Haldane ’ s rule and American black duck × mallard hybridization

  title={Haldane ’ s rule and American black duck × mallard hybridization},
  author={Ronald E. Kirby and Glen A. Sargeant and Dave Shutler},
Species ratios and rangewide distributions of American black ducks (Anas rubripes Brewster, 1902) and mallards (Anas platyrhynchos L., 1758) have undergone recent changes. Mechanisms behind these changes are not known with certainty, but recent investigations have focused on the possibility of competitive exclusion and the consequences of hybridization. Consequences of hybridization have been difficult to assess because of the difficulty in identifying hybrids beyond the F1 generation and lack… CONTINUE READING