Laserfiche WebLink
<br />~ <br /> <br />~ <br /> <br />ONGOING BUT EXPANDED <br /> <br />Titl e: <br /> <br />Flow effects on humpbacK chub populations in Westwater and Black <br />RocKs canyons <br /> <br />Scope of Work Number: E <br />Hypotheses: 9 <br />Tasks: 8 <br /> <br />Cooperating Agencies: Fish and Wildlife Service, Utah Division of Wildlife <br />Resources, Colorado Division of Wildife. <br /> <br />FY 93 Cost: $178,700 <br /> <br />Study Summary: This study will be conducted cooperatively by Utah Division <br />of Wildlife Resources (UDWR), Colorado Division of Wildlife (CDOW), U.S. <br />Fish and Wildlife Service (FWS), BIO/WEST, Inc., and larval Fish laboratory <br />(lFL) as part of the studies to assess the opportunities to re-regulate the <br />Aspinal Unit to benefit endangered fishes in the Gunnison and Colorado <br />rivers. The study focuses on the Westwater Canyon and Black Rocks <br />populations of humpbaCK chubs in the Colorado River 40 to 50 miles below the <br />Gunnison River confluence. It is designed to specifically address the <br />effect of high spring flows on successful reproduction and recruitment of <br />humpbaCK chub, as well as the effect of seasonal flow events on the <br />formation of critical habitat and the invasion/proliferation of non-native <br />species. The study will also assess the effects of flows on the invasion of <br />roundtail chubs into Westwater Canyon and Black Rocks and the potential <br />impact of hybridization. <br /> <br />NEW START <br /> <br />Title: <br /> <br />Quantification of available habitat in the Gunnison River in <br />relation to test flows released from the Aspinall Unit. <br /> <br />Scope of Work Number: F <br /> <br />Hypotheses: 6, 7, and 8 <br /> <br />Tasks: 9 <br /> <br />Cooperating Agencies: Fish and Wildlife Service and Bureau of Reclamation. <br /> <br />FY 93 Cost: $40,000 <br /> <br />Study Summary: Aerial videography will be combined with ground truthing to <br />describe the available habitats in the Gunnison River and their relationship <br />with streamflow. Color aerial videography will be acquired at peak flow and <br />again at base flow. Detailed habitat measurements will be made by <br />individuals on the ground at the same time as the aerial videography is <br />flown. The selected study sites will represent the general habitat <br />conditions found in the Gunnison River as well as specific sites known to be <br />important to Colorado squawfish and razorback sucker. Habitat types that <br /> <br />8 <br />