靓巴非蛤形态性状对体质量的影响

Effect of Morphological Traits on Body Weight in Clam Paphia schnelliana

2019年10月,在北部湾采集339枚野生靓巴非蛤,测定其壳长、壳高、壳宽、前缘长、后缘长和体质量,采用相关性分析、多元逐步回归和通径分析探究其表型性状对体质量生长线数的影响。试验结果显示,该取样群体靓巴非蛤生长线数为36.4±3.2;靓巴非蛤体质量变异系数最大,具有最大选育潜力,且形态性状与体质量均呈极显著相关( P <0.01),其中壳高与体质量的相关系数最高为0.949,后缘长与体质量的相关系数最低为0.759;逐步回归分析结果显示,对靓巴非蛤体质量有影响的主要形态性状有壳长、壳高和壳宽,建立了靓巴非蛤壳长、壳高、壳宽对其体质量的回归方程( r 2 =0.965)。通径分析结果显示,对靓巴非蛤体质量影响最大的形态性状为壳宽,其次是壳高和壳长。试验结果表明,靓巴非蛤以体质量为选育目标进行良种选育时应主要选择壳宽,同时加强对壳高的协同选择。

Shell length, shell height, shell width, anterior length, posterior length, and body weight were measured and the number of growth lines were recorded in 339 samples of wild clam Paphia schnelliana collected from Beibu Gulf in October 2019, and correlation between morphological trait and body weight was analyzed by correlation analysis, multiple stepwise regression analysis and path analysis in order to explore the effect of morphological traits on body mass. The results showed that the clam had growth lines of 36.4±3.2, with the maximal variation coefficient of body weight, significantly correlated with all the morphological traits, and the maximal correlation coefficient (0.949) with shell height, and the minimal correlation coefficient (0.759) with posterior length, indicating that the body weight had the greatest breeding potential. The stepwise regression analysis revealed that the most important morphological trait affecting the body weight was the shell length, followed by shell height and shell width, and the regression equations of shell length, shell height and shell width on body weight was established ( r 2 = 0.965 ). The path analysis showed that the shell width had the greatest impact on the body weight, followed by the shell height and shell length. The findings indicated that the shell width was selected mainly, and that the synergistic selecting of the shell height was strengthened at the same time selective breeding of body weight in clam P. schnelliana .