scholarly journals Diatom species composition of the Nisava river and its tributaries Jerma and Temska rivers (southern Serbia)

2012 ◽  
Vol 64 (3) ◽  
pp. 1127-1140 ◽  
Author(s):  
Jelena Andrejic ◽  
Jelena Krizmanic ◽  
M. Cvijan
Keyword(s):  
Species Composition ◽  
Benthic Diatom ◽  
Future Research ◽  
Diatom Species ◽  
Diatom Flora ◽  
Chemical Agents ◽  
Floristic Analysis

The main objective of this paper is to report the diatom taxa identified from the Nisava River and its tributaries, the Jerma and Temska rivers. The study area included 11 sampling sites along the Nisava River, with one site on the Jerma River and one on the Temska River. Monthly samples (from stones, sediments and macrophytes) were collected from May 2008 to May 2009. Diatom frustules were cleaned with chemical agents, and mounted on permanent slides. In total, 194 diatom taxa were identified. The most species rich genera are Navicula (25), Nitzschia (17) and Gomphonema (13), while other genera are presented with one or more species. Detailed floristic analysis of the benthic diatom flora has not been conducted before on these rivers. Therefore, this paper provides a baseline for future research.

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 Similar small-scale variation of diatom assemblages on different substrates in a mesotrophic stream

2015 ◽  
Vol 74 (2) ◽  
pp. 363-376 ◽  
Author(s):  
Maria Kahlert ◽  
Ivana Savatijević Rašić
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Spatial Variation ◽  
Anthropogenic Impacts ◽  
Sampling Site ◽  
Small Distance ◽  
Benthic Diatom ◽  
Small Scale ◽  
Diatom Species ◽  
Diatom Assemblages

Abstract The aim of the present study was to analyze if small-scale spatial variation of benthic diatom assemblages has consequences for biomonitoring. Benthic diatom samples were collected at one sampling site in a mesotrophic stream in Middle-Sweden from stone and plant (macrophytes and mosses) substrate. Our results showed that spatial variation of both the diatom species composition and the calculated bioindices were similar on both small (distance of centimeter) and medium (distance of decimeters) scales. Spatial variation was also similar on both studied substrates. This implies that it does not matter if a small or a larger area is sampled for biomonitoring as long as no major environmental factors impact certain sites systematically. Diatom assemblages and indices were significantly different between substrates. Spatial variation did not contribute much to this variation, and variation on a slide was unimportant. These results confirm earlier findings that smallscale spatial variation is not a problem when using diatoms to detect anthropogenic impacts to a stream or lake.

scholarly journals Diatom species composition and their seasonal dynamics in the Timok River basin

2021 ◽  
pp. 4-4
Author(s):  
Nikola Đukić ◽  
Tatjana Jakšić ◽  
Olivera Papović ◽  
Predrag Vasić
Keyword(s):  
Hydrogen Peroxide ◽  
Quantitative Analysis ◽  
Species Composition ◽  
River Basin ◽  
Seasonal Dynamics ◽  
Organic Material ◽  
Ecological Study ◽  
Research Work ◽  
Benthic Diatom ◽  
Diatom Species

The aim of this paper was to present the composition and seasonal dynamics of epilthic diatoms in the Timok River basin. The diatom samples were collected along the Timok River basin in March, May, August and November 2017. Permanent diatom slides were prepared after oxidizing the organic material by the hydrogen peroxide (H 2 O 2). The cleaned diatom materials were mounted on permanent slides using ZRAX glue. A total of 85 taxa were identified in the Timok River Basin. The benthic diatom taxa belong to 31 gene ra with the highest diversity observed within Navicula Bory (15), Nitzschia Hassall (12) and Gomphonema Ehrenberg (8). Quantitative analysis showed that in all seasons, Achnanthidium minutissimum and Amphora pediculus were dominant taxa. In May, they were joined by the Achnanthidium pyrenaicum, Gomphonema olivaceum and Ulnaria ulna; in August by the Cocconeis placentula, Denticula kuetzingii, Melosira varians, Navicula metareichardtiana, Nitzschia capitellata, N. fonticola and N. palea; in November by the D. kuetzingii, G. olivaceum, G. pumilum, N. metareichardtiana, N. veneta, Nitzschia capitellata and N. palea and in March by A. pyrenaicum, Diatoma moniliformis, G. olivaceum, N. palea and U. ulna. Our research is the floristical and ecological study of benthic diatoms in this basin and can form the groundwork for further research work.

