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Closed Access item Low water column nitrogen fixation in the Mediterranean Sea: Basin-wide experimental evidence

Authors:Agawin, Nona S. R.
Tovar-Sánchez, Antonio
Stal, L. J.
Álvarez, Marta
Agustí, Susana
Duarte, Carlos M.
Issue Date:2011
Publisher:Inter Research
Citation:Aquatic Microbial Ecology 64: 135- 147 (2011)
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°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 N2 m-3 h-1). The highest rate was measured at a station characterized by relatively high concentrations of total dissolved P and dissolved Fe. Highδ 15N values (8.04 ± 2.03 %o) of the particulate organic nitrogen were in accordance with the observed low water column nitrogen fixation rates across the Mediterranean Sea. © 2011 Inter-Research.
Identifiers:doi: 10.3354/ame01511
issn: 0948-3055
Appears in Collections:(IMEDEA) Artículos

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