, Volume 76, Issue 3, pp 293–302 | Cite as

Occurrence of Diatom – Diazotrophic association in the coastal surface waters of south Andaman, India

  • C. C. ManjumolEmail author
  • C. Linoy Libini
  • K. A. Albert Idu
  • K. S. Mohamed
  • V. Kripa


The heterocystous cyanobacterium Richelia intracellularis Schmidt 1901 is well known for its capability to fix atmospheric nitrogen (N2) in oligotrophic waters. Symbiotic associations of Richelia intracellularis with the diatoms Rhizosolenia hebetata, Rhizosolenia clevei, Rhizosolenia cylindrus and Hemiaulus membranaceus is reported for the first time from the coastal waters of South Andaman, India. In these the symbiotic associations, variations were observed in the number of vegetative cells, trichomes, and the shape of the heterocysts. The highest number of trichomes was observed in Rhizosolenia clevei (14) per host. The trichomes consisted of 9–10 vegetative cells and a spherical heterocyst that was orientiated toward one end of the host diatom cell. In Rhizosolenia hebetata, three trichomes of Richelia intracellularis were present, one trichome at one end with 7–8 vegetative cells and two trichomes at the other end. In Rhizosolenia cylindrus, two trichomes of Richelia were observed, with a spherical heterocyst and 5–6 vegetative cells. An association between Hemiaulus membranaceus and Richelia intracellularis was also observed but with less frequency. Trichomes were observed in the centre of the diatom. By using the cell-specific rates, the amount of new N provided by the Diatom-Diazotrophic Associations was estimated. This is the first record of a symbiotic association of Richelia in diatoms from Andaman coastal waters.


Cyanobacteria Richelia intracellularis Rhizosolenia hebetata Diazotrophy Hemiaulus membranaceus 



The authors are thankful to the Director, Central Marine Fisheries Research Institute, Kochi for facilities provided. They are grateful to the Ministry of Earth Sciences, New Delhi, for financial assistance.


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • C. C. Manjumol
    • 1
    Email author
  • C. Linoy Libini
    • 1
  • K. A. Albert Idu
    • 1
  • K. S. Mohamed
    • 2
  • V. Kripa
    • 2
  1. 1.Blacklip Pearl Oyster Laboratory, Fisheries Training CentreCentral Marine Fisheries Research InstitutePort BlairIndia
  2. 2.Central Marine Fisheries Research InstituteKochiIndia

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