Western Bluebird
Western Bluebird (Sialia mexicana)
Habitat: Prairie, Oak Savannah, or Open Woodland
Habitat Attribute: Cavities in trees with open access and low-saturated herbaceous vegetation
Population Objectives (Ecoregions)
Puget Lowlands:
- By 2030, increase the current estimated population of 850 birds by ≥40.8% to ≥1,197 birds (3.5% annual exponential growth rate), with ≥599 birds in ≥38 subpopulations, and another ≥599 birds elsewhere throughout the ecoregion.
Habitat Objectives (Ecoregions)
Puget Lowlands:
- By 2030, maintain ≥38 suitable habitat areas as described below that include ≤ 2,375 ha (5,869 ac) with ≥70% habitat suitability/patch.
Population and Habitat Objectives (Subregions)
Puget Lowlands:
Size, Number, and Distribution of Subpopulations and Habitat Areas by 2030:
- ≥1 large subpopulations (i.e., ≥25 pairs) in <106 ha (263 ac)/subpopulation
- ≥4 medium subpopulations (i.e., 15-25 pairs) in <76 ha (188 ac)/subpopulation
- ≥8 small subpopulations (i.e., 5-15 pairs) in <46 ha (113 ac)/subpopulation
- ≥11 of the small habitat areas, ≥6 of the medium habitat areas, and ≥3 of the large habitat areas should have ≥90% of the area in secure conservation status (i.e., ownership or easements) and being managed in ways compatible with suitable habitat
- ≤10% of the subpopulation habitat area should be hostile habitat (i.e., urban, residential, high density rural)
Population Objectives (Sites)
Target Densities in Suitable Habitat:
Puget Lowlands:
- North: >0.01 birds/ha (>0.004 birds/ac)
- South: >0.04 birds/ha (>0.02 birds/ac)
Willamette Valley:
- North: >0.01 birds/ha (>0.004 birds/ac)
- South: >0.04 birds/ha (>0.02 birds/ac)
Klamath Mountains:
- Umpqua: >0.03 birds/ha (>0.01 birds/ac)
- Rogue: >0.05 birds/ha (>0.02 birds/ac)
Habitat Objectives (Sites)
Prairie, Oak Savannah, or Open Woodland in the following conditions:
- canopy cover <35%
- shrub cover <15%
- ground cover dominated by grasses <30 cm (12 in) in height
- mean tree DBH >38 cm (15 in)
- >20% of the trees >53 cm (21 in) DBH
Cited Plan
