Basic research on development of experimental animal model for weak heat tolerance and bbehavioral thermoregulation

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(1) A Field Study of Telemetry-Recording of the Body Temperature in Wild Mongolian PikaThe pika inhabiting in cold zone or in high mountains is thought to be adapted to cold as well as high-altitude environment. We have reported pika's high body temperature (39.6ﾟC), high metabolism and poor heat loss ability such as poor lack of thermal salivation. In this study, we measured the body temperature of wild pikas (Ochotona daurica) with a telemetry device in their natural borrows in Mongolia. Two pikas captured at Under Dov were implanted with transmitters in the abdominal cavity under anesthesia, and were returned to the own habitat. The mean body temperatures of the pakas were 39.65ﾟC and and 39.96ﾟC,though the data were limited to a short period of less than one day. The present results in wild pikas support pika's high body temperature in our previous studies.(2) Anatomical observations and thermal tolerance in pika (Ochotona curzoniae)The heat insulations of chest and abdomen skin were inferior to back and waist. For pikas lying on their belly is a behavioral heat loss response. The high altitude adaptation of Pika in cold environment is due to heat conservation and heat production to be different from cold tolerance in hypothermia like as hibernator.