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<br /> Table 3 ,~nthropo ¢enic changes to riverine environments of the CRB effects and impacts to native fishes <br /> Perturbation Effect Impacts to native fishes <br /> Dam construction -Colder thermal -Prohibits successful spawning <br />' and reservoir regime -Reduces swimming performance <br /> impoundmerrt -Reduces growth of warmwater native fishes <br />' Reservoir storage of -Altered flow regime -Habitat alteration <br /> water, irrigation -Limits sediment transport, increasing water <br /> diversion, trans-basin clarity and potential predator impact, and limiting <br />' exports maintenance of spawning areas <br /> Trapping of sediment -Reduced sediment -Habitat alteration <br /> behind dams transport -Increases water clarity and potential predator impact <br />' Dams, reservoirs, -Habitat fragmentation, -Eliminates dispersal pathways, blocks migration <br /> roads, grazing, urban destruction routes <br /> development <br /> Non-native fish -Increasedpredation -Increases mortality of potentially all life-history fish <br /> introductions -Increased competition stages, particularly larvae and juveniles <br /> -Introduction of non- -Indirect food-web effects <br /> native fish pathogens -Increased parasitism of native fish species <br /> Mining, agriculture, -Reduced water quality -Direct and indirect effects on growth and survival <br /> sewage treatment, <br /> irri ati n <br />Ongoing recovery efforts to restore populations of Colorado pikeminnow, razorback <br />sucker, humpback chub, and bonytail seek to identify and correct factors limiting critical <br />life-history stages. Unfortunately, status and ecology of the roundtail chub, flannelmouth <br />i sucker, and bluehead sucker remain comparatively unstudied, so limiting factors are <br />poorly understood. <br />1 <br /> <br /> <br /> <br /> <br />1 Final Report September 2002 9 <br /> <br />