scholarly journals Epipelic Diatom Communities in Pengilon Lake Dieng, Central Java

2019 ◽  
Vol 125 ◽  
pp. 01023 ◽  
Author(s):  
Tri Retnaningsih Soeprobowati ◽  
Jumari ◽  
Riche Hariyati ◽  
Fini Wulandari
Keyword(s):  
Diversity Index ◽  
Benthic Diatom ◽  
Acidic Environment ◽  
Diatom Species ◽  
Diatom Flora ◽  
Central Java ◽  
Physical Chemical ◽  
Diatom Communities ◽  
Tropical Areas ◽  
High Diversity

Diatom communities in the lake have an advantage of environmental assessment and paleo reconstruction study, due to the ability of diatom preserved in the sediment. There are only limited studies about taxonomy, ecology, and diversity of diatom flora in tropical areas, especially Indonesia. The main objective of the research is to describe the structure of benthic diatom communities in Pengilon Lake, together with physical chemical variables. Sediment samples were collected at an altitude of more than 2,000 msal habitats with pH around 5.40-6.86. A total of 83 diatom species identified as belonging to 16 families. The diversity index ranges from about 2.25 to 3.01 indicated the ecosystem that naturally stable with none diatom dominant. The most abundant genera were Eunotia with high diversity around 14 taxa. The composition of Eunotia assemblages was different among habitat and season variation. Eunotia has a wide tolerance of pH because of its ability to survive in an area with an acidic environment and circumneutral water. The most dominance diatom species in Pengilon Lake were Eunotia paludosa (Grunow) 39.2%, Nitzschia frustulum (Kutzing) 28.1%, Pinnularia viridis (Krammer & Lange-Bertalot) and Pinnularia divergentissima (Grunow) 24.6%.

Inhibitory effect of benthic diatom species on three aquaculture pathogenic vibrios

2017 ◽  
Vol 27 ◽  
pp. 131-139 ◽  
Author(s):  
Ceres A. Molina-Cárdenas ◽  
M. del Pilar Sánchez-Saavedra
Keyword(s):  
Inhibitory Effect ◽  
Benthic Diatom ◽  
Diatom Species ◽  
Pathogenic Vibrios

Distribution of moss-inhabiting diatoms along an altitudinal gradient at sub-Antarctic Îles Kerguelen

2007 ◽  
Vol 19 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Niek J.M. Gremmen ◽  
Bart van de Vijver ◽  
Yves Frenot ◽  
Marc Lebouvier
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Altitudinal Gradient ◽  
Cross Validation ◽  
Strong Relationship ◽  
Distribution Patterns ◽  
Common Species ◽  
Important Variable ◽  
Diatom Species ◽  
Expected Species Richness

Altitudinal gradients provide excellent opportunities to study relationships between species distribution and climatic variables. We studied the species composition of 39 samples of moss-inhabiting diatoms, collected at 50 m intervals from 100–650 m above sea level. The samples contained a total of 130 diatom species, of which 51 occurred in 10 or more samples. Altitude appeared to be the most important variable explaining variation in species composition. Of the 51 common species, 33 showed a significant relationship with altitude. Although the majority of the latter declined with increasing altitude, for nine species the probability of occurrence first increased with increasing elevation, but decreased again at higher altitudes, and four species increased systematically with elevation. As a result, expected species richness per sample decreased from an estimated 43 at 100 m to 25 species per sample at 650 m. Diatom distribution patterns proved to be suitable predictors of the altitudinal position of sample sites. Cross-validation yielded a strong relationship between predicted and observed altitudes.

