Fottea, 2009 (vol. 9), issue 2

Petr Marvan - 80 years

O. Lhotský

Fottea 9(2): i-xix, 2009  

List of reviewers Fottea 2007 - 2009

A. Poulíčková, P.Hašler

Fottea 9(2): xxi-xxii, 2009  

Pseudomarvania, gen. nov. (Chlorophyta, Trebouxiophyceae), a new genus for "budding" subaerial green algae Marvania aerophytica NEUSTUPA et ŠEJNOHOVÁ and Stichococcus ampulliformis HANDA.

Marek Eliáš, Jiří Neustupa

Fottea 9(2): 169-177, 2009 | 10.5507/fot.2009.017  

Several unicellular green algae exhibit a unique type of cell division, which can be likened to budding. These algae comprise Spongiochrysis hawaiiensis in Cladophorales (Ulvophyceae) and Stichococcus ampulliformis and species of the genus Marvania in the class Trebouxiophyceae. We determined the 18S rRNA gene sequence from Marvania aerophytica NEUSTUPA et ŠEJNOHOVÁ and inferred its phylogenetic position. Our analyses demonstrated that M. aerophytica is unrelated to other species of the genus Marvania (including the type species M. geminata), but together with S. ampulliformis forms a lineage within...

The genus Navigiolum (Bacillariophyceae) in Mediterranean and North African rock pool habitats: description of four new species from Algeria.

Horst Lange-Bertalot, Bruno Fumanti, Paolo Cavacini, Nadia Tagliaventi

Fottea 9(2): 179-185, 2009 | 10.5507/fot.2009.018  

Four new species of the recently established genus Navigiolum (Naviculaceae, Bacillariophyceae) are described from samples collected in ephemeral rock pools of Algeria (North Africa). These species are compared with three similar taxa, recently described from comparable habitats in Sardinia (Italy). With a single exception, Navigiolum is currently composed of species that can be considered endemic elements of the circum-mediterranean region and of unusual autecology. They are living in small freshwater pools that are subject to extreme fluctuation. The seven populations and several more from Sardinia and Algeria appear closely related...

Planothidium engelbrechtii (CHOLNOKY) ROUND & BUKHTIYAROVA: Identity and lectotypification (Bacillariophyta).

Pierre Compère, Bart Van de Vijver

Fottea 9(2): 187-192, 2009 | 10.5507/fot.2009.019  

Planothidium engelbrechtii (CHOLNOKY) ROUND et BUKHT. was originally described in 1955 from South Africa as Achnanthes engelbrechtii CHOLNOKY. It became necessary to revise the original type material because of some discrepancies between the original description and figures and the current allotment of this species to the genus Planothidium. The present study confirms the transfer of A. engelbrechtii to Planothidium. A lectotype is designated from Cholnoky's original material. Valves from the type material are illustrated and discussed by means of LM and SEM micrographs.

On the occurrence of Achnanthes thermalis var. rumrichorum (Bacillariophyceae) in Slovakia.

Alica Hindáková

Fottea 9(2): 193-198, 2009 | 10.5507/fot.2009.020  

The cell morphology of Achnanthes thermalis var. rumrichorum Lange-Bertalot, a first record for the territory of Slovakia and in Europe, was studied under LM and SEM and documented by micrographs. This diatom was found in the benthos of a gravel-pit lake in Bratislava and in artificial thermal basins in the health-resort park of Piešťany, Western Slovakia. A discussion of the morphological features of this taxon and their taxonomic affinities with related species is presented.

Morphology and formal description of Sellaphora bisexualis sp. nov. (Bacillariophyta).

David G. Mann*, Katharine M. Evans, Victor A. Chepurnov, Satoshi Nagai

Fottea 9(2): 199-209, 2009 | 10.5507/fot.2009.021  

Previous molecular genetic and life cycle studies have revealed the existence of a vigorously homothallic deme within the Sellaphora pupula species complex, which was given the provisional name of Sellaphora [pupula K-LB] Φ 'urban elliptical'. This is described here as S. bisexualis sp. nov., with a cox1 DNA-barcoded type from Scotland. A detailed description of frustule ultrastructure is given, the most complete for a Sellaphora species. The morphology of the terminal raphe fissure is variable, becoming vestigial in some small pre-auxospore valves, and the boundary between the raphe-sternum and striae is sometimes...

