Fottea, 2014 (vol. 14), issue 2

Fottea 14(2): 225-239, 2014 | 10.5507/fot.2014.017

Diversity of the genus Genkalia (Bacillariophyta) in boreal and mountain lakes - taxonomy, distribution and ecology.

Agata Z. Wojtal*,1, Nadja Ognjanova-Rumenova2, Carlos E. Wetzel3, Friedel Hinz4, Jolanta Pi±tek5, Tatjana Kapetanovic6, Luc Ector3, Krisztina Buczkó7
1 Institute of Nature Conservation, Polish Academy of Sciences, A. Mickiewicza 33, 31-120 Kraków, Poland; *Corresponding author e-mail: wojtal@iop.krakow.pl
2 Department of Paleontology, Stratigraphy and Sedimentology, Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev-Street 24, 1113 Sofia, Bulgaria
3 Department of Environment and Agro-biotechnologies (EVA), Public Research Centre - Gabriel Lippmann, Rue du Brill 41, 4422 Belvaux, Luxembourg
4 Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
5 Department of Phycology, W. Szafer Institute of Botany, Polish Academy of Sciences, Lubicz 46, 31-512 Kraków, Poland
6 Environmental Fund of the Federation of Bosnia and Herzegovina, Hamdije Čemerlíca 39A, BiH-71000 Sarajevo, Bosnia and Herzegovina
7 Department of Botany, Hungarian Natural History Museum, Könyves Kálmán krt. 40, 1476 Budapest, Hungary

Genkalia digitulus (Hustedt) Lange-Bert. et Kulikovskiy (≡ Navicula digitulus Hustedt) is recorded from several lakes in the northern Europe and from high altitude lakes all over Europe. Wide distribution and characteristic autecology of this species allow its use as a bioindicator of pH changes and reliable marker of environmental reconstruction. A comparison of specimens found in lakes from the Carpathian and Balkan Mountains with the type material of Genkalia digitulus (Hustedt) Lange-Bert. et Kulikovskiy resulted in description of a new species - G. boreoalpina Wojtal, C.E. Wetzel, Ector, Ognjanova-Rumenova et Buczkó. Genkalia boreoalpina is characterised by valve outline, size and parallel striae throughout most of the valve. The separation was based on light and scanning electron microscopy. Genkalia boreoalpina was the most common diatom of the genus from high mountain lakes of slightly acidic waters with a very low mineral content. The third species, Navicula subprocera Hustedt, was found in the Lake Câlcescu (Parâng Mountains) in alkaline waters and in a mountain fen in Herzegovina. The nomenclatorial combination to Genkalia was made for this species. Previously published data suggest there is a much larger diversity of species in the genus Genkalia and the cosmopolitan distribution of this group is mostly presented at the genus level.
 

Keywords: Balkans, Carpathians, morphological variability, Navicula, oligotrophy, pH change, type material

Received: April 16, 2014; Accepted: July 8, 2014; Published: September 1, 2014

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