中国林蛙的生殖量特征及其地理变化

FEATURE OF FECUNDITY AND GEOGRARHIC VARIATION IN RANA CHENSINENSIS

标本采自山西省境内的８个地点（纬度３４°５０′一４０°０８′．海拔４１０一１７００ｍ）．结果表明：（１）研究区域内性成熟雌蛙平均体长范围是３４．５一５２．３ｍｍ，高山森林带种用明显们高；研究种群雌蛙的体长显著低于东北居群。（２）平均生殖量的范围是４２２．４一８４０．９枚，个体的最低、最高值分别为３８和１９７８牧；平均相对生殖量的范围是１０．７一１８．０．个体的最低、最高值各为１．３和３４．４．与东北居群相比，生殖量的变异幅度较高。（３）除高山森林带外．其余调查点的生殖量与体长呈正相关，可用方程Ｒ＝ａＬ￣ｂ达，ｂ值在２．４７一３．３４间变化．（４）与同种的东北用群及欧洲林蛙相比，研究种群的繁殖对策接近，一选择；而在研究区域内，高山森林带的种倾向于Ｋ－选择。

he data were obtained from eight sparated sites (latitued 34°50′一40°08′N;altitude 410一1700m)in Shanxi province China.The conclusions are drawn as follows:(1)The meanbody length of thie ac;LiIt fci]、nIc.‘s iii tiic .study areas ranges from 34. 5mm to 52. 3mm,with thehighest valtie atan alpine belt. The mean body length is clearly lower than from theNortheast of China.(2)The range of mean fecundities is 422.4一840. 9 ova,the smallest being 38 ova and the larges 1978 ova。 The mean relative fecundities vary between 10.7一18. 0,the lowest and highest being 1. 3 and 34. 4 respectively..(3)Except the alpine belt,significantpositlve correlations are found between body length and fectindity in the populations studied。The relationship may bc deseribed by the allometrie equation:R =aL￣b ranging from 2. 47 to3. 34. (4)The reprodtictive strategy for the populations studied exhibits the characteristic ofr- selection in comparison with that of the population in Northeast China as well as the pupu- lation of R. temporaria。 However.within the study region,the population living in the alpinebelt tends to have the charcteristic of K-selection 。