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I I I I I I I I I I I I I I I I I I I River stations comprised another set of similar stations as well as Jensen and Lily Park. During 1980, due primarily to increased diver- sity at Little Hole and Taylor Flats, no significant differences were found in mean species diversity between any stations. Annual Trends. Diversity values were also examined on a yearly basis. Mean diversity at all Green River stations decreased from 1978 to 1979 then increased to the maximum levels observed during the study in 1980. Single classification analysis of variance indicated that there were significant differences (P(.OI) in species diversity between 1978, 1979, and 1980 at Little Hole and Taylor Flats together. Wade and Curtis exhibited no significant differences between the three years but this was due primarily to large sample variation. Jensen and the Yampa River stations also exhibited no significant differences in species diversity between 1978 and 1980. Mean species diversity at Little Hole for each year of this study was also compared with mean values generated from abundance information collected by Pearson et al. (1968) for 1965 and 1967 by an a posteriori student-Newman-Keuls test. Results showed that mean diversity values at Little Hole were similar in 1965, 1967, 1978, and 1979. The mean diversity value for 1980, however, was significantly higher (P(.05). Fishes General Table 10 lists the fishes collected during this study by station and age class. Twenty-eight species and three hybrids were collected, including 11 native and 17 introduced species. Over 63,000 fish were -33-