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Olenev, G. V.

doi:10.1023/a:1020213709830

Cited by 38 publications

(5 citation statements)

References 4 publications

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“…This approach is similar to detecting various functional and physiological groups (FPG) within the population. There are usually three FPGs: the first one (FPG-1) includes individuals that overwintered, the second one (FPG-2) includes individuals born in the current year which do not reproduce in the year of birth, and the third one (FPG-3) comprises individuals born in the current year which reproduce in the current year (Olenev, 1991(Olenev, , 2002. Unfortunately, the lack of accurate data on the age of the animals makes it impossible to use FPGs.…”

Section: Methodsmentioning

confidence: 99%

The phenomenon of the shrinking size of bank vole (Myodes glareolus) in an anthropogenic environment (experience of 50 years of observations)

Мyakushko

2021

Biosys. divers.

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Fifty years of continuous monitoring of the bank vole population (Myodes glareolus Schreber, 1780) revealed the phenomenon of shrinking body size of individuals, manifesting in significant reduction in their regular size and mass parameters. Field observations were carried out in the Kaniv Nature Reserve (Cherkasy region, Ukraine) during the first half of summer every year. In the forest biotopes of the reserve, this species is dominant in the group of rodents. The research period covered various stages of the existence of the protected ecosystem. Its small area, location ina densely populated region of Ukraine and interaction with neighboring territories which are involved in economic activities have always caused anthropogenic pressure on the protected area. Its nature and intensity determined the changes in the protection regime and the loss of reserve status in 1951–1968. Later, the territory of the reserve experienced increasing technogenic pressure accompanied by radioactive contamination. In this work, to compare their characteristics, four complete cycles of the density dynamics of the bank vole population (from depression to depression) were selected, the duration of which was 4–5 years. The first three cycles correspond to qualitatively different periods in the existence of the ecosystem and the population of the studied species, and the last one corresponds to the relatively current situation. Over the recent 30 years, the size and mass parameters of individuals of bank voles have deсreased, - this phenomenon was called shrinking. The process was also observed to tend towards consistent increase in scale. Differentiated analysis shows that in different sex and functional groups of animals, the decrease in exterior parameters can reach 30.3%. Shrinking is especially notable in the group of adult females that are actively involved in reproduction (compared to the second cycle, considered as the control, the decrease in parameters among these is 33.2%). Juveniles of this sex lost 31.8% of their fatness. Besides, in the population of voles, the proportion of large-size individuals was significantly reduced. The group of animals that overwintered significantly reduced its representation, and its existing representatives had much smaller exterior parameters. The studies found that the shrinking process is stable over time, which does not allow it to be considered a random phenomenon or an artifact of research. This phenomenon has no correlation with the amount or availability of food. It occurs against the background of numerous changes in various aspects of population dynamics, which gives grounds to associate it with anthropogenic changes in the environment. Shrinking is believed to be realized through various mechanisms. Firstly, as a result of mortality, the largest individuals and reproducing females with the greatest energy needs disappear from the population, and secondly, the growth and weight gain of young animals is slower. As a result, decrease in the size and mass parameters of individuals reduces their specific energy needs and allows the population to bring their requirements in correspondance with the capability of the environment to support a certain number of resource consumers. An analogy was drawn with the Dehnel’s phenomenon, described for shrews of the Sorex genus, whose body size and weight decrease is an element of preparation for experiencing adverse winter conditions. Based on similar concepts, the shrinking of its elements can be considered as a specific population strategy to maintain the ecological balance.

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Section: Methodsmentioning

confidence: 99%

The phenomenon of the shrinking size of bank vole (Myodes glareolus) in an anthropogenic environment (experience of 50 years of observations)

Мyakushko

2021

Biosys. divers.

