Marine Biology

, Volume 139, Issue 5, pp 991–998

Atmospheric dinitrogen fixation by benthic communities of Tikehau Lagoon (Tuamotu Archipelago, French Polynesia) and its contribution to benthic primary production

  •  C. Charpy-Roubaud
  •  L. Charpy
  •  A. Larkum

DOI: 10.1007/s002270100636

Cite this article as:
Charpy-Roubaud, C., Charpy, L. & Larkum, A. Marine Biology (2001) 139: 991. doi:10.1007/s002270100636

Abstract.

Acetylene reduction rates were measured in lagoonal sediments, cyanobacterial mats and limestone surfaces between 1991 and 1995 at many sites, depths and seasons; all the studied substrata contained cyanobacteria. The acetylene reduction/15N2 fixation ratio was measured for the different communities and varied between 1.8 and 4.8, depending on substratum. Fixation rates were 1.7 to 7 times higher during daylight compared to night-time rates. N2 fixation rates ranged from 0.4 to 3.9 mg N m–2 day–1 for the lagoonal sediment/mat communities, and the rate was about 2 mg N m–2 day–1 for the lagoonal limestone substrata. Total lagoonal benthic N2 fixation contributed 24.4% of the total nitrogen requirement for the benthic primary production of benthic communities of the lagoon. The input of N2 fixation by the microbial planktonic communities (including cyanobacteria) of the lagoon, which are highly productive, is unquantified but is likely to be large.

Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  •  C. Charpy-Roubaud
    • 2
  •  L. Charpy
    • 2
  •  A. Larkum
    • 1
  1. 1.Heydon-Laurence Building, School of Biological Sciences, University of Sydney, NSW 2006, Australia
  2. 2.IRD, Centre d'Océanologie de Marseille, Traverse de la Batterie des Lions, 13007 Marseille, France