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GAP Analysis Predicted Distribution Map

Gadwall (Anas strepera)

Species Code: ANST

Click to enlarge Range map

= Core Habitat
= Marginal Habitat

Breeding Range Map
The green area shows the predicted habitats for breeding only. The habitats were identified using 1991 satellite imagery, Breeding Bird Atlas (BBA), other datasets and experts throughout the state, as part of the Washington Gap Analysis Project. Habitats used during non-breeding months and migratory rest-stops were not mapped.

Metadata (Data about data or how the map was made)

Click to enlarge distribution map

Other maps & Information:
  • Breeding Bird Atlas
  • NatureMapping observations
    during breeding season
  • NatureMapping observations
    throughout the year

This species is common in the lowland freshwater bodies and wetlands of eastern Washington, especially in the Columbia basin. In western Washington the Gadwall is locally common in the appropriate habitat (described below) near urban/suburban areas of the southern Puget Trough roughly from Mount Vernon to Olympia such as King County and along the Columbia River.

In eastern Washington, open freshwater in steppe zones were core areas of use, and grassland and shrubland in Ponderosa Pine were peripheral areas of use. In western Washington, Gadwalls are often associated with developed and cleared areas, and low-to mid-density developed areas, agriculture and clearings were included knowing there may be smaller pockets of habitat suitable for them. Despite the large amount of wetlands available in western Washington, Gadwalls show a distinct preference for urbanized areas in the southern Puget Trough and rarely breed anywhere else.

Translated from the Washington Gap Analysis Bird Volume by Uchenna Bright
Text edited by Gussie Litwer
Webpage designed by Dave Lester