scholarly journals Stylostome of the trombiculid mite larvae Neotrombicula talmiensis (Schluger, 1955) (Acariformes, Trombiculidae) feeding on two host species in the Russian Far East

Acarologia ◽  
2021 ◽  
Vol 61 (2) ◽  
pp. 412-431
Author(s):  
Andrey B. Shatrov ◽  
Anastasia A. Antonovskaia
Keyword(s):  
Host Species ◽  
Russian Far East ◽  
Far East ◽  
Feeding Tube ◽  
Larval Feeding ◽  
Trombiculid Mite ◽  
Tamias Sibiricus ◽  
Species Specific ◽  
Myodes Rufocanus ◽  
Neutrophil Leukocytes

Stylostome and skin inflammatory reaction during feeding of Neotrombicula talmiensis (Schluger, 1955) (Acariformes, Trombiculidae) larvae on the naturally infected host animals – voles Myodes rufocanus Sundevall, 1846 and Asian chipmunk Tamias sibiricus (Laxmann, 1769) were studied by histological methods. In addition, larvae were studied in scanning electron microscope (SEM). The apical hypostomal portions form a temporal sucker, which applies to the host skin during feeding. Larval feeding on both naturally infected voles and chipmunks causes an epidermal hyperkeratosis and a permanent delayed inflammation with predominance of neutrophil leukocytes, dilation of dermal capillaries and local hemorrhages. Larvae tend to feed in tight groups and may attach themselves to both ‘living’ epidermis and hypertrophic stratum corneum. The stylostome is organized nearly identically in the two host species, which points to the species-specific character of the feeding tube in trombiculid larvae. The stylostome does not penetrate the epidermis through, so it may be classified as belonging to the epidermal type. The stylostome is produced by a solidifying larval secretion and composed of the proximal eosinophil cone and the main stylostome tube, both pale-pink in azure-II-eosin with a greyish peripheral portion more pronounced in voles. No longitudinal and transverse stratification is found in the stylostome composition. In contrast with other trombiculid larvae studied so far, larvae of N. talmiensis also ingest, besides liquefied nutrients, a pure blood that reveals a possibility for trombiculid larvae to be natural bloodsuckers.

Halecania ahtii (Leprocaulaceae), a new lichen species from the Russian Far East

2020 ◽  
Vol 54 (2) ◽  
pp. 405-411
Author(s):  
I. S. Zhdanov
Keyword(s):  
New Species ◽  
Host Species ◽  
Russian Far East ◽  
Far East ◽  
Lichen Species ◽  
Type Locality ◽  
A New Species ◽  
The Russian Far East

A new species, Halecania ahtii, is described and illustrated. It is only known from the type locality in the Russian Far East. It is characterized by thin, very inconspicuous thallus consisting of small, dispersed areoles and most likely containing argopsin (identified by fast orange-red reaction with P), as well as relatively small ascospores, and a lichenicolous habit on different saxicolous host species on acidic rocks. A key for Halecania species containing argopsin is proposed.

Parasite diversity at the Holarctic nexus: species of Arostrilepis (Eucestoda: Hymenolepididae) in voles and lemmings (Cricetidae: Arvicolinae) from greater Beringia

Zootaxa ◽  
2013 ◽  
Vol 3608 (6) ◽  
pp. 401-439 ◽  
Author(s):  
ARSENY A. MAKARIKOV ◽  
KURT E. GALBREATH ◽  
ERIC P. HOBERG
Keyword(s):  
Russian Far East ◽  
Far East ◽  
Rodent Host ◽  
North Central ◽  
Morphological Attributes ◽  
Pattern Shape ◽  
Holarctic Region ◽  
The Republic ◽  
Myodes Rufocanus

Previously unrecognized species of hymenolepidid cestodes attributable to Arostrilepis Mas-Coma & Tenora, 1997 in arvicoline rodents from the greater Beringian region and western North America are described. Discovery and characterization of these tapeworms contributes to the recognition of a complex of cryptic species distributed across the Holarctic region. Three species are proposed: Arostrilepis gulyaevi sp. n. is named for cestodes in Myodes rufocanus from the Republic of Buryatia, southeastern Siberia and from the Khabarovskiy Kray, Chukotka Autonomous Okrug, and Magadanskaya Oblast’, Russian Far East (western Beringia); A. cooki sp. n. is named for cestodes in Myodes gapperi from British Columbia, Canada and Montana, USA; and A. rauschorum sp. n. is named for cestodes in Microtus oeconomus, M. longicaudus, M. pennsylvanicus and M. xanthognathus from the Brooks Range, Seward Peninsula, north-central interior, and Arctic coastal plains of Alaska (eastern Beringia) and Montana, USA. Consistent with recent studies defining diversity in the genus, the form, size, and spination (pattern, shape and size) of the cirrus are diagnostic; species are further distinguished by the relative position and length of the cirrus sac, and arrangement of the testes. Assessment of genetic data from the cytochrome b gene of mitochondrial DNA complements differentiation of this complex based on morphological attributes and confirms known species diversity within the genus. New data for geographical distribution and host specificity of known Arostrilepis spp. indicate that 3 of 12 recognized species have Holarctic distributions extending across Beringia. These include Arostrilepis beringiensis (Kontrimavichus & Smirnova, 1991) in lemmings (species of Lemmus and Synaptomys), A. cf. janickii Makarikov & Kontrimavichus, 2011 in root voles (M. oeconomus) MAKARIKOV ET AL. 402 · Zootaxa 3608 (6) © 2013 Magnolia Press and A. macrocirrosa Makarikov, Gulyaev & Kontrimavichus, 2011 in red backed voles (species of Myodes) and less often other rodent host species.

