Blood Properties of Plateau Zokor in Underground Burrow Conditions
The plateau zokor(Eospalax baileyi)is a unique underground rodent found in the Qinghai-Xizang Plateau.It lives in closed underground tunnels throughout its life and has strong adaptability to environments with severe hypoxia in un-derground tunnels.In order to explore the adaptation strategies of plateau zokors to the severe hypoxia underground habi-tats,the volume fraction and mass concentration of O2 and CO2 in the tunnel of plateau zokors were measured at the habi-tat site.At the same time,the blood parameters of plateau zokors were also measured at different altitudes and simulated underground tunnel gas volume fraction conditions.The results showed that,compared with the atmosphere,the volume fraction and mass concentration of O2 in zokor burrows at different altitudes decreased significantly,while the volume frac-tion and mass concentration of CO2 increased significantly.Compared with the altitude of 2,700 m,the O2 volume fraction and mass concentration in the plateau zokor tunnel at altitude of 3,700 m were significantly decreased,and the CO2 volume fraction and mass concentration were significantly increased.There was no significant difference in blood routine param-eters of plateau zokor between the burrows gas simulation group and the 3,700 m group.The red blood corpuscle(RBC),hemoglobin(Hb),and hematocrit(HCT)of plateau zokors in 2,700 m group were significantly lower than those in 3,700 m group,while the mean corpuscular volume(MCV)was significantly higher than that in 3,700 m group.Arterial partial pres-sure of oxygen(PaO2)in 2,700 m group was significantly higher than that of 3,700 m group and burrows gas simulation group.Arterial blood partial pressure of carbon dioxide(PaCO2)was not significantly different between the burrows gas simulation group and 2,700 m group,but was significantly higher than that in 3,700 m group.Arterial oxygen saturation(SaO2)of plateau zokors in burrows gas simulation group was significantly lower than that in 3,700 m and 2,700 m groups.There was no significant difference in arterial pH between the three groups.These results suggested that plateau zokor's lower PaO2,PaCO2,and SaO2,increased the number of red blood cells in blood,and decreased the volume of red blood cells,which resulted in stronger blood oxygen utilization rate and stronger adaptability to the severely hypoxic habitat in un-derground burrows.
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