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JPR Advance Access published online on March 11, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn036
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Successful establishment of the Ponto-Caspian alien cladoceran Evadne anonyx G.O. Sars 1897 in low-salinity environment in the Baltic Sea

Maria Põllupüü, Mart Simm, Arno Põllumäe and Henn Ojaveer

Estonian Marine Institute, University of Tartu, Mäealuse 10a, 12618, Tallinn, Estonia

Tel (+372)6718937 Fax (+372)6718900 E-mail: maria.pollupuu{at}ut.ee

Received on November 29, 2007; revised on March 5, 2008; accepted on March 7, 2008


  Abstract

Our new results confirm that the Ponto-Caspian cladoceran Evadne anonyx was first found in the Gulf of Finland in 1999. In the Gulf of Riga, the first specimens were detected in 2000. The observed distribution pattern, together with the recorded increase in the population density of the species of ca. 10 times during the years 2000-2006 indicate recent successful establishment of E. anonyx in the low-salinity conditions (< 5 psu) of the NE Baltic Sea. E. anonyx and the native E. nordmanni are present in mesozooplankton community from May to October. In the seasonal cyle, the maximum abundance of E. anonyx may occur later in the season than that of E. nordmanni. As the fecundity of the alien E. anonyx significantly exceeds that of the native E. nordmanni we suggest that population abundance of E. anonyx will very likely increase in future and the species may colonize new areas in the recently invaded ecosystem.

Key Words: alien Evadne anonyx • Baltic Sea • native Evadne nordmanni

Communicating Editor: Dr Roger Harris


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