紫貂头骨的性二型差异及性别鉴定分析OA

To understand the sexual dimorphism of the sable skull and to identify the evidence used for sex determination based on skull characteristics,10 indices(profile length,basal length,median palatal length,least breadth between the orbits,zygomatic breadth,length of tympanic bulla,width of tympanic bulla,greatest skull width,upper tooth row length,lower tooth row length)from 50 sable skulls with known sexes were measured.Descriptive analysis and principal component analysis were conducted to explore the sexual dimorphism of the skull,followed by discriminant analysis for sex identification on samples with the unknown sexes.The results indicated significant sexual dimorphism in 8 skull indices between male and female sable skulls(P<0.05),with the exception of the length and width of the tympanic bulla(P>0.05).According to the discrimination functions,single-variable identification based on profile length and basal length matched the results of molecular biological sex identification with an accuracy rate of 100%.The identification results of the nine combined variable groups,including profile length+upper tooth row length,basal length+upper tooth row length,profile length+zygomatic width+upper tooth row length,profile length+basal length+zygomatic width+upper tooth row length,profile length+lower tooth row length,profile length+upper tooth row length+lower tooth row length,profile length+basal length+upper tooth row length+lower tooth row length,profile length+zygomatic width+upper tooth row length+lower tooth row length,and profile length+basal length+zygomatic width+upper tooth row length+lower tooth row length were also in agreement with the outcomes of molecular biological sex identification with achieving 100%accuracy.This research demonstrates the scientific validity and effectiveness of the skull morphology-based sex identification method for the sable.