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| Effects of Phenotypic Traits on Body Weight in Wild Population of Pearl Oyster Pinctada margariti f era |
| YAN Junxian,LIU Baosuo,LI Youning,CHEN Mingqiang,WU Kaichang,YE Le |
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Abstract To evaluate the effect of phenotypic traits on the body weight of pearl Pinctada margariti f era , the shell length (L1 ) ,shell height (L2 ) ,shell width (L3 ) ,ligament length (L4 ) and body weight (m) were measured randomly in 128 samples of the pearl oyster .The phenotypic correlation and path analysis were conducted to obtain correlation coefficient ,path coefficient and determination coefficient ,and then the effects of different phenotypic traits on body weight were obtained . The results showed that in correlation analysis ,correlation coefficient on body weight were L2 > L1 > L3 > L4 ( P< 0 .01) .In path analysis ,L2 showed the most direct (0 .589) ,and followed by the L3 (0 .278) and L1 (0 .143) .L2 had the maximal determination coefficient on the body weight (0 .347) ,then L3 (0 .077) , L1 (0 .02) and L4 (0.0001) in sequence ,with total determination coefficient of r2 =0 .854 .The regression equation was :m= -364.554+ 0 .858xL1 + 3 .032xL2 + 4 .371xL3 .The findings provide the theoretical foundation for variety selection of P .margariti f era .Shell high and shell width could be selected for a variety with high rate grow th and adaptability of pearl culture ,and shell length should be selected for improvement of body weight simultaneously .
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Received: 25 September 2015
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