New taxa of the genus Navicula (Bacillariophyceae) in the diatom flora of Serbia

2014 ◽  
Vol 43 (2) ◽  
Author(s):  
Danijela Vidakovic ◽  
Jelena Krizmanić ◽  
Sanja Šovran
Keyword(s):  
New Taxa ◽  
Floristic Diversity ◽  
Diatom Species ◽  
River Ecology ◽  
Stone Surface ◽  
Diatom Flora ◽  
Acid Method ◽  
Epilithic Diatom

AbstractThe main objective of this paper is to report two benthic, epilithic diatom species from the Raška River. Samples were collected in April, June, August and November 2011 and March and May 2012 from 5 localities along the Raška River by scraping off the stone surface using a brush. Diatom frustules were first cleaned using the cold acid method, and then mounted on permanent slides. Descriptions (main valve measurements of the populations in the Raška River), ecology, distribution in Serbia and Europe, and appropriate photomicrographs of two species are presented. Navicula jakovljevicii Hustedt and Navicula catalanogermanica Lange-Bertalot & Hofmann are rarely found in Europe and these are new distributional records. These new taxa significantly contribute to diatom floristic diversity of the Raška River.

scholarly journals Diatom species composition in the Raska river (Southwestern Serbia)

2015 ◽  
pp. 29-40
Author(s):  
Danijela Vidakovic ◽  
Jelena Krizmanic ◽  
Sanja Sovran ◽  
Katarina Stojanovic ◽  
Jelena Djordjevic
Keyword(s):  
Species Composition ◽  
Benthic Diatom ◽  
Diatom Species ◽  
Diatom Flora ◽  
Epilithic Diatoms ◽  
Acid Method ◽  
Floristic Analysis

The paper presents data on the composition of epilithic diatoms in the Raska River. Samples were collected by scraping stone surfaces with a brush from 5 localities along the Raska River in April, June, August and November 2011 and March and May 2012. Diatom frustules were cleaned using cold acid method, and mounted on permanent slides. An investigation of the Raska River resulted in description of 106 diatom taxa. The most species rich genera are Navicula (10), Gomphonema (10) and Nitzschia (9), while other genera are presented with one or more species. Detailed floristic analysis of the benthic diatom flora in this river has not been conducted before. Therefore, this paper provides a groundwork for future researches.

Three new records for diatoms from the Nišava River and its tributary, the Jerma River (Southern Serbia)

2012 ◽  
Vol 41 (3) ◽  
Author(s):  
Jelena Andrejić ◽  
Jelena Krizmanić ◽  
Mirko Cvijan
Keyword(s):  
New Taxa ◽  
New Records ◽  
Benthic Diatom ◽  
Diatom Species ◽  
Diatom Flora ◽  
Floristic Richness ◽  
Chemical Agents ◽  
New Findings

AbstractThe main objective of this paper is to report three benthic diatom species from the Nišava and Jerma Rivers, which prove to be new findings in the context of the Serbian diatom flora. These are also new distributional records for all three species. Monthly samples (from stones, sediments and macrophytes) were collected from May 2008 to May 2009. Diatom frustules were cleaned using chemical agents, and mounted on permanent slides. Descriptions (main valve measurement of the populations in the Nišava and Jerma Rivers), ecology, distribution in Serbia and Europe, and appropriate photomicrographs of three species are presented. Navicula novaesiberica Lange-Bertalot and Neidiomorpha binodiformis (Krammer) Lange-Bertalot & Cantonati are rarely found in Europe, while Parlibellus protracta (Grunow) Witkowski is more common. Navicula novaesiberica and Neidiomorpha binodiformis were found at higher water temperatures in comparison to temperatures reported in the existing literature. These new taxa significantly contribute to diatom floristic richness of the Nišava and Jerma Rivers in Serbia.

scholarly journals Distrionella coxiana, a new fragilarioid diatom species (Bacillariophyceae) from Tierra del Fuego, Patagonia, Argentina

2019 ◽  
Vol 152 (2) ◽  
pp. 385-391
Author(s):  
Valeria Casa ◽  
Gabriela Mataloni ◽  
Bart Van de Vijver
Keyword(s):  
Typical Feature ◽  
Morphological Features ◽  
Tierra Del Fuego ◽  
New Taxon ◽  
Diatom Species ◽  
Unique Combination ◽  
Diatom Flora ◽  
Electron Microscopical ◽  
Scanning Electron ◽  
Freshwater Diatom

