BIOMETRICS OF GREATER SCAUP AYTHYA MARILA (AVES, ANSERIFORMES) WINTERING ON THE SZCZECIN BAY

• Main Author: EWA DZIAŁA-SZCZEPAŃCZYK
• Format: Text
• Language: unknown
• Published: Львовский национальный университет ветеринарной медицины и биотехнологий имени С.З. Гжицкого 2009
• Subjects: GREATER SCAUP,AYTHYA MARILA,BIOMETRY,BODY SIZE; Aythya marila; greater scaup
• Online Access: http://cyberleninka.ru/article/n/biometrics-of-greater-scaup-aythya-marila-aves-anseriformes-wintering-on-the-szczecin-bay; http://cyberleninka.ru/article_covers/16854654.png

AbstractThe object of the biometric characteristics were 90 specimens of Greater Scaup Aythya marila 66 males (6 immature and 60 adult) and 24 females (6 immature and 18 adult). Biometrics included five parameters: body weight, body length, sternum length, tarsometatarsus length, and folded wing length. The average values of the above parameters were analyzed in regard to the age and the sex of the birds. The mutual relations between the biometric features of the investigated birds were also ascertained. Among all the measurements, the highest variability was noted in the body weight. A significant sexual dimorphism was indicated in the body weight of the examined Aythya marila group all the analyzed parameters achieved higher values in the males than in the females. In both male and female group, the adult and the immature specimens differed significantly in merely one parameter, ie. the length of the folded wing. In both sexes the adult specimens achieved significantly higher values of this parameter as compared to the immature ones. All the analyzed parameters remained in a significant positive mutual correlation. The lowest value of the correlation coefficient was noted for the relation between the tarsometatarsus length with the lengths of the body and the sternum.