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<br />002153 <br /> <br />11 <br /> <br />3. Inter-relationship between mainstem and tributary sediment and flows, with <br />particular emphasis on inputs from the Little Colorado and Paria Rivers, and physical <br />impacts of tributary debris flows on mainstem geomorphology and related resources <br />and processes. <br /> <br />4. Influences of dam releases and natural tributary inflows on mainstem hydrology and <br />sediment transport . <br /> <br />The Biological Resources Program <br /> <br />Monitoring and research rehting to biological resources is intended to refine and further <br /> <br />develop information about the str,,>;rure and function of the Colorado River ecosystem in relation <br /> <br />to dam operations. Linkages between the biological resources program and the physical <br /> <br />resources program should be made to facilitate the understanding of the influence of abiotic <br /> <br />factors on biotic resources (e.g., discharge and sediment on fish habitat). <br /> <br />.; Monitoring and research efforts will address the following areas: <br />1. Aquatic food base. <br /> <br />Programs will define the current and historic food base characteristics and <br />structure as related to natural variation and to dam operations; evaluate if the aquatic <br />food base is limiting in the Glen canyon reach; and examine how large fluctuations <br />associated with dam operations affect the aquatic food base and associated native and <br />non-native fish populations. <br /> <br />2. Native fish populations. <br /> <br />Programs will evaluate native and non-native fish population dynamics, growth, <br />survivorship, recruitment, habitat, health, and changes in population structure, to <br />assess these communities' responses to alternative dam operations. Native fish <br />species of concern are the humpback chub and flannelmouth sucker. <br /> <br />3. Lees Ferry Trout Fishery. <br /> <br />Monitoring of the non-native trout fishery in the Lees Ferry reach will concentr:',:e <br />on growth, survivorship, recruitment, habitat, health, and changes in population <br />structure, including the contribution from natural reproduction over time and angler <br /> <br />Final Draft - (12/15/97) For AMWG Review <br />