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Количество страниц: 10 с.
The aim of this research was to investigate the hibernation pattern of the Siberian chipmunk across a broad range of temperatures, to determine the optimal temperature for hibernation, and to assess their ability to hibernate in relatively low environmental temperatures. In late August, three chipmunks had thermochron temperature sensors (DS-1922L-F5) surgically implanted to monitor their body temperature. The hibernation cycles of four chipmunks were studied by altering the temperature in their nesting materials. When the animals were moved to an underground lab with a temperature of -4 °C, the difference between their body temperature and the surrounding temperature increased by nearly 8 °C, reaching 12 °C to 14 °C as the ambient temperature dropped further. The length of hypothermia periods decreased while the frequency of awakenings increased. The lowest recorded body temperature was at least 1 °C. The longest hypothermia durations occurred in chipmunks exposed to temperatures between -4 °C and 4 °C, lasting 226 to 283 hours (9.4 to 11.8 days). For two chipmunks hibernating at temperatures below -6 °C, the hypothermia intervals averaged 73 and 99 hours, while other individuals had intervals of 174 to 188 hours. The optimal hibernation temperature range for chipmunksin Yakutia is between -4 °C to -6 °C and +5 °C to +6 °C. Hibernation ceases at ambient temperatures above 12 °C to 14 °C. When temperatures drop below -6 °C to -10 °C, the hibernation rhythm changes, resulting in shorter hypothermia intervals,similar to those observed at higher positive temperatures. This research enhances our understanding of how relatively small mammals can hibernate in low ambient temperatures (down to -10 °C). The findings may also be relevant for comparative studies on the hibernation of other small winter-hibernating mammals, such as hamsters and dormice, weighing up to 100 grams.
Ануфриев, А. И.
Температура тела и ритмика спячки бурундука Eutamias sibiricus в различных диапазонах окружающих температур / А. И. Ануфриев, В. Ф. Ядрихинский ; Институт биологических проблем криолитозоны СО РАН, Арктический государственный агротехнологический университет // Природные ресурсы Арктики и Субарктики. - 2024. - N 4, Т. 29. - C. 618-627. - DOI: 10.31242/2618-9712-2024-29-4-618-627
DOI: 10.31242/2618-9712-2024-29-4-618-627
Количество страниц: 11 с.
Changes in the fatty acid composition of phospholipids in buds during the winter-spring period (January-May) were studied in silver birch (Betula pendula Roth) growing in Karelia and Yakutia. Phospholipids were isolated from total lipids using column chromatography, while fatty acids were separated through gas chromatography. The metrics for acyl-lipid desaturase activity were represented by the ratios of stearoyl- (SDR), oleoyl- (ODR), and linoleoyl- (LDR) desaturases. Our findings demonstrate that, regardless of geographical location, the predominant phospholipid fraction during the development of primordia within the bud consists of unsaturated fatty acids. During the period of exogenous bud dormancy, dienoic acids were the most prevalent; however, their share declined by the onset of the growing season, while the proportion of trienoic acids increased. These changes were accompanied by a slight rise in the double bond index. Conversely, the unsaturation index nearly doubled by March, with this change being particularly pronounced in Yakutia. Simultaneously, the SDR and ODR values were high, indirectly indicating the active involvement of ω9 and ω6 desaturases in maintaining the liquid-crystalline state of phospholipids. The LDR value in phospholipids was the lowest, yet it nearly tripled by the onset of the growing season in both Karelia and Yakutia. We hypothesize that the liquid state of phospholipids in the cell membranes of meristematic tissue in the buds of silver birch growing in Karelia and Yakutia during the winter-spring period is sustained by high desaturase activity, with the most significant response to temperature changes observed in acyl-lipid ω3 desaturase. Furthermore, through the course of evolution, silver birch in Yakutia has developed an additional mechanism that involves a pronounced reduction in cell and tissue water content, which also contributes to maintaining an ordered state of phospholipids and their functions, particularly when exposed to extremely low air temperatures and permafrost.
Жирнокислотный состав фосфолипидов в почках березы повислой в зимне-весенний период в условиях Карелии и Якутии / Л. В. Ветчинникова, А. Ф. Титов, Т. Д. Татаринова [и др.] ; Институт леса Карельского научного центра РАН, Институт биологии Карельского научного центра РАН, Институт биологических проблем криолитозоны // Природные ресурсы Арктики и Субарктики. - 2024. - N 4, Т. 29. - C. 597-607. - DOI: 10.31242/2618-9712-2024-29-4-597-607
DOI: 10.31242/2618-9712-2024-29-4-597-607
Количество страниц: 8 с.
