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Low water column nitrogen fixation in the Mediterranean Sea: basin-wide experimental evidence

Agawin, N.S.R. and Tovar-Sanchez, A. and Stal, L.J. and Alvarez, M. and Agusti, S. and Duarte, C.M. (2011) Low water column nitrogen fixation in the Mediterranean Sea: basin-wide experimental evidence. Aquatic Microbial Ecology, 64, 135-147. ISSN 0948-3055.

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Official URL: http://dx.doi.org/10.3354/ame01511

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. High δ15N 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

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:9147
Deposited On:18 Aug 2011 02:00
Last Modified:14 Oct 2013 13:52

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