Seasonal variation in plasma colloid osmotic pressure in the bat,Antrozous pallidus |
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| Affiliation: | 1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku Katsura, Nishikyo-Ku, Kyoto, 615-8510, Japan;2. Department of Molecular and Cellular Physiology, Graduate School of Medicine, Kyoto University, Sakyo-ku Yoshida Konoe-cho, Kyoto, 606-8501, Japan |
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| Abstract: | - 1.1 The body weight (BW), hematocrit and plasma colloid osmotic pressure (COP) of adult and juvenile pallid bats maintained under constant laboratory conditions were measured periodically from August through April.
- 2.2. In the adult, BW and plasma COP showed seasonal cycles with peaks occurring in December and October through December respectively. A significant seasonal correlation between BW (fat) and plasma COP was found.
- 3.3. In the juvenile, a seasonal cycle was found for plasma COP, but the peak value was reached later in the year than in the adult. The need for a minimal fat content to support hibernation in the juvenile bat was suggested.
- 4.4. Seasonal changes in plasma volume appear to alter plasma COP: the quantity of circulating plasma protein appears to remain constant.
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