Now showing items 9305-9324 of 9563

    Subject
    waterfowl; data collections; biological surveys; abundance; migratory species; rainfall [1]
    waterfowl; diets; abundance; population dynamics; data collections; stomach content [1]
    waterfowl; ecological distribution; food availability; diets; habitat; biological surveys; nesting; surface water; hunting; droughts [1]
    waterfowl; food availability; biological surveys; abundance; aerial surveys; habitat; migratory species; rainfall; surface water [1]
    waterfowl; food availability; biological surveys; abundance; migratory species; rainfall [1]
    waterfowl; inventories; ecological distribution; aerial surveys; habitat; diets; pintail duck; redhead ducks; food availability; population number [1]
    waterfowl; laughing gulls; least tern; forsters tern; royal tern; sandwich tern; black skimmers; population characteristics; habitat loss; gull-billed tern; Caspian tern [1]
    waterfowl; mallard duck; pintail duck; coots; inventories [1]
    waterfowl; mottled ducks; abundance; biological surveys; inventories; aerial surveys; population number [1]
    waterfowl; mottled ducks; juveniles; nests; biological surveys [1]
    waterfowl; mottled ducks; tagging; juveniles [1]
    waterfowl; rainfall; aerial surveys; biological surveys; abundance; ecological distribution; local movements [1]
    waterfowl; redhead ducks; abundance; ecological distribution; sex ratio [1]
    waterfowl; survey; wildlife conservation; mallards; pintails; green-winged teal; geese; mottle ducks; white-fronts; hunting; counts [1]
    waterfowl; tagging; ecological distribution; data collections; hunting [1]
    watershed management [25]
    watershed protection [4]
    watershed survey [1]
    watersheds [2]
    watersheds; drainage water; water conservation; models; flooding; flood forecasting [1]