南海毛蚶形态特征对体重的相关分析

随机选取同龄南海毛蚶Scapharca subcrenata雌性62只、雄性59只,测量壳长、壳厚、壳高、后闭壳肌直径、放射肋数及活体重。采用通径分析方法研究南海毛蚶5个形态特征对体重的总效应,并以综合决定系数为确定形态性状重要性的准则。结果表明,两性中壳厚、壳高和壳长与体重均为正相关(p<0.01),直接和间接途径都不是体重的限制因素。壳厚、壳高的平均综合决定系数分别为0.423和0.412,是影响体重最主要因素且都具有育种意义。

Correlation between morphological traits and body weight of Scapharca subcrenata from South China Sea

Identically aged Scapharca subcrenata from the South China Sea were chosen at random(62 females and 59 males) to measure the morphological traits such as shell length,shell thickness,shell height,rear shell-closing muscle diameter,number of radial spokes and live body weight.The path analysis procedure was utilized to investigate the total effect of 5 morphological traits on the body weight of Scapharca subcrenata and the total decision coefficient was used as a criterion for determination of relative importance of the morphological traits.The results showed that the shell thickness,shell height and shell length were all positively related to the body weight for both the gender groups(p<0.01);moreover,neither direct nor indirect paths were limiting factors of body weight.The total coefficients for shell thickness and shell height,on average,amounted to 0.423,0.412 respectively,evincing that these two traits are most influential factors on body weight and are relevant to breeding.