Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects. Page: 36 of 115
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along the transect line. The pole is held vertical and plumb while an observer estimates
percent obscurity for each .5 m pole increment from four directions (two parallel and two
perpendicular to the transect azimuth) from a distance of 15 m. Both vegetation and
landscape features (rocks, depressions, stumps etc.) provide hiding cover and are assumed
to be of equal value. Each .5 m increment is equal to 33.3% of the total value (100%).
Percent obscurity for each point is determined by estimating the percent obscurity for each
of the three .5 m increments from four directions and then averaging the values for each
increment. The cover value for each transect point is equal to the mean of the three .5 m
increments. Percent obscurity for the transect is determined by calculating a mean from the
values obtained at each point along the transect.
Micro Plot square (Daubenmire 1959)
This is a . im2 metal rectangular frame delineated into smaller rectangles and is used to
estimate the percentage of vegetative cover within the frame's boundary. Legs were
attached at the four comers to raise the frame 10 cm above the ground. Vegetation cover
percentages were taken at points 4 m from the transect line perpendicular to the transect
azimuth. The microplot square was placed to the left of the line at every sample point.
Measurements were then averaged to provide mean percent grass and forb ground cover.
Running Mean
This sampling procedure utilizes an averaging method to avoid over or under sampling a
cover type. A "decision tree" (Appendix E) was developed to assist in determining when
enough samples were taken during a particular transect. This procedure was utilized in
conjunction with the Robel pole and microplot square..30
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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/m1/36/?rotate=90: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.