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“…We used the functional-ontogeny approach [4], as a methodological basis for analyzing age structure of population. This approach supposes to divide natural population into groups of individuals with the same functional status, i. e. with the uniform patterns of growth and/or maturation rate as well as whether they participate in reproduction (scheme of two alternative pathways of mouse-like rodents' ontogenetic development presented early [3].…”

Section: Functional-ontogeny Approachmentioning

confidence: 99%

East urals radioactive trace: Adaptive strategy of rodents’ population

Grigorkina

Olenev

2011

Radioprotection

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Abstract. Population of small rodents in radiocontaminated environment is compelled to include more energy-intensive way of maintenance its ability to live -increasing of the proportion of mature young of the year (first pathway of ontogeny). Their reproductive characteristics -actual fecundity was higher, whereas embryonic mortality and the proportion of females with embryonic losses were significantly lower compared with neighboring areas. Abundance of mice in the impact zone was higher, age cross was revealed, which improves the adaptive possibility of the population. Preconditions for acceleration of evolutionary transformations of a population are created, but this process is restrained by both the local configuration of the polluted territory and migration of murine rodents. As a consequence, the population decreases the probability that certain changes will be fixed and inherited in a series of generations. Chronic low-dose radiation (stress) can be considered as the mechanism of switching of life history of cyclomorphic mammals. Thus, ontogenetic multiversality of small mammals is an important mechanism of protection strategy of population and decreasing the damaging action on biota in radiocontaminated environment. Functional approach makes it possible to reduce errors in assessing the radiological consequences and hence, can provide a reliable methodological basis for organization of biological monitoring.

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“…Mean life span of these rodents is up to 6 years. Wood mice (Apodemus (Sylvaemus) uralensis Pallas, 1811), field mice (Apodemus agrarius Pallas, 1771) and northern red-backed voles (Clethrionomys rutilus Pallas, 1779) are terrestrial rodents with high migratory activity, which is exhibited all the year round; their life span ranges from 3-4 months to 1.5 years in dependence of the type of ontogeny [6], which represented in figure 1. The studied specimens were captured at the plots with different densities by 90 Sr soil contamination: for mole-voles −37 MBq/m 2 = 1000 Ci/km 2 , but for mice and northern red-backed voles -18.5 MBq/m 2 = 500 Ci/km 2 .…”

Section: Sampling and Analysismentioning

confidence: 99%

“…This work was conducted on the base of functional approach [6]. This approach supposes to divide natural population of mice and voles into groups of individuals with the same functional status, i.e.…”

Section: Two Types Of Mouse-like Rodents' Ontogeny (Fig 1)mentioning

confidence: 99%

Radioadaptation of rodents in the zone of local radioactive contamination (Kyshtim Accident, Russia): 50 years on

Grigorkina

Olenev

2009

Radioprotection

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Abstract.Results of radioecological investigations of rodents having different ecological specializationwood and field mice, northern red-backed voles and mole-voles to acute (laboratory experiment) and chronic (long-term inhabiting the East Ural Radioactive Trace -EURT) irradiation are summarized. These species are greatly distinguished by a way of life, a migratory activity, an average life span etc. Numerous immunological, hematological and cytogenetical disturbances were found in more radioresistant wood and field mice and northern red-backed voles inhabiting the EURT zone (density of soil pollution by 90 Sr − 18.5 MBq/m 2 = 500 Ci/km 2 ) as compared with the reference samples. On the contrary there were no pathological shifts in more radiosensitive mole-voles from the more radioactively contaminated site ( 90 Sr − 37 MBq/m 2 = 1000 Ci/km 2 ). The absorbed dozes during the life for the mole-voles from the EURT zone were significantly higher (in 30 times) than these ones for mice and voles. These data testify about the possibility of radioadaptation in a series of generations in mole-voles that developed due to their ecophysiological features and isolation of settlement in the radiocontaminated zone. Mice and voles form a flowing population and slip off the prolonged influence of a damaging factor, this circumstance prevents the development of radioadaptation.

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Cited by 38 publications

References 4 publications

The phenomenon of the shrinking size of bank vole (Myodes glareolus) in an anthropogenic environment (experience of 50 years of observations)

The phenomenon of the shrinking size of bank vole (Myodes glareolus) in an anthropogenic environment (experience of 50 years of observations)

East urals radioactive trace: Adaptive strategy of rodents’ population

Radioadaptation of rodents in the zone of local radioactive contamination (Kyshtim Accident, Russia): 50 years on

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