Ocean Science Journal

, Volume 45, Issue 3, pp 151–157

Blooms of Trichodesmium erythraeum in the South Eastern Arabian Sea during the onset of 2009 summer monsoon

  • K. B. Padmakumar
  • B. R. Smitha
  • Lathika Cicily Thomas
  • C. L. Fanimol
  • G. SreeRenjima
  • N. R. Menon
  • V. N. Sanjeevan
Article

DOI: 10.1007/s12601-010-0013-4

Cite this article as:
Padmakumar, K.B., Smitha, B.R., Thomas, L.C. et al. Ocean Sci. J. (2010) 45: 151. doi:10.1007/s12601-010-0013-4

Abstract

This study presents in situ evidence for the blooms of Trichodesmium erythraeum observed in the shelf waters of the South Eastern Arabian Sea (SEAS) during the onset of the southwest monsoon in June 2009. Evidence showed that water surface discoloration was caused by the accumulation of T. erythraeum, and that the water column contained a colony of T. thiebautii. The surface water color in the bloom region varied from pale brown to pinkish red. Pale brown indicated healthy algae at the peak of its photosynthetic activity, while pinkish red indicated the presence of photosynthetically less active filaments. Zooplankton abundance, especially copepodites, in the bloom area substantiated the theory that Trichodesmium filaments are excellent epiphytes to which the copepodites cling. The bloom area was very fertile with copious quantities of dissolved oxygen (6.85 ml L−1), PO4-P (0.108 μmol L−1) and SiO4 (1.29 μmol L−1). Lower NO3-N (0.028 μmol L1) values in the bloom area did not appear to affect Trichodesmium growth from molecular nitrogen fixation. However, lower NO3-N values altered the normal phytoplankton composition of this area.

Key words

Trichodesmium bloom Trichodesmium erythraeum Trichodesmium thiebautii South Eastern Arabian Sea summer monsoon 

Copyright information

© Korea Ocean Research & Development Institute (KORDI) and the Korean Society of Oceanography (KSO) and Springer Netherlands 2010

Authors and Affiliations

  • K. B. Padmakumar
    • 1
  • B. R. Smitha
    • 1
  • Lathika Cicily Thomas
    • 1
  • C. L. Fanimol
    • 1
  • G. SreeRenjima
    • 1
  • N. R. Menon
    • 2
  • V. N. Sanjeevan
    • 1
  1. 1.Centre for Marine Living Resources and EcologyMinistry of Earth SciencesKeralaIndia
  2. 2.School of Marine SciencesCochin University of Science & Technology and NERCIKeralaIndia

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