scholarly journals Structure of poaching sturgeon species in the Irtysh River in 2013-2020 (according to ichthyologic examinations)

2021 ◽  
Vol 0 (4) ◽  
pp. 17-23
Author(s):  
Andrey Aleksandrovich Chemagin
Keyword(s):  
Weight Ratio ◽  
Growth Dynamics ◽  
Siberian Sturgeon ◽  
Average Weight ◽  
Positive Trend ◽  
Average Mass ◽  
Average Value ◽  
Sturgeon Species ◽  
Irtysh River ◽  
The Irtysh River

The study was carried out on the basis of the analysis of poaching sturgeon species in the lower reaches of the Irtysh River (the Tyumen region and Khanty-Mansi Autonomous Okrug), according to the results of forensic ichthyologic examinations over the period from 2013 to 2020. The size and weight ratio of Siberian sturgeon and sterlet in catches, the average weight of one fish species, the number of examinations performed, as well as the dynamics of these indicators for the considered time period were evaluated. As a result of the analysis performed, there has been seen an upward trend in the number of expert examinations (from 10 in 2013 to 25 in 2020). Among sturgeon species sterlet dominates in size, with the exception the period of 2017-2018. There has been stated the dynamics of increasing mass of Siberian sturgeon and, accordingly, a decrease for sterlet, with the average share of sturgeon to be less 50%. The average mass of a Siberian sturgeon species has increased from 0.8 to 1.2 kg, as well as a positive trend for the above period is noted when analyzing the total mass of sturgeon species during yearly examinations. Body mass of poached sterlet species hasn’t increased over the 8-year period, and its average value made 0.11–0.13 kg. Over the investigated period the number of forensic ichthyologic examinations has increased, the average mass growth dynamics in a Siberian sturgeon species has been stated, with predominating of immature species in both of sterlet and Siberian sturgeon catches.

scholarly journals CHARACTERISTIC OF HARD TO IDENTIFY GENUS ACIPENSER SPECIES IN THE IRTYSH RIVER

2018 ◽  
pp. 90-98 ◽  
Author(s):  
Andrey Stepanovich Aldokhin ◽  
Gleb Igorevich Volosnikov
Keyword(s):  
Water Area ◽  
Bone Plates ◽  
Similar Species ◽  
Summer Period ◽  
Sturgeon Species ◽  
Irtysh River ◽  
June July ◽  
The Irtysh River

In the summer period (June-July) of 2018 on the Irtysh river (the Tobolsk region) in the control catches of sterlet there were found specimens with pronounced differences from individuals inhabiting this water area. Differences were found in the form of bone plates and linear-weight characteristics. Later, local fishermen reported on many cases of specimens having the above differences. Reports about the similar species came from the Uvat region. In order to establish the belonging of these individuals to a particular family there have been investigated meristic features which are considered diagnostic for sturgeon species, as well as for hybrids. In the result of the study there was made a conclusion about belonging of these specimens to the genus Acipenser and, most likely, to the sterlet species.

scholarly journals Chromosome Distribution of Highly Conserved Tandemly Arranged Repetitive DNAs in the Siberian Sturgeon (Acipenser baerii)

Genes ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 1375
Author(s):  
Larisa S. Biltueva ◽  
Dmitry Yu. Prokopov ◽  
Svetlana A. Romanenko ◽  
Elena A. Interesova ◽  
Manfred Schartl ◽  
...  
Keyword(s):  
Duplication Event ◽  
Siberian Sturgeon ◽  
Genome Duplication Event ◽  
Acipenser Baerii ◽  
Whole Genome Duplications ◽  
Sturgeon Species ◽  
Genome Duplications ◽  
Size Groups ◽  
Genomic Studies ◽  
Syntenic Regions

Polyploid genomes present a challenge for cytogenetic and genomic studies, due to the high number of similar size chromosomes and the simultaneous presence of hardly distinguishable paralogous elements. The karyotype of the Siberian sturgeon (Acipenser baerii) contains around 250 chromosomes and is remarkable for the presence of paralogs from two rounds of whole-genome duplications (WGD). In this study, we applied the sterlet-derived acipenserid satDNA-based whole chromosome-specific probes to analyze the Siberian sturgeon karyotype. We demonstrate that the last genome duplication event in the Siberian sturgeon was accompanied by the simultaneous expansion of several repetitive DNA families. Some of the repetitive probes serve as good cytogenetic markers distinguishing paralogous chromosomes and detecting ancestral syntenic regions, which underwent fusions and fissions. The tendency of minisatellite specificity for chromosome size groups previously observed in the sterlet genome is also visible in the Siberian sturgeon. We provide an initial physical chromosome map of the Siberian sturgeon genome supported by molecular markers. The application of these data will facilitate genomic studies in other recent polyploid sturgeon species.

