@misc{indiciaebe913b9fd8df,
  title = {North-south gradient in survival rates in midcontinental populations of mallards},
  author = {Jay B. Hestbeck},
  year = {1990},
  doi = {10.2307/3809030},
  url = {https://pubs.usgs.gov/publication/5222397},
  note = {Source identifier: 5222397}
}