Fottea, 2014 (vol. 14), issue 2

Varied phenologies of Batrachospermum gelatinosum gametophytes (Batrachospermales, Rhodophyta) in two low-order streams.

Samuel A. Drerup, Morgan L. Vis

Fottea 14(2): 121-127, 2014 | DOI: 10.5507/fot.2014.009  

The freshwater red algal species, Batrachospermum gelatinosum, is common in temperate/borea regions North America and Europe. In southeast Ohio, gametophytes of this taxon were observed to have two different phenologies; in one stream the gametophytes were present only during the spring months and in another stream they were present year-round. Therefore, the purpose of this study was to determine environmental parameters associated with occurrence, peak vegetative growth and reproduction for B. gelatinosum gametophytes in these two streams. Field sampling was conducted for 18 months with both streams being sampled every three to four...

Desertifilum fontinale sp. nov. (Oscillatoriales, Cyanobacteria) from a warm spring in East Africa, based on conventional and molecular studies.

Pawan K. Dadheech, Huda Mahmoud, Kiplagat Kotut, Lothar Krienitz

Fottea 14(2): 129-140, 2014 | DOI: 10.5507/fot.2014.010  

Desertifilum is a filamentous cyanobacterium of crusts and biofilms, recently described from the extreme hot and dry Thar Desert in north-western India. A new species was isolated from a warm spring near Lake Bogoria, Kenya and was characterised by light and electron microscopy and phylogenetically using the 16S rRNA gene, beta and alpha subunits including intergenic spacer (cpcBA-IGS) and 16S-23S internal transcribed spacer (ITS). The aquatic habitat of the new material from Kenya revealed a wider distribution of members of this genus. The new taxon was found to be closest to Desertifilum tharense (Oscillatoriales). The separation of...

Seminavis recta comb. nov. et stat. nov.: morphology and distribution in salt marshes from southern Brazil.

Dávia Talgatti, Lucielle M. Bertolli, Lezilda C. Torgan

Fottea 14(2): 141-148, 2014 | DOI: 10.5507/fot.2014.011  

Cymbella (Encyonema) grossestriata var. recta was studied based on analysis of the type material from Argentina and newly collected material from southern Brazil. In light microscopy the taxon presents dorsiventral valves, asymmetric and expanded central area, striae slightly radiate at the ends, becoming strongly radiate, and sigmoid in the center of valve. In scanning electron microscopy it is possible to observe features that are similar to the Navicula genus, such as slit-like areolae, accessory rib in the primary side, which is wider (expanded) at the center and valves with a marked virgae. Beyond these features the presence of two...

Two new Gomphonema Ehrenberg (Bacillariophyceae) species from Macedonia and comparison with type material of G. brebissonii Kützing.

Danijela Mitić-Kopanja, Carlos E. Wetzel, Luc Ector, Zlatko Levkov

Fottea 14(2): 149-160, 2014 | DOI: 10.5507/fot.2014.012  

A large study on Gomphonema Ehrenberg species from Macedonia recently has been started. In this article two species are presented having unique set of characters than already known species and therefore are described as new species. The comparison was made using type material of G. brebissonii Kützing and G. gautieri (Van Heurck) Lange-Bertalot et Metzel tin. Gomphonema scardicum sp. nov. resembles G. montanum (Schumann) Grunow and G. brebissonii Kützing with respect to the valve outline and size. Main differential characters of G. scardicum are the cuneate shape of the headpole and less pronounced constriction near...

Variation in secondary structure of the 16S rRNA molecule in cyanobacteria with implications for phylogenetic analysis.

Klára Řeháková, Jeffrey R. Johansen, Mary B. Bowen, Michael P. Martin, Christopher A. Sheil

Fottea 14(2): 161-178, 2014 | DOI: 10.5507/fot.2014.013  

The analysis of the phylogenetic signal in the sequence of the 16S rRNA gene in cyanobacteria and bacteria has been primarily limited to use of unweighted primary sequence in various cladistic analyses. Such analyses ignore the significance of secondary structure in the 16S rRNA molecule. Structure of this molecule is directly tied to its function, and consequently changes in primary sequence that lead to changes in the secondary structure theoretically have greater evolutionary significance than those changes that do not lead to structural changes. Very little analysis of the impact of primary sequence data on the secondary structure of the small...

