骨龄学方法测定中国水蛇的年龄

取不同体长的中国水蛇（Ｅｎｈｙｄｒｉｓ ｃｈｉｎｅｎｓｉｓ）标本４４条（２９♀♀，１４♂♂，１胎蛇），剥取心脏附近的椎骨５枚，按常规骨骼磨片方法磨制椎骨中部的横切片，于低倍光学显微镜下观察。可以看到，磨片上有清晰的生长层，年老的个体更典型。用椎骨半径对生长层厚度的回归方程和ｖｏｎ Ｂｅｒｔａｌａｎｆｆｙ的生长方程式估算在骨骼生长过程中被再吸收而消失了的生长层。结果，４４条标本的年龄范围是０～１１．

SKELETOCHRONOLOGICAL AGE ESTIMATES FOR THE Enhydris chinensis

Enhydris chinensis (29 females,14 males,1 focus) got in the market were used in the examination of the middle cross sections of vertebrae ground in an ordinary abrasive disc way (taking five vertebraes near the heart).Under a microscope their annual rings were observed.We can see that the older the snakes are,the clearer their rings are.Correctness of the resorbed growth layers in the process of the skeleton growth by the regression equation of vertebrae radius vs growth layer width and von Bertalanffy growth equation indicates that the ages of the Enhydric chinensis specimens range from 0-11 2 years,their ages and their body length form a ringe relationship,the regression equation of the females is L (total length)=272 4+647 2lg A (year), r =0 9598, P <0 01;that of the males being L =317 5+46 3 A (year), r =0 9527, P <0 01,and the earliest sexual maturity of the females appears at the age of 1 8 years,that of the males at 1 0 year.