摘要 : We analyzed vriation in body mass, wing chord, and culment in the Mexican Jay (Aphelocoma ultramarina) in relation to age, sex month, and year using linear regression. All measurements were taken from color-banded individuals of k... 展开 We analyzed vriation in body mass, wing chord, and culment in the Mexican Jay (Aphelocoma ultramarina) in relation to age, sex month, and year using linear regression. All measurements were taken from color-banded individuals of known sex and age as part Of a long-term study in the chiricahua Mountains of Arizona. There was no significant vari- Ation among observers for mass, but there was for wing chord and culmen. Therefore, analy- Yses of the latter measures were restricted to data of one observer. 收起