华贵栉孔扇贝表型性状相关和路径分析

2006年4月,从广东湛江乌石养殖群体中挑选性腺成熟的个体作为亲本繁殖子一代。2006年12月从子一代群体随机取样200个个体,测量壳长、壳高、壳宽、肌肉重、壳重和全湿重共6个性状指标,利用测量数据进行表型性状相关和路径分析。结果表明：（1）表型性状间存在显著的相关性（P〈0.01）。全湿重与壳长、壳高、壳宽、肌肉重和壳重存在显著的正相关（P〈0.01）,相关系数分别为0.9343、0.8959、0.8991、0.8820和0.9379。（2）壳长、壳宽、肌肉重、壳高和壳重对全湿重具有正直接影响,其值分别为0.3971、0.3219、0.1721、0.0896和0.0669。本研究结果说明了对壳长、壳高、壳宽、肌肉重和壳重进行直接选择可以提高全湿重,这些性状可以作为选育的指标。

Correlation and path coefficient analysis for phenotypic traits of noble scallop Chlamys nobilis

In April of 2006, a base population of the noble scallop Chlamys nobilis was established by collecting parental breeders from the stocks in Wushi, Zhanjiang. In December of 2006, 200 individuals were randomly sampled from the base population and subjected for correlation and path coefficient analysis. It was found that there were statistically significant phenotypic correlations among the traits (P < 0.01). Total weight was significantly and positively correlated with the shell length (r = 0.934 3), shell height (r = 0.895 9), shell width (r = 0.899 1), muscle weight (r = 0.882 0) and shell weight (r = 0.937 9), respectively. Shell length, shell width, muscle weight, shell height and shell weight had positive and direct effects on the total weight, with values of 0.397 1, 0.321 9, 0.172 1, 0.089 6 and 0.066 9, respectively. Shell length, shell width and muscle weight had higher direct effects on the total weight than shell height and shell weight. A combined evaluation of correlation, direct effects and indirect effects showed that direct selection for shell length, shell width, muscle weight, shell height and shell weight would be effective to improving the total weight. It was concluded that these traits could be regarded as the selection criteria in breeding programs of the species.