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Last modified
8/11/2009 11:32:56 AM
Creation date
8/10/2009 4:03:57 PM
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UCREFRP
UCREFRP Catalog Number
7797
Author
Collins, K.
Title
Conceptual Management Plan for Razorback Sucker Habitat Enhancement in Flooded Bottomlands Scott M. Matheson Wetland Preserve Moab, Utah.
USFW Year
1994.
Copyright Material
NO
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<br />mainstream Colorado River upstream of the Green River confluence <br />and includes its major tributaries, the Dolores and Gunnison <br />Rivers. The USFWS listed the razorback sucker as an endangered <br />species in 1992. Currently, the razorback sucker population is <br />comprised of mostly older adults. No juveniles have been found <br />in the Upper Colorado Sub-basin since the early 1960s when eight <br />specimens of 90 to 115 mm were collected between Moab and Dead <br />horse Point, Utah (Taba et al. 1965). The lack of successful <br />recruitment is a major limiting factor for razorback sucker <br />populations. <br />Razorback suckers spawn on gravel bars as spring runoff is <br />increasing (Tyus and Karp 1990). Larvae drift downstream (Marsh <br />and Minckley 1989; Minckley et al. 1991) but little is known <br />about the habitats which juveniles occupy. Juveniles have been <br />found in backwaters in the Upper Colorado River Basin (Taba et <br />al. 1965; Gutermuth et al., in press) and adults are known to <br />occupy quiet eddies and pools (Miller et al. 1982). <br />Open water wetlands in flooded bottomlands are believed to be <br />significant nursery habitats for razorback suckers. Potentially, <br />larvae drift into flooded bottomland habitats with the rising <br />water of high spring flows. Based on research of all the <br />endangered Colorado River fish species and a study of flooded <br />bottomlands in the Upper Colorado River Basin (Cooper 1994, <br />included in Appendix A), the characteristics of the Preserve that <br />are likely to be beneficial-to razorback larvae include the <br />following: <br />Warm waters (...°F)??, (how deep??...). <br />Low turbidity, neutral pH. <br />Adequate DO levels through winter (how high??...). <br />Wetlands with high densities of water column Clodocera <br />and Copepoda and a productive benthic community <br />dominated by Chironomids. <br />Vegetation structure for invertebrate production and <br />cover for larvae. <br />Overbank flows of 5 - 20 days in duration which allow <br />razorback sucker larvae and juveniles access to and <br />egress from nursery habitat. <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Open water within the Preserve of sufficient depth and ' <br />quality to allow overwinter survival of razorback <br />suckers. <br />Permanent water source to maintain wetland habitat <br />between periods of overbank flow. <br />2 <br /> <br /> <br />
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