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<br />4' <br /> <br /> <br />/\/U <br /> <br />IN REPLY REFER TO: <br /> <br />MAILING ADDRESS: <br /> <br />PQflt Office Bo~ 25486 <br />Dt"~r F~ral CentLr <br />Dtnwr, CokJrtUJo 80125 <br /> <br />STREET LOCATION: <br /> <br />,,~~ WJ22S <br />J\\~ '2. t) 'C3(} <br />~"1ER <br />oQl.O~...'f\ON <br />1990 ~P.RO <br /> <br /> <br />United States Department of the Interior <br />FISH AND WILDLIFE SERVICE <br /> <br />JUN19 <br /> <br />DIR ./ <br />SC V <br />ASC <br />F <br />, <br />L <br />e <br /> <br />FWE/SE/Upper Colorado <br />River Basin <br />Mail Stop 60153 <br /> <br />Memorandum <br /> <br />To: Management Group and Consultants <br />Technical Group and Consultants/Interested Parties <br />Bio/Rag <br />Recovery Team and Consultants <br />Tom Chart <br />Lee Carlson <br />Ned Andrews <br />Jim O'Brien <br />Wayne Hubert <br />-1'" <br />From: ~(~ASsistant Regional Director, Fish and Wildlife Enhancement, Region 6 <br /> <br />Subject: Compendium of Existing Knowledge for use in Making Habitat Management <br />Recommendations for the Upper Colorado River Basin <br /> <br />Attached please find a copy of the compendium. Begun in 1989, the project <br />involved compilation of "key" information pertaining to rare fish species' <br />needs as compared to past, present, and future environmental conditions. The <br />rare fishes of the Upper Colorado River Basin have certain physical, chemical, <br />and biological habitat needs which apparently are not being met in certain <br />areas. The thinking was that if we could identify and quantify those needs, <br />then we would be better able to provide for them to recover the fishes. "Key" <br />information was considered to be that which could be translated into activities <br />which would help to recover the fishes, or which could be used to assess <br />impacts of existing or proposed actions likely to affect the fishes. <br /> <br />The compendium is divided into categories of variables thought to be important <br />to riverine fishes. For each variable, information was sought to define the <br />ranges of values which are beneficial vs. those which are detrimental to the <br />species. Armed with such information, one should be able to assess the <br />relative suitability of habitat at a given locale, assess or predict impacts of <br />proposed projects, and identify research needs to address missing information. <br />There are, no doubt, important variables (and interactions among variables) <br />that have been overlooked and are necessary to develop a complete picture. <br />Any thoughts you may have on important controlling variables and/or limiting <br />factors would be appreciated. <br /> <br />,1\ <br />, , <br />