三疣梭子蟹不同月龄形态性状的主成分分析
首发时间:2014-04-02
摘要:本研究测定了1~5月龄三疣梭子蟹的全甲宽、甲宽、体长、体高、大螯长节长、大螯不动指长、第一步足长节长、体重共8个性状并进行了主成分分析。结果表明:1~3月龄各性状间相关系数均达到极显著水平(P<0.01),4、5月龄部分性状间不显著(P>0.05)。各月龄三疣梭子蟹的主成分有所不同:1月龄三疣梭子蟹的第一主成分为长度因子,第二主成分为宽度因子;2月龄三疣梭子蟹的第一主成分为宽度因子,第二主成分为长度因子,第三主成分为体重因子;3月龄三疣梭子蟹的第一主成分为宽度因子;4~5月龄三疣梭子蟹的第一主成分均为体重因子,第二主成分均为长度因子。不同月龄三疣梭子蟹各性状的生长速率存在一定差异。1~3月龄形态性状的增长优先于体重,4~5月龄体重增长优先于形态性状的增长。
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Principal component analysis of morphometric traits of Portunus trituberculatu at different month ages
Abstract:Principal components analysis was used for eight morphometric traits of Portunus trituberculatus at different month ages, including full carapace width, carapace width, body length, body height, meropodit length of the claw, fixed finger length of claw, meropodit length of the first peraeopod and body weight. Results showed that correlation between any two traits at one to three month age was significant(P<0.01), however, some traits was not significant(P>0.05) at four to five month age. The principal components of P. trituberculatus at different month ages were different. When the P. trituberculatus was one month age old, the length factor was the first principal component, and width factor was the second principal component. At two month age, its first principal component was width factor, and its second and third principal component were length factor and body weight factor. However, width factor was the only principal component at three month age. At four and five month age, the first principal component was body weight factor and its second principal component was length factor. Conclusion: The speed of growth of morphometric traits was not same at different month ages. The growth of morphometric traits of P. trituberculatus at one to three month age was prior to body weight, while the growth of body weight took precedence of morphometric traits at four to five month age.
Keywords: Portunus trituberculatus morphometric trait principal component analysis
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No.4591182959039139****
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