-2) fixation in the colonial cyanobacterium Trichodesmium, none have looked at the impact of Fe limitation on the percentage extracellular release (PER) and secondary production (SP) in Fe-limited cultures of this cyanobacterium. Here, we present the results of a series of culture experiments during which we examined the impact of 3 concentrations of dissolved iron (DFe) on total primary production (TPP = dissolved + particulate primary production, i.e. DPP + PPP), PER and on SP. Under severe Fe limitation (5 nM DFe), biomass, growth rates, TPP and N-2 fixation were strongly reduced, while PER increased relative to the rates ob served at the highest Fe concentration. Moreover, reducing Fe concentration induced an increase in the percentage of photosynthetically fixed C used for algal growth, while the percentage of C used to support algal respiration decreased. Reduced Fe concentrations also induced a decrease in SP and in the SP: DPP ratio, indicating that the efficiency of transfer of fixed carbon from autotrophic to heterotrophic processes is reduced. This suggests that Fe, either directly through influencing cellular processes or indirectly through influencing organic matter structure or nitrogen availability, is controlling SP and, thus, microbial carbon utilization. These results suggest that the amount of carbon entering into the microbial loop may be reduced under Fe limitation, thus leading to an accumulation of dissolved organic carbon with potentially important impacts on microbial carbon cycling and, ultimately, on the biological carbon pump.
Plan de classementEcologie, systèmes aquatiques [036] ; Biotechnologies [084]
LocalisationFonds IRD [F B010062073]
Identifiant IRDfdi:010062073
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010062073

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