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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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A comparison of cold hardness of lizards living at different altitude
Author of the article:LI Xiangtao, WANG Yan, LI Mei, MEN Shengkang, PU P
Author's Workplace:Institute of Biochemistry and Molecular Biology,School of Life Sciences,Lanzhou University
Key Words:Phrynocephalus erythrurus; Phrynocephalus przewalskii; supercooling capacity; inoculative freezing; heart rate; breathing rate; organic osmolytes
Abstract:Environment has a significant impact on physiological and genetic characteristics of animals, and low temperature is one of the main characteristics of the high altitude environment. However , until now, there are very few studies on cold hardiness of lizards. To study the cold hardiness of lizards living at different altitude, Phrynocephalus erythrurus (P.erythrurus) living in Hoh Xil and Phrynocephalus przewalskii (P.przewalskii) living in MinQin were used. The supercooling capacity, the ability to resist inoculative freezing, the heart rate and the breathing rate at 4 ℃ and the concentration of organic osmolytes (such as glucose, urea etc.) were measured. The results showed that the supercooling capacity between two species have no difference; but P.erythrurus have a stronger ability to resist inoculative freezing than P. przewalskii; when put the lizards in 4 ℃, the heart rate and the breathing rate of P.erythrurus were higher than P. przewalskii; but there were no regular differences of four organic osmolytes that may acted as cryoprotectants in these species.
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