New records of centric diatoms from Yakutia (Bolshoe Toko Lake): SEM morphology, ecology and distribution

2018 ◽  
Vol 52 (2) ◽  
pp. 245-252 ◽  
Author(s):  
S. I. Genkal ◽  
V. A. Gabyshev
Keyword(s):  
Species Composition ◽  
River Basin ◽  
New Records ◽  
Water Bodies ◽  
Centric Diatom ◽  
Diatom Species ◽  
Centric Diatoms ◽  
Sem Study ◽  
First Time ◽  
Sem Morphology

As a result of a SEM study of phytoplankton, the first data on centric diatom species composition in Bolshoye Toko Lake, Yakutia, were obtained. Ten species (Aulacoseira — 5, Cyclotella — 1, Discostella — 1, Handmannia — 1, Pliocaenicus — 1) were found, and one taxon from the genus Pliocaenicus was identified to the genus level. Of these, nine taxa are reported for the first time in the water bodies of the Aldan River basin and Discostella guslyakovyi in Yakutia.

New records of Ephemeroptera from the Colombian Orinoco river basin of the Meta department

2017 ◽  
Vol 43 (2) ◽  
pp. 271
Author(s):  
Luis Gonzalo Salinas-Jiménez ◽  
José Ismael Rojas-Peña ◽  
Diana Paola Osorio-Ramírez ◽  
Clara Inés Caro-Caro
Keyword(s):  
River Basin ◽  
New Records ◽  
Andean Region ◽  
Orinoco River ◽  
First Time

There is extensive research of the Ephemeroptera communities taxonomy and ecology in the Andean region of Colombia. However, other regions such as the Orinoquia have been insufficiently studied. From this region, in the Meta department, four species have been registered: Varipes lasiobrachius Lugo-Ortiz & McCafferty, Coryphorus aquilus Peters, Miroculis (Atroari) colombiensis Savage & Peters and Tricorythopsis rondoniensis (Dias, Cruz & Ferreira). The main objective of this study is to report for the first time for this region the species: Mayobaetis ellenae (Mayo), Hydrosmylodon primanus (Eaton), Haplohyphes baritu Domínguez, Camelobaetidus edmundsi Dominique, Mathuriau & Thomas and Nanomis galera Lugo-Ortiz & McCafferty.

scholarly journals Range extension for Lacantunia enigmatica Rodiles-Hernández, Hendrickson & Lundberg, 2005 (Siluriformes, Lacantuniidae) in the Usumacinta river basin, Guatemala

Check List ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 161-167 ◽  
Author(s):  
Yasmín Quintana ◽  
Christian Barrientos ◽  
Rocio Rodiles-Hernández
Keyword(s):  
Water Level ◽  
River Basin ◽  
New Records ◽  
Range Extension ◽  
Rio Negro ◽  
First Time

The Lacantun Catfish, Lacantunia enigmatica, is reported for the first time in the Usumacinta river basin in Guatemala. Two specimens were collected in the Usumacinta tributaries Río La Pasión and Río Negro, which are characterized by seasonally fast-flowing deep channels and high fluctuations in water-level. We present a map with new records, and a brief description, and images of the specimens collected.

scholarly journals First record of the invasive snail Melanoides tuberculatus (Gastropoda: Prosobranchia: Thiaridae) in the Paranã River basin, GO, Brazil

2006 ◽  
Vol 66 (4) ◽  
pp. 1109-1115 ◽  
Author(s):  
F. Rocha-Miranda ◽  
M. J. Martins-Silva
Keyword(s):  
East Africa ◽  
River Basin ◽  
Thermal Water ◽  
First Record ◽  
Paraná River ◽  
Water Bodies ◽  
Parana River ◽  
First Time ◽  
Paraná River Basin

The Thiarid snail Melanoides tuberculatus (Müller, 1774), native to Asia and East Africa was recorded for the first time in the Paranã River basin, Goiás State. There is no evidence concerning introduction vectors but aquarium releases is the most probable vector. Specimens were collected at three different water bodies after twenty-seven rivers were investigated. The possible spread of this species to other habitats and potential effects on native thermal water communities are discussed.

