| 摘要: |
| 随机抽取三疣梭子蟹(Portunus trituberculatus)抗病候选群F2代(F2S) 120 只及普通养殖群(RS)88只, 对其头胸甲宽X1、头胸甲长X2、螯足长X3、Ⅰ步足长X4、Ⅱ步足长X5、Ⅲ步足长X6、游泳足长X7、中额齿间距X8、两侧额齿间距X9、下额齿间距X10、体质量Y等11 个生长性状进行测量, 计算每个群体内性状间的相关系数。采用通径分析方法计算, 以形态性状为自变量对体质量作依变量的通径系数和决定系数, 并进行各性状对体质量影响大小的分析。结果表明, 两个群体所选的10 个参数均与体质量显著相关。通径分析显示头胸甲宽对F2S 群体质量影响最大, Ⅱ步足长对RS 群体质量影响最大,他们的通径系数分别为0.498 和0.609。间接通径分析表明Ⅲ步足长和两侧额齿间距分别对F2S 群和RS 群体质量间接影响最大。经逐步多元回归分析, 两个群体各有4 个参数对体质量的回归分析达到显著水平, 并建立了两个不同的回归方程, F2S 群: Y=－108.331＋8.259 X1＋11.372 X4＋8.382 X7－37.098 X9。RS 群: Y=－106.763＋7.725 X1＋18.452 X5－73.358 X9＋45.877 X10。回归方程可以为三疣梭子蟹遗传育种提供一定的理论基础。 |
| 关键词: 三疣梭子蟹, 抗病候选群F2代F2S, 普通养殖群RS, 形态性状, 体质量, 通径分析 |
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| 基金项目:国家863计划项目(2012AA100809); 国家富民强县科技专项(2011F012); 高等学校博士学科点专项科研基金资助项目(20103305120002); 浙江省水产育种专项(2012C12907-3); 宁波市海洋蟹类产业科技创新团队项目(2011B81003); 宁波市海洋与渔业专项(2011-1-7); 宁波市农业科技专项(201015) |
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| The effects of morphometric traits on body weight in F2 Population of Swimming crab Portunus trituberculatus |
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| Abstract: |
| 120 crabs from the second generation of candidate disease-resistance stock which were screened by Vibrio alginolyticus in our lab (F2S) and 88 regular stock crabs(RS) were randomly collected for measuring 11 morphormetric traits including the carapace width(X1), carapace length(X2), cheliped length(X3), first walking leg length(X4), second walking leg length(X5), third walking leg length(X6), natatorial leg length(X7), mid frontal eminence spine width(X8), zygomorphic frontal eminence spine width(X9), nether frontal eminence spine width(X10) and body weight(Y). The correlation coefficients among the traits were calculated, and then path analysis was conducted by taking the body weight as a dependent variable, and other ten morphometric traits as independent variables. The results showed that all of the morphometric traits are significantly correlated with body weight in both two stocks. The carapace width(0.498) and second walking leg length(0.609) have the strongest direct effects on body weight of F2S and RS, respectively, while third walking leg length and zygomorphic frontal eminence spine width have the strongest indirect effects. Four morphormetric traits were significantly on the multiple regression relationship both in two stocks. Based on this result, multiple regression equations were established as follows: F2S: Y=－108.331＋ 8.259 X1＋11.372 X4＋8.382 X7－37.098 X9; RS: Y=－106.763＋7.725 X1＋18.452 X5－73.358 X9＋45.877 X10. This paper provides a theoretical tool to measure breeding crabs in aquaculture. |
| Key words: Portunus trituberculatus selected line F2S regular stock RS morphometric trait body weight path analysis |
