Fottea, 2012 (vol. 12), issue 1

Discostella tatrica sp. nov. (Bacillariophyceae) - a small centric diatom from the Tatra Mountain lakes (Slovakia/Poland).

Lenka Procházková, Václav Houk, Linda Nedbalová

Fottea 12(1): 1-12, 2012 | 10.5507/fot.2012.001  

A new small Discostella (Bacillariophyceae), D. tatrica Procházková, Houk et Nedbalová sp. nov., from lakes of the High Tatra mountains (Slovakia/Poland, Europe) is described here on the basis of light and electron microscopy. This species is reminiscent of D. guslyakowyi Genkal, Bondarenko et Popovskaya and D. stelligeroides (Hustedt) Houk et Klee. However, it differs from D. guslyakowyi in having alveolae in the central parts, and from D. stelligeroides in the possibility of having an incomplete stellate pattern in its convex central parts and possessing an alveolus in its concave central parts. The valve morphology...

Scalariella a new genus of monoraphid diatom (Bacillariophyta) with a bipolar distribution.

Catherine Riaux-Gobin*, Andrzej Witkowski, Manfred Ruppel

Fottea 12(1): 13-25, 2012 | 10.5507/fot.2012.002  

The identity of a small-celled diatom Naviculadicta pseudofallacia Witkowski, Metzeltin et Lange-Bertalot, originally described from Bear Island, southernmost island of the Norwegian archipelago Svalbard, is reconsidered. Observations of marine samples from the Kerguelen archipelago (Southern Ocean, Indian Ocean sector) revealed that this species also occurs in the Subantarctic region. The original classification within Naviculadicta was erroneous since this species is a monoraphid taxon and belongs to the Achnanthales. Its morphological features justify creating a new genus Scalariella Riaux-Gobin, which is distinguished...

Pinnularia aljustrelica sp. nov. (Bacillariophyceae), a new diatom species found in acidic waters in the Aljustrel mining area (Portugal) and further observations on the taxonomy and ecology of P. acidophila Hofmann et Krammer and P. acoricola Hustedt.

Ana T. Luís, Maria Helena Novais, Bart Van de Vijver, Salomé F.P. Almeida, Eduardo A. Ferreira da Silva, Lucien Hoffmann, Luc Ector

Fottea 12(1): 27-40, 2012 | 10.5507/fot.2012.003  

A new benthic freshwater diatom species belonging to the genus Pinnularia Ehrenb. has been recorded in the Água Forte stream surrounding the Aljustrel mining area in southern Portugal. Pinnularia aljustrelica Luís, Almeida et Ector sp. nov. is described as a new species based on light and scanning electron microscopy observations and on its particular habitat in an acidic environment due to acid mine drainage, high metal concentrations (As, Cd, Cu, Fe, Mn, Pb and Zn) and high sulphate and conductivity. The taxa most similar to P. aljustrelica are P. acidophila Hofmann et Krammer, P. acoricola Hustedt and P. acoricola...

Diatoms (Bacillariophyceae) from the Bolivian Altiplano: three new araphid species from the Desaguadero River draining Lake Titicaca.

Eduardo A. Morales, Maria Helena Novais, Gabriela Chávez, Lucien Hoffmann, Luc Ector

Fottea 12(1): 41-58, 2012 | 10.5507/fot.2012.004  

Three new araphid diatom species, Pseudostaurosira decipiens E. Morales, G. Chávez et Ector, P. sajamaensis E. Morales et Ector and Staurosira kjotsunarum E. Morales, Novais et Ector are described from a single sample taken from the Desaguadero River in the Bolivian Altiplano. These species clearly belong in their respective genera as evidenced by their morphological features studied using light (LM) and scanning electron microscopy (SEM). Pseudostaurosira decipiens is unique in its genus because of the combination of lanceolate-shaped valves with central area, well-developed spines lacking ligulae, siliceous deposits on outer...

Linking spatial distributions of sediment diatom assemblages with hydrological depth profiles in a plateau deep-water lake system of subtropical China.

Qian Wang, Xiangdong Yang, Paul B. Hamilton, Enlou Zhang

Fottea 12(1): 59-73, 2012 | 10.5507/fot.2012.005  

The spatial distributions of approximately 160 diatom taxa from surface sediments of the plateau deep-water Lugu Lake were investigated. The results exhibited a change in the sediment diatom composition with increasing water depth. The main patterns of variation, derived from a principal component analysis (PCA) and detrended correspondence analysis (DCA), showed that diatom community composition was divided into three depth gradients (near-shore zone; mid-depth zone; profundal deep zone). With increasing depth, the pattern of predominantly periphytic taxa in the shallow waters changed to planktonic assemblages dominated by Cyclotella ocellata,...

Ettliella tetraspora (Chlorophyta, Chlorophyceae): life cycle and taxonomy.

