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JPR Advance Access published online on November 22, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi085
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received June 1, 2005
Accepted October 7, 2005

Short Communication

First report of the cyanobacterium Aphanizomenon ovalisporum Forti in two Greek lakes and cyanotoxin occurrence

Spyros Gkelis 1, Maria Moustaka-Gouni 2, Kaarina Sivonen 3, and Tom Lanaras 2 *

1 Department of Botany, P.O. Box 109, School of Biology, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece; Department of Applied Chemistry and Microbiology, P.O. Box 56, Viikki Biocenter, Helsinki University, Helsinki, FIN-000 14, Finland
2 Department of Botany, P.O. Box 109, School of Biology, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece
3 Department of Applied Chemistry and Microbiology, P.O. Box 56, Viikki Biocenter, Helsinki University, Helsinki, FIN-000 14, Finland

* To whom correspondence should be addressed.
Tom Lanaras, E-mail: lanaras{at}bio.auth.gr


  Abstract

Aphanizomenon ovalisporum is reported for the first time in Greece, in two warm, monomictic lakes. A. ovalisporum was dominant constituting 99% and 58% of the total cyanobacterial biomass in Lakes Lysimachia and Trichonis, respectively. Trichomes were solitary (length: 60-700 µm), were narrowed slightly at the ends, had a few terminal hyaline cells and had cells containing gas vesicles (length: 2.5-6.9, width: 2.4-5.1 µm). Heterocytes, spherical or ellipsoidal (length: 4.4-10.5, width: 2.41-5.1 µm) and akinetes (length: 16.0-27.8, width: 6.0-15.9 µm) were located in the middle of the trichome. HPLC analysis detected microcystin-LR (MC-LR) and a putative anabaenopeptin in the L. Lysimachia sample. The sestonic MC-LR concentration was 0.9 µg L-1. The origin of MC-LR in L. Lysimachia is discussed. The other cyanobacteria present were Pseudanabaena sp. and Planktothrix mougeotii (1% of the total cyanobacterial biomass).

Communicating Editor: IR Jenkinson
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