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JPR Advance Access originally published online on August 30, 2005
Journal of Plankton Research 2005 27(9):851-862; doi:10.1093/plankt/fbi057
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org.

The role of the diatom Cylindrotheca closterium in a mucilage event in the northern Adriatic Sea: coupling with high salinity water intrusions

Mirjana Najdek*, Maria Blazina, Tamara Djakovac and Romina Kraus

Center for Marine Research (CMR), Ruder Boskovic Institute, 52210 Rovinj, Croatia

* Corresponding Author: najdek{at}cim.irb.hr

Received June 6, 2005; accepted in principle July 26, 2005; accepted for publication August 25, 2005; published online August 30, 2005
Communicating editor: K.J. Flynn

The temporal and spatial distribution of mucilaginous aggregates, during the mucilage event of 2002 in the northern Adriatic, was studied in relation to waters of different salinity considering the aggregate’s age and proportion of Cylindrotheca closterium in its microphytoplankton community. The results showed that this epipelic diatom is a dominating species in the microphytoplankton community of freshly formed aggregates, in spite of its negligible abundance in the water column. The appearance and distribution of these aggregates in the water column was associated with water of higher salinity. The same pattern was observed in the summer of 2001, when a shorter and limited mucilage event occurred. These results suggest the importance of oligotrophic high salinity water intrusions from the central Adriatic for a selective accumulation of C. closterium cells. Coupling between the increased number and minimum growth state of C. closterium-accumulated cells might result in a hyperproduction of its own mucilage in these accumulation zones formed under the influence of high salinity water intrusions. In contrast, in the upper lower salinity water layers, under the influence of a freshwater input, the phytoplankton community of the freshly formed aggregates was similar to that of the surrounding water.


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