9614

• UCREFRP Catalog Number: 9614
• Author: Bowen, Z. H. and e. al.
• Title: Habitat Measurement and Modeling in the Green and Yampa Rivers.
• USFW Year: 2001.
• USFW - Doc Type: \
• Copyright Material: NO

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Developing habitat time-series
Habitat mapping and time-series development focused on two potential
reproductive bottlenecks for successful reproduction and recruitment of razorback sucker;
habitat conditions at the spawning bars in the Green and Yampa Rivers during runoff and
subsequent availability of floodplain habitat downstream from the Green River spawning
bar. These potential bottlenecks were evaluated by examining: (1) habitat time series for
the runoff hydroperiod during water years 2000 and 1984 for both study areas and (2) the
availability of floodplain habitat downstream from the Green River site near Ouray, UT.
Output from hydraulic simulations was classified based on habitat class definitions
(Table 2) to develop maps of habitat for the range of flows simulated. Spawning habitat
Table 2. Habitat classes used in habitat mapping and time series development. Class 22
was broadly defined based on measurements of depth and velocity associated with
spawning razorback suckers in the middle Green River (Tyus and Karp 1990). First digit
in class code increases with increasing depth and second digit increases with increasing
velocity.
Depth range Velocity range Habitat class
0.0-0.5 0.0-0.4 11
0.4-0.8 12
0.8 to 1.2 13
>1.5 14
0.5-1.0 0.0-0.4 21
0.4-0.8 22
0.8 to 1.2 23
>1.5 24
1.0-1.5 0.0-0.4 31
0.4-0.8 32
0.8 to 1.2 33
>1.5 34
>1.5 0.0-0.4 41
0.4-0.8 42
0.8 to 1.2 43
>1.5 44