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JPR Advance Access published online on September 1, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi058
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received March 19, 2005
Accepted August 25, 2005

Article

Mesozooplankton distribution in relation to hydrology of the Northeastern Aegean Sea (Eastern Mediterranean)

Stamatina Isari 1*, Alexis Ramfos 1, Stylianos Somarakis 1, Constantin Koutsikopoulos 1, Argyris Kallianiotis 1, and Nina Fragopoulu 1

1 Laboratory of Zoology, Department of Biology, University of Patras, 26500 Patra, Greece

* To whom correspondence should be addressed.
Stamatina Isari, E-mail: misari{at}upatras.gr


  Abstract

The Northeastern Aegean Sea (NEA) is the area where Black Sea waters (BSW) outflow in the Mediterranean enhancing local productivity and inducing high hydrographic complexity. We describe the structure and distribution (both vertical and horizontal) of mesozooplankton assemblages in the NEA during the thermal stratification period in July and September 2003, in an effort to identify BSW effects. The overall standing stocks of mesozooplankton in the NEA were much higher than those typically reported for other pelagic waters of the eastern Mediterranean. Higher abundance and biomass values and a distinctive copepod and cladoceran species assemblage were recorded in the surface layer (directly influenced by the BSW). Variability in the supply and subsequent advection of BSW in the NEA seemed to be the major factor affecting the structure and distribution of mesozooplankton assemblages. In July, lower surface salinity reflected the increased supply of BSW (rich in organic carbon) and, consequently, the abundance of filter feeding taxa (cladocerans, appendicularians, doliolids) was higher than in September. During both surveys, the copepod/cladoceran assemblages of the surface (0-50 m) layer were sensitive tracers of horizontal hydrological and biological variability (e.g. location of fronts) associated with the advection of the BSW.

Communicating Editor: KJ Flynn
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