Study of feed quality and biological indicators of varietal feeding of newly created different ploidy mulberry varieties

2021 ◽  
Vol 68 (07) ◽  
pp. 7-11
Author(s):  
Mahir Həmzə oğlu Hacıyev ◽  
◽  
Vəfa İbrahim qızı Məhərrəmova ◽  
Keyword(s):  
Biological Indicators ◽  
Average Weight ◽  
Biological Parameters ◽  
Average Mass ◽  
Feed Quality ◽  
Leaf Yield ◽  
New Varieties

The article clarifies the effect of the leaves of various newly created ploidy mulberry varieties on the productivity of mulberry silkworms, as well as on the biological parameters of silkworms. New varieties are described by conducting varietal feeding to determine the feed quality of varieties by providing information on leaf yield and the leaf yield of newly created varieties, by studying the biological parameters of varietal feeding, by determining the average mass of alive cocoons, silkness%, cocoon yield. Keywords: mulberry, sort, leaf yield, silkiness, viability, average weight of cocoon, cocoon product

A stonefly species extinct in Europe (Taeniopteryx araneoides Klapalek, 1902, Taeniopterygidae, Plecoptera) is thriving in the Irtysh River in West Siberia and North Kazakhstan

Zootaxa ◽  
2017 ◽  
Vol 4247 (2) ◽  
pp. 141 ◽  
Author(s):  
OLEG E. KOSTERIN ◽  
NAZYMGUL AKIMBEKOVA ◽  
VLADIMIR V. DUBATOLOV ◽  
IGNAC SIVEC
Keyword(s):  
Anthropogenic Impacts ◽  
West Siberia ◽  
Large Rivers ◽  
Geographical Range ◽  
Central Siberia ◽  
Irtysh River ◽  
The Irtysh River

Taeniopteryx araneoides Klápalek, 1902, a stonefly species with brachypterous males, known historically from the Danube, Elbe, and Dniester rivers, but considered to be extinct at least in Europe for more than a century. This species has also been doubtfully reported from Krasnoyarsk, Central Siberia. However, we report this species to be still thriving in the Irtysh River at the cities of Omsk (West Siberia, Russia) and Pavlodar (North Kazakhstan). The occurrence of this species reported least fifty years ago from the Yenisey River at Krasnoyarsk, Russia is considered possible. Unlike the widespread Palaearctic T. nebulosa (Linnaeus, 1758) that occurs in a broad range of stream types, T. araneoides is a potomon species, apparently confined to large rivers. In this habitat, it appears vulnerable to anthropogenic impacts and may be unable to compete with T. nebulosa. The construction of dams and reservoirs has apparently extirpated T. araneoides from most of its former geographical range. 

scholarly journals Attempt to Define the Complexes of Bat Ectoparasites in the Boreal Palaearctic Region / Попытка выделения комплексов эктопаразитов летучих мышей бореальной Палеарктики

2015 ◽  
Vol 49 (1) ◽  
pp. 75-86 ◽  
Author(s):  
M. V. Orlova ◽  
O. L. Orlov
Keyword(s):  
Far East ◽  
Palaearctic Region ◽  
Taiga Zone ◽  
The West ◽  
Bat Flies ◽  
The Family ◽  
Gamasid Mites ◽  
Faunal Complexes ◽  
Irtysh River ◽  
The Irtysh River

Abstract The article presents the most complete data on the distribution of ectoparasites in the boreal Palaearctics (gamasid mites of the genera Spinturnix, Macronyssus, and Steatonyssus, bat flies of the family Nycteribiidae, fleas of the family Ischnopsyllidae) and its preferences for the hosts. On the basis of these data as well as the data for the resettlement of bats in Eurasia 30 species of boreal bat ectoparasites combined into three faunal complexes (Transpalaearctic, European-Ural and Siberian-Far East) and two groups (European-Ural species, penetrating to the east and Siberian-Far East, penetrating to the west). The boundary between the European-Ural and Siberian-Far East faunal complexes is situated presumably along the Irtysh River. The resulting zoning provides a new look at the parasitocenosis of ectoparasites in the taiga zone of the Palaearctics.

scholarly journals Modeling Snow Depth and Snow Water Equivalent Distribution and Variation Characteristics in the Irtysh River Basin, China