A new species of Chasmogenus Sharp, 1882 and new records of Hydrophilidae (Coleoptera) from Northeastern Brazil

Zootaxa ◽  
2020 ◽  
Vol 4763 (4) ◽  
pp. 579-586
Author(s):  
TAYNÁ ALVES ◽  
BRUNO CLARKSON ◽  
LUCAS RAMOS COSTA LIMA
Keyword(s):  
New Species ◽  
River Basin ◽  
New Records ◽  
Northeastern Brazil ◽  
Adult Males ◽  
Northeast Region ◽  
First Time ◽  
A New Species

Chasmogenus cajuina sp. nov., a new species of the water scavenger beetle (Hydrophilidae: Acidocerinae) is described and illustrated, based on adult males, collected in the Lower Parnaíba River Basin, north of Piauí, Northeast Region of Brazil. In addition, Helochares (Sindolus) femoratus (Brullé, 1841) and Hydrobiomorpha spatula Bachmann, 1988 are recorded from Piauí State for the first time. 

scholarly journals NEW METHOD OF ESTIMATION OF THE RELATIVE AREA OF PERFORATIONS ON VALVES OF CENTRIC DIATOMS USING SEM IMAGES ON THE EXAMPLE OF MINIDISUS VODYANITSKIYI LYAKH ET BEDOSHVILI

2019 ◽  
Vol 21 ◽  
pp. 46-52
Author(s):  
Anton M. Lyakh ◽  
Yekaterina D. Bedoshvili ◽  
Olga V. Shikhat
Keyword(s):  
Land Plants ◽  
New Method ◽  
Centric Diatom ◽  
Relative Area ◽  
Diatom Species ◽  
Sem Images ◽  
Centric Diatoms ◽  
Diatom Valve ◽  
Small Valve ◽  
Valve Area

The diatoms interact with the environment through the siliceous frustule. The total area of frustule perforations determines the ability of diatom to exchange nutrients, gases and other matters. The aim of the present study was to estimate the area of perforations on the valve surface of a centric diatom. In the paper we describe a method for the estimation of the area of perforations on a diatom valve using SEM images. The method is tested on valves of centric diatom Minidiscus vodyanitskiyi Lyakh et Bedoshvili. The results show that the total area of cribral pores is less than 5% of the total valve area. This value is consistent with the relative perforation of land plants leaves, which is less than 3%. We hypothesize that such small valve area occupied by perforations is usual for many other centric diatom species. To verify this hypothesis additional researches are necessary.

scholarly journals The Sura River Basin Water Bodies’ Fractal Parameters

2018 ◽  
Author(s):  
Keyword(s):  
River Basin ◽  
Traditional Approach ◽  
Fractal Dimensionality ◽  
Shape Index ◽  
Water Area ◽  
River Network ◽  
Water Bodies ◽  
Box Counting ◽  
Basin Water ◽  
First Time

The Sura river basin water bodies (a river network with 800 watercourses and he Penza reservoir, the biggest on this territory with about 100 km2 water area) have been studied from the fractal geometry positions. The Sura River basin river network is characterized by Huck hydrological law. For the first time we present the methods of the river network fractal dimensionality determination with the use of Horton law and state the traditional approach with the use of the divider method. We have calculated fractal dimensionality of the Sura River basin river network by the both methods and have compared the results. As for the Penza Reservoir filled in 1979, we accurately hydrographically studied the banks, bottom and morphometric parameters as current in 2005. We give the method of box-counting, for the first time with its help we have calculated the reservoir bank lime fractal dimensionality. By the shape index, we have characterized the map layout of the Penza Reservoir and defined its place in the developed reservoirs’ classification according their map configuration complexity. This work material is meant as a supplement to the Scheme of the Sura River basin water bodies’ integrated use and protection.

The foliicolous lichen flora of Mexico. V. Biogeographical affinities, altitudinal preferences, and an updated checklist of 293 species

2004 ◽  
Vol 36 (5) ◽  
pp. 309-327 ◽  
Author(s):  
María De Los Ángeles HERRERA-CAMPOS ◽  
Robert LÜCKING ◽  
Rosa-Emilia PÉREZ ◽  
Álvaro CAMPOS ◽  
Paola Martínez COLÍN ◽  
...  
Keyword(s):  
Species Composition ◽  
New Records ◽  
Montane Forest ◽  
Costa Rican ◽  
Geographical Differentiation ◽  
Floristic Similarity ◽  
First Time ◽  
Very High ◽  
Montane Rainforest ◽  
Lichen Flora

An inventory of foliicolous lichens in Mexican lowland and montane rainforest revealed a total of 288 species, 238 of which are new records for the country, raising the number of reported lichen species to c. 1800. Among the new records, there are 29 recently described species and four new records for the Neotropics and the Americas, while five taxa are for the first time reported for Central America. The 293 species now known from Mexico comprise nearly two-thirds pantropical to cosmopolitan or intercontinentally distributed taxa, whereas little more than one-third are Neotropical or American, and only 6% are potentially endemic to the country. A comparison with other lowland and montane rainforest sites in Guatemala, Costa Rica and Ecuador shows that on average lowland sites have twice as many species as montane sites. Also, the differentiation in species composition between lowland and montane sites within the same region is more pronounced (63–75% similarity) than that between adjacent regions (96–99% similarity for lowland sites and 83–87% similarity for montane sites). This means that altitudinal preferences affect species composition more strongly than geographical differentiation. The latter is a function of distance, however, while Mexican and Guatemalan lowland (montane) sites share 96% (83%) of the species, these values drop to 74% (72%) when comparing Mexico with Ecuador. Nevertheless, overall floristic similarity is very high, with the lowest value of 54% shared species found between Mexican lowland and Costa Rican montane forest.