Seasonal variation of planktonic chrysophytes with special focus on Dinobryon.

Christina Bock, Ralph Medinger, Steffen Jost, Roland Psenner, Jens Boenigk

Fottea 14(2): 179-190, 2014 | DOI: 10.5507/fot.2014.014  

The diversity of chrysophytes is often underestimated in morphological surveys because of the limited amount of detectable characters under the light microscope. Addressing biodiversity issues solely based on morphological characters is further problematic since molecular analyses revealed a huge genetic diversity within morphotypes, even showing polyphyly in some morphological defined species. In order to address the seasonal variations of chrysophytes, 10 samples were collected in 2007 from the oligotrophic lake Fuschlsee (Salzkammergut, Austria). By using Dinobryon as a case study, we compared different gene phylogenies of single cells of...

The genus Stauroneis (Bacillariophyta) from the South Shetland Islands and James Ross Island (Antarctica).

Ralitsa Zidarova, Kateřina Kopalová, Bart Van de Vijver

Fottea 14(2): 201-207, 2014 | DOI: 10.5507/fot.2014.015  

During a survey of the freshwater aquatic and limno-terrestrial diatom flora of the Maritime Antarctic Region, five taxa belonging to the genus Stauroneis that could not be identified were observed. Based on detailed LM and SEM observations, these five taxa have been described as new taxa: Stauroneis australobtusa sp. nov., S. acidojarensis sp. nov., S. delicata sp. nov., S. jamesrossensis sp. nov. and S. reichardtiopsis sp. nov. Comments are made on their taxonomic position and separation from other species in this genus. Brief notes on the ecology and distribution of the five taxa are added. A compiled list...

Cocconeis napukensis sp. nov. (Bacillariophyceaea) from Napuka Atoll (South Pacific) and lectotypification of Cocconeis subtilissima Meister.

Catherine Riaux-Gobin, Pierre Compère, Michel Coste, François Straub, Lukas Taxböck

Fottea 14(2): 209-224, 2014 | DOI: 10.5507/fot.2014.016  

A 2012 microphytobenthos survey from coral reef environment at Napuka Atoll (Tuamotu Archipelago, South Pacific) focussed on diatom assemblages. Atolls are tropical carbonate, productive ecosystems, with a fast turnover, from which benthic diatom floras are poorly known. When compared to younger volcanic islands from the same area, Napuka shows a poor colonisation by benthic diatoms. Although normally rare, Achnanthales occur in the assemblages from Napuka. In the tidal zone, marine debris of sponge origin were colonized by several taxa, among others a small-celled Cocconeis here described as C. napukensis sp. nov. The new taxon has some...

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

Agata Z. Wojtal, Nadja Ognjanova-Rumenova, Carlos E. Wetzel, Friedel Hinz, Jolanta Piątek, Tatjana Kapetanovic, Luc Ector, Krisztina Buczkó

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

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...

A novel genus Ammassolinea gen. nov. (Cyanobacteria) isolated from sub-tropical epipelic habitats.

Petr Hašler, Petr Dvořák, Aloisie Poulíčková, Dale A. Casamatta

Fottea 14(2): 241-248, 2014 | DOI: 10.5507/fot.2014.018  

A new monospecific genus of an epipelic, filamentous oscillatorean Phormidium-like cyanobacterium is established. The genus was first discovered from a pond at Fiddlers Ridge Drive, Jacksonville, Florida, USA and subsequently isolated into uni-algal strains. During the process of cultivation, a combination of morphological, ultrastructural and molecular evidence supports the erection of a novel genus. Based on apomorphies which differ from related taxa such as heap-like colony formation, ultrastructural properties and molecular uniqueness, we propose the generic epithet Ammassolinea (sand-dwelling filaments).