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Low water column nitrogen fixation in the Mediterranean Sea: basin-wideexperimental evidence
Agawin, N.S.R.; Tovar-Sanchez, A.; Stal, L.J.; Alvarez, M.; Agusti, S. (2011). Low water column nitrogen fixation in the Mediterranean Sea: basin-wideexperimental evidence. Aquat. Microb. Ecol. 64(2): 135-147. dx.doi.org/10.3354/ame01511
In: Aquatic Microbial Ecology. Inter-Research: Oldendorf/Luhe. ISSN 0948-3055, more
Peer reviewed article  

Available in Authors 

Keyword
    Trichodesmium Ehrenberg ex Gomont, 1892 [WoRMS]
Author keywords
    Nitrogen fixation; Trichodesmium sp.; Mediterranean Sea

Authors  Top 
  • Agawin, N.S.R.
  • Tovar-Sanchez, A.
  • Stal, L.J.
  • Alvarez, M.
  • Agusti, S.

Abstract
    The abundance and nitrogen fixation rates of Trichodesmium sp. integrated down to the deep chlorophyll maximum as well as nitrogen fixation rates in size-fractionated discrete surface water samples were measured across the Mediterranean Sea. The abundance of Trichodesmium sp. was generally low (< 50 trichomes m(-3)), except at one station in the Tyrrhenian Sea where the water temperature was >20 degrees C and Trichodesmium sp. was present at a higher density (ca. 700 trichomes m(-3)). Across the basin, size-fractionated nitrogen fixation rates were low (<250 nmol N-2 m(-3) h(-1)). The highest rate was measured at a station characterized by relatively high concentrations of total dissolved P and dissolved Fe. High delta N-15 values (8.04 +/- 2.03%) of the particulate organic nitrogen were in accordance with the observed low water column nitrogen fixation rates across the Mediterranean Sea.

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