Abstract:A new species, Sellaphora balashovae sp. nov., from Lake Frolikha is described based on light (LM) and scanning electron microscopy (SEM). The systematic position of this new species is determined based on molecular data. This species is placed in the genus Sellaphora based on chloroplast morphology, areolae covered by external hymenes, and uniseriate striae that are typical for the genus. Molecular data support this taxonomic assignment, and the new species is part of a monophyletic group with some other memb… Show more
Diatoms (Bacillariophyta) are ubiquitous microalgae which produce a siliceous exoskeleton and which make a major contribution to the productivity of oceans and freshwaters. They display a huge diversity, which makes them excellent ecological indicators of aquatic ecosystems. Usually, diatoms are identified using characteristics of their exoskeleton morphology. DNA-barcoding is an alternative to this and the use of High-Throughput-Sequencing enables the rapid analysis of many environmental samples at a lower cost than analyses under microscope. However, to identify environmental sequences correctly, an expertly curated reference library is needed. Several curated libraries for protists exists; none, however are dedicated to diatoms. Diat.barcode is an open-access library dedicated to diatoms which has been maintained since 2012. Data come from two sources (1) the NCBI nucleotide database and (2) unpublished sequencing data of culture collections. Since 2017, several experts have collaborated to curate this library for rbcL, a chloroplast marker suitable for species-level identification of diatoms. For the latest version of the database (version 7), 605 of the 3482 taxonomical names originally assigned by the authors of the rbcL sequences were modified after curation. The database is accessible at https://www6.inra.fr/carrtel-collection_eng/Barcoding-database.
Diatoms (Bacillariophyta) are ubiquitous microalgae which produce a siliceous exoskeleton and which make a major contribution to the productivity of oceans and freshwaters. They display a huge diversity, which makes them excellent ecological indicators of aquatic ecosystems. Usually, diatoms are identified using characteristics of their exoskeleton morphology. DNA-barcoding is an alternative to this and the use of High-Throughput-Sequencing enables the rapid analysis of many environmental samples at a lower cost than analyses under microscope. However, to identify environmental sequences correctly, an expertly curated reference library is needed. Several curated libraries for protists exists; none, however are dedicated to diatoms. Diat.barcode is an open-access library dedicated to diatoms which has been maintained since 2012. Data come from two sources (1) the NCBI nucleotide database and (2) unpublished sequencing data of culture collections. Since 2017, several experts have collaborated to curate this library for rbcL, a chloroplast marker suitable for species-level identification of diatoms. For the latest version of the database (version 7), 605 of the 3482 taxonomical names originally assigned by the authors of the rbcL sequences were modified after curation. The database is accessible at https://www6.inra.fr/carrtel-collection_eng/Barcoding-database.
“…Works of the 20 th century have provided a large prac tical basis for subsequent study of diatoms (Dorogostaїskiy, 1904;Wislouch, 1924;Meyer, Reinhardt 1925;Skvortzow, Meyer, 1928;Meyer, 1930;Jasnitsky, 1936;Ska bichevskii, 1936Ska bichevskii, , 1985Skvortzow, 1937). Currently, the study of diatoms in Lake Baikal is actively continuing, in particular, the morphology of cymbelloid, naviculoid and monoraphid diatoms (Kulikovskiy et al, 2012, and recently, using molec ular data (Kulikovskiy et al, 2014(Kulikovskiy et al, , 2016Andreeva et al, 2018;Glushchenko et al, 2021Glushchenko et al, , 2022Kezlya et al, 2021).…”
In a sample taken by A. P. Skabitschewsky on 10 VII 1965 from bottom sediments surrounding the Ushkany Islands (Lake Baikal), the species Amphorotia baicalensis was found along with two new species described herein: Amphorotia skabitschewskii Glushchenko et Kulikovskiy, sp. nov. and Amphorotia skvortzowii Glushchenko et Kulikovskiy, sp. nov. All three are illustrated with light micrographs. A morphological description of the species and a comparison with similar taxa are given.
“…Kociolek sp. nov. from a Siberian mountain lake in the Baikal region added to the diatom flora of Russia(Andreeva et al, 2018). A new diatom genus, Okhapkinia Glushchenko, M. Kulikovskiy et.…”
This survey of 2018 literature on substratum-associated microbiota presents brief highlights on research findings from primarily freshwaters, but includes those from a variety of aquatic ecosystems. Coverage of topics associated with benthic algae and cyanobacteria, though not comprehensive, includes new methods, taxa new to science, nutrient dynamics, trophic interactions, herbicides and other pollutants, metal contaminants, nuisance, bloom-forming and harmful algae, bioassessment, and bioremediation. Coverage of bacteria, also not comprehensive, focused on methylation of mercury, metal contamination, toxins, and other environmental pollutants, including oil, as well as the use of benthic bacteria as bioindicators, in bioassessment tools and in biomonitoring. Additionally, we cover trends in recent and emerging topics on substratum-associated microbiota of relevance to the Water Environment Federation.
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