中华绒螯蟹幼蟹不同家系的形态判别分析

Discrimination Analysis Based on Morphological Parameters from Different Families of Juvenile Chinese Mitten Crab

【目的】通过形态学参数对不同家系中华绒螯蟹幼蟹进行家系鉴别的判别分析。【方法】对中华绒螯蟹6个家系中每只幼蟹分别度量了18个形态参数,应用聚类分析和逐步判别分析来进行处理和分析。【结果】聚类分析结果显示c家系、f家系趋异程度较高,a家系、b家系、d家系、e家系形态差异不大。判别分析显示:选用10个贡献大的参数建立的判别函数,a、b、c、d、e、f家系判对概率分别为:83. 3%、93. 3%、96. 7%、93. 3%、0%、100%,平均拟合概率为77. 8%,交叉验证平均拟合概率为61. 1%。但实际验证结果并不理想,其中a (e)家系幼蟹容易判入e (a)家系,b家系判对率为53. 3%,c家系判对率为80%,f家系判对率为60%,d家系判对率为0%。【结论】因此基于形态参数的家系判别分析并不适用于本育种群体全部家系,形态差异很难作为本育种群体家系鉴别的依据。

【Objective】We used morphological parameters to discriminate pedigrees of juvenile Chinese mitten crabs from different families.【Method】18 metric parameters representing morphological characters of juvenile crab from six families were measured and then analyzed by the cluster analysis and the stepwise discrimination.【Result】The results of cluster analysis shows:The morphology of juvenile Chinese mitten crab from family a,family b,family d and family e were similar,but quite different from family c and family f.The result of stepwise discrimination based on the 10 morphological parameters with high contribution to the discrimination shows that the accuracy of discrimination of family a,family b,family c,family d,family e and family f were 83.3%,93.3%,96.7%,93.3%,0%and 100%,respectively.The average of fitting accuracy of discrimination was 77.8%,and the average of fitting accuracy of discrimination of cross-validation was 61.1%.However,the actual effect is not ideal.The member of family a(e)was tend to clustered to family e(a),the accuracy of discrimination of family b,family c and family f were 53.3%,80%and 60%,respectively,while family d was 0%.【Conclusion】Therefore,the discrimination analysis based on morphological parameters from different families was not suitable for our breeding families,and it is hardly to discrimination of different families according to the morphological parameters.