Selection of the Area of Window Openings of Residential Buildings in Conditions of Monsoon Climate of the Far East of the Russian Federation and Northern Areas of China

2019 ◽  
pp. 27-33
Author(s):  
Aleksei K. Solovyov ◽  
Bi Guofu
Keyword(s):  
Residential Buildings ◽  
Russian Far East ◽  
Far East ◽  
Heat Losses ◽  
Natural Light ◽  
Monsoon Climate ◽  
Northern Areas ◽  
Artificial Illumination ◽  
Heat Penetration ◽  
Large Heat

The term “window” in architecture usually stands for an opening in a wall or roof for penetration of natural light, sunrays and fresh air in premises. Recently, the requirement of contact with environment is added to this condition. It is especially relevant for residential buildings where rooms are considered residential if they have windows. The energy consumption of a building depends on sizes, form and location of windows. In winter, windows cause huge heat losses, in summer, on the other hand, large heat enters a building via the windows and is required to be removed by means of air conditioning. Moreover, windows are used for penetration of natural light in premises, which assists in saving of large amounts of power for artificial illumination. This article discusses partial solving the problem of the energy efficiency of residential buildings by determining the most efficient area of windows in terms of energy spending for compensation of heat losses via windows in winter, elimination of heat penetration through them in summer and energy losses for artificial lighting throughout the year. The analysis of the results of calculation of power consumption for residential premises in conditions of monsoon climate of the Russian Far East and Northern areas of China (PRC) is provided.

Tax debt as a threat to the economic security of the Russian Far East

2020 ◽  
Vol 13 (2) ◽  
pp. 216-242
Author(s):  
V.A. Yakimova ◽  
A.A. Orekhova
Keyword(s):  
Russian Far East ◽  
Consumer Price Index ◽  
Far East ◽  
Federal District ◽  
Economic Security ◽  
Factors Affecting ◽  
Correlation And Regression Analysis ◽  
Debt Collection ◽  
Far Eastern ◽  
The Russian Far East

Subject. The article addresses the tax liabilities of taxpayers registered in the subjects of the Far Eastern Federal District, which should be paid to the consolidated budget of the Russian Federation, as well as the factors of the said debt growth. Objectives. Our aim is to assess the level of tax debt of regions of the Russian Far East and identify the correlation between the factors and the amount of tax debt. Methods. The study rests on methods of analysis, generalization, grouping, systematization, and the correlation and regression analysis. Results. We analyzed the level of tax debt for the entire Far Eastern Federal District and by region, identified factors affecting the growth of tax debt therein. The paper assesses the structure of tax debt by type of taxes and activity of debtors. The unveiled factors may help control changes in the size of tax debt in the Russian Far East and develop effective measures to improve the debt collection. Conclusions. The study shows that there is an increase in the tax debt in the regions of the Russian Far East, in the VAT in particular. The factor analysis revealed that the volume of sales of wholesale enterprises, investment in fixed capital, the consumer price index have the largest impact on the amount of tax debt.

New records and rare alien species in the flora of the Russian Far East

2018 ◽  
Vol 65 ◽  
pp. 89-102
Author(s):  
Z.V. Kozhevnikova ◽  
◽  
A.E. Kozhevnikov ◽  
Keyword(s):  
Alien Species ◽  
New Records ◽  
Russian Far East ◽  
Far East ◽  
The Russian Far East

New invasive species Acanthoscelides pallidipennis (Motschulsky, 1874) (Coleoptera: Bruchidae) in the fauna of the Russian Far East

2018 ◽  
Vol 360 ◽  
pp. 25-28 ◽  
Author(s):  
A.V. Kuprin ◽  
◽  
N.A. Kolyada ◽  
D.G. Kasatkin ◽  
◽  
...  
Keyword(s):  
Invasive Species ◽  
Russian Far East ◽  
Far East ◽  
The Russian Far East

ON CHROMOSOME NUMBERS IN THE GRASS FAMILY (POACEAE) IN RUSSIA, WITH SPECIAL ATTENTION TO THE FAR EAST

2020 ◽  
Vol 68 ◽  
pp. 29-64
Author(s):  
N.S. Probatova ◽  
Keyword(s):  
Chromosome Numbers ◽  
Russian Far East ◽  
Far East ◽  
Grass Species ◽  
Original Material ◽  
Mountain Regions ◽  
Grass Family ◽  
The Far East ◽  
The World ◽  
The Russian Far East

The paper summarizes information on chromosome numbers (CNs) of the Grass species (Poaceae) in the flora of Russian Federation, obtained on the original material, most part - from the Russian Far East (RFE). In some species the CNs are known in Russia or in the world only from RFE, in some – from one locality or few, or from one subregion of RFE. The grass species in RFE often occur in mountain regions and near seacoasts; some species are endemics, some were studied near the limits of their geographical distribution areas. The diversity of CNs, the special features of the CNs distribution in some grass groups are discussed. The alien species are abundant in RFE, and their CNs are also involved in the study. For karyologically polymorphous species further studies are needed.

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