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| Mathematical Analysis of Effects of Morphometric Attributes on Body Weight for Sea Urchin Hemicentrotus pulcherrimus |
| LENG Xiaofei,ZHANG Yan,ZHANG Weijie,LIU Mingtai,JING Chenchen,SONG Jian |
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Abstract Two hundred and sixty sea urchin Heemicentrotus pulcherrimus were captured from Tahe bay coastal Dalian and their test height (L2 ) ,test diameter (L1 ) and body weight (m) were measured after sex determination . The relationship between morphometric traits and body weight were quantitatively analyzed by correlation analysis and path analysis .The results showed that the sex ratio of the sea urchin was 1∶1 ,and there were no significant differences either in economic traits (test traits and body weight) or ecological traits (height‐diameter ratio) (P>0 .05) .Correlation coefficients among economic traits were high in both male and female sea urchin .The maximal correlation coefficients between test diameter and body weight were observed in both male and female sea urchin (0 .960 in female and 0 .956 in male) .Path analysis revealed that test diameter (0 .723 in female and 0 .645 in male) out weighed more to body weight than to test height (for female and male respectively were 0 .280 and 0 .362)both for male and female sea urchin .Morphometric attributes on body weight for male sea urchin were con‐sistent with the female ones .Model to predict body weight for male sea urchin was expressed as m=1 .78L1 +1 .32 L2 -75 .78 (r2 =0 .948) .Model to predict body weight for male was m=2 .17L1 +1 .13L2 -89 .05 (r2 =0 .944) . For both genders of sea urchin ,model to predict body weight was established as m=1 .96L1 +1 .22L2 -81 .72 (r2=0 .944 ) .
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Received: 25 April 2016
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