František Hindák, Alica Hindáková

Fottea 12(1): 75-81, 2012 | 10.5507/fot.2012.006  

The morphology and mode of reproduction in Ettiella tetraspora Hindák 1988, a green coenobial alga described from the Czech Republic and Finland, were studied from the plankton of the water reservoir Förmitzspeicher in NE Bavaria, Germany. The morphology of cells and coenobia of the species in this population was in agreement with published data for the species, but its reproduction was not of the Oocystis - type as it has been declared in the relevant literature. The protoplast of mother cells does not divide simultaneously into 4 autospores as in many coccal green algae, but always in two autospores. The first division of the mother cell is...

Intersection of Chlorella, Muriella and Bracteacoccus: Resurrecting the genus Chromochloris Kol et Chodat (Chlorophyceae, Chlorophyta).

Karolina Fučíková, Louise A. Lewis

Fottea 12(1): 83-93, 2012 | 10.5507/fot.2012.007  

Coccoid green algae generally are difficult to classify because of their depauperate morphology, and for this reason many of them have a complicated taxonomic history. In the present study we use analyses of molecular sequence data to demonstrate the close relationship of two green coccoid taxa that have undergone multiple taxonomic transfers in the past, and argue for the recognition of a distinct lineage. We resurrect the genus Chromochloris to accommodate C. zofingiensis (= Muriella zofingiensis) and we provide data regarding the lineage's phylogenetic relationships to other chlorophyte genera, especially Bracteacoccus,...

Desmids from Lake Nabugabo (Uganda) and adjacent peat bogs.

Alfred van Geest, Peter Coesel

Fottea 12(1): 95-110, 2012 | 10.5507/fot.2012.008  

In 2006 the desmid flora of Lake Nabugabo and some adjacent peat bogs was studied. All in total some 108 taxa were identified. Fourteen taxa, most of them being only known from the African continent, are discussed in detail. Six taxa are newly described: Euastrum gemmatum var. quadrituberosum, Micrasterias stuhlmannii var. nabugabonum, Cosmarium nabugabonum, Xanthidium thomassonii, Staurodesmus eckertii var. africanus and Staurastrum capitulum var. foersteri. The morphological variation found in Staurastrum longicolle is discussed in the light of possible speciation of desmids...

Diversity and ecology of desmids of peat bogs in the Jeseníky Mts: spatial distribution, remarkable finds.

Jana těpánková, Petr Hašler, Martina Hladká, Aloisie Poulíčková

Fottea 12(1): 111-126, 2012 | 10.5507/fot.2012.009  

Diversity and ecology of desmids (Zygnematophyceae) were studied within eight peat bog sites in the Jeseníky Mts during the years 2006-2009. Altogether, 51 taxa were found in the course of our investigation. A detailed study of spatial distribution of desmids in relation to environmental characteristics was performed. The composition of desmid communities was influenced especially by water table elevation and pH. Among all chemical substances measured and statistically tested, Mg, Ca and Pb concentrations appeared to have a considerable effect. Several remarkable desmid taxa were found and discussed in terms of their occurrence and broad morphological...

Opportunistic Cyanobacteria in benthic microbial mats of a tropical lagoon, Tikehau Atoll, Tuamotu Archipelago: minor in natural populations, major in cultures.

Katarzyna A. Palińska, Raeid M. M. Abed, Katja Wendt, Loic Charpy, Maria Łotocka, Stjepko Golubic

Fottea 12(1): 127-140, 2012 | 10.5507/fot.2012.010  

Studies in microbial ecology focus on identifying field dominant microbial populations using culture-independent tools, whereas minor populations are often ignored. We characterized the cyanobacterial populations from the Tikehau Atoll lagoon, Tuamotu Archipelago, which responded to standard culturing media.
The cultivation approach recruited cryptic cyanobacterial taxa, which were not observed in the studied mats, as revealed by microscopic comparison. Twelve strains belonging to the unicellular genera (Aphanothece Nägeli, Chlorogloea Wille and Cyanocystis Borzi) and the filamentous cyanobacteria with narrow filaments (Leptolyngbya...

Nomenclatural changes in heterocytous Cyanoprokaryotes (Cyanobacteria, Cyanophytes).

Jiří Komárek

Fottea 12(1): 141-148, 2012 | 10.5507/fot.2012.011  

The criteria for systematic classification of Cyanoprokaryota (Cyanobacteria, Cyanophyta) were changed considerably in last decades. The molecular and morphological analyses, ecological characterization and biochemical markers are indispensable premises for modern cyanobacterial taxonomic re-classification. Many genera were divided, newly described and numerous species were transferred in generic entities, characterized on the basis of molecular, ecological and revised morphological criteria. All of the proposed taxonomic changes are included in the manuscript of the recently prepared 3rd volume of "Cyanoprokaryotes" in the frame of the new edited...