Tatyana Mayor

• PhD
• PhD at Limnological Institute of Siberian Branch of the Russian Academy of Sciences

Eucyclops speratus (Lilljeborg, 1901) (Copepoda, Cyclopoida, Cyclopidae) was studied using various methods. Molecular genetic methods (comparison of COI and ITSn molecular markers) have shown that this species represents a species complex, and the following methods were used to search for differences between the species: analysis of qualitative and...

Based on new material, an illustrated redescription of the female and male of one of the rare species of harpacticoids endemic to Baikal, Canthocamptus (Baikalocamptus) verestschagini (Borutzky, 1931) is given. Since the type series are lost, we have identified a neotype. For the first time, the morphology of this species was studied in detail usin...

The genus Eucyclops is the most species-rich within the subfamily Eucyclopinae. Despite the significant research of Eucyclops in Russia, there are still vast areas including Siberia, the Baikal region, and the Far East with fragmentary study of this genus, particular with regard to molecular methods. In this work we have sequenced four molecular ma...

Ancient lakes are hotspots of species diversity, posing challenges and opportunities for exploration of the dynamics of endemic diversification. Lake Baikal in Siberia, the oldest lake in the world, hosts a particularly rich crustacean fauna, including the largest known species flock of harpacticoid copepods with some 70 species. Here, we focused o...

A new species, Diacyclops dyabdar sp. nov. from the Diacyclops crassicaudis (Sars, 1863) species group from northern Middle Siberia, is described. This species is interesting from an ecological point of view, as it lives mainly in watercourses. It is well-distinguished from other species of the group by the presence of spinules on the first segment...

Cyclopoids are an extremely diverse and abundant group of arthropods found in Lake Baikal. Diacyclops Kiefer, 1927 is the most species-rich and highly endemic genus among them. The morphological characteristics of the three Baikal species, D. improcerus, D. galbinus and D. versutus, show considerable differences. Therefore, it is worth considering...

The results of studies of the morphology and genetics of the Baikal subendemic ( Harpacticella inopinata Sars, 1908 harpacticoid) are presented. The collections of 1969 and 2017–2022 from the southern part of Lake Baikal and the Yenisei River within the city of Krasnoyarsk are used as material. It is demonstrated that morphological variability with...

The work presents the results of comparative studies of the morphology and genetics of the Baikal subendemic – the harpacticoid copepod Harpacticella inopinata Sars, 1908. The material was obtained from the southern part of Baikal Lake and the Yenisei River within the of Krasnoyarsk city in 1969, 2017–2022. It is shown that morphological variabilit...

The larvae of the genus Chironomus are a common object for hydrobiological studies, as well as a model object for cytogenetics. Morphologically, the species are very similar. One of these species or species complex is Chironomus “annularius”, which has a Holarctic distribution. It has chromosomal banding sequences characteristic of Nearctic and Pal...

Temperature adaptations of ectothermic species as well as the plasticity of their thermal strategies are important for survival during temperature fluctuations, in particular, caused by global warming. The critical thermal maximum (CTM)-the values of the water temperature at which heat shock was noted (loss of motor activity in case of copepods) wa...

A redescription of the Lake Baikal endemic species, Canthocamptus (Baicalocamptus) longifurcatus Borutzky, 1947 (Harpacticoida: Canthocamptidae), is provided. The illustrated redescription of morphology of the female and male is supplemented by a genetic barcoding based on sequences of the mitochondrial COI marker. Canthocamptus (B.) longifurcatus...

We studied the population structure of the Cyclops kolensis.Lill, 1901 copepod in Lake Baikal. For analysis, we used the fragment sequences of the cytochrome oxidase subunit 1 (CO1) of mitochondrial DNA. Based on these sequences, we constructed a haplotype tree for Baikal individuals as well as a phylogenetic tree for the sequences of Baikal and no...

In this study, morphological and molecular analyzes of one phylogenetic group (VIG2) in the complex of Baikal cyclopoids that are similar in morphology to Diacyclops versutus, D. improcerus and D. galbinus are performed. The first internal transcribed spacer (ITS1) and the mitochondrial cytochrome c oxidase subunit I (COI) were chosen as molecular...

Lake Baikal is inhabited by a relatively large number of cyclopid species, many of which are endemics. Two genera, Diacyclops Kiefer, 1927 and Acanthocyclops Kiefer, 1927, are the most specious in the lake. Taxonomic discrimination of the majority of representatives of these genera is difficult owing to their high morphological similarities and poo...

Проведен молекулярно-филогенетический анализ представителей группы Diacyclops/Acanthocyclops, обитающих в Байкале. В качестве эволюционного маркера использовали фрагмент гена первой субъединицы цитохромоксидазы митохондриальной ДНК (COI). В ходе исследования показана эффективность использования фрагментa гена СOI (ок. 1000 пн) для сравнения байкаль...

The value of chromatin diminution (CD) in different species of freshwater cyclopoid copepods can differ significantly. The biological and evolutionary roles of these differences remain unclear. To expand the knowledge on CD distribution and magnitude in this group of copepods, a quick method for its evaluation was required. This study proposes a si...

The population structure of Epischura baicalensis Sars (Copepoda, Calanoida), one of the key endemic species of the plankton community of Lake Baikal was studied. An analysis of mitochondrial DNA polymorphism revealed no genetic differences between Epischura sampled in the different basins of the lake or in the winter-spring/summer generations. Bai...

Baikalian cyclopoids represent one of the richest endemic faunas of freshwater cyclopoid copepods. The genus Diacyclops Kiefer, 1927 is the most numerous by species number in the lake. In this work, molecular-phylogenetic analysis of 14 species and 1 sub-species from Lake Baikal and its water catchment basin is performed. The regions of mitochondri...