Washington Gap Analysis Project's Predicted Distribution Map

Western Grebe (Aechmoporus occidentalis)
This is an "at risk" species

Range maps

Legend:
= 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.

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

Fact Sheets

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

This species is locally common on large ponds and reservoirs in arid areas of eastern Washington, especially Moses Lake and Potholes Reservoir in Grant County. This grebe is also known from ponds along Crab Creek and Frenchman Hills Waterway, in many ponds in the Columbia National Wildlife Refuge, and other locations including Lake Lenore and Banks Lake.

Good habitats in core areas of use were freshwater/wetlands in the Central Arid Steppe and Big Sage/Fescue zones.

Outside of the mapped distribution, Western Grebes may be found as non-breeding summer residents or migrants. During the nesting season this species is highly colonial. Colonies are formed as a few pairs nest among developing vegetation, followed by more pairs nesting as ‘satellites’, and so on until there are many pairs nesting in a fairly large colony. The nest is a floating vegetation mat anchored to developing vegetation. The ‘possible’ BBA records along the Columbia between Kittitas and Grant Counties are most likely of non-breeding individuals, since the river is deep, flanked by steep cliffs, and has little suitable emergent vegetation in the area.

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