Extra-pair fertilizations in mountain white-crowned sparrows

  title={Extra-pair fertilizations in mountain white-crowned sparrows},
  author={Paul W. Sherman and Martin L. Morton},
  journal={Behavioral Ecology and Sociobiology},
SummaryA population of white-crowned sparrows (Zonotrichia leucophrys oriantha) located near Tioga Pass, in the central Sierra Nevada of California, was studied during the 1985 and 1986 breeding seasons to determine how often chicks were not the offspring of both adults who reared them. Blood samples were obtained from 35 nesting pairs and feather pulp specimens were collected from all 110 young they fledged. Electrophoretic analyses of 4 polymorphic loci revealed that a minimum of 9 nests (26… 

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