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野生大熊猫生命表初编

1. 南充师范学院生物系
• 出版日期:2006-07-29 发布日期:2007-09-13

A STUDY 0N THE LIFE TABLE 0F WILD GIANT PANDAS

WET Fuwen，HU Jinchu， XU Guangzan，JIANG Mingdao，DENG Qitao，ZHONG Zhaomin

• Online:2006-07-29 Published:2007-09-13

Abstract: During1984-1986，we have got 69 specimens died in the field and determined the age of each specimen by cementum layers of incisors． According to the specimens we have studied the life table.The results are as follows：
Through the x2 -testthe sex ratio of pandas is 1:1．After calculating forth-back，left-right wldth and height of tha upper and lower canine and through vatianne analysis we find the male panda's canines are much bigger than those of the female pandas．We can judge the sex by the canines．
The youngest reproductive age of male panda is 7.5- 8.5-year-old and the female panda's 6.5—7.5．The oldest reproductive age of the male perhaps is 21 and the female can not be exactly known．But at 1east a 13-year-old female can breed．
According to the 61 specimens and observed directly the cubs,death rate we have made the life table，surviva1 curve death carve and death rate curve．The survival curve is like the letter"L" which indicates the high death rate of cubs．The death curve shows two death peaks：cubs and 12-14 year-old.
The net reproductive rate R0 =1.0672，the intrinsic rate of natural increase r=0.0056 the mean time per generation T =11.6790．
The 6-8 year-old pandas have the greatest reproductive value．As the age increases the reproductive value increases before 6-8 and decreases after 6-8．
As the bamboo has died of blooming in large area in recent decade and the food shortages during the past，the population are constantly declining．According to R。> 1 we know that the population may slowly increase as long as we protect the habits and renew the food bases．The herd of WUY1PENG "has verified this point．