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Aggressive behavior in wintering dark eyed juncos junco hyemalis determinants of dominance and their possible relation to geographic variation in sex ratio


Aggressive behavior in wintering dark eyed juncos junco hyemalis determinants of dominance and their possible relation to geographic variation in sex ratio



Wilson Bulletin 91(3): 371-383



Determinants of dominance among free-ranging dark-eyed juncos visiting baited feeding stations are considered. The data are evaluated in terms of factors that may have affected evolution of geographic variation in winter sex ratio. Dominant juncos near Bloomington, Indiana [USA], tend to be adult males of large body size, as indicated by wing length. Because size varies with sex and age in the junco, the independent effect of these variables on dominance is difficult to determine; however, size appears to be the best single indicator of status. Early arrival on the wintering grounds also contributes positively to status. Because males are dominant and dominants are reputed to exhibit greater survivorship, females may have responded over evolutionary time to this set of conditions by migrating south of regions of maximal male abundance to lessen the effects of intersexual competition.

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Accession: 004691233

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Related references

Aggressive behavior in wintering dark-eyed juncos determinants of dominance and their possible relation to geographic variation in sex ratio. Wilson Bulletin 913: 371-383, 1979

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