Effects of shell morphological traits on the weight traits of Manila clam (Ruditapes philippinarum) |
| |
Authors: | Huo Zhongming Yan Xiwu Zhao Liqiang Zhang Yuehuan Yang Feng and Zhang Guofan |
| |
Institution: | 1. Institute of Life Science and Technology, Dalian Ocean University, Dalian 116023, China;2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China |
| |
Abstract: | The shell length, height, and width, live body weight, and edible tissue weight of Manila clam of 1, 2, and 3 years of age were measured, and their correlation coefficients were calculated. The shell morphological traits were used as independent variables, and live body weight or edible tissue weigh used as a dependent variable for calculating the path coefficients, correlation index and determination coefficients. The results showed that the correlation coefficients between each shell morphological trait and the live body weight or edible tissue weight were all highly significant (P < 0. 01). The shell height at 1-year old clams was highly correlated with the live body weight and edible tissue weight. The shell width of 2- to 3-year-old clams was strongly associated with the live body weight, while the shell length was closely linked to the edible tissue weight. The results of coefficients of determination for the morphological traits against weight traits agreed well with the results of path analysis. The correlation indices for all morphological traits against weight traits were approximately the same as determination coefficients regardless of clam age. The correlation indices (R2) of morphological traits against the live body weight of clams of all ages and edible tissue weight of 1-year-old clams were larger than 0.85, but R2 of morphological traits against the edible tissue weight of 2- and 3-year-old clams was smaller than 0.85, indicating that some other factors might be associated with the edible tissue weight of 2- and 3-year-old clams. Multiple regression equations were obtained to estimate shell length X1 (cm), shell height X2 (cm), shell width X3 (cm) against live body weight Y (g), edible tissue weight Z (g): for 1-year-old clams: Y = ?4.317 + 0.18X1 + 0.147X2, (X1 < 0.01, X2 < 0.01), Z = ?1.011 + 0.095X2, (X2 < 0.01); for 2-year-old clams: Y = ?15.119 + 0.249X1 + 0.176X2 + 0.688X3, (X1 < 0.01, X3 < 0.01), Z = ?4.248 + 0.198X1, (X1 < 0.05, X3 < 0.01); and for 3-year-old clams: Y = ?25.013 + 0.415X1 + 1.184X3, (X1 < 0.01, X3 < 0.01), Z = ?7.082 + 0.119X1 + 0.332X3, (X1 < 0.05, X3 < 0.01). |
| |
Keywords: | Ruditapes philippinarum Morphological traits Weight traits Path and multiple regression analyses |
本文献已被 ScienceDirect 等数据库收录! |
| 点击此处可从《生态学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《生态学报(英文版)》下载免费的PDF全文 |
|