scholarly journals THE FIRST INVESTIGATONS OF CYANOTOXINS PRESENCE IN WATERBODIES AND WATERCOURCES OF BELARUS

2021 ◽  
Vol 0 (1) ◽  
pp. 52-62
Author(s):  
Tamara M. Mikheyeva ◽  
Keyword(s):  
Species Composition ◽  
Genetic Markers ◽  
Analytical Methods ◽  
Water Bodies ◽  
Toxic Species ◽  
Water Courses ◽  
Public Recreation ◽  
First Time ◽  
Water Blooms

The estimation of species composition, abundance and biomass of cyanobacteria in “bloom” as well as the search for toxic species has been undertaken for the first time in 20 water bodies and water courses of Belarus mainly used for public recreation. There were identified 50 representatives of cyanobacteria assigned to 18 genera, among them three species were marked for the first time for the Belarus: Snowella atomus Komárek et Hindák., Anabaenopsis arnoldii Aptekar, Anabaenopsis kelifii Kog. By combining molecular-biological and analytical methods and by using genetic markers when studying toxic «water blooms» the search of genes responsible for synthesis of hepatotoxic microcystin, nodularin, cylindrospermosin and neurotoxic saxitoxin was undertaken. It has been shown that in all the investigated lakes and rivers there were cyanobacterium relating to Anabaena and Microcystis genera that can synthesize highly toxic microcystins – LR, RR, YR. Saxitoxin synthesis genes and close to it variants of paralytic toxins such as goniatoksins 5, 6, dekarbamoilgoniatoksin 2, dekarbamoilsaksitoksin and neosaksitoksin were found in 7 waterbodies.

scholarly journals Chitinophilic zoosporic fungi in various types of water bodies

2014 ◽  
Vol 33 (1) ◽  
pp. 43-58 ◽  
Author(s):  
Bazyli Czeczuga ◽  
Anna Godlewska
Keyword(s):  
New Records ◽  
Water Bodies ◽  
Hydrochemical Analysis ◽  
Potato Beetle ◽  
Zoosporic Fungi ◽  
First Time

Chitinophilic fungi in various types of water bodies (slough, pond, beach pool, two lakes and two rivers) were studied. Samples of water were collected every other month for hydrochemical analysis and once a month ( 1992 - 1994) in order to determine the fungus content. The wings of dragonfly and flies, carapaces of crayfish and potato beetle and the fructification of two mushrooms were used as bait. Thirty species of chitinophilic fungi were found in various types of water bodiss. <i>Cytriomyces annulatus, Entophlyctis crenata, Obelidium megarrhizum, Rhopalophlyctis sareoptoides, Achlya colorata, A. megasperma</i> and <i>Dictyuchus monosporus</i> represent new records as chitinophilic fungi. However, <i>Entophlyctis crenata, Obelidium megarrhizum</i> and <i>Podochytrium chitinophilum</i> reported for the first time from Poland.

Thalassiosira duostra (Bacillariophyta), a new for the flora of Russia freshwater diatom species

2019 ◽  
Vol 53 (1) ◽  
pp. 7-14
Author(s):  
S. I. Genkal
Keyword(s):  
Species Composition ◽  
Original Description ◽  
Published Data ◽  
Diatom Species ◽  
Centric Diatoms ◽  
Internal Part ◽  
Quantitative Characteristics ◽  
Internal Arrangement ◽  
Freshwater Diatom

The study of archive materials has made it possible to specify species composition of the genus Thalassiosira and discover a new for the flora of Russia representative of centric diatoms, T. duostra, in Cheboksary and Tsimlyansk reservoirs and the Oka River. The valve diameter and number of central futoportulae in the examined material differ insignificantly from the original description and published data. By the general valve outline, structure and arrangement of central and marginal fultoportulae and quantitative characteristics, T. duostra is very similar to Сonticribra weissflogii and Thalassiosira faurii, which may result in inaccurate identification of these species. In the Сonticribra weissflogii the rimoportula is located not in a ring of marginal fultoportulae but closer to the valve center and its internal part is significantly larger than in Thalassiosira duostra. The external arrangement of marginal fultoportulae (tubes of the processes are outwardly directed at different angles) and their internal arrangement (the processes are arranged in two rings, they are more dense in the ring which is closer to the valve face) is a good specific feature that differentiates T. duostra and T. faurii.

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