%0 Journal Article
%T Potential cobalt limitation of vitamin B12 synthesis in the North Atlantic Ocean
%+ School of Marine and Atmospheric Sciences [Stony Brook] (SoMAS)
%+ Laboratoire d'océanographie et de biogéochimie (LOB)
%+ Department of Biological Sciences [Los Angeles]
%A Panzeca, C.
%A Beck, A.
%A Leblanc, Karine
%A Taylor, G.T.
%A Hutchins, D.A.
%A Sanudo-Wilhelmy, Sergio, A.
%< sans comité de lecture
%@ 0886-6236
%J Global Biogeochemical Cycles
%I American Geophysical Union
%V 22
%N GB2029
%P 7 pp
%8 2008-06-26
%D 2008
%R 10.1029/2007GB003124
%Z Sciences of the Universe [physics]/Earth Sciences/OceanographyJournal articles
%X While recent studies have confirmed the ecological importance of vitamin B12, it is unclear whether the production of this vitamin could be limited by dissolved Co, a trace metal required for B12 biosynthesis, but found at only subnanomolar concentrations in the open ocean. Herein, we demonstrate that the spatial distribution of dissolved B12 (range: 0.13-5 pmol L−1) in the North Atlantic Ocean follows the abundance of total dissolved Co (range: 15-81 pmol L−1). Similar patterns were observed for bacterial productivity (range: 20-103 pmol 3H leucine L−1 hr−1) and algal biomass (range: 0.4-3.9 μg L−1). In contrast, vitamin B1 concentrations (range: 0.7-30 pM) were decoupled from both Co and B12 concentrations. Cobalt amendment experiments carried out in low-dissolved Co waters (∼20 pmol L−1) enhanced B12 production two-fold over unamended controls. This study provides evidence that B12 synthesis could be limited by the availability of Co in some regions of the world ocean.
%G English
%2 https://hal.science/hal-00702673/document
%2 https://hal.science/hal-00702673/file/2007GB003124.pdf
%L hal-00702673
%U https://hal.science/hal-00702673
%~ INSU
%~ CNRS
%~ UNIV-AMU
%~ GIP-BE
%~ LOPB