MINERALIZATION OF SMALL RIVERS WATER IN THE AMUR REGION

The authors have considered mineralization of small rivers water in the Russian part of the Amur basin. The lowest values are observed in water of the rivers, draining intrusions; the highest ones – in the rivers of the areas with ore occurrences and deposits of polymetals, karst development and mineral water outlets. The maximum salinity is characteristic of the river waters in the urbanized territories.

EXPANSION OF THE ARCTOGEIC ELEMENT OF FLORA INTO THE BOREAL REGION (ON THE EXAMPLE OF OKHOTIA)

On the example of arctic and arctoalpine species of the sedge family (Cyperaceae Juss.), willow family (Salicaea Mirb.), saxifrage family (Saxifragaceae Juss.), buttercup family (Ranunculaceae Juss.) and rose family (Rosaceae Juss.) new points of their settlement in the subarctic mountain structures of Priokhotye are shown. The ecological adaptations of arctogenic element species to existence in mountainous conditions of low temperatures and high water content of habitats (nival lawns, the outskirts of ice crust fields, key bogs, etc.) are considered. This made it possible to clarify the main ways of arctic and arctic-alpine species dispersal in the subarctic mountain systems of the Boreal region.

SPATIAL PATTERNS IN POPULATIONS WITH TWO AGE GROUPS: SPATIAL-TEMPORAL CHAOS, CHIMERS, AND SOLITARY STATES

The article studies the conditions for the emergence of various types of inhomogeneous spatial distribution that arise in the model of populations with two age groups living in an extended two-dimensional area. The author proposes several quantitative indicators to identify the regular (clusters of synchronous populations in the form of spots, stripes or labyrinths) and the irregular (chimeras, solitary states and space-time chaos) spatial structures.

MODEL OF TERRITORIAL PUBLIC SELF-GOVERNNANCE IN BIROBIDZHAN AND ITS DISTINCTIVE FEATURES

The body of theoretic, scientific and research materials on territorial public self-governance (TPS) and its actual state in Russia is quite impressive today. The specific practices are broadly disseminated in the cities of Perm, Yaroslavl, Dzerzhinsk, Novosibirsk, Tomsk, Ulan-Ude, etc. Many scientific works consider legal, public and political nature of this unique municipal people’s democracy institution. Nevertheless, there are no. so many methodological publications providing a deeper insight into the system of various TPS practices. In Birobidzhan, the TPS activities are based on functional trilateral cooperation of the Local Residents, TPS Bodies and Local Self-Governance Authorities. The author of this article has attempted to briefly systematize the unique TPS features of Birobidzhan and justify the existence of the specific Birobidzhan TPS Model, which is already known as the «Three-D-TPS».

INTRA-ANNUAL DYNAMICS OF MORTALITY RATES IN CITIES OF THE SOUTHERN PART OF THE RUSSIAN FAR EAST

The analysis of the intra-annual dynamics of mortality rates features from all causes and from cardiorespiratory diseases, using the seasonality index, showed the maximum mortality rate in cities of the Far East south in winter, and the minimum-in summer. A detailed analysis of mortality caused by cardiorespiratory diseases in the older age cohort has revealed a higher risk of pathologies in winter periods, with a maximum in February. A relative indicator decline in November, apparently associated with the so-called «harvest effect», when excess mortality in one period (in October) is compensated by the indicator decrease in the subsequent time period. For the elderly population in Khabarovsk, the maximum death rate in January and its sharp rise in October repeats the picture of all-cause mortality with little gender difference. For men – residents of Vladivostok-the maximum development of cardiovascular disasters occurs in January, a slight increase in mortality is observed in May and October, and the minimum-in August and September, with an annual dynamics with an amplitude of 20%.

DAY-TO-DAY CHANGES IN AIR TEMPERATURE IN THE SOUTHERN PART OF THE RUSSIAN FAR EAST

Day-to-day changes in air temperature for cities in the southern part of the Russian Far East experience a noticeable annual dynamics with its maximum in winter and minimum values in summer, and a noticeable increase in May as compared to neighboring months. The summer minimum in Vladivostok is slightly smaller than in Khabarovsk, and these values are two times less than maximum values in winter. The cold period maximum is most pronounced in Vladivostok from November to February. In Khabarovsk, the maximum critical temperature changes (more than 5°(C) are observed during the winter period in December and January; the fewest such days are in August. A sharp shift in temperatures is typical for the transition period from September to October, when the number of days with a significant change in the inter-day temperature is tripled. The off-season critical temperature changes dynamics in Vladivostok is the same, but the absolute value of the maxima is twice as high as in Khabarovsk. This is due to the maritime climate of Vladivostok, active cyclonic activity, accompanied by constant temperature changes in winter.

THE TYRMINSKY URANIUM REGION AS A PROBABLE BASE FOR THE URANIUM INDUSTRY IN THE FAR EAST

The authors show that the Far Eastern Tyrminsky uranium region, poorly studied to a depth of 80–150m from the surface, has much in common with the Streltsovsky super-large uranium region, which has been working out for 50 years to a depth of 1 km from the surface. Therefore, after exploration of the region to a depth of 500 m, it could become a likely base for the uranium industry in the Far East.

INTERANNUAL DYNAMICS OF PLANKTON COMMUNITIES IN THE CHANNEL SECTIONS OF THE KUIBYSHEV RESERVOIR

Based on the materials of hydro-biological studies in the Volga part of the Kuibyshev reservoir in 2018 and 2019, the authors evaluated changes in the quantitative indicators and taxonomic composition of phytoplankton and zooplankton. According to the results of the study, it was revealed that in 2019 the taxonomic diversity increased, but the abundance and biomass indices of phytoplankton decreased, while zooplankton decreased only in its abundance.

NYMPHOMYIIDAE (DIPTERA) OF THE AMUR RIVER BASIN

The authors present the data on distribution, biology and ecology of the archaic Diptera Nymphomyiidae in the Amur River basin.

EFFECT OF AGE STRUCTURE AND MATERNAL SELECTION IN POLYMORPHISM MAINTENANCE ON LONG-LIVED SPECIES UNDER A CYCLICALLY CHANGING ENVIRONMENT

Maternal selection and overlapping generations can facilitate stable coexistence of alleles under temporally fluctuating environment. The work studies a complex effect of both factors under asymmetric cyclic selection, which simulates environment fluctuation by analogy of food resources cycles with rare peaks and prolonged decline of prey abundance. Our modeling intends to describe a situation demonstrated by the community of “arctic foxes – mouse-like rodents” and explain maintaining polymorphism on litter size in arctic fox.