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JPR Advance Access originally published online on December 16, 2004
Journal of Plankton Research 2005 27(2):159-166; doi:10.1093/plankt/fbh167
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Journal of Plankton Research Vol. 27 No. 2 © Oxford University Press 2004; all rights reserved

Relationship between biomass and enzymatic activity of a bloom-forming dinoflagellate (Dinophyceae) in southern Chile (41° S): a field approach

J. L. Iriarte1,2,*, R. A. Quiñones3 and R. R. González3

1 Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt Campus, PO Box 1327, Puerto Montt, Chile, 2 Oceanography Department, Universidad de Concepción, PO Box 160-C, Concepcion, Chile and 3 Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental (FONDAP-COPAS), Universidad de Concepción, PO Box 160-C, Concepción, Chile

* Corresponding Author: jiriarte{at}uach.cl

Received December 7, 2003; accepted in principle August 19, 2004; accepted for publication November 25, 2004; published online December 16, 2004

In a coastal area of southern Chile (41° S), the major ammonium assimilating enzyme glutamine synthetase (GS) was detected in a green dinoflagellate bloom during April 2003. High chlorophyll a concentrations (1000 µg L–1) attributable to Gymnodinium cf. chlorophorum in surface waters were associated with high and very low nitrate reductase activities. Coincident with the bloom, dissolved inorganic nitrogen concentrations were near the detection limit (NO3– + NH4+ <0.5 µM). Since GS correlates with the use of ammonium as an external nitrogen source, we suggest that GS activity seems to be a good indicator of ammonium utilization in a period dominated by a single dinoflagellate species.


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