9668

• UCREFRP Catalog Number: 9668
• Author: Crowl, T. A. and e. al.
• Title: Bonytail Draft 1998 Annual Report, February 2000.
• USFW Year: 2000.
• USFW - Doc Type: Logan, UT.
• Copyright Material: NO

were present, variation was higher than controls for low and medium velocity but not
different at the highest velocity.
Depth Selection In Flow Experiments With Red Shiners
Depth selection was interdependent with time of observation as determined by an R X
C test in low velocity treatments (x2=29.02, df=1, _p<0.001). During night observations
bonytail selected for deep depths 91%, 94%, 70%; middle depths 9%, 6%, 22%; and
shallow depths 0%, 0%, 8% for low, medium, and high velocity treatments respectively
(Fig. 1.7).
100 GLOW VELOCITY
................ MEDIUM VELOCITY
80 MHIGH VELOCITY
W s .................................................
60 ,
W
-- ----- -- .........
(n
40
0 r
0 20

0
DEEP MID SURFACE
Figur DEPTH e 1.7
Dept h
selection by bonytail in flow experiments without substrate and with red shiners present
(nighttime only).
During day observations bonytail selected for deep depths 99.6%, 95%, 72%; middle
depths 0.4%, 5%, 16%; and shallow depths 0%, 0%, 12% for low, medium, and high
velocity treatments respectively (Fig. 8).
22