2021 ◽  
Vol 11 (18) ◽  
pp. 8365
Author(s):  
Liming Gao ◽  
Lele Zhang ◽  
Yongping Shen ◽  
Yaonan Zhang ◽  
Minghao Ai ◽  
...  
Keyword(s):  
Snow Cover ◽  
River Basin ◽  
Snow Depth ◽  
Snow Water Equivalent ◽  
Snow Accumulation ◽  
Implicit Scheme ◽  
Snow Water ◽  
Irtysh River ◽  
Simulation Results ◽  
The Irtysh River

Accurate simulation of snow cover process is of great significance to the study of climate change and the water cycle. In our study, the China Meteorological Forcing Dataset (CMFD) and ERA-Interim were used as driving data to simulate the dynamic changes in snow depth and snow water equivalent (SWE) in the Irtysh River Basin from 2000 to 2018 using the Noah-MP land surface model, and the simulation results were compared with the gridded dataset of snow depth at Chinese meteorological stations (GDSD), the long-term series of daily snow depth dataset in China (LSD), and China’s daily snow depth and snow water equivalent products (CSS). Before the simulation, we compared the combinations of four parameterizations schemes of Noah-MP model at the Kuwei site. The results show that the rainfall and snowfall (SNF) scheme mainly affects the snow accumulation process, while the surface layer drag coefficient (SFC), snow/soil temperature time (STC), and snow surface albedo (ALB) schemes mainly affect the melting process. The effect of STC on the simulation results was much higher than the other three schemes; when STC uses a fully implicit scheme, the error of simulated snow depth and snow water equivalent is much greater than that of a semi-implicit scheme. At the basin scale, the accuracy of snow depth modeled by using CMFD and ERA-Interim is higher than LSD and CSS snow depth based on microwave remote sensing. In years with high snow cover, LSD and CSS snow depth data are seriously underestimated. According to the results of model simulation, it is concluded that the snow depth and snow water equivalent in the north of the basin are higher than those in the south. The average snow depth, snow water equivalent, snow days, and the start time of snow accumulation (STSA) in the basin did not change significantly during the study period, but the end time of snow melting was significantly advanced.

scholarly journals Chemical and environmental assessment of the bottom sediments in the Irtysh River (Tyumen Region, Russian Federation)

Vestnik MGTU ◽  
2019 ◽  
Vol 22 (1) ◽  
pp. 177-187
Author(s):  
E. S. Zemtsova ◽  
◽  
G. S. Alimova ◽  
A. Yu. Tokareva ◽  
◽  
...  
Keyword(s):  
Russian Federation ◽  
Bottom Sediments ◽  
Environmental Assessment ◽  
Irtysh River ◽  
The Irtysh River

scholarly journals Morphology of an Early Oligocene beaver Propalaeocastor irtyshensis and the status of the genus Propalaeocastor

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3311 ◽  
Author(s):  
Lüzhou Li ◽  
Qiang Li ◽  
Xiaoyu Lu ◽  
Xijun Ni
Keyword(s):  
Global Climate Change ◽  
Global Climate ◽  
Dental Morphology ◽  
Late Oligocene ◽  
Morphological Comparison ◽  
Valid Genus ◽  
Early Oligocene ◽  
The Status ◽  
Irtysh River ◽  
The Irtysh River

The Early to Late Oligocene Propalaeocastor is the earliest known beaver genus from Eurasia. Although many species of this genus have been described, these species are defined based on very fragmentary specimens. Propalaeocastor irtyshensis from the Early Oligocene Irtysh River Formation in northwestern Xinjiang, China is one of the earliest-known members of Propalaeocastor. This species is defined on a single maxillary fragment. We revise the diagnosis of P. irtyshensis and the genus Propalaeocastor, based on newly discovered specimens from the Irtysh River Formation. The dental morphology of P. irtyshensis is very similar to other early castorids. The caudal palatine foramen of P. irtyshensis is situated in the maxillary-palatine suture. This is a feature generally accept as diagnostic character for the castorids. On the other hand, P. irtyshensis has two upper premolars, a rudimentarily developed sciuromorph-like zygomatic plate, and a relatively large protrogomorph-like infraorbital foramen. Some previous researchers suggested that Propalaeocastor is a junior synonym of Steneofiber, while other took it as a valid genus. Our morphological comparison and phylogenetic analysis suggest that Propalaeocastor differs from Steneofiber and is a valid genus. We also suggest that Agnotocastor aubekerovi, A. coloradensis, A. galushai, A. readingi, Oligotheriomys primus, and “Steneofiber aff. dehmi” should be referred to Propalaeocastor. Propalaeocastor is the earliest and most basal beaver. The origin place of Propalaeocastor and castorids is uncertain. The Early Oligocene radiation of castorids probably is propelled by the global climate change during the Eocene-Oligocene transition.

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