John R. Sauer H.W. Heusmann 1997 <p>During 1989-1992, spring surveys of randomly selected, 1-km² plots, stratified by physiographic strata, were conducted in the Atlantic flyway from New Hampshire to Virginia, to estimate mallard (<i>Anas platyrhynchos</i>) pairs. All potential waterfowl habitat in each plot was checked by ground crews. The adjusted mean mallard pair estimate over the 4-year period was 300,849 (range 271,193-320,642, mean SE 22,455) for the region surveyed. Ground plot checks are a practical way to survey mallard pairs in the upper Atlantic flyway.</p> application/pdf 10.2307/3802116 en Wiley A survey for mallard pairs in the Atlantic flyway article