CO2 and vitamin B-12 interactions determine bioactive trace metal requirements of a subarctic Pacific diatom

Phytoplankton growth can be limited by numerous inorganic nutrients and organic growth factors. Using the subarctic diatom Attheya sp. in culture studies, we examined how the availability of vitamin B-12 and carbon dioxide partial pressure (pCO(2)) influences growth rate, primary productivity, cellu...

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Bibliographic Details
Published in:The ISME Journal
Main Authors: King, Andrew L., Sanudo-Wilhelmy, Sergio A., Leblanc, Karine, Hutchins, David A., Fu, Feixue
Other Authors: Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2011
Subjects:
phytoplankton
vitamin B-12
carbon dioxide
ocean acidification
trace metals
MARINE-PHYTOPLANKTON
THALASSIOSIRA-WEISSFLOGII
GROWTH LIMITATION
IRON
COASTAL
OCEAN
ZINC
TEMPERATURE
BACTERIA
CADMIUM
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
Pacific
Ocean acidification
Subarctic
Online Access:https://hal.science/hal-00687942
https://doi.org/10.1038/ismej.2010.211
Description
Summary:Phytoplankton growth can be limited by numerous inorganic nutrients and organic growth factors. Using the subarctic diatom Attheya sp. in culture studies, we examined how the availability of vitamin B-12 and carbon dioxide partial pressure (pCO(2)) influences growth rate, primary productivity, cellular iron (Fe), cobalt (Co), zinc (Zn) and cadmium (Cd) quotas, and the net use efficiencies (NUEs) of these bioactive trace metals (mol C fixed per mol cellular trace metal per day). Under B-12-replete conditions, cells grown at high pCO(2) had lower Fe, Zn and Cd quotas, and used those trace metals more efficiently in comparison with cells grown at low pCO(2). At high pCO(2), B-12-limited cells had similar to 50% lower specific growth and carbon fixation rates, and used Fe similar to 15-fold less efficiently, and Zn and Cd similar to 3-fold less efficiently, in comparison with B-12-replete cells. The observed higher Fe, Zn and Cd NUE under high pCO(2)/B-12-replete conditions are consistent with predicted downregulation of carbon-concentrating mechanisms. Co quotas of B-12-replete cells were similar to 5- to 14-fold higher in comparison with B-12-limited cells, suggesting that >80% of cellular Co of B-12-limited cells was likely from B-12. Our results demonstrate that CO2 and vitamin B-12 interactively influence growth, carbon fixation, trace metal requirements and trace metal NUE of this diatom. This suggests the need to consider complex feedback interactions between multiple environmental factors for this biogeochemically critical group of phytoplankton in the last glacial maximum as well as the current and future changing ocean. The ISME Journal (2011) 5, 1388-1396; doi:10.1038/ismej.2010.211; published online 20 January 2011

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