基于GAM模型的子二代大鲵亲体产卵量分析

Analysis on the fecundity of giant salamanders(Andrias davidianus) F2 paraent based on GAM model

大鲵(Andrias davidianus)属于脊索动物门、两栖纲、有尾目、隐鳃鲵科,是中国特有的珍稀两栖动物。水生生物的体型性状对其繁育和产卵有影响,但目前关于子二代养殖大鲵亲体的体型性状对其繁殖特性的研究没有报道。为指导大鲵的科学人工繁育,采用GAM模型分析子二代大鲵亲体的体重、体长、肥满度和胸围等体型生产参数对成熟个体的产卵量影响。模型表明子二代养殖大鲵亲体的4个生长参数对产卵量有明显作用,体长和肥满度对产卵量影响是非线性递增的;子二代养殖大鲵亲体的体重对产卵量影响是单调递减的;胸围小于380 mm时,子二代养殖大鲵亲体的胸围对产卵量的影响是波动的;之后,随着胸围增加产卵量快速变少。对产卵量影响密切的体长、体重、胸围和肥满度分别是800~1000 mm、6000~7000 g、350~400 mm和0.6~1。

Giant salamanders（Andrias davidianus） belongs to Chordate,Amphibia,Caudata,salamander Cryptobranchus branch,is an unique amphibian species in China. The morphological characteristics of aquatic organism have influences on its fecundity,but such influences have not been reported in A. davidianus. In order to support the artificial breeding of A. davidianus,the GAM model was applied to evaluate the effects of body weight,body length,relative fatness and bust girth on the fecundity of F2 sexual mature giant salamanders. The results suggested that all 4 growth factors of F2 broodstock had significant influences on the fecundity. The influences of body length and relative fatness were nonlinear increasing. The body weight had a clear monotonic negative effect on the fecundity.The influence on the fecundity was fluctuant when the bust girth was below 380 mm,and above that the fecundity decreased rapidly with the increasing of bust girth. The range of body length,body weight,bust girth and relative fatness that had great influences on the fecundity of F2 A. davidianus broodstock were 800-1000 mm,4000-7000 g,350-400 mm and 0. 6-1. 0,respectively.