Background and aims – A few years ago, a new survey started of the freshwater diatom flora from peatbogs of Tierra del Fuego (southern Argentina). During this survey, an unknown fragilarioid diatom belonging to the genus Distrionella that could not be identified using the currently available literature was discovered. Methods – Using both Light Microscopical and Scanning Electron Microscopical techniques, the morphology of the unknown Distrionella species has been analysed. The new taxon is properly described, illustrated and compared with all other possible similar Distrionella taxa, known worldwide. Key results – Distrionella coxiana possesses a unique combination of morphological features that excludes conspecificity with all other members of the genus; it is characterized in having narrow, linear valves with small, capitate apices. Transapical ribs, a typical feature of the genus Distrionella, are only weakly developed. One rimoportula is observed close to the apices. Both apices have well-developed apical porefields. The girdle bands bear one complete row of poroids often accompanied by a second, incomplete row of small poroids. Notes on the occurrence and ecology of the new taxon are added.

scholarly journals The use of epilithic diatom assemblages in assessing land use in Silago, Southern Leyte, Philippines

2019 ◽  
Vol 12 (2) ◽  
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Tolerance Index ◽  
Diatom Species ◽  
Diatom Assemblages ◽  
Pollution Tolerance ◽  
Land Use Types ◽  
Freshwater Bodies ◽  
Forested Areas ◽  
Epilithic Diatom

Silago is a municipality in Southern Leyte in which logging for high-quality timber and land clearing for agricultural purposes threaten stream ecosystems. The objective of this study was to assess the response of diatom assemblages in relation to land use. Diatoms and water quality sampling was done at 27 sites on two sampling occasions (June and July 2014). Multiple diatom metrics were calculated to measure the response of diatoms to changes in land use. In all, 135 diatom species distributed to 48 genera were recorded. The results showed that diatom species and their attributes gave similar responses to those obtained in environmental variables. Pollution tolerance index classified all sampling sites as oligo-b-mesosaprobic. Meanwhile, Cymbella richness, percent motile taxa, and percent Achnanthidium minutissimum indicated good water quality in forested areas, distinguishing them from other land use types. Contrary to other studies, species richness was found to increase with greater degrees of disturbance, thus giving unreliable evaluation of water quality. Overall, the study suggests that epilithic diatoms can be applied in biomonitoring of freshwater bodies in the country.

A new species of Cymbella (Bacillariophyceae, Cymbellaceae) from the Pavana River, Western Ghats, India

Phytotaxa ◽  
2019 ◽  
Vol 395 (3) ◽  
pp. 209 ◽  
Author(s):  
ANBUKKARASU VIGNESHWARAN ◽  
MAXIM S. KULIKOVSKIY ◽  
ANTON GLUSHCHENKO ◽  
JOHN PATRICK KOCIOLEK ◽  
BALASUBRAMANIAN KARTHICK
Keyword(s):  
New Species ◽  
Western Ghats ◽  
Species Description ◽  
Diatom Species ◽  
Diatom Flora ◽  
Apical Pore ◽  
Lotic System ◽  
New Species Description ◽  
A New Species

New diatom species from the genus Cymbella is described, Cymbella pavanaensis from the Pavana River situated in Pimpri-Chinchwad, Pune, Maharashtra, India. The new species description is based on detailed LM and SEM morphological observations. Comparison of the new species with similar, previously-described taxa is made. C. pavanaensis belongs to a group of small-celled species of the genus, which lack differentiated, rounded porelli comprising the apical pore fields. This taxon is reported from a moderately to the highly-polluted urban lotic system, which signifies that even the diatom flora of easily accessible habitats of India is yet to be fully documented.

Pinnularia qinghainensis: a new diatom species (Bacillariophyta) found in the brackish Lake Qinghai, China

Phytotaxa ◽  
2021 ◽  
Vol 483 (1) ◽  
pp. 80-84
Author(s):  
LI-YING DENG ◽  
SAÚL BLANCO ◽  
BING LIU ◽  
SI-JIN QUAN ◽  
JI-YAN LONG
Keyword(s):  
Diatom Species ◽  
Undescribed Species ◽  
Lake Qinghai ◽  
Brackish Lake ◽  
Diatom Flora

During the investigations of the diatom flora of Lake Qinghai, China (see Liu et al. 2020 for details), specimens of an undescribed species of Pinnularia Ehrenberg (1843: 45) were encountered, which are hereby illustrated and described.