Incunabula and perizonium of Neidium (Bacillariophyta).

David G. Mann, Aloisie Poulíčková

Fottea 9(2): 211-222, 2009 | 10.5507/fot.2009.022  

The incunabula and perizonium of a paedogamous Neidium deme (in the N. ampliatum species complex) are described in detail using light and scanning electron microscopy. The incunabula contain two types of element, both heavily silicified. At each pole of the ellipsoidal zygote there is a large cap, which almost abuts its twin on either side of the zygote, beneath the gametangial valves. The caps are deeply and widely notched on their 'girdle' sides (i.e. on the sides of the zygote that underlie the gametangial girdle) and the space created by the notches is filled by large, almost triangular incunabular plates. Thus, on each side of the...

Morphology and taxonomy of selected cymbelloid diatoms from a Mongolian Sphagnum ecosystem with a description of three species new to science.

Maxim Kulikovskiy, Horst Lange-Bertalot, Andrzej Witkowski, Nadezhda Dorofeyuk

Fottea 9(2): 223-232, 2009 | 10.5507/fot.2009.023  

The present paper focuses on selected cymbelloid diatom taxa inhabiting Nur Sphagnum bog in northern Mongolia. Samples collected in this area contained numerous species of Encyonema KÜTZING and Cymbopleura (KRAMMER) KRAMMER, that are together acidobiontic, oligotraphentic taxa. Cymbopleura pernaviculiformis, Cymbopleura deviatkinii and Encyonema marvanii are described as species new to science. Furthermore, for two other species we suggest new nomenclatural combinations. The characteristics of Cymbopleura naviculiformis (AUERSWALD) KRAMMER sensu stricto are discussed in order to compare it with other species...

Nupela marvanii sp. nov., and N. lapidosa (KRASSKE) LANGE-BERTALOT in Poland with notes on the distribution and ecology of the genus Nupela (Bacillariophyta).

Agata Z. Wojtal

Fottea 9(2): 233-242, 2009 | 10.5507/fot.2009.024  

Two species of Nupela were identified in a spring and in a small spring-fed pool in the Polish Tatra Mts, - these were N. lapidosa and Nupela sp. The second species is described as N. marvanii. The new species is characterized by heteropolar, narrowly elliptic valves with capitate apices. Sternum valve has very short, sometimes rudimental raphe branches. Under a light microscope transapical striae are not discernible. Externally both valves are covered with hymen. The central area of sternum valves has irregular silicate thickenings. Proximal raphe fissures are straight and terminate in small pores. Distal raphe fissures...

Taxonomy, morphology and distribution of the Sellaphora stroemii complex (Bacillariophyceae).

Elisa Falasco, Saúl Blanco, Francesca Bona, Joan Gom, Daša Hlúbiková, Maria Helena Novais, Lucien Hoffmann, Luc Ector

Fottea 9(2): 243-256, 2009 | 10.5507/fot.2009.025  

Live and treated materials from three populations of diatoms collected in Italy, Slovakia and Spain, identified in previous inventories as Navicula stroemii HUST. sensu KRAMMER et LANGE-BERTALOT, were examined under light and scanning electron microscopy. The analyses highlighted the typical single H-shaped plastid, characteristic of the genus Sellaphora. Considering this, we thoroughly investigated type materials from the Sellaphora stroemii complex. According to the standard European diatom flora of KRAMMER & LANGE-BERTALOT (1986: Süßwasserflora von Mitteleuropa 2/1), six species should be considered as taxonomic synonyms...

Morphological examination and biogeography of the Gomphonema rosenstockianum and G. tergestinum species complex (Bacillariophyceae).

