Biometrias Cyanopica cyanus (cooki)

Ola

Alguem me sabe dizer quais as diferenças (biometricas) entre machos/ femeas ; aves de primeiro ano/ adultos( depois de primeiro ano)

No Svensson diz que nao ha diferenças entre sexos, mas num artigo publicado na revistade anilhagem da bto (ringing & migration) mostram formulas matematicas com 3 medidas com qual se podem diferenciar com 90% certeza os sexos. abaixo o link para o artigo.
http://blx1.bto.org/pdf/ringmigration/23_4/alarcos.pdf


Obrigado e abraço
Joost

Joost
I read this in R+M , not having a lot of use for it (in Uk ) , forwarded to some anhiladores in Portugal.
Ref. Svennson , 1/ there cannot be a many skins of A-W-Magpie in Swedish museums. 2/ This type of sex-age discriminant doesn't easily come to the fore when using skins (shrinkeage etc ) 3/ similarly , "field " ringers have proposed several additions to Svennson e.g. Coal Tit , some of which he has subsequently included and some of which he has been unable to confirm from skins / present in Swedish populations.
The amateur anhiladore still hasmuch to contribute !!