Abstract
Habitat use and associations of native and nonnative fish species in secondary channels of the San Juan River, New Mexico and Utah were investigated. Most species and age classes within species (larvae, juveniles, subadults, and adults) used low velocity habitats with silt substrata. Discriminant function analysis revealed broad overlap in habitat use among species, with a trend of older age classes occurring in deeper habitats with faster current velocities. Overall, discriminant function analysis was able to correctly classify species and age classes, based on habitat use, 23.4% of the time. Native juvenile fishes exhibited the greatest interspecific association with nonnative fishes, whereas adult and subadult native fishes showed the least. Depending on the availability of resources, overlap in habitat use may result in negative interactions among native and nonnative fishes.
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