Male quality and territory quality in the great tit parus major

摘要: Abstract In this study there was no positive significant relationship between the quality of male great tits, as measured by average strophe length (a is a short burst song), and territory quality. (1) Males singing longer strophes did not defend territories in areas higher recruitment, (2) naturally settling males were better singers than replacement birds were. The second result probably caused difference age composition two groups, because yearlings differ significantly length. These observations on non-migratory species are contrast to those several other studies passerine birds, which mostly concerned with migratory species. predicted be closer that migrate