Antonova, E P

Belkin, V V

Fyodorov, F V

Ilyukha, V A

Khizhkin, E A

Kizhina, A G

Sergina, S N

Yakimova, A E

The repository of KarRC RAS

carried out every autumn according to Lavrov (1959). The figures in our text refer to the reserve territory only (without surrounding buffer zone).Over the past 10 years (2008-2017) in the reserve an average of 43 beavers per year lived in 12 settlements. Two peaks were noted: in 2009 there were 54 individuals in 12 settlements and in 2014-49 individuals in 13 settlements. There was 1 minimum (2013, 34 beavers, 11 settlements). Droughts o f 2010 and 2015 practically did not affect the course o f numbers. Small amplitude o f number fluctuations, a smooth decline in population, a sharp rise and a 6-year cyclical period are close to the predictions o f the mathematical model (Petrosyan et al., 2016).After a minimum of 2013 there was a change in the beaver distribution in the reserve. In 2009-2012 there was an average o f 38 beavers a year in the basin o f the Tadenka, in 2014-2015-26. In Ponikovka, on the contrary, growth was registered: 4 and 11 beavers, respectively. As a result, the percent o f number o f Tadenka Basin beavers from their total number in the reserve decreased from 82 % to 62 %. The growth of the role o f the Ponikovka beaver population is connected by events only in this river (changes in the water regime and the restructuring o f the population structure).Supported by the program o f the Presidium RAS No. I.21PADAPTATION OF SEMIAQUATIC RODENTS (RODENTIA)TO CONDITIONS OF HYPOXIA/REOXYGENATIONE. P. Antonova, S. N. Sergina, V. A. Ilyukha, A. G. Kizhina,E. A. Khizhkin, A. E. Yakimova, V. V. Belkin, F. V. FyodorovInstitute o f  Biology, Karelian Research Centre,Russian Academy o f  SciencesAdapted to oxygen deficiency, semiaquatic mammals can serve as a convenient model for studying the processes o f hypoxia and reoxygenation. Both oxygen deficiency and its increased intake directly after diving can lead to enhanced generation of reactive oxygen speciesDYNAMICS OF GAME AN IM ALS POPULATIONS IN NORTHERN EUROPE7th In te rn a t io n a l sym posium  2 4 -2 8  Septem ber 2018138DYNAMICS OF GAME AN IM ALS POPULATIONS IN NORTHERN EUROPE7th In te rn a t io n a l sym posium  2 4 -2 8  Sep tem ber 2018(ROS) and therefore to imbalance between the formation of oxygen radicals and antioxidant protection. The antioxidant system is involved in maintaining ROS at the stationary level, and lactate dehydrogenase (LDH) and its isoenzymes play a role in the adaptive changes in the energy o f the organism.The aim of this study was to analyze the antioxidant status and the distribution of LDH isoenzymes and its total activity in tissues of rodents. The objects of the research were semiaquatic European beaver (Castor fiber), muskrat (Ondatra zibethicus) and water vole (Arvicola amphibius). Samples o f Wistar rat (Rattus norvegicus) tissues were used for comparison.As a result o f the study, it was revealed that the closely related species o f rodents formed species-specific features o f adaptation to hypoxia/ reoxygenation in the course o f evolution. Like marine mammals, semiaquatic rodents, in comparison with terrestrial species, are characterized by the increased activity o f antioxidant enzymes mediated indirectly in redox signaling processes. Our results demonstrate that the enhanced utilization o f circulating lactate loads as the adaptation for recovery from a diving period is achieved through either involving most o f the examined tissues (heart, kidney, lung and spleen) in this process as in the case o f beaver, or increasing LDH activity in tissues (heart, liver and skeletal muscle) as in the case o f muskrat.Thus, the observed differences between the studied parameters in semiaquatic and terrestrial rodent species should probably be considered as a reflection o f the evolutionarily developed needs o f the organism, which ensure a high efficiency o f the functioning of metabolic systems.The research was carried out under state order (projects № 0221-2017­0046 and 0221-2017-0052) using the equipment o f  the Core Facility o f  the Karelian Research Centre o f  the Russian Academy o f  Sciences”.139

Adaptation of Semiaquatic Rodents (Rodentia) to Conditions of Hypoxia/Reoxygenation

http://elibrary.krc.karelia.ru/677/1/%D0%94%D0%98%D0%9D%D0%90%D0%9C%D0%98%D0%9A%D0%90%20%D0%9F%D0%9E%D0%9F%D0%A3%D0%9B%D0%AF%D0%A6%D0%98%D0%99_2018_138.pdf

Adaptation of Semiaquatic Rodents (Rodentia) to Conditions of Hypoxia/Reoxygenation

Abstract

Similar works

Full text

Available Versions

The repository of KarRC RAS