Laserfiche WebLink
<br />. <br /> <br />This study was initiated to evaluate larval razorback sucker drift characteristics and use <br /> <br />the resulting data to revise management of middle Green River flood plain wetlands. The <br /> <br />objectives for this study were to: <br /> <br />1 Evaluate larval drift and entrainment patterns downstream from Razorback Bar; <br /> <br />2 Evaluate drift and entrainment of larvae into flood plains from other potential spawning <br /> <br />. <br /> <br />. <br /> <br />sites; <br /> <br />3 Continue to evaluate the effectiveness of breach connections for entraining drift at <br /> <br />various flows over the spring hydro graph; and <br /> <br /> <br />4 Provide data to refine the Flood Plain Drift Model (Valdez and Nelson 2004) and to test <br /> <br /> <br />various flood plain management scenarios. <br /> <br /> <br />This study (2004 - 2006) built upon information collected in previous years regarding <br /> <br /> <br />patterns of reproduction, larval drift, and entrainment into flood plain wetlands. For example, <br /> <br />results from preliminary sampling in 2003 suggested that increasing entrainment of razorback <br /> <br />sucker larvae may be a complex process and that assessing drift patterns based on capture of wild <br /> <br />larvae may be inefficient (Appendix II). As a result, semi-buoyant beads and marked razorback <br /> <br />sucker larvae were used rather than wild larvae, to increase the number of particles available for <br /> <br />capture. Specifically, we sought to better understand: 1) the relationship between flow, bead, <br /> <br />and larvae entrainment rates into flood plain wetlands as a function of flow; 2) entrainment rate <br /> <br />variation during increasing or decreasing portions of the hydrograph; 3) breach connections and <br /> <br />configurations to enhance entrainment; 4) drift and behavior patterns of razorback sucker larvae <br /> <br />relative to beads; 5) the required proximity of larvae to the flood plain breaches in order for <br /> <br />entrainment to occur; and 6) whether a configuration exists that allows for entrainment, but does <br /> <br />not increase sedimentation into the flood plain habitats. This report presents the results of a <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />41 <br /> <br />. <br /> <br />16 <br /> <br />. <br />