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Dominance survival and enzyme polymorphism in dark eyed juncos junco hyemalis


Dominance survival and enzyme polymorphism in dark eyed juncos junco hyemalis



Evolution 32(4): 697-711



ISSN/ISBN: 0014-3820

DOI: 10.2307/2407486

The genetic structure of wintering populations of dark-eyed juncos was examined by starch gel electrophoresis. Among different flocks and different years, only mild heterogeneity was found. These populations were polymorphic at 16.6% of 18 loci examined. The average number of variants/polymorphic locus is 3.33, and the average proportion of loci heterozygous for an individual is 0.053. Using color marked birds, it was established that in the dominance hierarchy of a flock, high ranking birds were usually heterozygous for the enzyme L-leucylglyclglycine peptidase. Employing 4 experimental flocks captive in aviaries, under conditions of food restriction dominant birds were likely to show higher survival than low ranking birds. In order of decreasing importance, survival in the aviaries (defined as the maintenance of body weight above a criterion threshold) could be predicted from dominance rank, genotype, body weight, sex, bill width, bill length, hood coloration and tarsal length. The single best predictor of high dominance rank was long wing length.

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Accession: 005190252

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Related references

Dominance, Survival, and Enzyme Polymorphism in Dark-Eyed Juncos, Junco Hyemalis. Evolution; International Journal of Organic Evolution 32(4): 697-711, 1978

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