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Biogeneration of chromophoric dissolved organic matter by bacteria and krill in the Southern Ocean
Limnology and Oceanography
  • Eva Ortega-Retuerta, Universidad de Granada
  • Thomas K Frazer, University of Florida
  • Carlos M Duarte, Instituto Mediterra´neo de Estudios Avanzados (CSIC-UIB)
  • Sergio Ruiz-Halpern, Instituto Mediterra´neo de Estudios Avanzados (CSIC-UIB)
  • Antonio Tovar-Sa´nchez, Instituto Mediterra´neo de Estudios Avanzados (CSIC-UIB)
  • Jesu´s M Arrieta, Instituto Mediterra´neo de Estudios Avanzados (CSIC-UIB)
  • Isabel Reche, Universidad de Granada
Document Type
Article
Publication Date
1-1-2009
Peer Reviewed
Peer-Reviewed
Abstract
Chromophoric dissolved organic matter (CDOM), the optically active fraction of dissolved organic matter, is primarily generated by pelagic organisms in the open ocean. In this study, we experimentally determined the quantity and spectral quality of CDOM generated by bacterioplankton using two different substrates (with and without photoproducts) and by Antarctic krill Euphausia superba and evaluated their potential contributions to CDOM dynamics in the peninsular region of the Southern Ocean. CDOM was generated by bacteria in all experiments, and the presence of photoproducts influenced both the quantity and the spectral quality of the resultant CDOM. We confirmed a direct link between bacterial production and CDOM generation, which yielded in situ CDOM duplication times from 31 to 33 d. Antarctic krill as a direct source of CDOM was also confirmed experimentally. We estimated that CDOM generation by krill would lead to CDOM duplication times from 0.48 to 0.80 d within krill swarms. Our findings highlight the potential significance of bacteria and Antarctic krill swarms in the generation of CDOM and underscore the dynamic nature of CDOM in this area.
Citation Information

Ortega-Retuerta, E, Frazer, TK, Duarte, CM, Ruiz-Halpern, S, Tovar-Sa´nchez, A, Arrieta, JM & Reche, I 2009, 'Biogeneration of chromophoric dissolved organic matter by bacteria and krill in the Southern Ocean', Limnology and Oceanography, vol. 54, no. 6, pp. 1941-1950.

Published version available from:

http://doi.org/10.4319/lo.2009.54.6.1941