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Last modified
7/14/2009 5:02:37 PM
Creation date
5/22/2009 4:40:09 PM
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UCREFRP
UCREFRP Catalog Number
9641
Author
Hedrick, T. N., K. R. Bestgen and K. D. Christopherson.
Title
Entrainment of Semi-Buoyant Beads and Razorback Sucker, Xyrauchen texanus, Larvae into Flood Plain Wetlands of the Middle Green River, Utah.
USFW Year
2009.
USFW - Doc Type
C-6/RZ-ENTR,
Copyright Material
NO
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<br />. <br /> <br />Stirrup wetland were during the last release, likely because the wetland was full. We can not <br /> <br />explain why no beads were captured during the second release when some water was entrained, <br /> <br />and why a few beads (74) were captured on the third release when nearly no water was entrained. <br /> <br />The Stirrup wetland is downstream of the zone where orange and yellow beads have <br /> <br />mixed across the channel. As a result, yellow and orange beads were collected in relatively even <br /> <br />numbers on both the ascending and descending limb of the hydro graph (Tables 2, 3, and 4). No <br /> <br />beads were collected in the breach at peak Green River flows. The percentage of flow entrained <br /> <br />and the percentage of beads entrained also mirror one another, similar to the relationship <br /> <br />observed at the other flood plain breaches. Numbers of beads captured in the near shore nets <br /> <br />remained relatively constant from the first release to the last. <br /> <br />Based on the number of beads collected at all sites and in all locations (breach, near <br /> <br />shore, mid-channel, far shore), it appears that the Stirrup was not sampled at the time when most <br /> <br />beads were passing the site. More beads were collected downstream at the Leota site, suggesting <br /> <br />that sampling time at the Stirrup was either too early or too late. Thus, we believe data collected <br /> <br />at this site are flawed. Sampling at the proper time would likely have resulted in entrainment <br /> <br />patterns for water and beads that were similar to other wetland sites with single openings. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Leota 7, 2005 <br /> <br />The L- 7 wetland entrained relatively little water and captured few beads during 2005 <br /> <br />sampling (Table 8, Figure 15). This was due, in part, to the greater distance downstream from <br /> <br />the release site and subsequent lower bead density as the beads, concentrated at release, spread <br /> <br />out. More importantly, L-7 had only a single connection during our sampling and water was not <br /> <br />flowing into the wetland during the first sampling occasion, and was draining during the third <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />41 <br /> <br />. <br />
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