The response of biota to both global and regional climate changes represents a critical topic extensively examined in the scientific literature. This study aims to investigate the correlation between climatic changes in Central Yakutia and the phenological development of three indigenous steppe plant species. The species under consideration include Gagea pauciflora, Phlox sibirica, and Phlomoides tuberosa, which belong to different rhythmological groups. The research employed data from long-term phenological observations conducted in accordance with the methodology established by I. N. Beydeman (1974). A comprehensive analysis of the long-term climatic and phenological data reveals that the changing climate in Central Yakutia elicits a modest yet complex phenological response among the studied species. Notably, Gagea pauciflora, an ephemeroid, demonstrates the highest degree of phenological stability over a 50-year observation period, with all recorded shifts in its phenological development remaining statistically insignificant at the 0.05 level. The seasonal development of Gagea pauciflora occurs primarily in May and June and exhibits minimal sensitivity to meteorological conditions, indicating the species’ resilience to spring temperature fluctuations. Statistically significant alterations in phenological timing were noted exclusively during the vegetation termination phase for Phlox sibirica and Phlomoides tuberosa. The observed inertia in the phenological responses of these species to the climatic changes in Central Yakutia underscores a diverse array of adaptations among plants to northern environmental conditions, tenabling them to resist regional climate shifts and sustain phenological stability.
Фенологическая устойчивость степных растений в условиях меняющегося климата Центральной Якутии / Н. С. Данилова, С. З. Борисова, Н. Н. Егорова, Д. Н. Андросова ; Институт биологических проблем криолитозоны, Северо-Восточный федеральный университет им. М. К. Аммосова // Природные ресурсы Арктики и Субарктики. - 2024. - N 4, Т. 29. - C. 589-596. - DOI: 10.31242/2618-9712-2024-29-4-589-596
DOI: 10.31242/2618-9712-2024-29-4-589-596
Издательство: Книжное издательство
Год выпуска: 1965
Количество страниц: 156 с.
Издательство: Институт биологии
Год выпуска: 1977
Количество страниц: 180 с.
Количество страниц: 11 с.
Since the 1990s, climate variability has significantly increased, revealing various climatic anomalies. A clear trend of rising air temperatures has been observed in the permafrost zone and its adjacent areas, adversely affecting the state of frozen soils. Consequently, it is becoming increasingly important to assess the thermal stability of frozen soils in light of current climate change. As a result, it is becoming increasingly crucial to evaluate the thermal stability of these frozen soils in the context of ongoing climate change. A geothermal criterion (Gk) is suggested to assess the impact of climate change on the temperature regime of frozen soils in areas with seasonally active permafrost. (Gk) is represented through a dimensionless temperature simplex t* = (ti /Te) and the Fourier criterion. It is intended to analyze experimental data from geothermal permafrost research collected via borehole thermometry. The theoretical basis for the practical use of this proposed criterion has been established, showing its broad applicability and significant potential for interpreting data from long-term in-situ observations of temperature regime development in frozen soils within seasonally active permafrost.
Геотермический критерий оценки устойчивости многолетнемерзлых пород слоя годовых теплооборотов / А. Ф. Галкин, М. Н. Железняк, А. Ф. Жирков, В. И. Балута ; Институт мерзлотоведения им. П. И. Мельникова СО РАН, Институт прикладной математики им. М. В. Келдыша РАН // Природные ресурсы Арктики и Субарктики. - 2024. - N 4, Т. 29. - C. 543-552. - DOI: 10.31242/2618-9712-2024-29-4-543-552
DOI: 10.31242/2618-9712-2024-29-4-543-552
Издательство: ЯФ СО АН СССР
Год выпуска: 1974
Количество страниц: 196 с.
Экспериментальные методы исследования космических лучей сверхвысоких энергий : материалы всесоюзного симпозиума, 19-23 июня 1972 г., Якутск / Академия наук СССР, Якутский филиал Сибирского отделения, Институт космофизических исследований и аэрономии, Научный совет по комплексной проблеме "Космические лучи" ; ответственный редактор Д. Д. Красильников. - Якутск : ЯФ СО АН СССР, 1974. - 192 с.
Издательство: ЯФ СО АН СССР
Год выпуска: 1979
Количество страниц: 186 с.
Издательство: Саха сиринээҕи кинигэ издательствота
Год выпуска: 1953
Количество страниц: 326 с.
Издательство: РСФСР ҮНК государственнай үөрэх-педагогическай издательствота
Год выпуска: 1941
Серия, номер выпуска: Ч. 2
Количество страниц: 196 с.