Maria Helena Novais, Saúl Blanco, Daša Hlúbiková, Elisa Falasco, Joan Gom, Cristina Delgado, Plamen Ivanov, Éva Ács, Manuela Morais, Lucien Hoffmann, Luc Ector

Fottea 9(2): 257-274, 2009 | 10.5507/fot.2009.026  

The type material of Gomphonema rosenstockianum LANGE-BERT. et E. REICHARDT from La Gomera (Canary Islands, Spain) and epilithic material of rivers from several European countries were examined using light and scanning electron microscopy in order to improve the knowledge on the taxonomical status of the G. rosenstockianum and G. tergestinum (GRUNOW) M. SCHMIDT species complex. Two other Gomphonema species, G. supertergestinum E. REICHARDT and G. angustius E. REICHARDT, recently described and belonging to the same group, are also presented in detail. After the analysis of several populations of G. rosenstockianum...

Cocconeis pediculus EHRENBERG and C. placentula EHRENBERG var. placentula (Bacillariophyta): Typification and taxonomy.

Regine Jahn, Wolf-Henning Kusber, Oscar E. Romero

Fottea 9(2): 275-288, 2009 | 10.5507/fot.2009.027  

The nominate varieties of the monoraphid diatoms Cocconeis pediculus EHRENBERG and C. placentula EHRENBERG are typified. Discrepancies from common concepts in Ehrenberg's types, habitats and descriptions were discovered which might affect our current understanding of both Cocconeis species. To ensure stabilization of names and concepts for these two taxa, epitypes from a location in Berlin close to the locus typicus are presented. Monoclonal cultures of these two taxa have been established. Morphological and morphometric data from clones as well as from populations for both taxa are presented. The taxonomy of C. pediculus...

New and recently described Gomphonema species (Bacillariophyceae) from Siberia.

Erwin Reichardt

Fottea 9(2): 289-297, 2009 | 10.5507/fot.2009.028  

This paper reports on five species of the genus Gomphonema, which seem to be widespread at least in Siberia or in other regions, too. Due to their wide distribution their knowledge is of special importance. Three species are described as new (G. demersum, G. jergackianum and G. marvanii) based on light- (LM) and scanning electron microscopical (SEM) investigations. Important characters delimiting these species from similar taxa are discussed. For two recently described species (G. liyanlingae METZELTIN et LANGE-BERTALOT and G. khentiiense METZELTIN, LANGE-BERTALOT et NERGUI) ultramicroscopical details or SEM micrographs...

Ultrastructure of a Hyalodiscus species (Bacillariophyceae; Subclass: Coscinodiscophycidae, Fam. Hyalodiscaceae) from brackish waters of Tonga, Oceania.

Eugen Rott, Werner Kofler, Robert Schabetsberger

Fottea 9(2): 299-306, 2009 | 10.5507/fot.2009.029  

A rarely recorded centric diatom of the genus Hyalodiscus was found in three mixed freshwater and brackish environments of Tonga. Both classical morphological and scanning electron microscopic features were used to classify the taxon within currently know taxa from inland and brackwater sites. We recorded stable ultrastructural features (e.g. type of poroids, type and arrangement of rimoportulae) but also several variable morphological features (mainly outline, diameter and structure of the umbilicus and nodulation within the umbilicus centre) as well as variable ultrastructural features (margin of central area; central termination of striae)....

Morphometric study of Navicula morphospecies (Bacillariophyta) with respect to diatom life cycle.

Jana Veselá, Jiří Neustupa, Martina Pichrtová, Aloisie Poulíčková

Fottea 9(2): 307-316, 2009 | 10.5507/fot.2009.030  

Quantitative and qualitative variation in valve morphology in strains of Navicula cryptocephala and N. trivialis were examined using conventional valve measurements (length, width, striae density) and landmark-based geometric morphometric method. The ability of morphometric techniques to distinguish individual strains on the basis of postinitial and/or sexually competent cells was assessed by multivariate analyses and permutation tests. The data showed that each strain had unique valve characters, which were shared by both large postinitial and small sexually competent cells. Landmarks representing central area and apical ends of the...

