Journal of Plankton Research Vol.21 no.12 pp.2431-2435, 1999
© Oxford University Press 1999
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The discovery of an Antarctic epipelagic medusan in the Mediterranean*
Institut de Ciències del Mar (CSIC), Plaça del Mar s/n, 08039 Barcelona, Catalonia, Spain, 1 Southampton Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK and 2 Bundesforschunganstalt für Fischerei, Institut für Seefischerei, Palmaille 9, D-22767 Hamburg, Germany
* This paper is dedicated to the memory of our research fellow Martin White.
A single specimen of the Antarctic anthomedusan Russellia mirabilis Kramp 1957 has recently been collected in the Alborán Sea. This is the first record for an Antarctic epipelagic organism in the Mediterranean Sea. Transport in the ballast water of a cargo ship seems the most plausible mechanism for explaining this rare occurrence. However, an alternative hypothesis is explored involving a possibly complex medusan life cycle together with the role of Antarctic (Intermediate and Bottom) water as dispersal mechanisms.