Journal Title
Title of Journal: Polar Biol
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Abbravation: Polar Biology
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Publisher
Springer-Verlag
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Authors: A Taton A Wilmotte J Šmarda J Elster J Komárek
Publish Date: 2010/08/05
Volume: 34, Issue: 2, Pages: 181-191
Abstract
A special cluster of filamentous falsebranched cyanobacteria isolated from littoral mat samples in coastal lakes of the Larsemann Hills region coll by D Hodgson was studied by a polyphasic approach This morphotype has several characters corresponding to the traditional genera Leptolyngbya morphology of trichomes Pseudophormidium type of false branching or Schizothrix occasional multiple arrangement of trichomes in the sheaths However this cluster of strains is distinctly isolated according to its phylogenetic position based on 16S rRNA gene sequences and thus a separate generic classification is justified The cytomorphology of this generic entity is also characteristic Therefore a new genus Plectolyngbya with the type species P hodgsonii was described The same cyanobacterial morphotype was found in the littoral zone of the partially frozen inland Monolith Lake in the northern deglaciated area of James Ross Island in the NW part of the Weddell Sea Plectolyngbya hodgsonii occurs evidently in more Antarctic lakes of the continental type under very particular conditions littoral with average temperature below 3°C during the Antarctic summer season with periodical drying and freezing for more than 8 months in a year The valid definition phenotype documentation and ultrastructural characters of this cyanobacterium are presented in this article Morphologically and possibly genetically similar types are common in other habitats in various regions and represent probably different speciesThe authors thank Dominic Hodgson British Antarctic Survey Cambridge UK for providing the Antarctic material They are indebted also to Dobromila Klemová and to Ladislav Ilkovics for their skilled assistance in electron microscopy and Dana Švehlová for technical assistance The paper was prepared in the frame of grant supports of grant agencies of the Czech Republic GACR 206/05/0253 AV0Z60050516 a travel grant of the Czech Academy of Sciences/FNRS 1247 and the bilateral cooperation WallonieBruxelles International WBI/Czech Republic A Wilmotte is research associate of the FRSFNRS Funds for Scientific Research of Belgium and benefited from the FNRS Credit 1510404 A Taton had a FRIA fellowship
Keywords:
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- Heat hardening in Antarctic notothenioid fishes
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