scholarly journals Analysis of the type material of Achnanthes minutissima var. macrocephala (Bacillariophyta) and description of two new small capitate Achnanthidium species from Europe and the Himalaya

2019 ◽  
Vol 152 (2) ◽  
pp. 340-350
Author(s):  
Carlos E. Wetzel ◽  
Ingrid Jüttner ◽  
Smriti Gurung ◽  
Luc Ector
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Benthic Diatom ◽  
Original Material ◽  
Diatom Species ◽  
The World ◽  
Freshwater Habitats ◽  
The Himalaya ◽  
Scanning Electron ◽  
Achnanthes Minutissima

Background and aims – Two unknown benthic diatom species belonging to the genus Achnanthidium Kütz., and found in French and Nepalese freshwater habitats, were investigated. Both species are here described as new and compared with the original material of Achnanthes minutissima var. macrocephala Hust. [≡ Achnanthidium macrocephalum (Hust.) Round & Bukht.] from Indonesia. Methods – The morphology of three small and capitate Achnanthidium species was investigated using light microscopy (LM) and scanning electron microscopy (SEM). Key results – Achnanthidium coxianum sp. nov. (from the Himalaya) belongs to the group of species with hooked terminal raphe endings, while Achnanthidium peetersianum sp. nov. (from France) has variable terminal raphe endings which are usually slightly bent. Achnanthidium macrocephalum is a much rarer species and illustrations concerning its identity in the literature do not conform to the type studied here. Conclusions – The three species are similar in LM but clearly distinct in SEM. The shape of the areolae and terminal raphe endings separate the species. Achnanthidium macrocephalum has often been misidentified in studies from many areas of the world. It is similar to the new species in valve outline and in its small dimensions.

scholarly journals Chemical Weapons in the Iran-Iraq War (1980-1988). 1. Iraq Preparing for Chemical War

2019 ◽  
Vol 3 (1) ◽  
pp. 40-64
Author(s):  
Supotnitskiy M.V. Kovtun V.A.
Keyword(s):  
Iraq War ◽  
Middle Eastern ◽  
Future Research ◽  
Chemical Weapons ◽  
Technical Documentation ◽  
Industrial Base ◽  
Chemical Agents ◽  
Third World Country ◽  
Wide Range ◽  
Modern Chemical

The Iraqis became the first nation to use chemical weapons on the modern battlefield during the Iran-Iraq War (1980-1988). There are no general reviews and research available on this issue in Russian. It also puts the Russian researchers in an unequal position in comparison with their Western and Middle Eastern colleagues, who have such information from a wide range of sources. This lack of knowledge limits our ability to understand the secret mechanisms that trigger modern chemical wars in the Middle East. The analysis in the present study is based on different Western sources, UN and CIA materials. The article shows that Iraq – a third world country with the population of 16,3 million people in 1980-ies and relatively low educational level – could start its chemical weapons program only due to the Western aid and assistance (supplies of the precursors, technologies and technical documentation, education of specialists, diplomatic support ect). Only due to this assistance the Iraqi`s chemical weapons program could become successful. The industrial production of chemical agents and chemical munitions of various tactical purposes was established by the Iraqis in less than 10 years. By the end of the 1980-ies, the Iraqi chemists laid the foundations of the future research in the sphere of toxic chemicals. The industrial base for the production of CW have also been established. For Russia, the success of the Iraq`s chemical weapons program is a warning. It means that technically backward, but oil rich quasi-state can acquire chemical weapons in a few years with the clandestine support of the same «sponsors», and use it both for provocations and for conducting combat operations in the regions, vital for Russia`s interests.

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