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JPR Advance Access originally published online on November 22, 2005
Journal of Plankton Research 2005 27(12):1295-1300; 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

SHORT COMMUNICATION

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

Spyros Gkelis1,2, Maria Moustaka-Gouni1, Kaarina Sivonen2 and Tom Lanaras1,*

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

* Corresponding Author: lanaras{at}bio.auth.gr

Received June 1, 2005; accepted in principle August 25, 2005; accepted for publication October 7, 2005; published online November 22, 2005
Communicating editor: I.R. Jenkinson

Aphanizomenon ovalisporum is reported for the first time in Greece, in two warm, monomictic lakes. Aphanizomenon 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. High performance liquid chromatography (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).


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