Fottea, 2013 (vol. 13), issue 1
53rd conference of the Czech Phycological Society, Ostrava, September 2012.
Fottea 13(1): i-iii, 2013
Analysis of the type material of Pinnularia divergentissima (Grunow in Van Heurck) Cleve (Bacillariophyceae).
Bart Van de Vijver, Adéla Moravcová, Wolf-Henning Kusber, Jiří Neustupa
Fottea 13(1): 1-14, 2013 | 10.5507/fot.2013.001
The analysis of the type material of Pinnularia divergentissima (Grunow in Van Heurck) Cleve revealed the presence of two distinct Pinnularia taxa in the same slide. Comparison with the original drawing of P. divergentissima by Grunow showed that recent taxonomic treatments of P. divergentissima are not in accordance with the original diagnosis. Both species in the type material are morphologically characterized and the correct identity of P. divergentissima is established whereas the second taxon is described as P. pseudodivergentissima sp. nov. Additionally, the type material of P. fottii J.Bílý et...
New findings on the true-branched monotypic genus Iphinoe (Cyanobacteria) from geographically isolated caves (Greece).
Vasilik Lamprinou, Mariona Hernández-Mariné, Maria G. Pachiadaki, Konstantinos A. Kormas, Athena Economou-Amilli, Adriani Pantazidou
Fottea 13(1): 15-23, 2013 | 10.5507/fot.2013.002
The type of branching is a morphological character of great significance, separating taxa within the true-branched cyanobacteria. In this paper, true-branched morphospecies of cyanobacteria belonging to genus Iphinoe Lamprinou et Pantazidou, from different and geographically isolated caves of Greece, were investigated by coupling classical approach i.e. microscopy analysis (LM, SEM, TEM, CLSM) and molecular analysis (16S rRNA gene diversity). The morphological study revealed interspecific differences which could be attributed to adaptations to local conditions: Iphinoe cf. spelaeobios from the cave 'Diktaion Andron' (Crete island)...
A new species of Brasilonema (Scytonemataceae, Cyanoprokaryota) from Tolantongo, Hidalgo, Central Mexico.
Itzel Becerra-Absalón, Beatriz Rodarte, Karina Osorio, Luisa Alba-Lois, Claudia Segal-Kischinevzky, Gustavo Montejano
Fottea 13(1): 25-38, 2013 | 10.5507/fot.2013.003
New approaches in taxonomy and the introduction of molecular tools have substantially changed the taxonomy of cyanobacteria, leading to new genera and species being defined based on genetic and morphological investigations. In addition, molecular tools have confirmed several previously defined cyanobacteria genera, including some based on morphological and ecological features. Several of them have also been split into new generic entities, such as Brasilonema. In the central region of Mexico, several populations have been identified to share some traits with this new genus. In the region of Tolantongo, Hidalgo (Hgo), we found cyanobacteria populations...
Polyphasic evaluation of Limnoraphis robusta, a water-bloom forming cyanobacterium from Lake Atitlán, Guatemala, with a description of Limnoraphis gen. nov.
Jiří Komárek, Eliška Zapomělová, Jan Šmarda, Jiří Kopecký, Eliška Rejmánková, Jason Woodhouse, Brett A. Neilan, Jaroslava Komárková
Fottea 13(1): 39-52, 2013 | 10.5507/fot.2013.004
A tropical planktic filamentous cyanobacterium, tentatively identified as Lyngbya robusta, recently increased in abundance in Lake Atitlán, Guatemala, and since 2008 annual water-blooms occurred. This was one from the first known cases of L. robusta water-blooms worldwide. A polyphasic evaluation of L. robusta using 16S rRNA gene sequencing, cytomorphological markers, and ecological characteristics was made. This species had several unique features. It produced aerotopes that were irregularly spaced in cells; cyanotoxins were not found, and it fixed nitrogen in spite of the lack of heterocytes. It contained a high amount of carotenoids,...
Patterns of symmetric and asymmetric morphological variation in unicellular green microalgae of the genus Micrasterias (Desmidiales, Viridiplantae).
Fottea 13(1): 53-63, 2013 | 10.5507/fot.2013.005
Morphological symmetry and asymmetry in three clonal populations of Micrasterias cells was decomposed using a new geometric morphometric method specifically developed for shape analysis of complex symmetric structures. Micrasterias cells are symmetric relative to two perpendicular axes of symmetry: a left-right axis and a juvenile-adult axis. Shape variation is decomposed into a component of symmetric variation and other components of asymmetry. Principal component analysis suggested that symmetric variation and juvenile-adult asymmetry were dominant in describing morphological differences among objects in all three datasets. The left-right...
Phylogenetic position of Ecballocystis and Ecballocystopsis (Chlorophyta).
Shuang Xia, Huan Zhu, Ying-Yin Cheng, Guo-Xiang Liu, Zheng-Yu Hu
Fottea 13(1): 65-75, 2013 | 10.5507/fot.2013.006
Ecballocystis and Ecballocystopsis are two rare, green algal genera. Both have thalli that grow on rock surfaces in flowing water and attach to rocks by a thick mucilaginous pad. The algae have similar thalli structure, consisting of autospores in mother cell wall remnants. Ecballocystopsis differs from Ecballocystis in being filamentous instead of dendroid. In this study, new strains of Ecballocystis hubeiensis and Ecballocystopsis dichotomus were collected from China and cultured. Morphology was observed by light and electron microscopy. 18S rDNA and rbcL sequences were determined and subjected to phylogenetic analysis....
Induction of sexual reproduction in Spirogyra clones - does an universal trigger exist?
Melanie Zwirn, Charlotte Chen, Bohuslav Uher, Michael Schagerl
Fottea 13(1): 77-85, 2013 | 10.5507/fot.2013.007
Species identification of the ubiquitous green algae genus Spirogyra Link based on the traditional morphological species concept requires sexual reproduction stages including ripe hypnozygotes. Since these stages are only infrequently observed in nature, an artificial onset of the sexual phase in the laboratory would be most welcome. We therefore tried to induce conjugation in 95 strains of Spirogyra originating from various European sampling localities. A linear discriminant analysis based on a comparison of abiotic field data between sites with vegetative and conjugating filaments indicated that nitrate deprivation together with elevated organic...