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~ r <br />27 <br />In addition to the sampling of the seven sites on the Yampa, six sites were <br />selected and sampled identically on the Green, four above the confluence and two <br />below (Table 1). The sites selected above the confluence represented the <br />spectrum of physiographic types sampled on the Yampa, while those below the <br />confluence represented only a sandy beach and a sand bar. In most cases, the <br />transects were extended beyond the historic floodline and into the upland zone <br />or the relictual riparian zone, using the same criteria as on the Yampa. At <br />Compromise Campground an impenetrable stand of tamarisk prevented sampling of <br />the entire historic flood zone. <br />Tamarisk Seedling Establishment <br />In September, five of the sample sites on the Yampa River were revisited, <br />Tepee Rapids, Biq Joe Rapids, Mather's Hole, Caddie Park and Box Elder. Each of <br />these sites exhibited successful tamarisk seedling establishment on sandy <br />substrates. The sand bar at Tepee was approximately 200 yards above the gravel <br />island sampled in August and that at Mather's Hole was about 50 yards downstream <br />of the August sampling area. The others were all within the August sampling <br />sites. <br />At three of the sites, Tepee, Caddie Park and Box Elder, the seedlings were <br />found in distinct linear zones across a seemingly uniform sandy substrate. At <br />Big Joe, they were more widespread over the flood zone, but there were patches <br />of bare sand present. At Mather's Hole, the sample site was an eroding sand <br />deposit with a dense, uniform covering of tamarisk seedlings. <br />A single transect was run at each of these sites. Transects ran from the <br />water's edge to the floodline and relief was measured as in August. Tamarisk <br />seedling density was measured at each meter on the transect line in four <br />