William J. Bleier George M. Linz Daniel J. Twedt 1992 <p><span>Electrophoretic differences at 15 presumptive loci were used to assess allelic frequencies, heterozygosities, and polymorphism for male Yellow-headed Blackbirds (</span><i>Xanthocephalus xanthocephalus</i><span>) collected in east-central Alberta, north-central North Dakota, and east-central South Dakota. Five loci were polymorphic and mean heterozygosities ranged from 0.119 to 0.133. Significant differences were detected among these geographic populations of Yellow-headed Blackbirds, primarily due to differences in the allelic frequencies of isocitrate dehydrogenase and glucose-6-phosphate dehydrogenase. Differences detected were not sufficient to uniquely identify the geographic origin of Yellow-headed Blackbrids.</span></p> application/pdf 10.1139/z92-305 en Canadian Science Publishing Genetic variation in male Yellow-headed Blackbirds from the northern Great Plains article