Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects. Page: 43 of 115
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Yellow Warbler/Mink
Yellow warbler and mink habitat was rated poor to marginal at all study sites due to limited
deciduous shrub crown cover, low percent of hydrophytic shrubs within the over-all shrub
canopy, and the lack of suitable over-story canopy closure.
The absence of deciduous/hydrophytic shrubs within the riparian shrub cover type was the
primary limiting factor for yellow warblers. In the few shrub dominated riparian areas,
yellow warbler HSIs were low because hydrophytic shrubs were not present and/or shrub
structure was not suitable i.e., shrubs were less than 6 feet tall or greater than 16 feet in
height,
Mink habitat lacked diverse understory, which supports the minks prey base, as well as
overstory hiding cover at all study areas. In addition, the absence of year round surface
water on the Berg Brothers site further reduced the HSI on that project area.
HEP baseline HSIs and HUs are depicted in Table 7. Projected HSIs and HUs are
described in Appendix F.
Table 7: Yellow Warbler and Mink Baseline HEP Survey Results.
PROJECT COVERTYPE ACRES HEP MODEL BASELINE HSI BASELINE
AREA HUs
Scotch Ripanan Shrub 48 Yellow Warbler 0 0
Creek
Chesaw Riparian shrub 25 Yellow Warbler .4 10
Emergent Wetland 80 Mink .2 16
Tunk Riparian shrub 14 Yellow Warbler .3 4
Pogue Riparian shrub 11 Yellow Warbler .2 2
Mountain
Emergent Wetland 21 Mink .1 2
Berg Deciduous 32 YellowWarbler .4 13
Brothers Woodland
Riparian 41 Mink .2 837
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Ashley, Paul R. Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects., report, January 1, 1997; Olympia, Washington. (https://digital.library.unt.edu/ark:/67531/metadc703292/m1/43/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.