scholarly journals Epilithic diatoms (Bacillariophycae) from streams in Ramsar, Iran

2011 ◽  
Vol 70 (2) ◽  
pp. 167-190 ◽  
Author(s):  
Ali Soltanpour-Gargari ◽  
Martin Lodenius ◽  
Friedel Hinz
Keyword(s):  
Species Richness ◽  
High Conductivity ◽  
Nutrient Concentrations ◽  
Diatom Species ◽  
Epilithic Diatoms ◽  
Small Streams ◽  
High Nutrient ◽  
Northwest Iran ◽  
First Time ◽  
Epilithic Diatom

Epilithic diatoms (Bacillariophycae) from streams in Ramsar, Iran Epilithic diatoms were identified from five small streams and one canal in Ramsar, northwest Iran. Atotal of 155 diatom taxa belonging to 37 genera were found and only two species remained unidentified (Fragilaria sp. and Nitzschia sp.). Achnanthes, Nitzschia, Navicula, Cocconeis, Melosira, Amphora, Craticula, Diatoma, Surirella, Cymbella, Diploneis and Entomoneis were among the most abundant genera. Eighty seven taxa were recorded for the first time in Iran. Thirty two of the genera belong to the Pennales and 5 to the Centrales. Species richness was rather high ranging from 66 to 95 taxa at the six sites studied. The epilithic diatom species found in Ramsar were dominated by cosmopolitan taxa found in meso- to fairly eutrophicwaters with high conductivity and high nutrient concentrations. The abundances found at all six sites were compiled in order to estimate the overall abundance of each taxon in Ramsar. This study includes EM pictures of diatoms observed in Ramsar, Iran.

scholarly journals Epilithic diatom flora in Cali River hydrographical basin, Colombia

Rodriguésia ◽  
2019 ◽  
Vol 70 ◽  
Author(s):  
Carla Giselda Heinrich ◽  
Martha L Palacios-Peñaranda ◽  
Enrique Peña-Salamanca ◽  
Marilia Schuch ◽  
Eduardo A. Lobo
Keyword(s):  
Diatom Flora ◽  
Epilithic Diatoms ◽  
Epilithic Diatom ◽  
New Occurrences

Abstract This research aimed to study the composition of epilithic diatom flora found in samples collected in Cali River hydrographical basin, Colombia. Quarterly excursions (March, June, September and December of 2012 and March of 2013) were performed in six sampling sites to collect samples for identification of diatom organisms (Class Bacillariophyceae). The results indicated the occurrence of 82 taxa distributed in 26 families and 38 genera. 32 of these are new occurrences in Colombia. The most representative families were Gomphonemataceae, Naviculaceae and Bacillariaceae. The genera richest in species were Navicula, Gomphonema and Nitzschia. Eight species occurred in all sampling sites: Achnanthidium minutissimum, Cocconeis lineata, Cymbella affinis, Gomphonema pumilum var. rigidum, Melosira varians, Navicula symmetrica, Reimeria sinuata and Rhoicosphenia abbreviata. The results indicated 13 species considered dominant and characterize the flora of epilithic diatoms in Cali River hydrographical basin, Colombia.

scholarly journals Plant taxonomy and biodiversity researches in Bangladesh: trends and opportunities

2014 ◽  
Vol 3 (2) ◽  
pp. 324-344
Author(s):  
M Atiqur Rahman
Keyword(s):  
Environmental Management ◽  
New Taxa ◽  
Slow Rate ◽  
Conservation Management ◽  
Conservation Strategies ◽  
Floristic Diversity ◽  
Plant Taxonomy ◽  
Red Data Book ◽  
Threatened Taxa ◽  
Data Book

The progress, problems and prospects of biodiversity and plant taxonomic researches conducted in Bangladesh during the last two decades have been analyzed. The inventory of the flora, threatened taxa and family wise itemization in all groups of plants are progressing at a very slow rate. Only 11.6% of the estimated species (c.5000) were inventoried and only 6.2% of the threatened taxa were listed for conservation management. National Conservation Strategies could not be framed and implemented duly for environmental management. Results of the survey of floristic diversity, inventory of threatened taxa for Red Data Book and discovery of new taxa are discussed and up to date data are presented. DOI: http://dx.doi.org/10.3126/ije.v3i2.10645 International Journal of the Environment Vol.3(2) 2014: 324-344

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