Palaeolimnology without a core: 153 years of diatoms and cultural environmental change in a shallow lowland lake (Belgium).

Luc Denys

Fottea 9(2): 317-332, 2009 | 10.5507/fot.2009.031  

Time series of diatom assemblage composition can be obtained from samples of various collection materials. This allows assessment of 'more natural' conditions and their temporal variability in shallow lakes and ponds, similar to traditional core-based palaeolimnology. Such information is useful to underpin restoration targets that are ecologically relevant and that conform to legal requirements posed by the European Water Framework Directive. Using sediment samples from herbarium macrophytes and other sources, historical conditions are documented for a shallow man-made soft-water lake in lower Belgium (Kraenepoel, Aalter). Both assemblage composition...

Diatom assemblage variations in the Aral Sea core C2/2004 over the past two millennia.

Anna Píšková, Tomáš Grygar, Jana Veselá, Hedi Oberhänsli

Fottea 9(2): 333-342, 2009 | 10.5507/fot.2009.032  

This study assesses changes in the environmental conditions in Chernyshov Bay (northern part of Aral Sea Western Basin) during the last ~2 ky from geochemical and diatom analyses of sediment core C2/2004. Comparison of fossil assemblages with the contemporary distribution of diatoms in the Aral Sea suggests that considerable changes occurred in water level as well as salinity. Deposits with high diatom concentrations and dominance of the marine species Actinocyclus octonarius EHRENBERG are interpreted as periods of high water level, whereas replacement by Tryblionella compressa (BAILEY) BOYER is considered to indicate lake level fall....

Effect of environmental improvements on the diatoms of the River Axe, southern England.

Martyn G. Kelly, Andrew Haigh, Jeanette Colette, Aleksandra Zgrundo

Fottea 9(2): 343-349, 2009 | 10.5507/fot.2009.033  

The River Axe, a lowland river in South-west England is used as a model system for describing how ecological status assessments can be applied in practice. Seasonal sampling over a three-year period established a strong baseline against which future changes could be assessed. These indicated that the river was enriched with nutrients and that ecological status was significantly below the good/moderate status boundary, implying the need for a Programme of Measures to be implemented. Reductions in both point and diffuse sources of nutrients led to changes in the diatom assemblage, reflected by increasing EQRs at monitored sites. An understanding of the...

DILSTORE software for ecological status assessment of lakes based on benthic diatoms.

Éva Hajnal, Csilla Stenger-Kovács, Éva Ács, Judit Padisák

Fottea 9(2): 351-354, 2009 | 10.5507/fot.2009.034  

Until recently, only few diatom indices were developed for monitoring littoral zones of lakes. The available indices are not applicable for all lake types because species lists and environmental constraints' ranges are different. So far, four diatom indices (SCIL, TDIL, S, TI) were developed that use attached diatoms for ecological status assessment therefore a need arose to ease index calculation similarly as it is a wide spread practice in status assessment of rivers by means of the well known OMNIDIA software. DILSTORE 1.1 software has three main functions; (i) calculation of diatom indices and community attributes; (ii) storage and listing of primary...

The structure and species richness of the diatom assemblages of the Western Carpathian spring fens along the gradient of mineral richness.

Markéta Fránková, Jindřiška Bojková, Aloisie Poulíčková, Michal Hájek

Fottea 9(2): 355-368, 2009 | 10.5507/fot.2009.035  

Species composition changes along the pH and calcium gradients within wetlands were frequently studied for different groups of organisms, but few data are available for algae. Here we list 188 diatom taxa collected as epibryon and epipelon at 13 spring fens in the Western Carpathians distributed along the gradient of mineral richness. Species richness decreased along the gradient from calcareous fens to mineral-poor Sphagnum-fens. In agreement with fen typology based on higher plants, bryophytes, and molluscs, the same four fen types were identified. For each spring-fen type indicator diatom species were suggested. Conductivity and pH appeared...