Recording the peculiarities of life activities fixed on the surface of the incisors of the spotted ground squirrel (Spermophilus suslicus, Rodentia, Sciuridae)

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

The increments on the surface of the incisors of young spotted ground squirrels are wide, of medium definition. They probably reflect intensive nutrition and growth of the body. Starting with the third month of life, growth slows down, the width of the growths is decreased, and they become narrower and more distinct. Deformations appear in the form of swellings of the incisor wall. The frequency of occurrence of the deformations in underyearlings reaches a peak in the second half of July. The same pattern is observed in adult ground squirrels. By this time, gophers reach their maximum body weight. The majority of adult ground squirrels kept in captivity also reach the maximum body weight in the first half of July, this indirectly indicating the relationship between the appearance of deformations and the achievement of maximum fatness. Under laboratory conditions, at a temperature not exceeding 22°C, overwintered males and dry females after reaching their maximum body weight, even in the presence of food, fall into a stupor resembling a state of hibernation. Their body temperature is only 1–1.5°C higher than the room temperature, the animals are lethargic, they do not open their eyes during manipulations, and the frequency of breaths is 4–6 per minute. These observations suggest that ground squirrels living in natural conditions also fall into a similar hibernation, since the proportion of overwintered males and females among the individuals caught in the middle of summer is decreased. The appearance of deformations at this time seems to be associated with a violation of the normal growth of the incisors during physiological changes in the body, these being caused by the onset of a transition from the active nutrition of plant food to endogenous consumption of fat reserves characteristic of the state of hibernation. The record of autumn-winter hibernation is characterized by very narrow increments or deformations, a change in the enamel boundary, as well as a change in the contour of the incisor surface. After spring awakening, growths are at first narrow and distinct, 150–160 µm each, subsequently increasing in width, which is probably due to a gradual transition from endogenous nutrition of the body with fat deposits during hibernation to intensive nutrition of green vegetation. Lactation of females usually does not affect daily gains.

Толық мәтін

Рұқсат жабық

Авторлар туралы

V. Lobkov

I. I. Mechnikov Odessa National University

Хат алмасуға жауапты Автор.
Email: zoomuz2017@gmail.com
Украина, Odessa, 65058

D. Schepotkin

N. K. Koltsov Institute of Developmental Biology, Russian Academy of Sciences

Email: dm_shchepotkin@mail.ru
Ресей, Moscow, 119991

Әдебиет тізімі

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Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. The section of the lower incisor of the mottled ground squirrel, with summer deformations: 1 – narrow increments, 2 – deformed areas, 3 – wide increments.

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Метадеректер
3. Fig. 2. The basal end of the lower incisor of a male fingerling, extracted on 08/24/1973: 1 – daily increments, 2 – deformed surface.

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Метадеректер
4. Fig. 3. Basal section of the incisor of a speckled ground squirrel, extracted a month after awakening from hibernation: 1 – summer increments, 2 – deformed area before the hibernation zone, 3 – hibernation zone with IGE and a change in the contour of the incisor, 4 – narrow increments after awakening.

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Метадеректер
5. Fig. 4. Features of the increments on the lower incisor of the speckled ground squirrel a month after the spring awakening from hibernation: 1 – daily increments formed in summer, 2 – year–old deformations of the incisor wall, 3 – deformation before the hibernation zone, 4 – hibernation zone with IGE and a change in the contour of the incisor, 5 - daily increments formed after emerging from hibernation.

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