6006

• UCREFRP Catalog Number: 6006
• Author: Holden, P. B. and L. W. Crist.
• Title: Documentation of Changes in the Macroinvertebrate and Fish Populations in the Green River Due to Inlet Modification of Flaming Gorge Dam
• USFW Year: 1981.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

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Cheumatopsyche sp. dominated summer and fall samples. Table 26,
Appendix II, lists many species found in this study and whether they
were most common in the regulated (Little Hole, Taylor Flats, and Wade
and Curtis) or unregulated (Lily Park, Boxelder Park, and Jensen) par....
tions of the Green and Yampa rivers.
Annual Trends. Little Hole and Taylor Flats exhibited differences
in abundance of certa in taxa between 1978 and 1980. Peak dens i ties of
Hydroptila sp. increased from 0 at Little Hole and Taylor Fld.ts in
1978 to 724/m2 and 886/m2, respectively, in 1980. Gammarus lacustris
exhibited peak abundances at Little Hole increasing from 452/m2 in
1978 to 3225/m2 in 1979 to 3992/m2 in 1980. Taylor Flats also had
increased peak populations of this species which ranged from 0/m2 in
1978 to 617/m2 in 1980. Yampa River stations showed no comparable
increase of these taxa during the same time period. Other taxa which
exhibited slight to moderate increases in abundance at these two sta-
t ions i nc 1 uded Ephemere 11 a i nermi s, Mal enka sp. , Hydropsyche, and
Planaria. Annual changes in abundance of individual taxa at Wade and
Curtis were difficult to assess due to the small numbers involved and
the large variation present.
Species Diversity
Spatial Trends. Shannon-Weaver species diversity values calcu-
lated for each sample period from 1978-1980 are presented in Table 8.
Figure 3 shows mean yearly diversity values for each station on the
Green River from 1978-1980.