WebJanuary 1, 1982 Nesting waterfowl were studied in 1978 and 1980 on 15 newly established islands with an area of 19 ha in 7,430-ha Lake Audubon in the Audubon National Wildlife Refuge (NWR), North Dakota. Islands ranged in size from 0.2 to 5.0 ha and were 60-1,600 m from the mainland. WebJul 1, 2003 · Gadwall nests were located from late-April to mid-July by dragging a chain between two all-terrain vehicles through prairie nesting habitat and observing females as they flushed from the nest (M. Hoff and E. R. Loos unpubl. data). Thirty-seven females were subsequently captured using a long-handled hand net or with a nest-trap.
DU Season Review: Waterfowl Numbers Down, Drought Lingers - Outdoor Life
WebIncubation is by female only, 24-27 days. Young: leave nest shortly after hatching. Female leads young to water, where they find their own food; often seen on more open water than young of other dabbling ducks. … http://www.birdweb.org/Birdweb/bird/gadwall file heads
Determinants of mallard and gadwall nesting on …
WebGadwall pairs usually arrive on their breeding grounds as much as a month or more before egg-laying begins (Gates 1962, Duebbert 1966, Oring 1969). A similar interval occurred … WebAbstract: Island-nesting mallards (Anas platyrhynchos) and gadwalls (A. strepera) were studied on a 4.5-ha island in 385-ha Miller Lake in northwestern North Dakota during 1976-80. During the 5-year study, 2,561 duck nests of 9 species were found on Island A located 180 m offshore; 59% were mallard and 34% were gadwall. WebGadwall Eurasian Wigeon American Wigeon Mallard American Black Duck Mottled Duck Northern Pintail Green-winged Teal Canvasback Redhead Ring-necked Duck Greater … file head of household irs