发冠卷尾性别判定的初步研究

Sex Identification of Hair-crested Drongo (Dicrurus hottentottus) by Discriminant Models Based on Morphological Measurements

发冠卷尾(Dicrurus hottentottus)由于被认为是雌雄同态而在野外难以鉴别性别。我们研究了河南董寨国家级自然保护区79只已用分子生物学方法鉴定出性别的发冠卷尾(D.h.brevirostris)在形态量度上的性别差异,并据此构建了判别式方程,用于鉴定其性别。所考察的体征包括体重、喙长、喙粗、头喙长、跗跖长、翅长、尾长、体长、发羽数、第一根发羽长、第二根发羽长、第三根发羽长和三根发羽的平均长度。研究发现,雌性与雄性发冠卷尾的喙粗、头喙长、跗跖长、翅长、尾长、发羽数和第一根发羽长均存在显著差异(均P<0.05),雄性一般大于雌性。利用具有显著差异的形态量度分别构建判别方程来区分个体性别,发现以翅长构建的判别方程具有最高的平均判别准确性,达81.0%。该方程对雌性的判别准确性略低于多变量判别方程,因此我们推荐使用该判别方程对发冠卷尾的性别进行鉴定,即D(判别分数)=0.239×翅长-40.359。

Hair-crested Drongo（Dicrurus hottentottus） is monomorphic bird and is difficult determined their sex in the field.In this study,we created a disriminant model based on the morphometrical measurements from 79 specimens of D.h.brevirostris to identify sex for those specimens who were capture in Dongzhai National Nature Reserve,Henan and their sex were determined by using molecular technical method.The morphometrical measurements included body mass,bill length,bill depth,bill-head length,tarsus length,wing length,tail length,body length,number of hairs,length of the longest hair,length of the second-longest hair,length of the third-longest hair and average length of three longest hairs.The measurements of bill depth,bill-head length,tarsus length,wing length,tail length,number of hairs and length of the longest hair took from males were significantly larger than those from the females.By constructing the discriminant model based on a given single morphological measurements that is significant difference between male and female,we found that model based on wing length had the highest accuracy（81.0%） on average than models built by multiple morphological measurement.Therefore,we recommend the wing length model D（discriminant score）=0.239×wing length-40.359 can be used to determine the sex for Hair-crested Drongo.