9484

• UCREFRP Catalog Number: 9484
• Author: Osmundson, D. B., V. L. Ryel, V. L. Lamarra and J. Pitlick
• Title: Flow-Sediment-Biota Relations
• USFW Year: 2002
• USFW - Doc Type: Implications for River Regulation Effects on Native Fish Abundance
• Copyright Material: YES

December 2002 FLOW-SEDIMENT EFFECTS ON RIVERINE FISH
25
20
E
0)
E 15
M
_ 10
Q
O
O 5
U
0
N 8
C
m 7
6
E 5
4
N 3
N
2
N
> 1
C: 0
60
N
50
40
E
30
U
j 20
0 10
0
6
C 5
E
4
O 3
f0
L 2
U
l6
U 1
0
a
-Runs
Riffles
C _ Runs
Riffles
}
d
- All fish
--100-300 mm
- roundtail chub

4
3.5
E 3
2.5
N 2
cu
O 1.5
3 1
Q
tN
U 0.5
0
4.5
4
E 3.5
3
2.5
N 2
1.5
CU 1
U 0.5
0
105
2 100
95
90
O
85
O
ED 80
Z e, Flannelmouth sucker
75
5
4
3
N
E 2
O
-Runs
Riffles
f
Bluehead sucker
-Runs
Riffles
1
0
1729
1 2 3 4 5 6 7 8 91011 1 2 3 4 5 6 7 8 9 1011
Stratum Stratum
FIG. 3. Longitudinal pattern of biological parameters by study stratum: (a) chlorophyll a concentration on riffle and run
cobbles; (b) dry mass of invertebrates in riffle and run substrates; (c) accumulated coarse particulate organic matter (detritus)
in riffles and runs; (d) electrofishing catch-per-effort (CPE) of all fish (except pikeminnow), fish 100-300 mm long (potential
pikeminnow forage), and native roundtait chub; (e) electrofishing CPE of native flannelmouth sucker by habitat type; (f)
electrofishing CPE for native bluehead sucker by habitat type; (g) body condition index (K,) of flannelmouth (FM) sucker,
bluehead (BH) sucker, and roundtail (RT) chub; (h) estimated densities of adult Colorado pikeminnow ?550 mm TL. Values
plotted are means ± 1 SE.