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Phosphorus limitation of primary productivity in the eastern Mediterranean Sea

Krom, M.D., Kress, N., Brenner, S. and Gordon, L.I. (1991) Phosphorus limitation of primary productivity in the eastern Mediterranean Sea. Limnology and Oceanography, 36 (3). pp. 424-432. ISSN 0024-3590

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Abstract

Although NO3- is generally considered to limit primary productivity in most of the world’s oceans, previous studies have suggested the Mediterranean Sea may be an exception. In this study of the southeastern Mediterranean, we found that all the PO43- was removed from the upper water column during the winter phytoplankton bloom in the core and boundary of a warm-core eddy, while measurable (0.3-0.6 µM) NO3- remained. The N:P (NO3-: PO43-) ratio in the core and boundary of the Cyprus eddy was 27.4 and the slope of the linear portion of the N vs. P scattergram with 25.5 with a positive intercept of 0.5 µM on the NO3- axis. A similar N:P ratio (28-29), slope (21-23), and intercept (0.9-1.1) was found for the water column across much of the southern Levantine basin. These data, taken together with the results of incubation experiments, lead us to conclude that the southeastern Mediterranean is strongly P limited. The degree of P limitation increases from west to east across the entire basin. We suggest that removal of PO43 by adsorbtion on Fe- rich dust particles may be an important process controlling the concentration of P in the water column.

Item Type: Article
Copyright, Publisher and Additional Information: © Copyright 1991 by the American Society of Limnology and Oceanography Inc.
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds)
Depositing User: Repository Officer
Date Deposited: 23 Dec 2004
Last Modified: 08 Feb 2013 16:47
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/224

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