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In BRB-1 and BRB-2, the mapping of High shrub density areas was NOT be followed up with <br />separate quantitative sampling. Shrub density data associated with the randomly placed cover <br />sampling transacts was collected, but no sampling centered on the High Density patches was <br />pursued in these areas. Such cover samples as happened to have fallen in High Shrub Density <br />patches of BRB-1 and BRB-2 were noted for descriptive purposes. <br />In BRB-3, quantitative density data from mapped shrub patch areas were gathered from belt <br />transacts located and oriented randomly within the individual shrub patches. Fifty samples were <br />located in the °High° density patches. The number of samples per patch were proportionally <br />based on the size of the patch. In the Background shrub density portions of BRB, an additional <br />approximately twenty sample points (beyond the thirty sampled in conjunction with cover and/or <br />production) were located and sampled for shrub density. The origin of the sample transact in the <br />High density patches was placed in the center of the patch, unless to have done so would have <br />prevented the belt transact sample area from staying within the patch boundaries. If more than <br />one sample point was placed in a patch, they were evenly (uniformly) spaced in the polygon. The <br />belt transacts (i.e. elongate sample plots) were 2 m x 50 m in dimension and randomly oriented <br />from the origin. Within each belt fransect, all living trees and full shrubs whose root crowns <br />emerge within the plot boundaries were counted by species. Sample adequacy of collected <br />shrub density data from the BRB-3 High density shrub patch sampling were determined as <br />follows: <br />(st)s <br />nmin = <br />where: <br />(dx)z <br />nm;,, =the number of sample points needed in a given vegetation type to be capable of detecting a <br />159'o reduction in the mean with 909'o confidence; <br />s =standard deviation (n-f ); <br />• 12 <br />