Abstract
The physiology and biochemistry of many taxa inhabiting deep-sea hydrothermal vents have been elucidated1,2,3,4; however, the physicochemical factors controlling the distribution of these organisms at a given vent site remain an enigma after 20 years of research5,6,7,8,9,10,11. The chemical speciation of particular elements has been suggested as key to controlling biological community structure in these extreme aquatic environments7,11,12. Implementation of electrochemical technology13,14 has allowed us to make in situ measurements of chemical speciation at vents located at the East Pacific Rise (9° 50′ N) and on a scale relevant to the biology. Here we report that significant differences in oxygen, iron and sulphur speciation strongly correlate with the distribution of specific taxa in different microhabitats. In higher temperature (> 30 °C) microhabitats, the appreciable formation of soluble iron-sulphide molecular clusters markedly reduces the availability of free H2S/HS- to vent (micro)organisms, thus controlling the available habitat.
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Acknowledgements
We thank A. L. Reysenbach, K. Longnecker, the DSV Alvin pilots (P. Hickey, S. Faluotico and B. Williams), and the crew and Captain of the R/V Atlantis for their help and encouragement. This work was funded by grants from the National Science Foundation and the National Aeronautics and Space Administration, and by the University of Delaware Sea Grant Program through the National Oceanic and Atmospheric Administration, and the Devonshire Foundation.
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Luther, G., Rozan, T., Taillefert, M. et al. Chemical speciation drives hydrothermal vent ecology. Nature 410, 813–816 (2001). https://doi.org/10.1038/35071069
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DOI: https://doi.org/10.1038/35071069
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