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Alluvial reaches of the Colorado River near Grand Junction, Colorado, provide important habitat for the endangered Colorado squawfish (Ptychocheilus lucius) and razorback sucker (Xyrauchen texanus). Populations of these native fishes have declined dramatically in the past several decades, a situation that is often attributed to the hydrological and ecological effects of upstream reservoir operations. This report summarizes research done over the last five years to evaluate the importance of historical changes in streamflow and sediment loads on alluvial reaches of the Colorado River near Grand Junction. In addition, we describe recent changes in the geomorphology of the Colorado River and address the question of...
ABSTRACT.-We compared diet of young-or-year Colorado squawfish (Ptychocheilus lucius), an endangered cyprinid, with diets of other fish <75 mm total length (TL) collected from backwaters of the Green River between river kilometers 555 and 35 during summer and autumn 1987. Species included native Rhinichthys osculus, Catostomus discoholus, and C. latipinnis, and nonnative Cyprinella lutrensis, Notrupis stramineus, Pit"l1&'Phales promelas, Ictalurus punctatus, and upamis cyanelll1s. For (;, species, diet varied with size and between upper and lower river reaches but not between seasons for Hsh of similar size. Larval chironomids and ccratopogonids were principal foods of most fishes. Copepods and cladocerans...