| Title of the article |
THERMOBIOLOGICAL MECHANISM OF SPATIALLY TEMPORAL DIVISION OF ACTIVITY OF MEDIUM,
EREMIAS INTERMEDIA, AND LINEATURE, E. LINEOLATA, LABELS (REPTILIA, LACERTIDAE) IN KYZYLKUM
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| Authors |
Cherlin Vladimir Aleksandrovich, Doctor of biological sciences, sub-department of zoology and physiology, Daghestan State University (4A Batyraya street, Makhachkala, Daghestan), E-mail: cherlin51@mail.ru
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| Abstract |
Background. The reptilian thermobiology is the most important factor determining their ecology, spatial and temporal structure of activity and biotopical distribution. But the mechanisms of this process are poorly understood. This article describes the results of studies illustrating the specific mechanisms of the influence of certain thermophysiological characteristics and characteristics of thermoregulation in two sympatric species of racerunners on their ecology and their biotopical selection in Kyzylkum desert.
Materials and methods. In the Kyzylkum desert we studied the thermophysiological characteristics of the full activity and temperature stabilization ranges, as well as the thermoregulation techniques in two species of racerunners. Also, in this area we studied the climatic conditions in different biotopes. All the data obtained were associated with observations of the spatial and temporal structure of the daily activity of lizards and their biotopical preferences.
Results. The aralo-caspian racerunner is noticeably less thermophilic in thermobiological indicators than the striped racerunner. The temperatures of full activity in the aralo-caspian racerunner are 32,3–39,0º, the range of temperature stabilization is 34,0–35,5º. In the striped racerunner, these indicators are 34,5–41,0º and 35,5–37,0º, respectively. For some morphological and physiological reasons, under the same conditions, the body in aralo-caspian racerunner heats up faster than in striped racerunner. Striped racerunners, unlike aralo-caspian ones, can actively use the lower branches of bushes for thermoregulation, i.e. to separate their body from the hot soil during the warmest part of day.
Conclusions. The thermobiological characters and the manner of thermoregulation lead to differences in the spatial-temporal activity structure and biotopical differences between aralo-caspian and striped racerunners: the striped racerunners have the ability to use and actually use more open spaces for activity and a hotter time of day, while aralo-caspian ones use more matted areas with openwork or dense shadow, with shrubs and trees, and are active at more fresh time of day.
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Key words
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aralo-caspian racerunner, striped racerunner, thermal biology, body temperature, mechanisms of ecological separation
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| References |
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